# Physics

### Featured Answers

### Introduction to Physics

- What is Physics?
- Measurement and Units
- Unit Conversion
- Displacement and Velocity
- Acceleration
- Falling Objects
- Motion Graphs
- Introduction to Vectors
- Vector Operations
- Projectile Motion
- Relative Motion
- Defining Force
- Newton's First Law
- Newton's Second Law
- Newton's Third Law
- Frictional Forces
- Work
- Energy
- Conservation of Energy
- Power
- Simple Machines
- Momentum and Impulse
- Conservation of Momentum
- Elastic Collisions
- Inelastic Collisions
- Circular Motion
- Newton's Law of Gravitation
- Kepler's Laws
- Torque
- Moment of Inertia
- Angular Momentum
- Rotational Dynamics
- Static Equilibrium
- Bouyant Forces
- Pressure
- Fluid Flow
- Gas Laws
- Temperature and Thermal Equilibrium
- Defining Heat
- Specific Heat
- Latent Heat
- Thermal Expansion
- Heat and Work
- First Law of Thermodynamics
- Second Law of Thermodynamics
- Stefan's Law
- Ideal Gas Law and Kinetic Theory
- Simple Harmonic Motion - Springs
- Simple Harmonic Motion - Pendulums
- Wave Properties
- Wave Interactions
- Resonance and Standing Waves
- Sound waves
- Sound Intensity
- Harmonics
- Physics of Music
- Doppler Effect and Shock Wave
- Properties of Light
- Flat Mirrors
- Curved Mirrors
- Color and Polarization
- Refractions
- Thin Lenses
- Total Internal Reflection
- Advanced Optics Applications
- Interference
- Diffractions
- Lasers
- Electric Charge
- Electric Force
- The Electric Field
- Electric Potential
- Capacitance
- Current and Resistance
- Electric Power
- Static Electricity
- Coulomb's Law
- Circuit Diagrams
- Resistors in Series and Parallel
- Complex Resistor Combinations
- Capacitors in Series and Parallel
- Combination Capacitor Circuits
- RC (Resistor and Capacitor) Circuits
- Magnets and Magnet Fields
- Magnetism from Electricity
- Magnetic Force
- Electricity from Magnetism
- Generators and Motors
- AC Circuits
- Electromagnetic Waves
- Quantization of Energy
- Models of the Atom
- Quantum Mechanics
- The Nucleus
- Nuclear Decay
- Nuclear Reactions
- Particle Physics
- What is the diference between law of gravitation and universal law of gravitation?
- A man wishes to find out how down the water level is in the iron pipe leading into the well. He hums musical sounds at the mouth of the pipe , he notice that the lowest-frequency resonance is 94HZ. How from the top of the pipe is the water level?
- A balloon filled with a lighter gas occupies a volume of 1500 cu metre. Its mass (mass of material of balloon + mass of gas in it) is 1650 kg. Its tied with a rope and floating in air of density 1.3 kg/cubic metre. The pull on the rope is ?
- A wave source of frequency 1000Hz radiate wave of wavelength 0.10m.the time taken to travel 2500m is?
- What is the difference between t = 0 and t = 1 seconds?
- Two strings stretched by 5 cm and 10 cm respectively Ven masses 0.5 kg and 1kg are suspended at the lower abs when display slightly from the mean position and least they will oscillate with time period in the ratio?
- What is the graph obtained when a body is thrown in upward direction with velocity on y-axis and position of body on x-axis? Also,can you please explain how it is obtained?
- Dimensional analysis doubt!!!??
- Why do most leaves appear green to the human eye?
- What will be the anser?
- A force of 3kgf is just sufficient to pull a block of 5kgf .Find the coefficient of friction and angle of Friction?
- Can someone solve these questions?( Melting and boiling chapter)
- Why the light ray bend towards the normal when it enters from rarer to denser medium and vice versa?
- The angle made by resultant vector R=2underroot3i-2j with x axis is?
- What is the ability to do work called?
- If a track is 1.7 m long and has a height change, Deltah, of 20 ± 0.2 cm, what is the acceleration of a frictionless cart sliding down the track, with uncertainty?
- Can someone solve question iv? (its the top one)
- Is static friction a reaction force?
- Two bodies. X and Y of mass m and M respectively exert forces on each other and no other forces act on them. The force on X is F and the acceleration is a. Which of the following pairs is correct?
- If kinetic energy of electron is double then its radius becomes?
- A ball of moist clay falls 15.0m to the ground. It is in contact with the ground for 20ms before stopping?
- A 70 g ball B dropped from a height #h_o = 9m# and reaches a height #h_2 = 0.25m# after bouncing twice from identical 210 g plates. Plate A rests directly on the hard ground, while plate C, rests on a foam - rubber mat. Determine?
- What is a harmonic oscillator for which the frequency is not constant?
- Is it acceptable to think of the whole EM spectrum as simply being light in different forms? From harmless(radio wave) to visible(visible light) to harmful(#gamma #- ray)
- A point source is placed at a distance of 30cm from a convex lens (f=15cm). A glass slab of thickness 1cm is kept just in the opposite side of the lens. The refractive index of glass is 1.5. what will be image distance from lens?
- To stimulate a roller coaster, a cart is placed at the height of 4 m and allowed to roll from rest to the bottom. Find each of the following for the cart if friction can be ignored: a) the speed at the height of 1 m, b) the height when the speed is 3 m/s?
- Two forces A and B have magnitude of 15N and 21N respectively. The resultant of the two forces is R. If the angle between A and R is 45°, Find (I)the angle between A and B ? (II)the magnitude of R ?
- A 6-N falling object encounters 6 N of air resistance. What is the magnitude of the net force on the object?
- Two point charges with charges of #8.4xx10^-6# are brought close to each other. (a). Sketch this and show the direction of the electric force? (b) If the point charge on the left feels a force of #0.66N,# calculate the distance, #r,# between them?
- Two forces whose resultant is 200N are perpendicular to each other. If one of them makes an angle of 60° with the resultant. Calculate it magnitude?
- What is the name of the laboratory instrument for measuring the wave length of some radiation ?
- Two Train speeds?
- Frequency modulation is best achieved at what stage in a transmitter?
- A man walks 2 km east and then 4 km at 60° north of east. What is the magnitude and direction of the resultant displacement?
- The acceleration between time t and distance x is t=ax^2+bx where a and b areconstants.the acceleration is?
- A particle is projected at a definite angle #alpha# to the horizontal passes through the points #(a,b)# and #(b,a)#, referred to horizontal and vertical axes through the point of projection?
- A bullet hits a solid target lying on a frictionless surface and gets embeded in it.what is conserved(kinetic energy, momentum,both or none)?
- Electron,proton, neutron and alpha particle have same momentum which particle has more kinetic energy?
- When air at 300k and 1 atm pressure is compressed to one.twentieth of its original volume and 30 atm pressure the new temperature will be?
- What are the three laws of thermodynamics?
- An object weighing 80N on surface of earth will weigh 20N at how much distance from the center of earth?
- Why can no machine be 100% efficient?
- A force 6i+3j+k displaces an object from A(0,3,2) to B(5,1,6) what is the work done?
- The sum of two vector A and B is 5i+j and their difference is 3i-2j the vector then is?
- Object displays from 5 metre height reaches at a ground distance of 10 metre what is the final velocity?
- Check dimensional consistency of the equation:- F S=1/2mv^2-1/2mu^2?
- Work done is zero if an object moves with constant velocity? right?
- When 0.5 kg of aluminum is heated using a 1.5kw heater, the mass of aluminum changes completely into a liquid in 2.1 minutes. During this time its temperature remains constant at 660 Celsius. What is the specific latent heat of fusion of aluminum?
- Light and heavy objects have equal kinetic energy.which one has greater momentum?
- A proton with velocity v completes a circle with radius r in uniform magnetic field.what should be the velocity of alpha particle so that it completes a circle with same radius under the influence of the same magnetic field?
- A boat pushes off from a pontoon and travels 5m/s East while the pontoon floats away at 2m/s south. Calculate the velocity of the boat relative to the pontoon????? .
- If a projectile is projected with kinetic energy.having maximum possible horizontal range.then what will be it's kinetic energy at highest point?
- Anybody know the answer?
- You hold your hand 3 feet above the ground and look at the shadiw cast by the sun. You repeat this inside using the light from a 2-foot by 4-foot fluorescent light boxin the ceiling. In which case will the penumbra be more pronounced?
- The rotational inertia of a disk about its axis is 0.70kgm2. When a 2kg mass is added to its rim ,0.40m what will be its rotational inertia?
- A particle is moving in a straight line.its displacement at time t is given by s (in m) =-4t^2+2t,then its velocity and acceleration at time t=1/2 second are..???
- A kid is trying to solve a problem and he has: #(13m/s^2*12m/s*21 kg)/(2000 A)=# State his answer with one unit?
- Show the simplification from #(8.31 "LKPa")/("molK"# to #(8.31 "J")/("molK")#?
- State the units for intensity using only fundamental units? (Hint: work from #W/(m^2)#)
- 1kg m^2 s^-2 is equal to? a)10^2gm cm^2 s^-2 b) 10^5gm cm^2 s^-2. c) 10^7gm cm^2 s^-2. D)10^9gm cm^2 s^-2
- A 100g object is falling freely under gravity in absence of friction what will be the net force on it after 2 seconds?
- A yo-yo is made of 3 disks (same material) and the inner one is 3times smaller than the two outer ones (R/r=3). A string (small thickness) is wrapped around the center disk. What will its acceleration be equal to?
- In the given figure initially spring is in its natural length and system is released from rest. Finally block again comes to rest at mean position due to air resistance. Find the total work done by?
- A body is moved through a distance of 500m by a force of 20N. If the power developed is 0.40Kw. Calculate the time for which the force acts?
- A photon of wavelength 100mm acts as a mass of? My text book gives the answer 2.21×10^-41. but a photon can't have mass because when an object travels with speed of light it's mass becomes infinite.
- If a solid will break under pressure greater than #13atm# and that solid has specific gravity of 4, what is maximum height of a circular column made from the solid that can be built at the earth's surface?( Note: #1atm = 10^5 Pa#), #g = 10m/s^2#
- If a parachutist free falls, assuming he reaches terminal velocity, what is the force with which he hits the ground if he fails to open parachute?
- When the length of simple pendulum is dubuled ; find the ratio of new frequency to old frequency?
- A 1.0x10^5 N truck moving at a velocity of 15 m/s north collides head-on with a 1.0x10^4 N car moving at a velocity of 25 m/s south. If they stick together upon impact, what is the velocity of the combined masses?
- What is the net force if you push a cart to the right with 5N of force and a friend pushes the cart to the left with 5N of force?
- The ratio of electric force betweem 2 electrons to the gravotational force between them is of the order of?
- On a surface I have two point charges Qa and Qb, 1C and 4C respectivly and are placed at A(-3,0) B(3,0). Find all the points (locus) (except those that are too far away) where V=0.?
- How to find the velocity of two objects moving apart at relativistic speeds?
- What is the option?
- What will be the answer?
- 200 joule of energy is supplied to machine which is 40% efficient amount of energy lost is?
- Kinetic energy of body is increased by 300 % momentum of body is increased by?
- If a steel cable holding a cable car has stress xkpa. If four more cables are attached to the car,what is the stress on each cable?1) x/4. 2)x/5 3)x/3
- The value of capacitance of an capacitor is 8uf.Two blocks of identical size and dielectric constants k1=3.0 and k2=6.0 now fill the space between the plates of this parallel plate capacitor . calculate the new value of capacitance?
- Oil is flowing in a circular pipe of varying cross-sectional area and at all points the oil completely fills the pipe. (a) At one point in the pipe the radius is 30cm,what is the magnitude of the oil velocity if the flow rate is 1.20mcube/s?
- I don't understand these explane me please .... (Two electric lines of force naver intersect each other ?????)with diagram
- An electron is revolving round the nucleus (stationary) of charge 'Ze'. The amount of energy '47.2 eV' is required to transit the electron from 2nd orbit to 3rd orbit.What is the value of 'Z' ?
- A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by :?
- A vector of magnitude 4 unit rotates through an angle of #60degree#.Then magnitude of its change is?
- One Egyptian causeway is said to have been 3000 feet long, with a slope of about 2.3 degrees. How much force would be required to hold a 60-ton monolith on this causeway?
- B) A balloon having a volume of 10 L is placed on a sensitive balance which registers a weight of 2.833 g. What is the “true weight” of the balloon if the density of the air is 1.294 g. L^-1?
- Prove that ( vector a + vector b) * ( vector a - vector b) = a ^2 - b ^2?
- Places A and B are 80 km apart from each other.A car starts from A and other from B at the same time.If they move in the same direction,they meet in 8 hours and if they move in opposite direction they meet in 1 hour and 20 minutes.find speed ?
- If the radius of the orbit is half then the numbdr of days in 1 year will be?
- The distance between a body of mass 8000 kg and a body B of mass 6000 kg is 0.25 m.What is the gravitational potential at point #P# in the figure?
- How long will it take the sound pulse to travel out and back?
- Hot water of mass 10 kg at 90°C is cooled forr taking bath by mixing 20kg of water at 20°C. What will be the final temperature of the water neglecting the heat taken by bucket ?
- The position vector of a particle is given by r=3t2i+4t2j+7k find the displacement after 10 second?
- A body revolves with a constant speed v in a circular path of radius r . The magnitude of its average acceleration during motion between 2 points in diametrically opposite direction is --- ??
- Excess electrons are placed on a small lead sphere with mass 8.00 g so that its net charge is - 3.20 X 10- 9 C. (10 marks) (a) Find the number of excess electrons on the sphere. (b) How many excess electrons are there per lead atom?
- An electron and a photon have same wavelength #lambda#, what is the ratio of their kinetic energies ??
- Rope of length 80m and mass M is connecting two rods 50 meters high. The minimum distance of the curve from the ground is 10 meters. How far are the two rods apart?
- What is the highest height a hill could be if the roller coaster is to go over the top of it?
- Over a certain region of space, the electric potential is v=5x− 3x^2y+ 2yz . . Find the expressions for the x, y, and z components of the electric field over this region. What is the magnitude of the field at the point P that has coordinates (1, 0, -2) m?
- What is the electric potential energy in II?
- A man is walking due east at the rate of of 4kmph and the rain is falling 30° east of vertical with a velocity of 6kmph the velocity of rain relative to the man will be?
- At the center of a circular wire of radius 5cm carrying current, magnetic field due to Earth is 0.5×10^-5W/m^2 what should be the current flowing through the wire so it annuls the earth magnetic field?
- An object moves 1m in a straight line displacement a and changes direction moves another 1m in straight line displacement b and then ends up 1m from the starting point. Through which angle did it turn? Find the magnitude of a-b
- A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled pushed a distance of 4.5 m starting from rest, its speed is 6.0 m/s. What is the magnitude of the net force on the bobsled?
- Electromagnetic Induction?
- A 3kg block is attached to an ideal spring with a force constant k=200N/m. The block is given an initial velocity in the positive direction of magnitude u=12m/s and no initial displacement(x.=0). (a) find the amplitude?
- A car is driven east for a distance of 40km the north for 30km and then in a direction 30° east of north got 25km. Determine the magnitude and the angle of the total displacement from its starting point.?
- What is the relationship between time and temperature.as the body cooling down then time is?
- How is the unit for surface heat capacity derived?
- What is the Coulomb force between an electron on the outskirts of the atom and a proton in the nucleus if they are 1.40 x 10^-10m apart?
- A 36-tooth gear turns three times. It is connected to a 12-tooth gear. How many times does the 12-tooth gear turn?
- A container of rocks with a mass of 65 kilograms is is brought back from the Moon's surface where the acceleration due to gravity is 1.62 meters per second? What is the weight of the container of rocks on Earth's surface?
- What makes magnets repel or be attracted to other materials?
- One end of uniform stretcher is to be lifted from floor so that the other end may be considered to be the pivot point. The stretcher is 2m long and its mass is 20kg .how much force to lift your end, what is the mechanical advantage?
- How long should the ball take to fall on the floor from the time it leaves the edge of the table...?
- A resting car starts accelerating uniformly at #a_1# rate a then moves at a constant velocity =4m/s then decelerates at a constant rate #a_2#. the velocity of the car is greater than 2m/s for 10sec. What is the distance traversed by the car?
- What is the momentum of a 2000-kg elephant charing a hunter at a speed of 7.50 m/s?
- How do you convert 60 miles/hour to ft/sec?
- Cars P and Q start the journey from the stationary at the same time and each accelerates with the acceleration # a # and #3ms ^ - 2#. After 2 seconds, P leads Q by 6 m. Find # a #?
- A mass of 0.2kg is whirled in a horizontal circle of radius 0.5m by a string inclined at 30° to the vertical. Calculate the tension in the string and the speed of the mass in the horizontal circle?
- The electric potential is V= 5x − 3x^2y+2yz. Find the expressions for the x, y, and z components of the electric field over this region. What is the magnitude of the field at the point P that has coordinates (1, 0, -2) m?
- A car is initially at rest. After 6.0 seconds its speed is 60.0 m/s. What is the car's acceleration?
- Two blocks A and B of equal masses are attached to a string passes over a smooth pulley fixed to a wedge as shown find the magnitude of acceleration of the center of mass of the two blocks when they are released from rest . neglect friction ?
- How do I find the Voltage of this circuit?
- How is the number of electric field lines emerging out of a conductor equal to flux?
- In the diagram below, a series of waves are moving along a string. What is the wavelength (options below)?
- If a radio and bulb ra h of resistance 3ohm are connected in series of 12volts battery the potential difference across each will be, a, 6v b, 3v c, 13v?
- The summit of mount everest can be at a temperature of -50ºC and the pressure at its summit is roughly 1/3 that at sea level. The density of air at sea level is about 1.25kg/m^3. Calculate the density of air at the top of the mountain?
- A ball is dropped from a tall building. The distance between floors in the block is constant. The ball takes 0.5 sec to fall from the 14th to the 13th floor and 0.3 sec to fall from the 13th floor to the 12th. What is the distance between floors?
- An automobile is traveling at 60km/h can brake to stop at 20m distance if the car is going at 120km/h then what will be the stopping distance?
- What is 25 mi/hr converted to m/min?
- How can i increased the power of a battery i.e if the battery is of 9 volt then how can i make it of 50 volt( without changing it ) ? is there any method or device?
- Two trains, A and B, leave a train station at at the same time but in different directions, one towards east the other towards north. Trains B travels 20 km/h faster than train A. What is the average speed of each?
- Petter cycles straight north towards a crossroads. He starts 11 meters away, and the distance to the junction after t seconds is equal to 11-t^2 meters. At the same time Anne runs straight east from the intersection at a constant speed of 2m/s?
- A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of 320-g cart just after the collision?
- A girl is riding her bike down the street at a speed of 3.5m/s[E] when she hears a fire truck with a siren emitting a sound with a frequency of 425Hz. The girl detects a frequency of 475Hz. The air temperature is 28°C. Is the fire truck moving towards or?
- What is the rate at which water is being pumped into the tank in cubic centimeters per minute, If the water level is rising at a rate of 19 centimeters per minute when the height of the water is 4.0?
- A particle reaches it's highest point, when it covers half of it's range. How is the corresponding point on the 's - t' curve characterised?
- What will cause a decrease in gas pressure in a closed container?
- In a parallel circuit, two resistors have a resistance of 2 ohms and 6 ohms. The current across each resistor is 6 A and 2 A, respectively. What is the voltage?
- A tug boat that is capable of moving at 10 km/h relative to the water must make a round trip to a town 20 km upstream. If the river is flowing at 2 km/h, how long does the entire trip take?
- See image below. What is the current through the 8 Ω resistor?
- What will be the answer?
- You are rotating a bucket of water in a vertical circle. Assuming that the radius of the rotation of the water is 0.95 m, what is the minimum velocity of the bucket at the top of its swing if the water is not to spill?
- What is the difference between a longitudinal wave and a transverse wave?
- If a heater with power 1000 W gives #3.6*10^6# heat energy in 1 hour. What will be the temperature raised in 50kg of water with temperature #30^@#C by that heat?
- Derive the frequency for a third harmonic in a closed pipe from #f=v/lamda# ?
- In a house, 5 bulbs of 40W, 4 bulbs of 1000 W and 750W refrigerator are used for 5 hours daily. Thn how much energy is consumed per day?
- What is the effect of a magnetic field on a electric charge? On a moving electric charge?
- Find curl F for the vector field at the point (9, -9, 7). F(x,y,z) = x^2zi - 2xzj + yzk ?
- What is the distance a spring of stiffness #k# must be depressed if it supports an object of mass #m# on a friction-less inclined plane at an angle #theta#?
- Can someone help me answer this cal/h question?
- A rock of mass 350g is thrown upwards with in initial speed of 22m/s. What is the maximum height point it will reach?
- At what height can the water rise in the water pipes of a multi-store house, if the ground water pressure is #p# = #10^6# Pa. If the density of the water is # ρ = 1 000 "kg/m"^3 # ?
- While marching, a drum major tosses a baton into the air and catches it. The height #h# (in feet) of the baton after #t# seconds can be modeled by #h = —16t^2+32t+6#. How long is the baton in the air?
- The refractive index of the material of a double convex lens is 1.5 and its focal length is 5cm. If the radius of curvature of faces are equal, what is the radius of curvature?
- The gravitational force between two unit masses seprated by unit distance is?
- A body of weight 10N in lift which is moving upward with acceleration 2g its weight will be?
- Two vectors from an angle of 110°. One of the vectors is 20 units long and makes an angle of 40° with the vector sum of the two. Find the magnitude of the second vector and of the vector sum?
- A destroyer sends out a sonar pulse that returns from a submarine in 1.68s. If the speed of sound in seawater is 1531 m/s, how far away is the submarine?
- How to decide which forces that works on the acceleration?
- If the velocity of body is doubled then % increase in centripetal force will be?
- When kinetic energy become equal to momentum then the velocity becomes?
- What is gravitation? (a) Objects attract each other (b) what goes up must come down (c) both (a) and (b) (d) None of the options is correct.
- It is known that 1 gallon of water weighs 8.3453 pounds. which weighs more an ounce of pennies or an ounce(as capacity) of water explain.?
- Vector A has a magnitude of 17 units, vector B has a magnitude of 9.2 units, and A * B has a value of 14.0. What is the angle between the directions of Vector A and B ?
- A rabbit runs across a parking lot on which a set of coordinate...?
- True or false? -MOMENT of inertia of a particle rotation about an axis decrease when it's distance from the axis increase. Thanks
- The particles in a wave are moving up and down in comparison to the ground. What best describes the wave producing this motion?
- Why doesnt it matter where a switch is located in a series circuit?
- What is the particle's displacement from r1 to r2?
- The intensity of sunlight at the Earth's surface is about 1000W/m^2. The average temperature of the Earth is about 58°F. What must the emissivity of the Earth be?
- 2kg disc of radius 1m moment of inertia 0.5kgm^2 is released from top of 2m long incline having inclination 30degree. Find it’s velocity just before reaching the ground .??
- Consider two insulated chambers (A,B) of same volume connected by a closed knob, S. One mole of perfect gas is confined in chamber A. What is the change in entropy of gas when knob S is opened? ( R= 8.31 )
- Mechanical waves travel as disturbances in a physical medium. How do electromagnetic waves travel?
- A car slows down uniformly from a speed of 21.0 m/s to rest in 6.00 sec. How far did it travel in that time?
- Aaconverging lens of focal length 15 mm is used as a magnifying glass for inspecting stamp. A rectangular stamp which is 20mm 40mm is placed 30mm from the lens find the length of the image of the 20mm side of the stamp?
- A particle travels 10 m in first 5 s and 10 m in next 3 s . assuming constant acceleration what is the distance traveled in the next 2 s ?
- In an RC circuit the value of R is double the value of #X_c#, the phase angle is then a) 30 degrees b) 45 degrees c)60 degrees?
- A 90v charge is applied acrosd 10ohm and 20ohm resistor in series what would be the current in 20ohm resistor?
- A car goes from 10 to 20 m/s in 4 seconds. How far has it moved in that time?
- Two convex lenses of focal length 0. 2m and 0. 05 m are used to make a telescope the distance kept between them is equal to?
- A cart of mass 1000 kg is pulled by a horse of 200kg. The coefficient of friction between them and ground is 0.2. Calculate the force required to produce acceleration of 2 m/s^2 in the cart??'
- The speed of light in certain transparent is two fifth of its speed in air the index of refraction is?
- Question in the image below ?
- A particle is moving in a straight line and its distance s, in metres, from a fixed point in the line after t seconds is given by the equation s(t) = t^3 − 12t^2 + 45t. (a) Find the velocity after 2 seconds. (b) Find the acceleration after 2 seconds?
- What is a wave function and what are the requirements for it to be well-behaved, i.e. for it to properly represent physical reality?
- The acceleration of a bus is given by a-at, where a= 1.5 m/s^2...?
- Is it possible for one sound wave to cancel another?
- What is the voltage-time graph for an inductor when the switch closes?
- The acceleration of a motorcycle is given by...?
- A 4768kg roller coaster train full of riders approaches the landing dock at a speed of 17.1m/s. It is abruptly decelerated to a speed of 2.2m/s over a distance of 13.6m. What is the magnitude of the retarding force which acts upon the roller coaster cars?
- An earthquake produces a seismic wave that has a wavelength of 650 m and a frequency of 10 Hz. How fast does the wave travel?
- A boat travelling at top speed upstream moves at 15 km per hour. When it travels downstream, again at top speed, it moves at 25 km per hour. What is the boat top speed in still water?
- Deciding voltage of a capacitor in a circuit?
- What is the velocity of a wave with a frequency of 760 Hz and a wavelength of 0.45 m?
- 25 mi/h is equal to how many ft/s?
- A man throws a ball vertically upward in a compartment of an accelerated train. The ball will fall A. in front of him B. in his hand C. behind him D. beside him?
- Distance travelled in T1,T2 and T3 time intervals ar 3km,11km and 2km respectively. T1+T2+T3=36 mins.What is the maximum speed?
- Lito and Lando pull 2 ropes attached to a cabinet with forces 80 N and 120 N. What is the resultant force if they pull at right angle to each other?
- What will the change in energy of a capacitor when its voltage is increased by20% a, 22%b, 44%, c33% d 55%?
- How does kinetic energy and potential energy change into each other and back again?
- If the moment of inertia of wheel is found to be 1/2mr2 then which of the following will represent the velocity when it rolls down from. A height of "H" TO the ground?
- Two bodies of masses 4g and 16g are moving with equal Kientic energy then the ratio of their momentum will be answer is 1:2 but how?
- What is the equivalent resistance of a circuit that contains three 10.0 resistors connected in parallel with a 6.0 V battery?
- Pushing a grocery cart with a force with a magnitude of 95 N, applied at an angle of 35° down from the cart horizontal, makes the cart travel at a constant speed of 1.2 m/s. What is the frictional force acting on the cart?
- C) A cylinder contains 0.040 m3 of N2 at a pressure of 2.0 MPa. When the gas is allowed to escape it expands until it reaches atmospheric pressure of 100 KPa. What volume does the gas occupy after expanding?
- When soccer player kicks a ball, the ball accelerates. What causes this acceleration in terms of forces?
- The acceleration of gravity in the moon is 1.6 m/s^2 . If a ball is dropped on a height of 2.57 m, determine the time for the ball to fall to the surface of the moon. ?
- Angelica starts on a walk at 5 kilometres an hour. Three hours later, on the same route, Janelle starts riding her bicycle at 11 kilometres an hour. When will Janelle overtake Angelica?
- An AR series has an EMF ESinCot where E is a constant. The current i satisfies at time t, L#di/dt#+Ri=ESinCot obtain the current at time t if initially, it is zero?
- 2 sleds tied together are pulled across an icy surface with an applied force of 150 N [E]. The mass of the 1st sled is 18.0 kg and the mass of the last sled is 12.0 kg. The force of friction on each sled is 10 N. Find the magnitude of the tension in the?
- A car from stationary position accelerates uniformly over a time of 5.75 seconds and takes a distance of 34m. Determine the acceleration of the car. ??
- Robert is playing with his ballon top of a building, but the ball accidentally fell and hit the ground after 8.7 seconds. Determine the final velocity of the ball just before it hits the ground, determine the height of the building. ??
- Regie is playing with a ball on top of a building but the ball fell and hits the ground after 5.7 seconds. Calculate the final velocity of the ball just before it hits the ground, and how high is the building?
- The leopard is capable of jumping to a height of 1.9 m in hunting for food. Determine the take off speed of the leopard. ?
- A book on a shelf 2.0 meters above the floor has a mass of 1.5 kg. What is the gravitational potential energy of the book?
- An aircraft from rest accelerates on a runway at 6.50 m/s^2 for 23.25 seconds until it finally takes off the ground. Calculate the distance covered before take off. ??
- A body is projected from ground at angle 60 degree with the horizontal. If it comes back to ground at distance 60(3)^1/2 meters from starting point then what is the time of flight?
- A) A gas-fired heat exchanger uses gas with energy value of 40MJ / m^3 at a rate of 0.4 m^3/h and produces 50kg/h of water at a temperature of 70^oC from feed water at 20^oC. The rest of the question is in the picture attached.PLZ help?
- A compressor with a compression ratio of 8 takes in air at an atmospheric pressure of 100 x #10^3# N/#m^2# and a temperature of 17°C. If the pressure after compression is 900 x #10^3# N/#m^2# calculate the final temperature of the air.?
- A motorist travelled at an average speed of 48 km/h for 1 1/3 hours and then drove another 56km in 2/3 of an hour. What was her average speed for the whole journey?
- Adam drives for 80km at an average speed of 60 km/h and then he drives for 30km at 45 km/h. What was Adam's average speed for the entire trip?
- A train travels 60km in M minutes. If it's average speed is 400 km per hour,find the value of M.?
- How to find the rate of acceleration?
- What is the major functions of each engine components,1 valves, 2 cams and camshaft, 3 crankshaft, 4 intake and exhaust manifolds?
- Find the force between the two charges as well as an angle?
- If a, b& c are three non zero vectors then the expression a.(b.c) is ? a)scalar triple product b)volume of parallelepiped c)meaning less d) dot product
- A force of 80 N is applied by a janitor on the handle of a mop held at 40° with the floor. How much force is pushing the mop across the floor?
- A bug traveling with tangential velocity #v# sits halfway between the axis and the edge of a phonograph record. What will happen to its tangential speed if the RPM rate is tripled? What will happen to its tangential speed if it crawls out to the edge?
- A cable breaks if stretched by more than 2mm.it is cut into 2 equal parts.how much either part can be stretched without breaking?
- C) The copper pipe 2m long at 20°C is heated uniformly to 300°C. Calculate the length of the pipe after heating given that the coefficient of linear expansion for the pipe material is 17 X 10^-6/°C.?
- B) Calculate the energy required to heat up 50 kg of aluminium from 200C to 3000C. The specific heat capacity is 913 J/kg K. ?
- Josh pushes on a 70 kg box in the positive direction with a force of 50 N. Marissa pushes on the box in the negative direction with a force of 35 N. If the force of friction is 2N, what is the acceleration of the box?
- C) Water with a density of 1040 kg/m3 flows through a horizontal pipe having a diameter of 0.4m, with a velocity of 3.2 m/s. Calculate the volumetric flow rate.?
- A ball is thrown at 32 m/s [up] from the edge of a cliff 45 m high. What is the maximum height of the ball and at what speed will the ball strike the ground?
- A body is rotated by suspensive wire what will be the kinetic energy of the mass m?(with logic)
- How many electron would have to ejected from a body to descrease its mass by 0.03 milligrams. The mass of one electron is 9.1*10 the minus 31kg?
- If resistance is tripled and current remains constant (stays the same) in a circuit what will happen to the voltage of the circuit?
- C) A boat is in dry dock and water is allowed in until it floats. The volume of water allowed in is metered and found to be 3450 m3. The dry dock is a rectangular shape 80m long and 20 m wide. ............rest of the question in the picture? plz help
- How many joules of work are done when a 20 newton box is lifted 5 meters of the floor?
- An object starts at rest and moves along a horizontal path. It’s position, s, in meters, is given by #s(t)=t^3-9t^2+24t+5#. Is the object moving away or towards the origin when t=3s?
- B) A pump is to raise 100 litre of water a height of 1.2 m in 10s. Calculate the power required assuming 1 litre of water has a mass of 1 kg?.
- A) An object weighs 40 g in air and has a volume of 8.0 cm3. What will be its apparent weight when immersed in water?
- C) If a train accelerates at 1.5 m/s2 calculate the time taken to increase its velocity from rest to 50 km/h and the distance travelled in this time. ?
- A block of mass m=2kg is kept in position on the wall by applying an oblique force 'F' at 60° to the vertical as shown . calculate the minimum value of 'F'(the coafficient of friction between the wall and the block = 0.9) (Take 'g'=10ms^-2)?
- Is the weight of a 100-pound weight for 200 meters is equivalent to carrying a 50-pound weight for 400 meters? Is the enrgy is equivalent ?
- What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.80?
- How do I find the Voltage of this circuit?
- How do I find the Voltage on these 2 diagrams?
- A chord of length 64m is used to connect a #100\text{Kg}# astronaut to spaceship whose mass is much larger than that of the astronaut. Estimate the value of the tension in the chord?
- A point moves in #x-y# plane according to #vec r=3cos(4t)veci +3(1-sin4t) vecj#. What is the distance travelled by the particle in 0.5 sec ?
- B) A force of 90 N is used to pull a truck 200 m along a horizontal floor. Determine the work done and the increase in K. E if there is no energy loss due to friction. ?
- What is the maximum height of a ball thrown 10 m/s upward?
- B) A water tank with vertical sides is 3m wide and contains water with a density of 800 kg/ m3 to a depth of 1.8m. Calculate the hydrostatic thrust on the side of the tank. ?
- C) A cannon has a mass of 80kg and the ball has a mass of 3kg. The explosion produces a mean force of 400 N that lasts for 0.2 seconds. Calculate the final velocity of the cannon and the ball and prove that the final momentum is zero.?
- What is the magnitude of the resultant of two vectors A and B, if A = 8.0 units north and B = 4.5 units east?
- A gear of radius 4 inches turns at 8 rpm. What is the linear velocity of a tooth of the gear in feet per minute to the nearest tenth?
- What will happen when photons moving in opposite directions collide?
- Eight drops of water.each radius 2mm are falling through air at a terminal velocity of 8cm/sec If they coalesce to form a single drop the terminal velocity of the combined drop will be?
- Natasha travelled 36km at a speed of 7km/h. grover travelled 44km at a speed of 10km/hr. a) whose journey was quickest ? b) by how many times?
- Veronica angrily throws her engagement ring? (See below)
- The current through a wire depends on the time as, i=(10+4t) . Here, i is in ampere t in seconds. find the charge crossed through a section in time interval between t=0 to t=10 sec ?
- 1. Explain how the potential difference (voltage) in a battery is similar to a staircase. ?
- What is the length of air column?
- A basketball player stands 15m away from the basket to make a 3-point shot. The basket is 3m (10 ft) above the ground. Assume the ball leaves the player's hands at a height of 2m, and with velocity vector Vo=(Vox, Voy). help?
- How much time is it in the air?
- A student throws a water balloon vertically downward from the top of a building? [see below]
- IS there any machine that can multiply force and speed or distance at the same time?why?
- A 0.78 kg block is attached to a horizontal spring of force constant 256 kg/s2, resting atop a frictionless surface. The block is pulled back 30 cm and then released. What is the period of the oscillations of the block? Maximum speed of the oscillation?
- What current flows through a hair dryer plugged into a 110 Volt circuit if it has a resistance of 25 ohms?
- Weight of an object on the moon is 100N its weight on the earth will be, 1, 100N 2, 1200N 3, 50N 4, none?
- How to do this?
- A ray of light travels from air into a liquid, The ray enters the liquid at an angle of 30.0°. The angle of refraction is 22.0°. Using Snell’s law, calculate the: index of refraction of the liquid. What might the liquid be?
- How to find biot-number?
- The deceleration of a point when it is momentarily at rest which is moving along a straight line with a velocity 16-t^2 is= ???
- An open pipe of length l1 and a closed pipe of length l2 both resonate with the same tuning fork in their fundamental mode of vibration. Calculate the value of l1 /l2 ?
- What happens to the weight of an object when at sea level?
- A car is moving in the east direction with the velocity of 30.0 miles/hour. To avoid head on collision the breaks are applied and the car is brought to rest in 10.0s. Calculate the average acceleration of the car?
- An object with an initial speed of 50.0 ft/s is accelerating at 2.00ft/s^2. Find (a) the speed after the body has covered a distance of 500ft and (b) the time taken to cover this distance?
- Find the average velocity of an athlete who runs 1500m in 4 minutes, show in m/s and km/h ?
- The acceleration due to gravity is 10 m/s^2 , the velocity increases 10 m/s every second. If an object has been falling from rest for 5 seconds, what is its velocity?
- A liquid of density r and surface tension S rises to a height h in a capillary tube of diameter D. What is the weight of the liquid in the capillary tube? Take angle of contact to be 0º?
- How to calculate moment of inertia of a disc about its one diameter if given mass per unit area is proportional to distance from centre?
- The velocity of particle moving along a straight line increases according to the law#v=v_0+Kx# , where K is a positive constant,then options are below?
- The position-time graph represents two walkers traveling in a constant direction. Which equation below best represents the average speed of the walker, Kin?
- You answered my question as yes someone answered no . I need correct answer for the question is kilometer is SI unit of length?
- If you exert a force of 700 N to walk 6 m up a flight of stairs in 6 s, how much power do you use?
- If the equivalent head is measured as 400 m and g=9.8m/s^2 , what is the pressure of mercury with relative density 13.6 and that of water?
- A lever has a mechanical advantage of 5. How large would the force need to be to lift a rock with a mass of 100?
- How about this?
- If a police car with its siren on approaches you, how will the pitch of the siren be affected from the policeman's perspective?
- A jumbo jet must reach a speed of 360 km/h on the runway for takeoff. What is the least constant acceleration needed for takeoff from a 1.80 km runway?
- A little help please?
- A 30 kg weight is positioned 2 m from a fulcrum. At what distance from the fulcrum must a 40 kg weight be positioned to keep the scale balanced?
- A man 'p' 80kg runs upstairs in 12 seconds.another man 'q' 60kg runs the same stairs in 11seconds.what is the ratio of power of p to q?
- A muon (an elementary particle) moving in straight line enters a region with a speed of 5.00 x 10^6 m/s and then is slowed at the rate of 1.25 x 10^14 m/s^2. ?
- The head of a rattlesnake can accelerate at 50 m/s^2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 100 km/h from rest?
- A hiker travels in a straight line for 40 min with an average velocity that has magnitude 1.2 m/s. How far is she from her starting point after this time?
- Find the electric field at x=50cm and x=100cm?
- Earth absorbs 10^22 energy from sun everyday. What will be percentage increase in the mass if mass of earth is 6*10^24 Kg?
- Desperately need help in work, energy and power question?
- What is the force, in terms of Coulomb's constant, between two electrical charges of #-2 C# and #3 C# that are #3 m # apart?
- Why smaller mass has higher kinetic energy?
- Does a boy in rest have momentum?
- What is the speed of a 0.148 kg baseball if its kinetic energy is 107 J ? Answer in units of m/s.
- How can the angle between A×B and B×A be 180 degrees?
- A singly ionized 'He' ion and 'H' ion are accelerated from rest through a potential difference 'V' to velocities 'U(He)' and 'U(H)' respectively. What is the ratio of 'U(He)/U(H)'?
- Only two horizontal forces act on a 3.0 kg body that can move over a frictionless floor. One force is 9.0 N, acting due east, and the other is 8.0 N, acting 62 degree north of west. What is the magnitude of the body's acceleration?
- How to find time in case of torricelli's theorem (fluids)?
- Sara can lift a 10-pound weight by applying 30 pounds of force to a lever. If the amount of force Sara needs to apply to a lever is proportional to the weight she can lift, how much force would she need to apply in order to lift a 25-pound weight?
- Chapter 2: Forces and Vectors. Can you provide explanation? Thanks :)
- Forces and Vectors... See the attachment below? Thanks!
- Given the equation Q equals Q sub zero times e to the quantity negative t over R C, rearrange the equation to solve for t?
- A motor car is going due north at a speed of 50 km/h. It makes a 90 degree left turn without changing the speed . the change in velocity of the car is about?
- A bullet of mass 10 g fired with an initial velocity of 500 ms -1 hits a 20 kg wooden block at rest and gets embedded into it. (i) Calculate the velocity of the block after the impact. (ii) How much energy is lost in the collision?
- If a train travels 200 miles in 2.5 hours, what is the rate of speed?
- How to solve this?
- Two forces of magnitude 10N and 10N can't produce a resultant of 1) 0N 2) 20N 3)15N 4)none ??
- Two electrons are 1m apart , show that the force beyween them is 2.304 x 10^(-3) ?
- The sum of A and B is 5i+j and their difference is 3i-j what is vector A?
- What is the angle between two vectors.A=i-j and B=i+k?
- An elevator has a mass of 1000 kg. What is the tension force on its cables when it is stationary?
- A charged body has lost 10^3 electrons . find the magnitude of charge on the body?
- Does an object need an overall net force applied to it before it can move?
- The magnetude of vector product of two vectors is ✓3 times it's scalar product what is the angle b/t them?
- Will current pass through a capacitor attached to a DC source?
- 2 capicitor wire s habing diameter 3.0mm and T having diameter 1.5mm are connected in parallel a potential difference is applied across the ends of parallel arrangement the value of ratio of current T to current S is?
- What effect does distance have on the strength of the force of gravity?
- What is the resistance of a lamp when a voltage of 12 V across it causes a current of 4 A?
- A swimming pool is 1 meter deep at the shallow end and 3 meter deep at the deep end.to a person standing on the edge of the shallow end, the depth of the pool seems approximately the same everywhere. Explain and give a diagram?
- Question 3 part 2 and 3 please?
- VectorA=3i+4j and B=4i-3j show that VectorA&B are perpendicular to eachother?
- Calculate the p.d. across a 10 Ω resistor carrying a current of 2 A.?
- The p.d. across a 3 Ω resistor is 6 V. What is the current flowing (in ampere)? A. 0.5 B. 1 C. 2 D. 6 E. 8?
- How much energy is required to raise the temperature of a 200g block of ice from -10.0 to 0.0?
- An elephant and a mouse both have the same weight zero in the gravitation free space if they were moving toward you with the same speed with a bump into you with the same affect ?
- A boat downstream from A to B takes 7 hours, upstream from B to 9 hours. How much time does a log take from A to B? (Driftwood along the water velocity)
- On ground the gravitational force on satalite is W what is the gravitational force when the satellite is at the height of R/50 (R is radius of Earth)?
- An escalator carries 20 passengers of average mass of 60 kg. It travels 4.2 m in height in 1 minute each floor. What is the minimum power for the escalator to lift these passengers from the first floor to the third floor? (Take g = m / s^2)
- Two springs are in a series combination and are attached to a block of mass 'm' which is in equilibrium. Spring constants:k and k’ Extensions:x and x’ respectively. Find the force exerted by spring on the block?
- A pedal bicycle fitted with electrical motor the rider switch on the motor for 3.0 min.a constant current of 3.5A in the electrical motor is provided from baterry with a terminal voltage 24v.what is the energy supplied by the baterry?
- Radio signals travel at a rate of #3 × 10^8# meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of #7.5 × 10^6# meters?
- Please solve q 69?
- A particle excutes SHM of frequency f. The frequency of its kinetic energy is ?
- Find coefficient of kinetic friction?
- Why is an ammeter connected in series in a circuit?
- In the figure above , three equipotential lines are drawn around a charge. Line A is at a potential of +5V, line B is at potential of 0V, and line C is at -5V?
- If two inductors are joined in parallel their equivalent inductance is 2.4 if joined in series then equivalent inductance is 10 what is their difference?
- What type of mechanical wave is produced by pushing sharply on the end of a spring toy?
- Obtain the expression for energy stored in a capacitor 'C' when it is connected to an electric supply of 'V' volts ?
- Potential combination of cells neither increases the current nor the ppyential difference then what is the advantage of connectings cells in parallel?
- A car traveling at 50 mph goes around a curve that has a radius of 75 feet. What is the car's angular velocity in revolutions per minute to the nearest tenth?
- Why does fusion of hydrogen take place easily on stars but it is almost impossible on earth?
- You drive on the freeway between San Francisco and Sacramento at an average speed of 96 km/h (60 mi/h), and the trip takes 2 h and 10 min. On a rainy day you slow down and drive the same distance at an average speed of 80 km/h (50 mi/h). Question: ?
- A rocket is accelerating straight up from the surface. At 1.35s after lift, the rocket clears top of its launch platform, 63m above the ground. After additional 4.45s its 1 km above ground. What's the magnitude of average velocity for the 4.45s part?
- What are importance of electromagnetic waves ?
- At a construction site, a bolt slips over the edge of a steel girder, which is 35 m above the ground. At the same instant, an apple is thrown vertically upwards from the ground with a speed of 15 m/s. How do you solve parts a) and b)?
- A bullet fired into a hard target losses half of it's K.E after 3cm.how much distance will it cover before coming to rest.assuming it constantly experience opposing force?
- As a ball falls downward, what energy increases and what energy decreases?
- When two vectors A and B are drawn from a common point, the angle between them is ф. Using vector techniques, how to show that the magnitude of their vector sum is given by √A^2 + B^2 - 2AB cos ?
- If energy is conserved why are we worried aout energy crisis?
- Why is it unwise to leave a water filled glass bottle in forest?
- A object starts from rest and after 30 seconds it reaches to a velocity of 40m/s. Find the distance covered in this time?
- 2 charges, #q_A# and #q_B# are separated by distance, r, and exert a force, F, on each other. What new force will exist if: a) #q_A# is doubled? b) #q_A# and #q_B# are cut in half? c) r is a 1/3 of its normal value? d) r is cut in half, #q_A# is doubled?
- A ball strikes a horizontal floor at an angle of 45degrees with the normal to the floor. The coefficient of restitution between the ball and the floor is 0.5. The fraction of its kinetic energy lost in collision is??
- An object in satellite orbiting around the earth is weightless due to?
- Physics, Vectors?
- Convert degrees to revolution? Please
- A sound has speed of 330m/s and frequency of 50Hz what is the possible distance between 2 points on wave that have phase difference of 60°?
- How much current will an electric heater draw from 220v , if the resistance of the heater is 40 ohms ?
- What name is given to the time required for one complete wave to pass a given point?
- In which of these situations the work done by the force acting on the slab will be greater?
- If a resister of resistance R is cut 3 equal parts.then what is the resistance of equivalent r when connected in parallel?
- Two cars are 175m apart, facing each other. At that instant, the first car is traveling at 9.0 km/h [W] and is accelerating at 3.6m/s^2 [W]. The second car is traveling at a constant velocity of 21.5 m/s [E].?
- How to calculate power for series and parallel circuits?
- A skier skis 7.40 km in the direction 45.0 east of south, then 2.80 km in the direction 30.0° north of east. and finally 5.20 km in the direction 22.0° west of north. Show these displacements on a diagram? How far is the skier from the starting point?
- Physics Work and Energy Question?
- What is another name of first law of motion?and why is it given that name?thank you so much
- Given two vectors A = -1.00 î + 3.00j + 5.00k and B = 2.00j + 3.00 1.00 k, how can I find the magnitude of each vector and write an expression for the vector difference A-B, using init vectors?
- A boy is standing 6m in front of a mirror, he moves 2m towaords the mirror. what will be the distance between a boy and his image now?
- Specify the x and y coordinates? (Mechanics)
- If I want heat 60degrees the 30liters of within 5mins, how much wattage is required..??
- (2j×3i).k=? My text book says the answer is -6. But how?
- Gold has a specific heat of 0.129 J/g °C. How many joules of heat energy are required to raise the temperature of 16 grams of gold from 23 °C to 94 °C?
- How will a body move after dropped off from a plane?
- How much work is done when a body moves with uniform velocity?
- How does the variation of the period change in a compound pendulum? How does the period change with different lengths and amount of pendulums? What equations can be used in a compound pendulum?
- Physics :- Motion in a straight line ....... HELP?
- Is no work done same as 0 work done?
- Can you please explain the steps when you answer ? A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 0.35x10^6 g at a distance of 2.50 cm from the axis. What angular velocity in rev/min is required?
- If #hata_1,hata_2andhata_3 #are unit vectors and#2hata_1+2hata_2+hata_3=0# then angle between #hata_1 and hata_2 # is?
- For a particle of a rotating rigid body, #v=r\omega.# So (1) #\omega \propto (1/r)# (2) #\omega \propto v# (3) #v \propto r# (4) #\omega# is independent of #r# Which options are correct?
- What is the distance?
- Can someone help me answer this SHM problem?
- The electric field intensity at P and Q in the shown arrangement are in the ratio???
- A projectile is projected at an angle of 15° to the horizontal with speed v. If another projectile is projected with the same speed,then at what angle with the horizontal it must be projected so as yo have the same range?
- A person moving on earth's surface starts from north and moves 500km towards south and then moves 1000km towards East and then again 500km towards north and stopped.find the magnitude of the displacement of the person ?(assume earth to be perfect sphere)
- A baseball is thrown at an angle of 25º relative to the ground at a speed of 23.0 m/s. If the ball is caught 42.0 m from where it is thrown, how long was it in the air?
- Determine true velocity?
- What are all the colours of the visible spectrum?
- What is the meaning of saying " the plwer of lens is 1 dioptre"?
- #vecP+vecQ+vecR=0# and #|vecP|=3, |vecQ|=4, |vecR|=5# then angle between #vecP# and #vecR# is?
- The resultant of two vectors#vecP# and #vecQ# is #vecR#. if the magnitude of#vecQ# is doubled , the new resultant becomes perpendicular to #vecP#. then magnitude of #vecR# is?
- A 1000 kg crate is being lowered into a ship's hold with an acceleration of 2 ms-2. The tension in the rope is ____N ?
- If #hata_1+hata_2+hata_3=0# then the value of #|hata_1-hata_2|^2+|hata_2-hata_3|^2+|hata_3-hata_1|^2# is?
- Find the displacement with an increasing acceleration? The actual question is below.
- A bullet of mass 10gm is fired with a rifle . The bullet takes 0.003sec. to move through its barrel and leaves with a velocity of 300m/sec . What is the force exerted on the bullet by the rifle?
- If the speed of light is 3x10^8, determine the distance it takes in 1 light year. Report your results in km and in m. ????
- |a+b|=30N, |b|=24N and angle between(a+b) and b is 53°. Find a)the angle between a and b b)|a| and |a-b| c) angle between a and (a+b)?
- What is order of magnitude of 49 kg?
- A man of mass 80 kg is standing in a lift, which is accelerating upwards with an acceleration of 0.6 ms-2. The size of the force between the man and the lift floor is ___N?
- If a proton,neutron and electron are placed in a magnetic field then which particle will experience zero force?
- The reaction time for an automobile driver is 0.7 sec.If the automobile can be decelarated at 5 m/s^2 calculate the total distance travelled in coming to stop from an initial velocity of 8.33 m/s after a signal is observed?
- A vector of magnitude 12 units in XY plane is making an angle of 120° with positive X-axis. Find that vector and also unit vector in the opposite of this vector?
- A car from rest accelerates uniformly & passes two points 120m apart in 6.0s. If the car passes second point with velocity 25.0m/s, what is velocity when it passes the first point? what is the distance of the second point from the starting point?
- A fuse wire can with stand 0.1A of current. How many bulbs of power rating 110W/220V can be connected in series with the fuse wire, If input supply is 220V?
- What is the purpose of a machine?
- A man can swim directly across a stream of width S met resin t seconds when there us current and time t' when there is current.show that the velocity of the current is S×√{1/t²-1/t'²}?
- A cyclist can pedal at a speed of 3m/s for 6 min. How many meters will the cyclist pedal in that time?
- You do 25 J of work to move a 4 N object 5 meters. What is your efficiency?
- Two runners start from opposite ends of a course, one running at 16 km/h, the other at 20 km/h. When they meet, their two running times total 1 hour. If the slower runner has gone 2 fewer kilometers than the faster, how has the faster runner gone ?
- The rate of rotation of a solid disk with a radius of #12 m# and mass of #5 kg# constantly changes from #4 Hz# to #6 Hz#. If the change in rotational frequency occurs over #4 s#, what torque was applied to the disk?
- A particle is projected up directly up a rough plane of inclination ¥ with velocity u.if after coming to rest the partcle returns to its starting point with a velocity v.show that the coefficient of friction is €=[{u²-v²}÷{u²+v²}tan¥]?
- Consider point charges q1=+2 micro coulombs,q2=+4 micro coulombs,q3=+6 micro coulombs and q4=-6 micro coulombs placed at four corners of a square.Each diagonal is of length 2metres.what is the electric intensity at the center of the square?
- If the speed of light is 3x10^8 m/s and the sun's distance from the earth is 93 million miles. Calculate the time it takes the sunlight to reach the earth. Report your results in seconds and in minutes. ????
- A man walks a distance of 3km due east, then another 4km due south. What is the displacement relative to his starting point?
- A body of mass 10kg moving with a constant velocity of 10m/s.when a constant force acts for 4sec on it .it moves with velocity 2m/s in opposite direction the acceleration produced is ?
- (help pls)A wooden rod is placed on top of the piston, performs a vertical simple harmonic motion. find 1) and 2)?
- X takes 3 hrs more than Y to walk 30 km. But, if X doubles his pace, he is ahead of Y by 1.5 hrs. What is their speed of walking?
- If the current in a floodlamp is 5 A, what charge passes in 1 s, ii. 10 s, iii. 5 minutes?
- A sound wave of amplitude 0.2mm has an intensity of 3W/m(squared). what will be the intensity of sound of same frequency having amplitude 0.4mm?
- Sarah flies from Oklahoma City to Dallas-Ft. Worth in 30 minutes. The air distance is 175 miles. what formulas can calculate the speed of the plane?
- Place a rectangular book with a length L in parallel with the end line of the desk and push it a little by little. How long can a book go out of the desk without falling off? (use the statics and equilibrium concepts to explain this)
- Light of wavelength 5000 Å and intensity 39.8 W/m² is incident on a metal surface. If only 1% photons of incident light emit photo electrons, then what will be the number of electrons emitted/sec/unit area from the surface?
- The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into light and heat when i. a charge of 1 C passes through it, ii. a charge of 5 C passes through it, iii. a current of 2 A flows in it for 10 s?
- Potential energy of mass m is U(x)=Eₒ,when 0≤x≤1, =0when x≻1.The total energy of the particle is 2Eₒ. The De Broglie wave length of the particle is λ₁ when 0≤x≤1 and λ₂ when x≻1. what is the ratio of λ₁ and λ₂ ?
- A wire has a resistance of 100 ohms. It is compressed to half of its original length keeping volume same then what will be its new resistance in ohm?
- Radius of a wire is 2.5mm and its lenfth is 50.0cm.If it's Mass is measured to be 25gm then find its densite up to correct significant figures?
- A hang glider dropped his cell phone from a height of 350 feet. How many seconds did it take for the cell phone to reach the ground?
- The brightest light detected from the star Antares has a frequency of about 8 X 10 to the power of 22 Hz. What is the wavelength of this light?
- The lens is removed from the camera and held at a distance of 4 cm from an ant of length 2mm. what is the length of the ant? (the image distance(v) is 10cm and the focal length was 7.5cm before the lens was removed)
- A piston whose area is 50 cm 2 moves through a distance of 30 cm against a pressure of two atmospheres. Calculate the work done in Lt. atm., Nm and calories?
- A meteorite travelling through space enters a cloud of gas. The initial speed is #u# , and after penetrating the cloud by a distance of #x# the deceleration is #kx^2# . Find the distance the meteorite penetrates?
- Help needed in centripetal question?
- How do I find the moment of inertia of a hollow cylinder?
- Centripetal force question?!
- The relation between the velocity and the position of a particle is v=Ax+B , where A & B are constants. Acceleration of the particle is 10 when its velocity is a.How much is the acceleration when it's velocity is 2a?
- A train has a speed of 5m/s while a bird has a speed of 10m/s. It takes 80 secs for the bird to fly from the back of the train to the front, and back again. How long is the train?
- Find the current through each resistor using Kirchhoff's rules. Express your answers using two significant figures separated by commas.?
- A box is on a table. The area of the box in contact with the table is 1500 cm2. The pressure on the table is 28 newtons/m2. Work out the force exerted by the box on the table ? Give your answer correct to the nearest whole number.
- You're conducting a physics experiment on another planet. You drop a rock from a height of 2.1 m and it hits the ground 0.6 seconds later. What is the acceleration due to gravity on this planet?
- The smallest insect a bat can detect are approximately the size of one wavelength of the sound the bat makes. a) what minimum frequency of the sound is necessary for the bat to detect an insect 0.57cm long? b) what is the period of the wave?
- How much heat is required to convert steam of 100c to water of 100c?
- Suppose a person weighs 100 pounds. If he travels to a planet with 5 times the mass of Earth and 10 times the radius of Earth, what will his new weight be?
- How do you convert kilograms to Newtons?
- Why can two mechanical waves occupy the same space at the same time?
- What happens if we use oil instead of water in hot water bags?
- A transformer for a distribution line receives 2V ac and step up to 240V ac. The secondary contains 300 turns and draws 10 A. Calculate; 1). The number of turns in the primary coil? 2). The current in the primary? 3). The power in the primary?
- Two satellites #P_"1"# and #P_"2"# are revolving in orbits of radii #R# and #4R#. The ratio of maximum and minimum angular velocities of the line joining #P_"1"# and #P_"2"# is ??
- A 4m car travelling 72km/hr comes behind a 20 m truck. The car pulls out from behind the truck with the front of the car 10 m behind the rear of the truck and accelerates at 3.5 m/s^2 until the rear of the car is 10 m in front of the truck. Time? Dist?
- Calculate the longest wavelength of sound that a human can hear. The speed of sound in air is 340m/s?
- If a spring is cut into 9 equal pieces then they r connected in series with the same mass.what will be it's frequency relative to the original frequency?my text book says that the answer is 9f.but Time period of spring does not depend on length.right?
- Q. A stone is dropped from the window of a bus moving at 60 km/hr. If the window is 196cm high, what is the distance along the track which the stone moves before striking the ground ?
- What happens to the frequency of a mass attached to spring when energy becomes 16times?
- If the power of the lens is negative, does it mean that nature of lens is diverging?
- A woman at an airport is towing her 20.0-kg suitcase at constant speed by pulling on a strap at an angle θ above the horizontal (see figure). She pulls on the strap with a 35.0-N force, and the friction force on the suitcase is 20.0 N.?
- A hot air balloon ascending at a constant rate climbed 86 meters in 48 seconds. At this rate, about how many minutes will it take the balloon to climb to an altitude of 3/4 kilometer?
- The distance a body falls varies directly as the square of the time it falls. IF an object falls 64 feet in 2 seconds, how long will it take to fall 256 feet?
- If vector P+vector Q=vector R ;and if P^2+Q^2=R^2 then find the angle between the vectorP and vectorQ?
- If a particle moves with acceleration = #10x-2x^3# and v= 0 at x=1, is the motion simple harmonic? And how do you describe the motion?
- Who state the law of conservation of energy and in what year?
- If we were colliding a Ball (182.20 g Mass), at 100% speed (1.94 m/s), into a tennis ball of the same size, but half the mass of the primary ball, what could we determine about the motion and energy of the tennis ball after the collision?
- A car of mass 1200kg pulls a trailer of mass of 400kg along a straight horizontal road. The car and trailer are connected by a tow-rope modelled as a light inextensible rod. The engine of the car provides a constant driving force of 3200N. (see ? below)
- What is the velocity if the wave length is 0.1 and the frequency 3000 ?
- #C = (\frac{1}{C_1} + \cdots + \frac{1}{C_n})^{-1} # and in parallel is # C = C_1 + \cdots + C_n# Capacitance?
- What will be the impulse if force at 10 s is 10 N ?(SSETR 2018 EXAM)
- A horizontal force of 60.0N is exerted on a 5.8kg discuss as it is rotated uniformly in a horizontal circle (at arm's length) of radius 1.00m. Calculate the speed of the discuss.?
- If two objects are released from a certain height both will reach at the same time.but according to fluid dynamics (terminal velocity) the denser will reach first.does it mean that the concept of terminal velocity is wrong??
- Two rain drops each of radius r are falling with terminal velocity vt while in motion they coalesce into one drop what is the terminal velocity of the drop so formed?
- A mass is bouncing on the end of a vertical spring/ Its motion will be simple harmonic if the spring: ?
- A race car driver won a 700 mile race with a speed of 155.5 miles per hour. Find drivers time?
- Ad or subtract friction when a force is applied ?
- Why a spoon in a cup of tea appears broken ?
- What is reverberation?
- Who made the first crystal prism? In what time period did he create it?
- Ap Physics C 1991 Question 1?
- How to find the velocity and acceleration at t=0?
- Force. It can be said that 1 kg is equal to 2.21 lb, What does this statement mean? What should be the proper way of making the comparison?
- If your mass is 50 kg what is your mass on the moon?
- A wire has a resistance R If its length is doubled and radius is reduced to half then its resistance will become? (A) 2R (B) 4R(Cy8R D) 16R
- At what height would the Kinetic energy of a falling particle be equal to half of its potential energy?
- How are work, force, and distance related?
- A boy holds a 40-N weight at arm's length for 10 seconds. His arm s 1.5 m above the ground. What is the work done by the force of the boy on the weight while he is holding?
- Tommy and Zach are starting out at the same position. Tommy runs north at 3 miles per hour and Zach starts to run east 2 hours later at the rate of 4 miles per hour. How long until Tommy and Zach are 8 miles apart?
- A particle in a circular path has instantaneous angular and linear velocities respectively equal to 30rad/sec and 20rad/sec.what is the magnitude of centripetal acceleration?
- What is the angular displacement by minute's hand of a clock after 5 minutes?
- The electric potential at point (x, y, z) Is given by V=-x²y-xz³+4. What is the magnitude of electric field at (1,1,1)?
- How would solve the equation?
- Two cars are starting at the same point. One car starts driving north at a constant speed of 25mph. Two hours later, the other car drives east at a constant speed of 20mph. How long until the cars are 300 miles apart?
- A 131 kg car is at rest at the top of a 39 m high hill. If the car rolls down a frictionless hill, how fast will it be moving when it reaches ground level?
- The cable supporting a 2100-kg elevator has a maximum strength of 21750N. What maximum upward acceleration can it give the elevator without breaking?
- A box A of mass 0.8kg rests on a rough horizontal table and is attached to one end of a light inextensible string. The string passes over a smooth pulley fixed at the edge of the table. (see ? below)
- A loop of wire with resistance of 10 ohm moves in a contant non uniform magnetic field,it loses kinetic energy at a uniform rate of 4 J/s.The induce current in loop is? a)0 b)2mA c)2.8mA d)20mA
- How much energy (in joules) is released when 0.06 kilograms of mercury is condensed to a liquid at the same temperature? A. 17,705.1 J B. 20,075.04 J C. 51,302.88 J D. 697.08 J
- A projectile fired with a speed of v=60m/s at an angle of 60°. a second projectile is then fired with the same initial speed 0.5s later. Find the angle #theta# of the second projectile so that they will collide and what position (x, y) will it occur?
- A body is released from height equal to the radius of earth the velocity of the object when it strikes the surface is? 1) ✓gr 2) ✓2gr 3) 2✓gr
- Let the angle between two non zero vectors A(vector) and B(vector ) be 120(degrees) and its resultant be C(vector). Then which of the following is(are) correct?
- A football player hit a brick instead of football he got hurt but brick did not move greatly.why he did get hurt and why brick do not move?
- What is an example of a way a mechanical wave can be transmitted?
- Superman jumped off the ground and accelerated his #120# #kg# frame at a rate of #30# #m##/s^2#. What was the force that was the Superman applied to the ground as he jumped?
- In an 80 km biathlon, a competitor completes the bicycle leg in 2 hours and the running leg in 40 minutes. If the competitor cycles 20 km/h faster than he runs, at what speed does he cycle?
- What are two properties that make a metal a good choice to use as wire in electronics?
- Ap Physics C 1995 Question 1?
- Eight electric dipoles (each having charge 'e') are placed at the centre of a regular cube of each side '1m'. What is the total normally outward flux through the cube?
- Ap Physics C 2002 M2?
- Where is charge most easily transferred?
- Ap Physics C 1989 M2?
- A concave mirror with a focal length of 16.0 cm produces an images located 38.6cm from the mirror. what is the distance of the object from the front of the mirror?
- What is the physicist's term for the measure of the amount of disorder?
- How long must a pendulum be the Moon, where g-16 N/kg, to have period of 2.0 s?
- Give one example of motion in which a body has constant speed but not constant velocity?
- If two quantities have same dimensions ,do they represent same physical content?
- A subway train starts from rest at a station and accelerates at a rate of 1.95m/s^2 for 18.4 s. It runs at a constant speed for 68.2 s, and slows down at a rate of -3.539m/s^2 until it stops at the next station. What is the total distance covered?
- If #hat(a_1),hat(a_2)and hat(a_3)# are unit vectors and #2hat(a_1)+2hat(a_2)+hat(a_3) =0# then angle between #hat(a_1) and hat(a_2)# is ?
- A circuit has two #"6 Ω"# resistors in parallel, given input current is 6A, What is the current at one resistor?
- What will be position of the final image?
- Do heavier objects fall more slowly than lighter objects?
- During an emergency stop, a #1.5*10^3#-kilogram car lost a total of #3.0 * 10^5# joules of kinetic energy. What was the speed of the car at the moment the brakes were applied?
- A student is investigating the effect on her wight when travelling in a lift. She is standing on scales which are graduated in Newtons.?
- Let there be spherically symmetric charge distribution with charge density P(x)=Pₒ[(5/4)-(r/R)] up-to r=R, P(r)=0 for r≻R. Where 'r'is the distance from origin. What is the electric field at a distance 'r' (r≻R) form the origin?
- How does the velocity of radio waves compare with the velocity of visible light waves ?
- If #|A+B| / |A-B|=1# what is the value of A.B and A X B??
- How much heat is needed to raise the temperature by 10 0C of 5 kg of a substance of specific heat capacity 300 J/ (kg 0C)?
- A ball is dropped from a height of 10 feet.Each time it hits the ground, it bounces to 80% of it's previous height. Find the total distance travelled by the ball?
- A body moving with uniform acceleration Travels 84 metre in the first 6 second and 180 m in the next 5 seconds. find: (a) the initial velocity ,and (b) the acceleration of the body ?
- A boy weighs 400 N. What is his mass?
- An astronaut weighs 750 N on the earth. What is the astronaut's mass?
- The mass of a large car is #1000# #kg#. How much force would be required to accelerate the car at a rate of #3# #m##/sec^2#?
- Could anyone please help me with part F?
- Assume that in interstellar space the distance between two electrons is about 0.47 cm. What is the electric force between the two electrons?
- What is the difference between retardation and deceleration?
- By the gauss's theorem show that the electric field in a hollow spherical conductor is zero?
- What does "centripetal'' mean?
- A grinding wheel has a diameter of 200mm. If it rotates at 2100 rev/min. What is the circumferential speed?
- The angular speed of a two-speed drilling machine is increased from 1200 rev/min to 3000 rev/min in 12 seconds. a. What is its angular acceleration assuming it to be uniform? b. How many revolutions does the motor make during this time?
- A .6 kg brick is dropped from a height of 8 m. It hits the ground and comes to rest. What is the magnitude of the impulse exerted by the ground on the brick?
- A wheel rotating at 490 rev/min accelerates uniformly at 0.5 rad/s^2 for 30s. Find a. The angular velocity after 30s b. The pulleys peripheral speed if its diameter is 20cm c. The angle turned by the wheel during this time?
- A wheel has a constant angular acceleration of 3 rad/s^2. In a 4 second interval it turns through an angle of 120 radians. Assuming the wheel started from rest, how long had it been in motion from the start of thus 4 second interval?
- A projectile has maximum range of 20 m when projected with velocity v if it is projected at an angle of 15 degrees then what is it's range?(velocity same)
- What is the angular speed of a car rounding a circular turn of radius 80m at 72km/h?
- A 70 kg person climbs up 2 meters in 2.8 seconds. How much energy did they gain? How much power did they use?
- A projectile is projected with speed of 19.6 m/s with angle 30 degrees.what is the verticle component of it's velocity after 1sec of flight?
- A cylindrical capacitor is constructed using two coaxial cylinders of the same length 10cm and if radii 2mm and 4mm.Another capacitor of same length is constructed with Cylinders of radii 4mm and 8mm .Calculate the capacitance?
- Three kids in a parking lot launch a rocket that rises into the air along a 442-m long arc in 40 s. What is the average speed?
- For what angle range becomes double of height in a projectile motion?
- What is the angle between A×B andB×A?
- A 2.6kg car is rolling down a frictionless incline that makes an angle of 23º to the horizontal. The initial speed of the car is 4.3m/s. What is the speed of the car 26m down the incline?
- An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and direction of the net force?
- A meteorological balloon of mass 0.2 Kg falls vertically from rest, the total resistance at V m/s is approximately (1+0.1V)N taking g=9.8 m/s^2# . Calculate: a) The terminal velocity? b) Time taken for the balloon to reach half of the terminal velocity?
- Calculate the values of the molar heat capacities Cv and Cp of a gas,if the ratio of the heat capacities is 1.33.What is the atomicity of the gas?Given R=8.31J/mol-k.
- A Child drops a ball from a height of 10m its velocity increases at the rate of 10 M/s^2.find ? A)The velocity with which the ball strikes the ground. B)Time taken by the ball to reach the ground.
- A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 45 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352 J?
- An object travels 16mtrs in 4sec and then another 16mtrs in 2 sec along a straight path. what are its average speed and average velocity?
- The current in a circuit is 8+4i amps. The impedance is 7+ i ohms. What is the voltage?
- Say I'm moving parallel to someone else and we are both accelerating in the same direction at the same rate. Would he seem stationary to me? Could we tell we were accelerating?
- The formula for finding the discharge of a river is (velocity of water) * (cross section of channel). What would be the discharge of a stream that moves at #1.5# #m##/##s# through an area of #520# #m##/##s^2#?
- Can anyone help me with parts A-D?
- An aeroplane flies from A to B at the rate of 500 km/ hour and comes back from B to A at the rate of 700 km/ hour. The average speed of the aeroplane is......?
- In a vacuum, what falls faster, a bowling ball or a feather?
- Consider a #"3 kg"# box on a flat surface. If the coefficient of static friction is #0.5#, #(a)# what is the pulling force needed to move the box, and #(b)# if one pulls at a #60^@# angle with respect to the horizontal, what force is needed instead?
- A driver starts his parked car and within 5 seconds reaches a speed of 60 km/h, as he travels east. What is his acceleration?
- What are examples of 1st, 2nd, and 3d class levers?
- How to solve this variable acceleration Q, parts a to c?
- A firework shell is fired from a mortar on the ground. Its hight is modeled by the function h=-16t^2+224t, where h is the height in feet and t is the time in seconds. If the shell does not explode, how long will it take for it to reach the ground?
- Can anyone help me with parts A and B?
- What can forces cause objects to do? What is an example?
- If vector A& B are such that |A+B|=|A|=|B|, then |A-B| may be equated to √3|A|. proof??
- Why does not the speed of sound depends on the pressure of the air?
- If the box is at rest, the net force acting on it is equal to....?? 1) the weight. 2) friction. 3) the normal force. 4) zero.
- True or false? -It is easier to open a door by pushing it at the hinges rather than it at the handle. Thanks
- It takes Luke 1 hr and 45 mins to run 14 miles. What is his average speed?
- How many grams of water would require 2,153 joules of heat to raise its temperature from 44 °C to 81 °C? The specific heat of water is 4.184 J/g °C.
- A major department store has just installed three new escalators. Each one is designed to carry 120 people, each of average mass 70kg. per min to a floor 10.0m higher. The engine which drives these escalators is 65% energy efficient. What?
- What is the greatest possible error when measuring to the nearest quarter of an inch?
- What is the frequency of this wave? What is the wavelength of this wave?
- A space ship approaches Earth at a speed of 0.8 C. The ship shoots a laser at a nearby meteor. What is the speed of the light of the laser?
- A car accelerates uniformly in a straight line from rest at the rate of #2.3##m##/##s^2#. What is the speed of the car after it has traveled 55 m? How long does it take the car to travel 55 m?
- A boat, which has a speed of 5km/h in still water, crosses a river of width 1km along the shortest path possible in 15 minutes. Find the velocity of the river?
- What type of exhaust comes from a Steam Engine, Internal Combustion Engine, and a Hydrogen Fuel Cell?
- A rock is dropped into an abandoned mine, and a splash is heard 4 seconds later. Assuming that sound takes a negligible time to travel up the mineshaft, what is the depth of the shaft and how fast is the rock falling when it hit the water?
- The initial speed of a certain car is #"10 m/s"# before it brakes over the course of #"10 m"#. If its initial speed was #"30 m/s"# instead, what distance would it need to successfully brake with the same deceleration?
- A) determine all the forces on the block. Show all your work B) determin µk, show all your work . PLEASE HELP ?
- How long does it take an automobile traveling in the lane of a highway at 65.0 km/h to overtake (become even with ) another car that is traveling in the right lane at 25.0 km/h when the car from bumpers are initially 80 m apart ?
- From the top of a cliff 30m high,a stone is dropped.At that time,another stone is projected upward from 'a' the ground with a speed of 30m/s.After how much time and what height from the ground will the two stones cross each other?
- If we increase kinetic energy of a body 300% then percent increase in momentum is...??
- Prove that a guill shoot 3 times as high when it is fired at an angle of 60 degree as when it is fired at an angle of 30 degrees but at the same horizontal range?
- Precalculus- finding torque using cross products?
- A marble dropped from a bridge strikes the water in 5.0 s. what is the height of the bridge? (Answer in meters)A
- What is the frequency of a sound wave having a velocity of 341 meters/second and a wavelength of 0.8 meters? 426 hertz 400 hertz 800 hertz 210 hertz
- Why is it easier to balance on a bicycle when it is moving and so difficult to balance on it when it is still?
- An object is thrown vertically at a height of #7 m# at #1 m/s#. How long will it take for the object to hit the ground?
- What is the formula for speed of pendulum at any point?
- At the range Mr. Romeo tests his gun to be shooting at 90 m/s. The mass of a paintball is 30 grams. The mass of his gun is 6 kg. What speed is his gun recoiling at?
- What is the dimensional formula of Bernoulli's theorem?
- If a speeding train hits the brake and it takes the train 39 seconds to go from 54.8 m/s to 12 m/s, what is the train acceleration?
- A stone is thrown into a circular pond of radius 1 meter. Suppose the stone falls uniformly at random on the area of the pond. What will be the expected distance of the stone from the center of the pond?
- A model rocket engine has an average thrust of 5.1 N. It has an initial mass of 38 g, which includes fuel mass of 10.5 g. The duration of the burn is 2.18 s. (a)What is the average exhaust speed of the engine?
- What is the mass of a 735-N weight on Earth?
- Why is the answer to the below question B not C?
- A 47.4 kg student runs down the sidewalk and jumps with a horizontal speed of 4.20 m/s onto a stationary skateboard. The student and skateboard move down the sidewalk with a speed of 3.95 m/s. What is the mass of the skateboard?
- Three large metal plates are arranged as shown. How much charge will flow through the key if it is closed ?
- Could anyone help me with parts B, C, and E it would be greatly appreciated?
- Find angle between unit vectors I+j+k cap And I+j cap by cross product?
- Light travels at approximately #3.0*10^8# #m##/##sec#, How far does light travel in one week?
- Explain how Newton’s first law of motion is related to the concept of inertia?
- How to find net capacitance?
- How much work is done by the force lifting a 0.1 kg hamburger vertically upward at a constant velocity of 0.3 m from a table? I thought that if it's at constant velocity, there is no work done. However all the answer choices are non-zero. Please help!
- If a ball is initially dropped from height h and has coefficient of restitution 0.9 .How many bounced will the ball make before comping to rest? Please help...
- How does sound travel through a medium?
- Why is the efficiency in the below question 0.25 not 0.33?
- How is this question solved? Why is it C?
- A beam of light in air hits a sheet of float glass at an angle of 30.0 . What is the angle of refraction of the light ray?
- Can someone please answer the question below?
- Help with the following?
- A bicycle moves with speed of 6km/h for 2 hrs and 4km/h for the next 3 hrs. Find the average speed and distance traveled?
- Two insulated charged spherical bodies having radii R and 2R have their same surface density of charges (D). When these two bodies are connected by a conducting wire, what will be the surface density of charge of the bigger sphere?
- A pendulum consists of a small mass 'm' suspended by a thread of length 'l'. The mass carries a +q charge. The pendulum is placed in uniform electric field 'E' directed vertically upwards. What will be the time period of the oscillation?
- Vector A=i- 2j+ k, what will be the unit vector parallel to XY plane and perpendicular to vector A?
- At what point (in km from Earth) between Earth and Saturn is the net force of gravity on a body by both Earth and Saturn exactly zero?
- The height of a projectile launched upward at a speed of 32 feet/second from a height of 48 feet is given by the function: h(t)=-16t^2+32t+48. How long will it take the projectile to hit the ground?
- How much heat is required to melt 185 grams of ice at 0-degree Celsius and then raise the temperature of the resulting water to 32.0 degrees Celsius?
- A satellite X of mass m orbits the Earth with a period T. What will be the orbital period of satellite Y of mass 2m occupying the same orbit as X?
- I am confused. Can someone please help me with this as quickly as possible?
- If you have lamp with 300 W power output And the average wavelength of the source is 590nm how many photons are emitted per second?
- Why is the efficiency 75% instead of 50% in the question below?
- Under what condition does a particle experiencing electric force perform simple harmonic motion?
- An ion has a charge of #3.2*10^14# #C#. Another charge is brought near it and experiences a repulsive electrostatic force. What is the charge of the other particle?
- Differentiate between mass and weight?
- The infrared ray that is propagated through the TV remote has a wavelength of 1.3pm. How do i calculate the energy of a photon of the infrared ray with this wavelenth? Thanks
- Why is this capacitor useful?
- Two equal vectors V and V' are added together. What are the possible values for the magnitude of the resultant vector?
- 400g of water at temperature 15°c is placed in an electric kettle.The power rating of kettle is at 3.0kw.calculate the energy required to raise the temperature to 100°c?
- A vessel cylindrical in shape and closed at the top and the bottom of the radius R and height H.The vessel is completely filled with water?
- Physics Vectors?
- What is the energy loss of a photon of a certain wavelength after scattering?
- A projectile is thrown with the speed 'u' at an angle '⍬' to the horizontal. What is the radius of curvature of it's trajectory when the velocity vector of the projectile makes an angle '⍺' with the horizontal?
- What makes a satellite move in an orbit that is circular?
- A point charge of 5.9 μC is placed at the origin (x1 = 0) of a coordinate system, and another charge of –2.7 μC is placed placed on the x-axis at x2 = 0.23 m (Coulomb's law)?
- What are the ways the sun and earth can be used to generate electricty ?
- An open-ended pipe is 6 meters long. What is the wavelength of a first harmonic standing wave?
- Two projectiles, one fired from earth with 5m/s and other from another planet with 3m/s trace identical trajectory. If g (earth) = 9.8 m/s², then g (planet) = ?
- The rms speed of smoke particles of mass 50*10-15kg at NTP will be??
- A motor raises an elevator weighing 5000 N a distance of 8 meters in 20 s. What is the work done by the motor, the power of the motor in Watts, and the horsepower of the motor?
- A loaded ski lift pulls 20 chairs with people sitting in them up 200 meters. Each chair with a person has 250 kg of total mass. How much work does it take to lift them?
- Calculate the ratio of drag force on a jet flying at 1200km/h at an altitude of 15km to the drag force on a prop driven transport flying at half that speed and altitude. The density of air is 0.38 kg/m^3 at 15 km and 0.67 kg/m^3 at 7.5 km?
- Imagine a circuit with a 47-volt battery attached to four resistors, all in parallel: a 13-ohm resistor, a 3-ohm resistor, a 15-ohm resistor, and a 4-ohm resistor. What is the total resistance of this circuit?
- If a light burns out in a parallel circuit, what happens to other lights that may be connected and why?
- A pile driver weighing 1500 pounds drops with the speed of 20 ft/sec. What is the kinetic energy of the pile driver when it hits a steel beam that it is driving into the ground?
- An object in static equilibrium has a coefficient of static friction as 0.110. If the normal force acting on the object is 95.0 newtons, what is the mass of the object?
- Position-time equation for a train is #x_t=2.9m+(8.5m/s)t+(2.9m/s^2)t^2#. What is the position at #4.9s# up to three significant digits?
- The answer should be ?
- A block of mass 5kg hanging at the end of spring scale is totally submerged in a beaker of water. The beaker is large enough to avoid overflow of water. If the density of the block is 2500kg/m^3,then what is the reading of the scale?
- A large water tank open at the top has a small hole through its side near the bottom. To what height should the water be filled, to double the speed of water that flow out of the hole when it was filled to height h? A.h B.2h C.3h D.4h
- A coil possessing both inductance L and resistance R is connected to a 24V dc supply having negligible internal resistance. The dc current in this circuit is found to be 3A. When the coil is connected to a 24V, 50Hz ac supply with negligible internal....?
- Two small spheres, each of mass 'm' and positive charge 'q', hang from light threads 'l'. Each thread makes an angle with the vertical as shown in the picture...?
- A stone is thrown horizontally with velocity √(2gh) from a top of a tower of hight 'h'. Find where it will strike the level ground through the foot of the tower. What will be it's striking velocity?
- A 10 kg car is moving at 44 m/s when it collides with a stationary 71 kg truck. The two cars interlock and move off at what speed?
- The total momentum of 2 marbles before a collision is 0.06kg•m/sec. No outside forces act on the marbles. What is the total momentum of the marbles after the collision?
- The distance between two objects with mass m1 and m2 are in the intergalactic space is equal to l. With no other forces acting except gravity, how soon will they collide?
- What is an almost infinite reservoir for electric charge?
- How do this question? about Vertical launch
- What would be the effect of connecting the battery the way round?
- A boat mass M and I fill it up with fuel mass m. When it moves with velocity υ the resistive force is F=kυ^2. 1kg of fuel gives λ Joules of energy*. How much fuel (kg) is needed to sail d meters? *Suppose no energy is lost.
- Why can work output be less than work Input but never be more?
- The Earth takes 1 day to rotate once about its axis. What is the angular velocity of a point on the surface of the Earth?
- The water is spreading round it's side from a fountain kept just above the soil. If the velocity of fountain water be 'V', then how much area would get wet?
- A monochromatic beam of light passes obliquely from flint glass into air. How do the characteristics of beam of light changes?
- A 2 cm high object is placed 12 cm from a convex lens, perpendicular to the principal axis.The lens forms a real image,whose size is 1.5 cm.Find the power of lens?
- Wether displacement is a scalar or vector?
- A rock is thrown from the top of a tall building. Then distance, in feet, between the rock and the ground t seconds after it is thrown is given by d=-16t^2-4t+382. After how many seconds wil it be at a distance of 370 feet from the ground?
- A proton in a parallel accelerator has a speed of 5.0 x 10^6 m/s going downward.The proton encouters a magnetic field whose magnitude is 0.40 T and whose direction makes angle of 30.0° with respect to the protons velocity. See details for question?
- A transverse wave propagates along the positive direction of the axis x. Calculate??
- How does the type of wire affect resistance in a wire?
- How to understand this ?
- How to express the mass of a proton and an elektron in MeV/c²? Thank you!
- When using the Hofmann Voltameter, which of the two gases collected are positively or negatively charged?
- A car is backing up at 3 m/s sees a dog and slams on his brakes to stop over a period of 2 seconds. Is this negative or positive acceleration?
- If an unbalanced force act on a body in which direction acceleration is produced?
- Why i = 0 A ?
- How to solve this ?
- A garden has an internal diameter of 2.0cm. The diameter of its nozzle is 0.8cm. Assuming that the speed of water in the hose is 0.35m/s, what will be the speed through the nozzle?
- Electromagnetic waves of an unknown source are received and it is discovered that a photon of this radiation has energy of 6.63*10^-19 J?
- Is it true that constant velocity means zero acceleration but constant acceleration does not mean zero velocity?
- With what speed in Km/h must an object be thrown to reach a height of 91.5 m? Assume negligible air resistance.
- How do I calculate this ?
- Why does light get polarised when reflected and refracted?
- A trunk is dragged 3.0 meters across an attic floor by a force of 2.0 N. How much positive work is done on the trunk?
- A 500kg roller coaster is moving at 10 m/s on a straight portion of frictionless track. You need ___ Newtons of force to keep the train moving at a constant velocity. How many newtons??
- Find the resultant vector? 1/6 of 240 m/s directed east ?= 1/4 of 240 m/s 1/5 of 250 degrees south of west
- It is known that objects of different mass will fall at the same speed bit of you drop a feather and coconut the coconut will fall faster.Why?
- How does inertia affect the motion of an object?
- How do I answer this ?
- How to calculate time take to reach maximum height?
- An object has an excess charge of -1.92*10^-7 C . How many excess electrons does it have?
- What is the temperature of a body if the resistance of a resistance thermometer is 0.5 ohms at 0 degree celsius, 55 ohms at 100degree celsius and 10 ohms at the temperature of the body?
- The speed of light is #3*10^8# #m##/s#. What is the frequency of microwaves with a wavelength of #1# #cm#?
- Position-time equation for the train is #x_t=2.6m+(8.1m/s)t+(2.6m/s^2)t^2#. What is (A) its initial velocity (B) its acceleration?
- Calculate the time taken for a car to cover a distance of 100m if the initial speed is 10km/h and it has a constant acceleration of 1.5m/s2?
- An aeroplane flying in the sky dives with a speed of 100 m/s in vertical circle of radius 200m.weight of the pilot sitting in it is 75kg. The force with which the pilot presses his seat when aeroplane is at highest position ?(in kg wt)
- A meter scale is held vertically with one of the ends on the floor without slipping.the velocity of the upper end of the scale when it hits the floor is?? 9.8m/s 8.9 45 5.4
- An actor shoots a gun at a special stunt wall, which explodes when hit by the bullet. The wall is 80.8 m away, and the actor hears the sound of the explosion 0.430 s after shooting the gun. What is the average speed of the bullet?
- The force of gravity on a 2-kg rock is twice as great as that on a 1-kg rock. Why then doesn't the heavier rock fall faster?
- Three rods each of mass M and length L, are joined together to form an equilateral triangle. What is the moment of inertia of a system about an Axis passing through its centre of mass and perpendicular to the plane of the triangle?
- What is the total resistance if you connect 25 ohms to a 10 volt battery?
- Can someone please explain this?
- What is the frequency of a sound wave with a wavelength of 0.04 meter in air? What type of wave is this, transverse or longitudinal
- A 700 man stands in a scale on the floor of an elevetor.the scale records the force it exerts in whatever is on it.what is the scale reading if the elevetor has an acceleration of (a) 1.8m/s up? (b)1.8m/s down?
- Help me please, Two particles each of mass m, are joined by a thin string of length 2L, as shown in Figure 48. A uniform force F is applied in the middle of the string (x = 0) forming a right angle with the initial position of the string. Show that th????
- Why does water not fall out of a straw when it is closed on one end?
- A meter scale is held vertically with one of the ends on the floor. Its other end falls to floor without scale slipping. the velocity of the upper end of the scale when it hits the floor is?? 9.8m/s 8.9 45 5.4
- A person travels the total distance in two parts in ratio 2:1 with a constant speed of 30km/h in the first part and 40km/h in the second part.What is average speed of the journey?
- How do I know which Newton's law to use in any question?
- Calculate the relative permittivity of a KCl crystal at optical frequencies?
- What is the difference uniform and constant velocity ?Is acceleration zero in case of both constant and uniform velocity?
- Why φ (phi) = x and r = y ?
- As a body falls, its potential energy increases with its speed. TRUE OR FALSE?
- In the given figure of hydraulic press, if the cross section area of cylinder 'A' and 'B' are #0.5 m^2# and #10 m^2# respectively, what magnitude of effort is to be applied on cylinder 'A' to balance the load of #1000N# on cylinder 'B' ?
- How can I calculate the magnitude of displacement?
- How can I prove this equation: #"mvr" = "nh"/(2π)#?
- Equal mass of three liquids are kept in three identical cylindrical vessel A, B and C the densities are d(A),d(B) and d(C) with d(A)<d(B)<d(C) will the forces in all the vessels are same at the base. How?
- What is the change in the object’s velocity from t=4 to t=10?
- Convert 22m/s^2 to km/m^2?
- 'If a sound traveling through a medium has a frequency of 520 Hertz and a wavelength of 6.92 M, what is its speed?'
- Question number 5 how can i solve the question ?
- The amount of heat required to raise the temperature of a substance of mass is given by Q=mcA(temperature simbol). Derive the units of c?
- What is the wavelength of a 320 Hz sound traveling 330 m/s?
- What kind of wave interaction occurs when ripples in a bathtub hit the wall of the tub?
- The height of a cannon ball t seconds after it is fire from a position 10 meters above the ground is given by h(t)= -4.9t^2 +14t+10 (cont. below) find the velocity at time t. At time t=2 seconds? what is maximum height of the ball? what is the velocity ?
- What formula of moment of inertia Solid cylinder about an axis passing through central diameter and central axis ?
- What is the coil current 2ms after being connected to the supply if a coil of inductance 0.5H and resistance 500#Omega# is connected across a 250V DC supply? (The time constant T of the circuit is 1ms).
- The pressure of a gas at 35.60C is 114.3kPa. What is the pressure when the temperature drops to 17.3 0C? Assume constant volume?
- Index of refraction?
- If the mass of a balloon is 300 kg and the lift force provided by the atmosphere is 3300 N, what is the net force on the balloon?
- An airplane flies with a velocity of 750 kilometres per hour, 30.0°south of east . What is the magnitude of the eastward component of the plane's velocity?
- What is the answer ?
- What similarities do all electromagnetic waves share?
- Which has the lowest magnitude ?
- A particle is projected at an angle A and after t seconds, it appears to have an angle of B with the horizontal. The initial velocity is:- A)gt/(2 sin(A-B)) B)gt cos B/(sin (A-B)) C)sin(A-B)/2gt D)2 sin(A-B)/(gt cos B)?
- How to find the maximum distance traveled by a ball of mass M, tied to a light elastic string, projected vertically downwards with an initial velocity of Vo?
- Why does violet color bend the most when entering crown glass?
- The position of a particle is given by s= f(t)=t^3-6t^2+9 where t is in seconds and s in meters ? a) when is the particle moving backward ( that is in the negative direction)? b) FInd the acceleration at time t and after 4s?
- What are some examples of light as a particle?
- A 5m length of conducting wire has overall resistance 2#Omega# with current flowing through it. It dissipates 8W of power along its length. Wire contains #8*10^22# free electrons. Calculate the average drift velocity of the electrons?
- Radio signals travel at a rate of #3*10^8# meters per second. How many seconds would it take signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of #4.2 * 10^7# meters?
- Which angle should I use for the relative velocity of bus to car ?
- Check whether the function f(z)=(2z-z^2) is harmoic or not?
- How to convert time? Thank you!
- An aircraft lands and brakes, slowing from 250 m/s to 5 m/s in 30 secs. What is its acceleration?
- What is the heat of fusion of mercury in J/kg?
- Can any body explain Davisson and Germer experiment with graph ?
- An object weighs #32# #N#. What is its mass if a gravitometer indicates that #g = 8.25# #m##/sec^2#?
- A body of mass 2kg is dropped from rest position 5m above the ground. what is its velocity at height 3.0m above the ground approximately?
- How to find magnitude of the force?
- What is the result of mixing 1kg ice at 0°c with 100kg steam at 100°c? Solve
- How to determine the depth of a water well given the initial velocity, the time and the speed of sound?
- Which of the following are scalar quantities, which are victor authorities, and which are neither?
- 50 km/hr = __?__ m/s
- What are bosons?
- What is the weight of each of the following objects? A. 0.113 kg hockey puck B. 108 Kg football player C. 870kg automobile
- A,B,C are points in sequence on highway such that AB/3 = BC/2. Find velocity at A & C, at B it is 20m/s. If acceleration is constant?
- A 16.0 kg fish swimming @ 1.10m/s suddenly gobbles up a 4.40 kg fish. That is initially at rest. A) Find the speed of the large fish just after it eats the small one B) How much mechanical energy is lost?
- What is the force, in terms of Coulomb's constant, between two electrical charges of #14 C# and #29 C# that are #4 m # apart?
- A 2000 kg car traveling to the east is slowed down uniformly from an intitial velocity of 40.0 m/s by a 7000 N braking force acting opposite the car's motion. using the impulse momentum theorem, what is the car's velocity after 3.0 seconds?
- Calculate the electric energy flowing into the filament of an electric bulb in 20 secs, when it's resistance is 40ohm and potential differance across it's terminal is 12V?
- Find the sum of the vectors u and v it theta is the angle between them?
- A projectile is fired with initial speed v0 = 37.0 m/s from level ground at a target that is on the ground, at distance R = 13.0 m, as shown in the figure. What are the (a) least and (b) greatest launch angles that will allow the projectile to hit the ?
- W= |u| * v +|v| * u Where u and v and w are all non-zero vectors Show that w bisects the angle between u and v ?
- Marcus and Kiwi are going for a ride in their new wagon! Then they will roll down a frictionless hill, dropping a total height of 2.0 meters. How far into the leaf pile will the kitties and wagon travel before coming to a stop?
- How do you find the horizontal Velocity?
- Can someone explain this?
- A plane is flying horizontally at a height 1.5 km from the ground with a velocity 200m/s when it is just above a anti airgun at that moment a bullet is thrown from it with velocity400m/s.find the angle of projection of bullet to crush the plane?
- ADD vectors A,,B,C each having a magnitude of 100 unit and inclined to the X-axis at an angle 45,135,315 respectively?
- The hydraulic cylinder BD exerts on member ABC a force P directed along line BD. Knowing that P must have a 750-N component perpendicular to member ABC, determine (a) the magnitude of the force P, (b) its component parallel to ABC?
- What distance must an electron move in a uniform potential gradient 200 v/cm in order to gain Kinetic energy 3.2×10^-18 J?(e=-1.6×10^-19C , Me=9×10^-31kg)
- How to find the normalized form of an eigenvector if that eigenvector has a complex element ,forexample find the normalized form of [1/√2;i/√2;1/√2]?
- How much heat energy is required to convert 2kg of ice at 0°C to water at the same temperature? Latent heat of fusion of water= 3.3X10^5
- A body of mass 10kg is moving with a velocity (6i +8j) at a certain instant. it's K.E will be. A) 250J B) 500J C)100 J D) 1000J ...?
- How does the distance an object travels affect the force with which it hits a spring scale?
- What is value for the acceleration of gravity?
- Distance question?
- A 2500 kg car traveling at 30 m/s hits a utility pole and comes to rest in 0.26 seconds. what force is experienced by the car?
- How to find the maximum velocity of two objects that travel from a point #A# to a stopping point #B# in the same amount of time?
- Work done in stretching the spring from x= .10 m to x= .20 m?
- A roller coaster is moving at 25 m/s at the bottom of a hill. Three seconds later it reaches the top of the hill moving at 10 m/s. What was the acceleration of the coaster?
- If the mass of the body on earth is 10kg then its mass on the surface of the moon will be?
- A particle of mass m moves under the force given by F = a(sinωt i +cosωt j). a,w are constants and t is time.It is intially at rest at the origin.What is work done on the particle up to time t and the instantaneous power given to the particle at time t?
- What is the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s?
- Electricity problem..... please can you solve this...?
- Can you answer this question of physics?
- How do i solve this? An airplane heads N60°E at 600 mi/h in still air. A tail wind begins to blow in the direction N30°E at 50 mi/h. Find the resulting speed of the airplane and its resulting direction of travel. Draw a diagram
- 2 forces each of magnitude 8N act at point in the direction of OA and OB the angle between the forces is theta resultant of two force has component 9N in the direction OA find value of theta?
- What will the acceleration of the ping pong ball be as it falls in a vacuum on Earth?
- A car is moving at 60km/hr when it begins to slow down with a deceleration of 1.50m/s^2.how long does it take to travel 70m as it slows down?
- Which equation finds m, given E and c?
- Bohr and Planck's equation?
- A gun recoils with a velocity of 4 m/sec when it fires a 25 gram bullet lat a speed of 600 m/sec. What is the mass of the gun in Kg?
- If a sound is played with a frequency of 480 Hz, and a second sound is played with a frequency of 800 Hz, what is the name of the musical interval between the two sounds?
- A stone is thrown at an angle of #53^@# and it reaches its highest point in #2# seconds. What is its velocity at the highest point?
- A ball of mass m is droped from a height h , losing x% of its energy(that it had before the respective drop) on each fall.Calculate how many times the ball will fall until it stops and how long it will take the ball to do that.(?)
- If the mass of earth were 2 times the present mass,the mass of the moon were half the present mass and the moon were revolving round the earth at the earth at the same present distance, the time period of revolution of the moon would be(in days)?
- A #6# #kg# object experiences a #5# #m##/##s^2# acceleration. What is the force that caused this acceleration?
- What are the characteristics of bulbs connected in series?
- Find the minimum diameter of an alloy cable, tensile stress75 MPa (75,000,000 Pa), needed to support a Force of 15 kN (15,000 N)?
- Convert 40km/min velocity into ms-1?
- What is the distance it takes from Camb B to base Camp O ? ( Physics Vectors)
- A jet plane accelerate from rest on runway at 4m/s^-2. find the distance covered after 5s?
- What is the speed of the ball at point B? (Physics)
- How to find the moment of inertia of a cut-out object?
- A hydraulic lift used at an automotive repair shop raises a 1000-kg car 2meters off ground. what is the potential energy given to the car?
- A system has a total mechanical energy of 350 J and kinetic energy of 220 J. What is its potential energy?
- The 1500 Ω resistor on electronic circuit board has correct power rating of 0.25 W.State disadvantage of using different 1500 Ω resistor with power rating that is (1)much less than 0.25 W? (2)much greater than 0.25 W?
- On the ground the gravitational force,of the satellite is w. What is the gravitational force on the satellite,when at a height R/50. A) 0.96w B) 0.98w C) 1.02w D) 1.04w ....?
- What is schrodinger's cat?
- Displacement from origin?
- What is a net force?
- How to solve this basic kinematics problem?
- Four identical metallic objects carry the following charges: +1.6, +6.2, -4.8, and 9 .c. The object are brought simultaneously into contact , so that each touches the others. Then they are seperated. (a) what is the final charge on each object?
- Why a free proton in nuclear physics is always assigned by 1H1(mass no 1 &atomic no1) and whenever proton mass is used,mass of 1H1 is written, what is the reason?
- A car accelerates uniformly at a rate of 2.8 m/s^2. How long does it take for the car to accelerate from a speed of 12.7 m/s to a speed of 19.3 m/s?
- An object starts from rest and falls freely. What is the velocity of the object at the end of 3.00 seconds?
- Show that the nuclear density of 1H1(mass no-1&atomic no-1)is over 10^14 times greater than its atomic density (assume the atom to have the radius of the first Bohr orbit).In this question,what should I put for nuclear mass&atomic mass?
- How do i find the units in a math problem?
- What is the proof for a diffraction grating formula #dsintheta=nlamda#?
- Physics motion question!?
- Let U=[-1,2,5].find all scalars k such that ||kU||=4?
- Calculate the work done by a 47 N force pushing a 0.025 kg pencil 0.25 m against a force of 23 N?
- A 10,000-watt radio station transmits 535 kHz. What is the number of joules transmitted per second?
- An iron rod of length 100m at 10°C used to measure a distance of 2km on a day when the temperature is 40°C. Calculate the error in measuring the distance?
- What is the acceleration of a body moving with uniform velocity?
- A circular coil (10 turns, diameter = 25 cm) is placed perpendicular to a uniform magnetic field (B = 2.7 x 10-3 T). If the direction of the magnetic field is reversed in 0.30s, what is the average emf induced in the coil?
- A man weighing 100kg on the earth is found to weigh 101kg when on the space ship .What is the velocity of the space ship ?
- A rod 1m long moves with a velocity of 0.6c.Calculate it's length as it appears to an observer on the earth?
- A rocketship 100m long on the earth is moving with 0.9c.How much it's length will appear to an observer on the earth?
- At time t, the position of a body moving along the s-axis is m. Find the body's acceleration each time the velocity is zero?
- A 0.145 kg baseball is moving at 35 m/s it is caught by a player. What is the change in momentum of the ball?
- A boat can travel from its dock to a town downriver with a 7 mph current in 10 hours. The return trip against the same takes 15 hours. What is the speed of the boat in still water?
- The bulk modulus of lead is #4.6# GPa. By what fraction will the density of a piece of lead increase if it is lowered to the bottom of the Pacific Ocean where the pressure is #40# MPa?
- Two point charges 4*10^-6C and 2*10^-6C are placed at the vertices A and B of a right angled triangle ABC respectively. B is the right angle, AC=2*10^-2 m and BC=10^-2m. Find the magnitude and direction of resultant electric intensity at C?
- A cubical box consists of 4 square sides and a square base but has no top. The sides and the base are all made of thin sheet metal of uniform thickness. If the edges of the box are all 200 mm in length, how far above the base is the box’s centre of mass?
- A great conical mound of height h is built by workers. If the workers simply heap up uniform material found at ground level, and the total weight of the finished mound is M, show that the work they do is (1/4)hM?
- What force can be felt when you put your hand out the window of a moving car?
- Ordinary boron is a mixture of 10B5(mass no=10,atomic no=5)&11B5(mass no=11,atomic no=5)isotopes & has a composite atomic mass of 10.82u.What percentage of each isotope is present in ordinary boron?
- If a 75 kg person on a 15 kg sled is pushed with a force of 900 N, what will teh person's acceleration be?
- Calculate the angular frequency of the system shown in the figure. Friction is absent and threads are massless? Hint: The system performs SHM. Try not to use the energy conservation method.
- A copper wire has a diameter of #0.5mm# and resistivity of #1.6*10^-8Omegam#. What will be the length of this wire to make its resistance #102Omega#?
- A car accelerates uniformly from rest along a straight road until it reaches #50ms^-1#. Once this speed is reached it immediately starts to decelerate uniformly until stationary again. If the total distance travelled is 600m, how long does journey take?
- Is it possible to accurately approximate the speed of a passing car while standing in the protected front hall of the school?
- An 80 -lb and a 100-lb child are balancing a seasaw. The 80-lb child is 5ft from the fulcrum. How far from the fulcrum is the child 100 l-lb?
- In simple harmonic motion of a spring, how does increasing the mass affect the amplitude and what equations do I use to prove it?
- What is the actual source of earth's magnetic field?
- Does amplitude of a spring mass system change when mass is added?
- how much heat energy is needed to change 100 g of ice at 0 ⁰C to water at 30 ⁰C?.
- Wich of the following is a vector? A. 20 N west B. 42`C C. 3:15 pm D. 5 km down E. 20 m/s west F. 30 m/s to the right
- Physics and calculus?
- A block of mass 5 kg is at rest on a ramp which is at 25◦. The coefficient of static friction between the block and the slope is 0.4. What is the minimum magnitude of the horizontal force, F, that is required to make the block move? Assume #g=10ms^-2#
- When we double the voltage we double the------?
- What is the reason behind the fact that natural systems always tends to evolve towards configuration of minimum potential energy?
- Why test charge is positive?
- What are the number of joules required to raise the temperature of 1000 g of ethyl alcohol by 15 degrees celcius?
- The threshold frequency of silver is 9.71×1015 Hz. What is the work function of silver?
- The radius of a spherical soap bubble increases @ 0.2 cm per second find the rate of increase of its surface area when the radius is 7 cm?
- An athlete whose weight is 800N runs a race with acceleration of 5 metres per second square. What is the force that the athlete ran with?
- An electron with a velocity of #1×10^7 ms^-1# enters a magnetic field of strength #10 T# aligned perpendicular to the direction of motion of the electron. Calculate the radius of the orbital path that the electron now follows?
- The end of two thin steel rods of equal length are welded together to make a right angled frame. Locate the frame's center of mass?
- The resistance of a 20 cm long wire is 5 ohms stretched to a uniform wire of length 40 cm. What is the resistance of the wire?
- An object has a kinetic energy of 500 J due to its linear motion. What would be the kinetic energy of an object with half the mass and twice the momentum?
- The figure shows three circuits I, II and III which are connected to a 3V battery. If the powers dissipated by the configurations I, II and III are P 1 , P 2 and P 3 respectively, then =?
- A car was travelling with a speed of 80 kph covers the same distance in 3 hours as a truck travelling with a speed of 60 kph does how in many hours?
- The highest-pitched sounds most humans can hear have a wavelength of .017 m in air. What is the frequency of these sound waves if the speed of the wave is 340 m/s?
- Question #4802e
- An electron is moving to the east at a speed of #1.8*10^6 m/s#. It feels a force in the upward direction with a magnitude of #2.2*10^-12N#. What is the magnitude and direction of the magnetic field this electron just passed through?
- Who came up with the planetary model: Rutherford or Bohr?
- A rocket with a total mass of #20 kg# will take off with an acceleration of #12 ms^-2# if it is launched so that its trajectory is vertically upward. a) Calculate the force produced by the rocket engine? (please check below for part b)
- Can you please explain what is the refrance point os this example??
- How much energy is required to melt #7.3g# of ice at #0^circC#?
- A particle starts from rest and moved in a straight line the velocity of the particle at time t after start is v m/s where #v= 0.01t^3 +0.22t^2 -0.4t# Find the time at which the acceleration of the particle is greatest?
- A point moves in X−Y plane according to X=a sin(wt) and Y=a (1−cos(wt)). What path will the particle follow?
- A sound wave with a frequency of 2.0 kilohertz is traveling through the air at stp determine the wavelength?
- A particle P moves in a straight line. Velocity v ms^-1 at time t s is given by #v=5t(t-2)# for #0<t<4# #v=k# for #4<t<14# #V=68-2t# for #14<t<20# Find the set of values of t for which acceleration is positive?
- Why gravitational potential energy always have a negative sign?Also explain the graph of variation of gravitational potential energy with distance r from the centre of the earth?
- Can anyone help me with 9709 may/June/2017 paper 43 Question number 7 part (ii) I have found velocity and acceleration as #v=1.68# and #a=2.83# I don't understand how it will move further?
- A stationary ball weighing 0.25 kg aquires a speed of 10m/s when hit by a hockey stick. What is the impulse imparted to ball?
- A strong lightning bolt transfers about 30 C to earth. How many electrons are transferred?
- What is an example of a nonideal oscillator?
- Why are tension values different on a pulley with two masses?
- Determine the inductive reactance when a #30.0" mH"# inductor with a negligible resistance is connected to a #1.30xx10^3" Hz"# oscillator? Thanks
- What is the combined resistance of a 6 ohm resistor which is connected in series with a parallel arrangement of two resistors, each resistance of 2 ohm? Thanks
- If P+Q=R and if Q is doubled and R is doubled then find Q? Note. P ,Q And R are vectors each
- A solid weighs 32 gf in air and 28.8 gf in water. What is the relative density of the solid?
- Help with physics?
- Three forces P, Q and R act at the same point and are in equilibrium. The forces P and Q have magnitudes 30 N and 20 N respectively, and there is an angle of 20° between their directions. Calculate the magnitude of the force R?
- A tube filled with mercury has a resistance of 15ohm at 0 degrees, if the tube is heated up to 65degrees what will be the resistance? Take the tube temperature coefficient of resistance as 0,0042ohm/degree
- A pulley system with 75% efficiency is set up to lift a 21kg bag of nails. The bag is lifted to a height of 2.3m by a person pulling on the rope with a force of 91.5N. What is the mechanical advantage of this pulley system?
- A conical tank is buried 1 foot underground with the apex pointing up, base down. The height of the cone is 5 ft and the radius is 6 ft. It is filled with liquid with density k pounds per cubic foot. Work involved in pumping the fluid to ground level?
- What is an example of an electric field practice problem?
- If a copper wire is stretched to make its radius decrease by 0.1%, then the % increase in its resistance is approximately?
- Please help me with question number 6 part (i)?
- A press machine is required to punch out discs of 40 mm diameter from steel plate 1.5 mm thick with a shear strength of 200 MPa. Calculate the compressive strength in the punch.?
- Six identical particles each of mass ‘m’ are arranged at the corners of a regular hexagon of side length ‘L’. If the masses of any two adjacent particles are doubled. The shift in the centre of mass is???
- The Moon has a radius of #1737 km# and the gravitational acceleration at its surface is #1.62ms^-2#. Assuming that the Moon is a sphere of uniform density, what is its density?
- Mechanics help?
- Anna walks up the stairs on her way to class. She weighs 565 Newtons, and the stairs go up 325 meters vertically. What is Anna's power output if she gets to the top of the stairs in 12.6 seconds?
- What is the final velocity of the lighter object? (See below)
- Hi can someone help me find this calorie equation?
- When wave enter from rarer to denser medium it undergoes path difference of how many???
- Two forces, A and B, have a resultant C. (In other words A + B = C, as vectors). If A = 5 N, B = 7 N and C = 8 N, what is the angle between A and C?
- Why do objects in free fall appear to be weightless?
- Find # i# for #t>0 # if the circuit is in steady state at # t=0# ?
- If speed of a body is increased by 1 percent...what is the change in its kinetic energy?
- The acceleration of gravity near the surface of Mars is 3.72m/sec^2. A rock is thrown straight up from the surface with an initial velocity of 23m/sec. How high does it go? (Hint: When is the velocity zero?) Thank you!!!
- A semiconductor has a band gap of 1.5 eV. What is the minimum wavelength in nm required to promote an electron from the valence to the conduction band?
- A shell fired from a gun has a horizontal range of 1200 m and a flight time of 10 s. What is the magnitude and direction of the velocity of projection?
- Once a sound recording is made, how is the sound reproduced?
- A hypothetical particle has a mass 512eV/c^2.If such a particle at rest decays into two gamma-rays photons, what is the wavelength of each photon?
- Calculate the tensile stress in a nylon fishing line of diameter 0.36 mm which a fish is pulling with a force of 20 N?
- Integer type answer?
- The vector sum of the forces of 10N and 6N can be?
- A particle P moves in a straight line starting from point O with velocity #2#m/s the acceleration of P at time t after leaving O is #2*t^(2/3)# m/s^2 Show that #t^(5/3)=5/6# When velocity of P is #3#m/s?
- A 12V car battery can move 200 C of charge in the time it takes to start a ca. How much energy does it take to start a car?
- Help with physics"(?)"
- What's the value of 57.281 joules in Btu?
- A simple pendulum has length 20cm.it was displaced at an angle 15° and then released to execute simple harmonic motion. How much time is required for the pendulum to reach maximum speed?
- Which has more kinetic energy, a 4.0 kg bowling ball moving at 1.0 m/s or a 1.0 kg bocce ball moving at 4.0 m/s? Why?
- An object performs simple harmonic motion between points k an L with a period 40pi if the distance between k and L is 10cm what is the speed of object when it is 8cm away from equilbrium position?
- What is the energy of a gamma ray photon whose frequency is #5.02 \times 10^20# Hz?
- Why does the Doppler effect occur?
- How to convert from #(dyn)/(cm)^2# to #N/(m)^2# ?
- Velocity time graph problem?.
- Frictional force is non Conservative force.How?
- What is the kinetic energy (in kJ) of a 2.50 kg ball traveling at a speed of 600 m/s?
- How much kinetic energy is lost in the collision? (See full question below)
- It is question about forces and equilibrium ?
- When is the net torque about a point 0?
- For the following problems, you can assume that the speed of sound is 340 m/s. If the frequency of an electromagnetic wave is 2.147×109 what is the wavelength?
- How many two input NAND gates are required to perform the action of a two input OR gate?
- A force produces an acceleration of 1.5 m/s^2 in a disk. Three such disks are tied together and the same force is applied on the combination. What will be the acceleration? (Ans:- 0.5m/s^2)
- What angle yields the maximum possible range for a projectile?
- How does Gauss Law work inside a conducting sphere?
- What uses sound waves to locate objects underwater?
- Two forces of magnitude 10and3n are acting at an angle other than zero which of yhe following cannot be their possible suma) 13 N b) 9N c)7N d)12N?
- A force of 4.0 N acts on a body of mass 2 kg for 4 secs. Assuming the body to be initially at rest , find the distance covered in 10 sec after the force starts acting? (Ans:- 64 meter)
- In harmonic oscillator transition from ground state to second excited state is forbidden, why?
- Deciding current in a circuit?
- A helicopter ascending upawards throws a stone downwards. Is the displacement or velocity of the stone negative?
- An object 20cm high is placed 45cm from the lens of focal length 15cm? calculate the image distance and the size of the image and the nature of the image? If a concvex lens and a concave lens is used.
- A room is at a constant temperature of 300 K. A hotplate in the room is at a temperature of 400 K and loses energy by radiation at a rate of P. What is the rate of loss of energy from the hotplate when its temperature is 500 K?
- Find the position #s# as a function of time #t# from the given velocity #v= {ds}/{dt}#. Then evaluate the constant of integration so that #s=s_0# when #t=0#. #v=8(s)^(1/2), qquad s_0=9# Help please?? and thank you!!!
- What is the difference between a law and a theory?
- Question is about finding force etc.?
- Which person has a higher linear velocity?
- Please answer it in a sentence from the picture below?
- Limiting equilibrium means #ma=0# In #F-f=ma# ?
- An electric motor can usefully convert 18 J of energy each second into kinetic energy to raise a mass above the ground. The motor has an input current of 2.5 A and an operating voltage of 16 V. Calculate the efficiency of the motor?
- A ball has a kinetic energy of 100 J. What would be the kinetic energy of a ball with twice the mass and half the momentum?
- In a television tube, electrons are accelerated by a high voltage, and strike the screen with an average velocity of 4.04x10^6 m s^-1. Calculate the average de Broglie wavelength (in nm) of the electrons?
- For the following problems, you can assume that the speed of sound is 340 m/s. In space a wave has a frequency of 1.151×10^14 Hz, what is the wavelength?
- On an alien planet, a ball is thrown vertically upwards from the ground, rises to a height of 100 m, and then falls back to the ground. The total time is taken from when the ball was thrown upwards to when it reached the ground again, is 10 seconds.....?
- What is the force of gravitational attraction between a man (mass 70 kg) and the Earth?
- Two runners leave the starting gate, one running 12 mph and the other 10 mph. If they maintain the pace, how long will it take for them to be one-quarter of a mile apart?
- What is the speed of an EM wave in space that has a frequency of 2.328×10^17 Hz? For the following problems, you can assume that the speed of sound is 340 m/s.
- A capacitor of capacitance C has a charge of Q stored on the plates. The potential difference between the plates is doubled. What is the change in the energy stored by the capacitor?
- The waves that carry the most energy are the waves that?
- Electric Field lines point in the direction a negative charge would move. True or False?
- A cat pushes on a .25kg mouse toy for 3.0 seconds, resulting in a velocity of 18 m/s. The force of the cat was how many N?
- Suppose that an airplane flying 60 m/s, at a height of 300m, dropped a sack of flour. How far from the point of release would the sack have traveled when it struck the ground?
- A car going 50km/h accelerates to pass a truck. Five seconds later the car is going 80km/h? What is the acceleration?
- How long will it take a car to accelerate from 14.2 m/s to 24.5 m/s if the car has an average acceleration of 2.2 m/s^2 ?
- A body of mass 5kg is moving with a momentum of 10kgms-1.A force of 0.2N acts on it in direction of motion of body for 10sec.The increase in kinetic energy is?
- If #hat a# and #hat b# are unit vectors that make an angle of 60 degrees with each other, calculate?
- What is the work done by a 47 N force pushing a 0.025 kg pencil 0.25 m against a force of 23 N?
- What is the force, in terms of Coulomb's constant, between two electrical charges of #6 C# and #4 C# that are #2 m # apart?
- The amount of heat required to heat 1.5 litres of water from 30C to 75C is?
- The uncertainty in the values for specific heat capacity is 5%. Water of mass (100+-2) g is heated from (75.0+_0.5)C to (85.0+-0.5)C. (i) Calculate the energy required to raise the temperature of the water from 75C to 85C.?
- A light beam is reflected off the edge of an optic fibre at an angle of 0.0042o . The diameter of the fibre is 69 µm. Find the equation of the reflected beam with the -axis (at the centre of the fibre) and the yaxis as shown?
- A basketball player stands 15m away from the basket to make a 3-point shot. The basket is 3m (10 ft) above the ground. Assume the ball leaves the player's hands at a height of 2m, and with velocity vector Vo=(Vox, Voy)?
- Can I know how to solve this physics question?
- A convex mirror of focal length 10cm is kept at a distance of 30cm front of a 4cm high object.Find the height of the image of the object?
- The displacement of a body is given by r=√(a^2-t^2)+tcos t^2, where a is constant. Find velocity?
- A sailboat is pushed with a linear drag coefficient 83 g/m by wind blowing at a speed 2.97 m/s, while being slowed by a quadratic drag with the still water of 105 g/s. What is the cruising speed of the sailboat?
- What is transformer?
- Question #d1832
- A black body has absolute temperature T and surface area A. The intensity of the radiation emitted by the body is I. Another black body of surface area 2A has absolute temperature 2T. What is the intensity of radiation emitted by this second black body?
- The particle p is released from rest at the top of a smooth plane inclined at angle a where sina=16/65.the distance travelled by P from top to bottom is S metres and speed of P at bottom is 8ms^-1 find S and hence speed of P when it has travelled 1/2S?
- Every 2 seconds, a coal fired power plant produces enough electricity to do 9X10^8 J of work. What is the plant's power output? *
- Can someone answer this physics question?
- A plane of mass 50000 kg requires a path of 1500 m to reach 180 km\hr find: the acceleration the engine force?
- For λ = 5.0 X 10^5m calculate the (i) fractional uncertainty in d. (ii) percentage uncertainty in d^2 ?
- If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person's acceleration?
- For derivation of equation for stationary wave, y1=Asin(kx-omega t) and y2=Asin(kx+omega t) are considered. Why y1=Asin (kx-omega t) and y2=Asin(kx+omega t+pi) cannot be used to derive?
- How do i do this simple harmonic motion?
- Solve the question ?
- A satellite is placed in synchronous orbit around an exoplanet of mass 44⨯10^24 kg and radius 18⨯10^6 m. If the planet's day is 87.8 hours, at what altitude should you place the satellite?
- Mechanic help?
- What is simple harmonic motion, types and characerstics?
- A plane flies at a speed of 350 miles per hour. How far will it travel in 3 hours?
- A squirrel jumps into the air with a velocity of 7 m/s at an angle of 20°. What is the maximum height reached by the squirrel?
- The wagons wheel revolves at 45 revolution per minute. the radius of the wheel is 30cm. what its linear velocity?
- In which condition time speed and time velocity graph are similar ?
- I am using V+E-Ir. But I can't get the answer yet as 05 or 0.6 ohm? How?
- What is mechanical energy?
- Urgent. Please help. Calculate the percentage uncertainty for the displacement when t = 40s?
- How do I found the value of b? The answer is 4.7×10^4 to 5.3×10^4
- What will be the resistivity of a metal wire of 2 m length and 0.6 mm in diameter, if the resistance of the wire is 50 Ω.??
- The total power output of the sun is 3.84x10^26w. What is the intensity of sunlight at a distance of 1.49x10^11m?
- How do I get the angle tita ? The answer is 22 degree for the angle. The ratio of T/T(zero) is 1.01. Is it from the graph? But how?
- If an object has a mass of 50 kg, what is its weight?
- A coffee maker heats 2 kg of water from 15 Celsius to 100 Celsius. how much thermal energy was required?
- Angular speed of hour hand of a clock in degree per second ?
- Is Electric potential and e.m.f are same or different terms?
- An automobile changes energy into different forms. The total amount of energy does not change due to the __________ ?
- A firework rocket takes off vertically with an acceleration of #20ms^-2# and maintains that acceleration for 5 seconds after which the rocket stops burning. Find (a), (b) and (c), below?
- As more lamps are put into a parallel circuit, the overall current in the circuit?
- An object of unknown mass M is moving at 5m/s when it collides with a spring that brings it to a stop in 3 seconds. As it does so the force of the spring as a function of tie is recorded in the graph below. What is the mass?
- Sound waves can travel through what types of mediums ?
- What is the explanation behind St. Elmo's fire?
- 7. An 8-gauge iron wire with n=1.7 x 10^29 m-3 is 1.99 mm in diameter d can carry a maximum current of 24 A. Find the drift speed of the electrons at this maximum current?
- Green light has a wavelength of 0.00000052 meters. Speed of light is 300,000,000 m/s. What is the frequency of green light waves and what is the period?
- What does the word refraction mean?
- A 20-kg girl and a boy on ice skates stand at rest facing each other. They push each other as hard as they can, and the boy moves to the left with a velocity of 2 m/s, while the girl moves to the right with a velocity of 3 m/s. (a) What is the boy's mass?
- You throw a football straight up into the air with a speed of 12.2 m/s. How high does the ball go?
- A 20 kg shopping cart moving at a velocity of 0.5 m/s collides with a store wall and stops. What is the momentum of the shopping cart?
- The speed of sound in air at 27degress is 340m/s.The speed of sound at temperature of 927degress is?
- 2 kg and 4 kg are held with a compressed spring between them. If the masses are released,. If the smaller mass moves off with a velocity of 6m/s, what is the stored energy in the spring when it is compress ?
- In nuclear fission, a nucleus of uranium 238, which contains 92 protons, can divide into two smaller spheres, each having 46 protons and a radius of 5.90 10-15 m. Find the acceleration of each nucleus at the instant in which fission occur?
- Ocean waves are hitting a beach at a rate of 3.5hz. What is the speed of the waves if the distance between wave crests is 1.3 meters?
- How much heat, in joules and in calories, must be added to a 75.0-g iron block with a specific heat of 0.449 J/g °C to increase its temperature from 25 °C to its melting temperature of 1535 °C?
- Mechanics, help?
- A particle moves along a line so that its displacement at time t≥ 0 is given by s(t)=2t^3-24t+1, where s is measured in meters and t is measured in seconds. At what values of t does the particle change direction? Thank you!
- What is science?
- How to find potential from 2 charges through 4 points?
- What is the ratio of momentum @ M and N? (No friction)
- Two charges #+1*10^-6# and #-4*10^-6# are separatd by a distance of 2 m. Where is the null point located?
- In a certan region of space the gravitaional field is given by -k/r where r is the distance and k is a constant. if the gravitational potential at r= a be v then what is the expression for gravitational potential ?
- In a shuffleboard game, the puck slides a total of 12m on a horizontal surface before coming to rest. If the coefficient of kinetic friction between the puck and board is 0.10, what was the initial speed of the puck?
- It is now known that protons and neutrons are themselves build out of elementary units called quarks. The up quark (u) has charge #+(2e)/3# and down quark (d) has charge #-e/3#. What can be the composition of proton and neutron?
- A moving object has the K.E=100 J and the momentum p=50 kgm/s. What is its mass?
- Any physics expert online? See the attachment below.
- A device operating at a potential difference of 1.5 volts draws a current of 0.20 ampere. How much energy is used by the device in 6.0 seconds?
- On a track of length 100km, the train covers first 20km with a constant speed 30km/hr. What should be the speed of the train for the next 70km so that the average speed of the train remains 50km/hr for the entire trip?
- If Chris throws the baseball 16 m in 4 seconds where is the average speed of the baseball?
- I tried using the formula. But I still didn't get the answer which is 1. How am I suppose to calculate please?
- What conditions are necessary for acceleration to occur?
- How is pitch controlled by frequency?
- A car is moving with a constant velocity 30m/s. What is the speed of the car after 10s?
- A box on the floor with a mass of 2 kg is under the effect of forces F1, F2 and F3 as it shows below. If the box moved a distance of 3 m. Calculate the work done on the box? HELP please.
- What two ideas are used to describe the motion of light?
- A pelican dives downward from a height of #35# #m# with an acceleration of #9.8# #m##/s^2# to grab a sardine at the surface of the ocean. How long does the dive take?
- A ball is dropped from a high rise platform at t=0 starting from rest.After 6s another ball is thrown downwards from the same platform with a speed 'v'.The 2 balls meet at t=18s.What is the value of 'v'?
- A car travels 600 m in 30 s. What is its average speed? Why is its actual speed usually different from its average speed?
- Vector #-hati+hatj-hatk# bisects the angle between vectors #3hati+4hatj# and #vecc# find #vecc#?
- Are they both right? why?
- In class we are learning about work; why does the force and motion have to go in the same direction?
- What will be the answer???
- Magnetic field question, please help?
- What kind of energy does the skier have at the top of a slope? Which forms of energy is it transforming into as the skier moves down the slope?
- What is the angle made by 3 i ˆ + 4 j ˆ with x-axis ?
- When a red filtered light is shown on a red flower, why does the leaves look black?
- The step-up transformer, is inincreases the input current or voltage?
- Maria bicycles 8 km/h faster than Carlos. In the same time it takes Carlos to bicycle 54 km comma Maria can bicycle 78 km. How fast does each bicyclist travel?
- Can you use Newton's third law to explain why a blown up but untied balloon will fly around the room when you let it go?
- An ideal gas is enclosed in container. Upon heating, which property of the gas doesn’t change? A) Volume B) Pressure C) Average speed of the molecules. D) The rate of collision of the molecules with each other
- Sound waves are two dimensional or three dimensional?
- A sound wave has a wavelength of 5.5 m in its travel through air at S.T.P with speed 330m/s. What is the wavelength of sound in the medium? where its speed is 1324 m/s.
- What does 80 Hz mean?
- If wheem is turning at 3.0rad/s,the time it takes to compelete one revolution? a) 0.33s b)0.67s d)2.1s
- If the index of refraction of a lens is 1.5, how fast does light travel in the lens?
- What quantity describes the ability of a force to rotate an object? How does it differ from a force? On what quantities does it depend?
- An airplane covers a certain distance at a speed of 320km/h in 7.5 hours. calculate the distance travelled by the plane in m/s?
- Why is the voltage across a bulb the same as the battery in a series circuit?
- The process in which Charles law is applicable is called a)isobaric b)isochoric c)isothermal process?
- If the atmospheric pressure is 101 kN/m^2 , what is the absolute pressure of water at depth of 12 m below the surface?
- The speed of a radio wave is given to be 300000000 m/s. The waves sent by the radio station "97.1 The Fan" have a frequency of 97000000 Hz. What is the wavelength of the radio waves?
- You start off from home and drive to your friends place. you left home at 2 pm, and arrived at her place at 2:40 pm. your odometer says that you have driven 25km. what was your speed in km/h?
- A person crosses a 174m long bridge in 45 seconds. what is his speed in km/h?
- An ideal gas is enclosed in a vessel of volume #V_0# fitted with a piston of cross-sectional area #A# and mass #M#. The piston is slightly depressed and returned. Find the frequency of vibration of the piston?
- A table clock has its minute hand 9 cm long. What is the average velocity of the tip of the minute hand (a) between 3 am to 3:30 am and (b) between 3 am to 3 pm?
- Why does resistance decrease when resistors are added in parallel?
- Could you please double check this answer and tell me where I went wrong?
- When a skydiver with a mass of 100kg is falling in a prone position (spread eagle) at terminal velocity (max speed) towards the earth. What is the magnitude of the drag force action on the skydiver?
- Any physics expert online? See the attachment. Thanks :)
- What are three examples of the Doppler effect in nature?
- Consider two displacements, one of magnitude 6 m and another of magnitude 8 m. What angle between the directions of this two displacements give a resultant displacement of magnitude (a) 14 m, (b) 2 m, and (c) 10 m ?
- Please explain ? Question 21.
- What is the force acting on an alpha particle traveling at 2V parallel to a magnetic field of strength 2B?
- I tried using change in momentum. How can I find Fmax?
- A bus is begins to move with an acceleration of 1 m/s2. A boy who is 42m behind the bus starts running at 10 m/s towards the bus. After what time bus will cross the boy?
- A 5500-kg freight truck accelerates from 4.2 m/s to 7.8 m/s in 15.0 s by the application of a constant force. What change in momentum occurs?
- A body is projected vertically from the ground.At a height of 20m the ratio of its potential energy and kinetic energy are in the ratio 1:3 .the height at which the above ratio becomes 5:11 is?
- .Convert these lengths to metres?
- A block of cubic zirconia is placed in water (n = 1.33). A laser beam is passed from the water through the cubic zirconia. The angle of incidence is 50 deg, and the angle of refraction is 27 degrees. What is the index of refraction of this cubic zirconia?
- How does the kinetic energy change when a liquid is cooled gradually?
- What is the value of m?
- A piece of ice (heat capacity #= 2100J kg^(-1 @)C ^-1# and latent heat #= 3.36 xx 10^5 J kg^-1#) of mass #m# gram is at #-5^@C# at atmospheric pressure. It isgiven #420 J# of heat so that the ice starts melting. Finally when the ..........?
- AP Test: Waves: Why is this answer correct?
- Could you please answer Q.5 ?
- 9. a fish rests on the bottom of a bucket of water while the bucket is being weighed when the fish begins to swim around in the bucket , how does the reading on the scale change?
- If a water wave has a wavelength of 1.0 m and a frequency of 2.0 Hz, how long will the wave take to travel 20. m from a boat to the shore?
- How can electrons in an atom be moving around the nucleus forever?
- A particle has an initial position vector of (−11 i + 15 j) m with respect to an origin O. If the particle moves with a constant velocity of (−10 i − 14 j) m/s, what will be its position vector after 9 seconds?
- A person walks 25.0° north of east for 3.10 km. How far due north and how far due east would she have to walk to arrive at the same location?
- At 10 am a ship is at location S, position vector (−6 i − 3 j) km, and is moving with velocity (2 i − 9 j) km/h. If the ship continues with this velocity what will be its position vector at 4 pm? position vector (km) =
- Help! Please?
- A .580kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. The velocity of the rock is 4.50 m/s. What the centripetal force acting on the rock?
- Two similarly charged spheres A and B separated by a distance 'r' with force of 2×10^-5N. A third identical uncharged sphere C is touched to A and then placed between a mid point of A and B. Calculate net electrostatic force on C?
- Gravitation question?
- What is period relating to light waves?
- A motorcycle of weight 2000N accelerates from 0 to 25m/s in 6 seconds. What are the magnitudes of a. acceleration? b. mass of motorcycle c. Net force causing the acceleration? (Hint: mass=weight/acceleration due to gravity(g)
- Find the binding energy of , whose atomic mass is 12.019 u?
- What was created first: energy or matter?
- Rectilinear motion 1.A car travels at 40km/hr for 2hrs, at 50km/hr for the next 3 hrs and finally at 30km/hr for 1hr. Find; a. The total distance traveled by the car in km b. The average speed of the car in km/hr and m/s?
- Given the electrical potential energy, how do you calculate electric potential?
- What is the solutions of the problems ?
- Is it true that all bodies and objects on the earth's surface are in circular motion due to the earth's rotation?
- A 2000 kg car travels at a speed of 20m/s. Find its kinetic energy?
- A 20kg mass travelling to the right at 4ms^-1 collides with a 4kg mass travelling to the left at 4ms^-1. 1)What is their total momentum? 2)If the two mass stick together when they collide, what is their final velocity.
- Electricity problem..... please can you solve this...?
- Explain why it is dangerous to run a generator in a closed room?
- For the Fraunhofer diffraction to occur, the wave front incident on the aperture must be? 1) spherical 2) plane 3) cylindrical 4) elliptical
- When monochromatic light shines perpendicularly on a soap film (n= 1.35) with air on each side, the second smallest nonzero film thickness for which destructive interference of reflected light is observed is 296 nm . What is the wavelength of the light ?
- Find the distance of the image when an object is placed on the principle axis at a distance of 10cm infront of a concave mirror whose radius of curvature is 8m?
- How do to solve this sankey diagram?
- On the earth, 49 degrees of latitude is how many kilometers? how many miles? (Assume that the radius of the earth is 6400 km, or 4000 mi, approximately.)
- Initial horizontal velocity?
- The mass and diameter of a steel ball were used to determine its density the mass was measured within 1% dm3 the diameter within 3% what is the percentage error in the calculated density of the steel?
- I have 5 components: component 1 uses 15mA at 5V component 2 uses 66mA at 3V component 3 uses 20mA at 5V component 4 uses 40mA at 7V component 5 uses 9mA at 5V What is the power consumption?
- A signal is broadcast at a resonant frequency of 1 MHz, if the circuit has a 100 pF capacitor what inductor value do they need to receive this resonant frequency? Give your answer in μH.
- You are watching a meteor shower. You notice that some of the "falling stars" are green, and others are blue. What does this tell you about the meteors that are involved in the storm?
- How much power is used if a force of 35 Newton’s is used to push a box a distance of 10 meters in 5 seconds ?
- An approaching storm is moving at 15 km/hr. What do you need to know to determine its velocity?
- When I create an wave on a string by striking or, plucking, how an another wave of same time period, frequency but of different sign create itself which results to the formation of the stationary wave?
- Find the values of *F* and #theta#?
- A car coasts up a hill. As it climbs, it slows down. Which type of energy is the car losing as it goes up?
- Which law states that when one object exerts a force on a second object, the second object exerts a force on the ﬁrst that is equal in strength and opposite in direction?
- What is the primary:secondary turns ratio of this transformer ?
- The linear momentum of a particle of mass 1kg and kinetic energy 2J?
- The substance as a result of the chain of transformations loses one α_ and two β- particles and becomes U(234,92). Find the initial radioactive element ?
- Give reason ?
- What is the wavelength of radio waves that have a frequency of 530 kHz (5.3 × 10^5 Hz) and a speed through air of 3.00 × 10^8 m/s?
- Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why?
- The gravitational force exerted on a baseball is #-F_ghatj#. A pitcher throws the ball, initially at rest, with velocity #v hat i# by uniformly accelerating it along a horizontal line for a time interval of #t#. What force does he exert on the ball?
- At a particular instant in the flight the glider is losing 1.00 m of vertical height for every 6.00 m that it goes forward horizontally. At this instant, the horizontal speed of the glider is 12.5 m s–1. Calculate the velocity of the glider?
- What is electricity?
- If we burn a piece of paper using a small flame of match stick, the flame, that is heat and light released from the reaction increases.where do these heat and light energies come from?(energy can be created)
- An iron piece get heated faster than water even though same amount of heat energy is applied in both.why?
- Physics question?
- How does conduction, convection and radiation work to transfer heat from an electric radiator in your bathroom?
- Can anyone prove the formula of volume expansion coefficient and the compressibility for van der Walls gas ?
- A driver is driving around a circular track at a speed of 45 m/h. How is the driver's velocity compared to his acceleration?
- Two waves are having a constant phase difference does it means the two waves can be out of phase 180 with respect to one another ?
- Why is it that in a rainy day a weak wind was able cause a coconut tree to fall ?
- Airplane traveling at 75m/s with a kinetic energy of 843700j?
- If you accidentally drop a 50p coin (0.01kg) from the top of the shard (308m). How fast will it be travelling when it hits the ground?
- What is the height of the platform?
- Kingda ka at six flags has a 55m drop. The rollercoaster has a mass of 8000kg. How fast it be travelling when it reaches the bottom?
- A 2.5-kg book slides horizontally and falls from a shelf 3.0 m above the floor. How much work does the force of gravity do on the book as it falls 3.0 m?
- Bird flying towards its nest with a mass of 0.25kg and a kinetic energy of 40.5j?
- Automatic door closing 0.2m/s,with a kinetic energy of 1.6j?
- Consider the LC circuit. If one needs to tune this circuit to a frequency of 84 kHz, and the capacitor has a capacitance C = 3.0 mF, what inductance L is needed?
- Why do most coloured plastics change colour when bent too much?
- How do you find the density of a fluid?
- The frequency of the first harmonic standing wave in a pipe that is open at both ends is 200 Hz. What is the frequency of the first harmonic in a pipe of the same length that is open at one end and closed at the other?
- What is the amount of energy liberated in joules when 85 g of water cools from 45 C to 25 C.?
- How to convert from N.s/m^2 to N.s/cm^2 ????
- If an elephant were chasing you, its enormous mass would be very threatening. But if you zigzagged, the elephant's mass would be to your advantage. Why?
- 5. If the four-wheeler has a top speed of 25 mph, will Stanley and his friend be able to use this method to determine if the whistle is functioning?
- A refrigerated truck has a dimension of 12m*2m*3m. The cargo space at the refrigerated truck is to be cooled from 25(oC) to 6(oC). The heat lost by transmission is 1kJ/s and the power input of the refrigeration system is 10kW?
- A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and fish is 12 below the surface , find the radius of the circle in cm?
- A wave along guitar string has a frequency 540 Hz and a wavelength of 2.5 meters. Calculate the speed of the wave?
- Supose that you need 2 Joules to expand a spring from its natural length of 30 cm to 42 cm: A)How much work its required to expand it from 35 to 40 cm? B)How long will expand from its natural length if a force of 30N is aplied to it?
- A diver used 6000 J to dive off a rock cliff. If the diver took 2.5 seconds to reach the water, how much power was used?
- A horizontal force is applied on a body on a rough horizontal surface produces an acceleration#a#. If coefficient of friction between the body and surface which is #u# is reduced to #u /3#, the acceleration increases by 2 units. What is the value of #u#?
- A truck pulls boxes up an incline plane. The truck can exert a maximum force of 4,000N. If the plane's incline is #(5π)/8# and the coefficient of friction is #9/8#, what is the maximum mass that can be pulled up at one time? Thanks
- What is the highest order spectrum which may be seen with monochromatic light of wavelength 600 nm by means of a diffraction grating with 5000 lines/cm ?
- A photon and electron have got same de borglie wavelength prove that the energy of photon is 2mclamda/h of the kinetic energy of electron??
- Help me anyone on physics?
- An airplane accelerates down a runway at 3.20 m/s_2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff?
- If you need 6 joules of work to expand a spring from 10 to 12 cm and another 10J to expand it from 12 to 14 cm. Wich is the natural lenght of the spring?
- A ball is dropped from a height of 64 feet. It's height, in feet, can be modeled by the function h(t)=-16t^(2)+64,where t is the time in seconds sonce the ball was dropped. After how many seconds will ball hit the ground?
- A river boat travels from port A to port B, a distance of 15.0 km downstream, in 1 hour 40 minutes. The return journey takes 2 hours 30 minutes. Calculate: (a) the boat speed relative to the water? (b) the speed of the river?
- The vector #vec A# is on a coordinate plane. The plane is then rotated counterclockwise by #phi#. How do I find the components of #vec A# in terms of the components of #vec A# once the plane is rotated?
- A golf ball is hit in the air with an upward velocity of 45ft from the top of a building of 50ft.(t)=16t^2+45+50 Round to the nearest tenth?
- A car experience a displacement of 40km in 20 min. What is the average velocity in m/s?
- (PHYSICS HELP!) Two cars have identical horns, each emitting a frequency of fs = 409 Hz. One of the cars is moving with a speed of......?
- What does the d stand for in the equation s equals d/t ?
- A heater is marked 50 watts will evaporate at 0.05kg of boiling water find the specific latent heat of vaporization of the water?
- In the figure, each resistance is of 10 ohms. The equivalent resistance between P and R is ?
- A 0.45-kg football traveling at a speed of 22 m/s is caught by an 84-kg stationary receiver. If the football comes to rest in the receiver's arms, what is the magnitude of the impulse imparted to the receiver by the ball?
- A paddock on level ground is 2km long and 1km wide. If a farmer walks from one corner to the opposite corner along the fences in 40 minutes, how long will it take him walks across the diagonal?
- Paul drove for one and a half hours at 65 mph before he realized he had forgotten his wallet. How far was he from home?
- Question: A 3kg block is attached to an ideal spring with a force constant k = 200N/m. The block given + + direction of magnitude u = 12 m/s. Find a. The amplitude b. The phase angle c. Write an equation for the position as a function of time?
- What is the linear speed and centripetal acceleration of point X?
- Give some example of scattering of light that we come across in day to day life ?
- A block of charge q and mass m is connected to a spring of constant k. An electric field E exists parallel to the ground. The block is released from rest from a unstreched spring. Find Maximum displacement?
- A rocket accelerates at a rate of #30# #m##/##s^2# for #2# minutes. What is its change in velocity?
- A sound wave with a high amplitude are ?
- Its question about fixed pulley?
- Two airplanes leave an airport at the same time. The first flies #(210 " km")/("hr")# in a direction of #290^@#. The second flies #(180 " km")/("hr")# in a direction of #185^@#. After 3 hr, how far apart are the planes?
- A bicycle moves with a constant velocity of 5 km/hr for 10 mins and then decelerates at the rete of 1 km/h till stops. Find the total distance covered by the bicycle?
- How does increase in mass of a body affect its inertia?explain
- A bulb used in a car is rated 12 V , 48 W . find the energy consumed in one minute when the bulb is connected to 6 V battery?
- If the velocity of the wave is 200 m/s, what is the frequency of the wave?
- A ball is thrown upward from the roof of a 25m building. The ball reaches a height of 45m above the ground after 2s and hits the ground 5s after being thrown. What is the equation for this function?
- What is the force, in terms of Coulomb's constant, between two electrical charges of #12 C# and #-7 C# that are #4 m # apart?
- How to prove #m=m_0/(sqrt(1-(v^2/c^2)))?#
- How can you tell that the magnetic field gets weaker farther from the magnet?
- You have three resisters of 9 ohm each . how can you combine them to get a resistance of 12 ohm?
- The driver of a car traveling at 36 km/hr applies the brakes to decelerate uniformly. The car stops in 10 sec. Plot the speed-time graph for this period. Find the distance travelled by the car during this period by calculating the area under the graph?
- An body with a mass of #6 kg# is on a slope at an incline of #pi/5 #. If the body is being pushed up the slope with a force of # 4 N#, what is the minimum coefficient of friction required for the body to remain at rest?
- Number of molecules per unit area at the surface of water?
- In a Young’s double slit experiment two rays of monochromatic light emerge from the slits and meet at a point on a distant screen.The point on the screen where these two rays meet is the eighth order bright fringe...?
- A train whistle blows every 10 seconds. What is the frequency of the whistle?
- Two 6.6 kg bodies, A and B, collide. The velocities before the collision are A = (32 i + 41 j) m/s and B = (31 i + 3.2 j) m/s. After the collision, velocity of A = (7.9i + 11 j) m/s. ?
- The position vectors of p and q are p=i-3j and q=4i+5j respectively. Find the unit vector parallel to pq .?
- 2 litres of water have have reached the temperature of 103°C, without beginning to boil. However after throwing in a small piece of ice (with insignificant mass), the water began to boil. What is the mass of water that transformed into water vapor?
- Engineering Electromagnetics. How about solution?
- A cell is connected in series with a resistor and supplies a current of 4.0 A for a time of 500 s. During this time, 1.5 kJ of energy is dissipated in the cell and 2.5 kJ of energy is dissipated in the resistor. What is the emf of the cell?
- The resistivity of copper is 1.7 X 1O^-8 ohm m. What length of copper wire of diameter 0.1 mm will have a resistance of 34 ohm?
- Object A emits more light than Object B. Would it be fair to say that the more luminescent object (Object A) is emitting <em>more high energy photons<em> than Object B? If so, why? If not, why not?
- A 13.1 eV photon is emitted from a hydrogen atom. What is the Balmer formula n value corresponding to this emission? What is the Balmer formula m value corresponding to this emission?
- A player hits a table tennis ball with a force of 25N. The mass of the ball is 0.027 kg. What is the acceleration of the ball in meters per seconds squared?
- Convert 0.0075km squared to m squared?
- Why are loud sounds dangerous?
- Your family is moving to a new apartment. While lifting a box 1.5 m straight up to put it on a truck you exert an upward force of 200 N for 1.0 s. How much power is required to do this?
- A net force of 10.0 N is exerted by Irene on a 6.7-kg cart for 3.0 seconds. What is its acceleration?
- What is the proof of# E=mc^2#?
- A net force of 10N acts on a mass of 25kg for 5 seconds. What is the acceleration?
- 'How do I find the angle between a vector and the y-axis?'
- What are differences between parallel and series circuit .?
- The modulus of a vector A=5i+PJ+4√2k is 11 the value of p is?
- The radius of curvature of the convex surface of a planoconvex lens is 95,2cm.The lens is placed convex side down on a perfectly flat glass plate that is illuminated from above with red light having a wavelength of 580 nm ...?
- What is light year? express in terms of SI unit.
- It is question about finding distance from velocity time graph?
- Explain why an atom is neutral ?
- How to do this through lami theorem?
- A ball is tossed vertically upwards with a speed of 5.0 m s–1. After how many seconds will the ball return to its initial position?
- How does warmer temperatures affect takeoffs?
- It is about finding kinetic energy want help in part 1 not part 2 in part 1 please tell how to find velocity?
- What is the mass if A force of 350N is applied in the object making it accelerates at the rate of mass per second squared?
- State the coulombs laws of electrostatics?
- A capacitor of 10 micro farad stores a charge of 3.5C is set for discharging through a 100 kilo ohm resister, the charge on the capacitor after 1 second will be?
- If the difference between the frequencies of two tuning forks is n number of beats produced in two seconds are a)n b)2n c) 3n ?
- A mass attached to a spring of spring constant 200N/m undergoes a simple harmonic motion. If the mass is 2kg, what is the period of the oscillation?
- Why is graphite a good conductor of electricity but not diamond?
- Can someone pls show me the VR (Voltage-Resistance) Graphs for an NTC thermistor, filament lamp and conductors?
- Help with capacitor question?
- A ball is thrown horizontally from the top of a building. How far will the ball fall in 2.00 seconds?
- What is the kinetic energy of an object with a mass of 10 kilograms traveling at a speed of 10 m/s? Assume no other forces act upon the object.
- Jill is out for a walk. How much gravitational potential energy does she gain when she heads to the top of a hill 20 m tall? Jill is 55 kg.
- Two tourists left two towns simultaneously, the distance between which is 38 km, and met in 4 hours. What was the speed of each of the tourists, if the first one covered 2 km more than the second one before they met?
- What is the wave speed if the wavelength is .5 m and the frequency is 50 Hz?
- A 10kg object is 10m in the air, what is the potential energy?
- Three point charges of +2q, -q and -q are placed at the corners A, B and C of an equilateral triangle ABC of side ‘x’. What is the magnitude of the electric dipole moment of this system?
- A particle starts at a position 2 meters from you and moves past you in 10 seconds to a position 5 meters from you. What is the particle's velocity?
- What is the diffrence between electric field intensity and electric field?
- Please solve q 12?
- Work out? The maximum range of projectile is 3000M.what would be its range when it is launched at an angle of 150 with the horizontal? Thanks
- 1 Joule of energy is to be converted into new system of units in which length is measured in 10 metre, mass in 10kg and time in 1 minute. The numerical value of 1joule in the new system is?
- The wavelength of a specific photon in the infrared spectrum is 4 x 10^6 meters. Given that the speed of light is 2.998 x 10^8 m/s, what would be the frequency of this infrared wave?
- Its question about velocity time graph?
- What is moment of inertia? How to calculate it's value for different bodies? plz explain!!
- The half-life of a radioactive element is 5.0 days. A freshly-prepared sample contains 128 g of this element. After how many days will there be 16 g of this element left behind in the sample?
- What is the weight of a 67.0-kg person who is running with a speed of 10.0 m/s?
- Years ago the barges that traveled along the canals were dragged by horses. Suppose that the horse is exerting a force of 7900 N at an angle of 18 degrees with the direction of movement of the barge, which is sailing in a straight line through the channe?
- Please solve the q 195?
- If a ball is thrown downward from the top of a building with initial velocity of #10 "m"/"s"# and strikes the ground with a speed of #60 "m"/"s"#, how tall is the building?
- For a questions(Comprehension) of Mechanics refer a photo below.?
- What happens to the force of attraction when: 1. Distance is doubled 2. Masses are doubled 3. Distance is reduced by half ?
- Why do different substances have different viscosities?
- A boy runs 800m northwards, followed by 600m westwards. What is the magnitude of his distance and displacement ?
- What is the meaning of SONAR(Sound Navigation and Ranging?
- The angular speed of an automobile engine is increased from 1200 rev/min to 3000 rev/min in 12 s. (a) What is its angular acceleration, assuming it to be uniform? (b) How many revolutions does the engine make during this time?
- Please solve q 69?
- How to solve this physics question?
- Please solve the q202 ?
- How do you differentiate between 1D motion and 2D motion?
- Please solve the q194 ?
- Does mass change when a matter undergoes state change?
- A certain light truck can go around a flat curve having a radius of 150m with a maximum speed of 32.0 m/s. With what maximum speed can it go around a curve having a radius of 75.0m?
- What is the wavelength (in cm) and the period (in seconds)?
- What's the force on charge Q3? Thank you!
- What mass of steam at #100^@ C# must be mixed with #150 g# of ice at its melting point, in a thermally insulated container to produce water of #50^@ C#?
- Compared the redlight, green light has greater?
- The echo of a ship's fog horn, reflected from an iceberg, is heard 8.0 seconds after the horn is sounded. How far away is the iceberg?
- A problem about the motion of planets?
- The athletics track consists of a rectangle and two semi-circles. inside the track there is a VIP SECTION 20M LONG AND 15M WIDE. during a 6 km race evenner ran 8.05 rounds before fainting. how many km (three decimal places) did she run?
- Someone explain?
- If #s=ut+1/2at^2#, #t=#?
- Calculate the acceleration of a body of 250g when acted by a force of 1 newton?
- Heat is transferred from the heating element to the pot to the boiling water. What is the MOST likely method of heat transfer?
- Please solve q 99?
- A 1.0 kW heater supplies energy to a liquid of mass 0.50 kg. The temperature of the liquid changes by 80 K in a time of 200 s. The specific heat capacity of the liquid is 4.0 kJ kg–1K–1. What is the average power lost by the liquid?
- An inductor stores u energy and I current is passed through it and dissipate energy at the rate of P.The time constant of the circuit,when this coil is connected across a battery of zero internal resistance?
- What is the capacitance such that the current through the circuit is a maximum?
- Calculate the speed of a car that travels 150m in 88 seconds ?
- Ice cubes of total mass 6.00 grams have temperature -4.0°C, and are placed in 50.0 grams of water at 20.0°C in an insulated foam cup. the equilibrium temperature of the water inside the cup? READ DETAILS, TOO.
- A particle begins to move with a tangential acceleration of constant magnitude #0.6m/s^2# in a circular path. If it slips when it's total acceleration becomes #1m/s^2#, then the angle through which it has turned before slipping is?
- A swimmer speeds up from 1.1 m/s to 1.3 m/s during the last 20 s of a workout. What is the swimmer's acceleration during this time interval?
- How can a dipole exist? How can the two charges stay stable at a finite distance? Thank you
- Physics Help?
- Two masses, m1 =1.9kg and m2= 1.4kg, are attached by a string passing over a pulley as shown in the diagram below. The angle of inclination is theta= 25 degrees. The system is set in motion, and the masses travel a distance h= 1.3m at a constant speed?
- Si unit of potential energy?
- Please solve q 74?
- The speed of sound is 340m/s the highest note on a piano has a frequency of 4186Hz what is it’s wavelength?
- Please solve q 77?
- helpme please: A spring of 3 fts requires a force of 10 pounds to stretch it to a length of 3.5 fts a) Find the work required to stretch the spring from its natural length to a length of 5 fts?
- A man travels 370 km partly by train and partly by car. If he covers 250 km by train and rest by car, it takes him 4 hours. But if he travels 130 km by train and the rest by car, he takes 18 mins longer. Find the speed of train and that of car?
- How to find momentum when kinetic energy increase or decrease?
- The distances of two planets from the sun are 10^12 m and 10^10 m respectiuely. Then the ratio of time periods of those planets is____?
- Why cann't vectors cannot be added algebraically?
- If a transformer consist of #770# turns in primary coil with #220# primary voltage produces #110# secondary voltage, then calculate the number of turns in secondary coil?
- I am trying to push start a car which has stopped. If the biggest force with which I can push the car is 420N, and the car has a mass of 1025kg, how fast will it be going after 8.0s of pushing?
- Why we use #mu_0# for air when calculating the magnetic flux density inside an electric cable where (r<R) instead of the permeability of the metal core #mu#. #" "# #B=(mu_0Ir)/(2piR^2)#?
- Derived the s1 units of force,pressure and density?
- What causes the pitch to change of a siren to change as it goes by you? How is frequency related to pitch?
- A water balloon with a mass of 500 g is launched across a waterpark and lands 150 m away 5 seconds later. What is the initial velocity in the x and y directions, launch angle, and max height?
- What is conserved when two objects collide in a closed system?
- A wave of frequency 500 hertz travel between two points P and Q with velocity 300 metre per second. How many wavelengths are there in PQ if length of PQ is 600 metre?
- How much secs? (physics)
- According to the Law of Conservation of Energy, a golf ball with 100 Joules of gravitational potential energy at its maximum height will have how many Joules of kinetic energy right before it hits the sand when it is dropped?
- A body is charged to a certain potential.When an additional charge of 60nC is imparted to it ,rise in potential is found to be 15 mV .Find the capacitance of the body?
- Calculate the heat required to change 76g of water at 23c to 100c?
- What is the frequency of this radiation?
- What is the fastest thing on earth?
- Particle travels 10m in 5sec and 10m in 3sec assuming constant acceleration what is the distance travelled in next 2sec? Ans:8.3m
- Help please?
- A ball of mass 0.5 kg is projected vertically upwards if its velocity at 4m high is 3 m\s find the potential energy and kinetic energy given that the acceleration due to gravity =10 m\s^2?
- A force of 20 N gives a ball an acceleration of 4.0 m/s^2 on a level frictionless surface. What is the mass of the ball?
- Why do 2 bodies of different masses fall at the same rate?
- True of false: A person that throws a baseball will be pushed by the baseball?
- What is the force of friction between a block of ice that weighs 930 N and the ground if #mu# is 0.12?
- A particle moves in x-y plane according to rule x = a sin ωt and y = a cosωt. What kind of path does the particle follow ?
- Can anyone give me some information on how nuclear energy is more beneficial than other types (GCSE level please :) ?
- An arrow is shot at 33.0 above the horizontal. Its velocity is 48 m/s, and it hits the target. What is the maximum height the arrow will attain? The target is at the height from which the arrow was shot. How far away is it?
- If you sit on a moving bus and toss a coin straight up into the air, where will it land?
- How to find out the breakdown voltage?
- Can you create electricity with a magnet?
- The frequency of a wave is #5.1*10^14# #Hz#. The speed of a wave in a certain medium is #2.1*10^4# #m##/s#. What is the index of refraction of the medium?
- Which of the fundamental forces is the stronger force?
- Find the simplified expression of the following circuit using K Map?
- What would be the kinetic energy?
- Find the maximum amount of water that can flow through 3 cm i.d.pie per minutes without turbulence .Take the maximum Reynolds nomber for nonturbulent flow to be 2000?.for water at 20 c, viscosity=1*10^-3 pa.s Ans;0.0028 m^3
- A car initially at rest undergoes uniform acceleration for 6.32 seconds and covers a distance 120 meters. What is the approximate acceleration of the car?
- Why are the electric field lines between two unparallel metal plates curved? Can't they be straight?
- Circular Loop Question?
- What is the tension in the rope? And the horizontal and vertical forces exerted by the pivot?
- Laci uses her 1.8-kilowatt hair dryer for 0.25 hour each to dry her hair? How much electrical energy does she use each day to dry her hair?
- Fuel oil density #820" kg/m"^3# flows through a venturi meter having a throat diameter of 4.0 cm and an entrance diameter of 8.0 cm. The pressure drop between the entrance and the throat is 16 cm of Mercury. The density of mercury is #13600" kg/m"^3#?
- A woman on a bike accelerates from rest at a constant rate for 10 seconds, until the bike is moving at 20m/s. She maintains this speed for 30 seconds, then applies the brakes to decelerate at a constant rate. The bike comes to a stop 5 seconds later.help?
- When we use this laws?
- Is light a particle or wave? Why?
- Water is under 122.5m . When a stone throw sound is heard after 5.36 second .so what is the velocity of sound?
- The force applied against an object moving horizontally on a linear path is described by #F(x)=e^x+ x #. By how much does the object's kinetic energy change as the object moves from # x in [ 1, 3 ]#?
- How does a refractive index of water compare with that of glass?explain
- Please solve it?
- Katie and her best friend Liam play tennis every Saturday morning. When Katie serves the ball to Liam, it travels 9.5 meters south in 2.1 seconds. What is the velocity of the tennis ball?
- Does superposition of waves require the two waves to have the same speed and frequency?
- How do you solve this if mass isn't known??? (Forces question)
- A boy makes a ruler with graduations in cm in it. To what accuracy this ruler can measure? How can this accuracy be increased?
- Gloria is designing an experiment to investigate how different kinds of wheels accelerate down a ramp. Which is the dependent variable?
- In a circuit, the supplied voltage is 1.5 volts, and the resistor value is 3 ohms. What is the current in the circuit?
- Please help ASAP. I don't understand: Consider a light ray traveling from medium 1 to medium 2 with medium 2 extending downward indefinitely. Let the index of refraction of medium 1 be 1.0...?
- 800g.flask of water is heated from 20'C to 85'C, how much heat (in joules) did the water absorb?
- What is the primary pitch instrument when establishing a constant altitude standard-rate turn?
- How long it will take for 500ml of water to flow through a 15cm long 1.5mm radius if the pressure differential across the pipe is 4kpa?the viscosity of water is 0.8 cpoise. Ans=7.5s
- How many excess electrons are on a ball with a charge of -5.00 X 10 negative 17 C?
- A cube of wood floating in water supports a 200-g mass resting on the center of its top face.when the mass removed the cube rises 2-cm.determine the volume of the cube? Ans: 1000 cm^3
- One example of acceleration?
- As above, a particle has velocity v(t)= #3t^2-2t-1# measured in m/s. Compute total distance traveled over [0,2] in meters?
- What is the coefficient of friction?
- A tank containing oil of (sp gr=0.8) rests on a scale and weighs 78.6 N .By mean of a wire,a 6.0 cm cube of aluminum, (sp gr=2.7) is submerged in the oil? . Find a) the tension in the wire b)the scale reading none of the oil overflows Ans; (a) 4N (b)80N
- Convert 10 metric tons to grams? 3 days to sec 100km to mm 20 miles to m 200lbs to kg
- Please help me figure out question 1?
- A dog has a momentum of 60 kilogram meters per second west. The dog has a velocity of 3 meters per second west. What is the mass of the dog?
- Variable acceleration?
- A ball is thrown with an initial speed at an angle with the horizontal the horizontal range of the ball is R and the ball reaches a maximum height R/6. In terms of R and g find the time interval during which the ball is in motion?
- In a blood transfusion,blood flow from a battle at atmospheric pressure into a patient vein in which the pressure is 20mmHg higher than atmospheric.The bottle is 95cm higher than the vein and the needle into the vein has length of 3cm and diameter 0.45mm?
- Find the magnetic field at the point O center of the circle with R=20 cm if the current is I=100A ?
- If an object weighs 500N and you lift it 2m how much work have you done on it?
- Help me with this question?
- Could you please solve question c i) and c ii) ?
- A worker does work of 360 J against a friction force of 20 N in pushing a body with a uniform velocity for 4.5 s find the value of velocity?
- How is light formed?
- Your body applies force to the ground as weight. If you weigh 450 newtons and carry a backpack that weighs 45 newtons, what is the net force applied downward to the ground?
- The half-life of a certain radioactive isotope is 6 hours. If we start out with 100 grams of the isotope, how many grams will be left after 1 day?
- While on planet Soccerball, an object is thrown vertically upward with an initial velocity of 5.0 m/s. If this object returns to the point of release in 3.0 s, what is the acceleration of a free falling object on this planet?
- A 100-Hz sound wave has a wavelength of 4 meters. What is the speed ?
- An electron of kinetic energy 0.45 KeV moves in a circular orbit perpendicular to a magnetic field of 0.325 T. Find (a) the radius of the orbit and (b) the frequency and period of the motion ?
- If 10^9 electrons move out of a body to the another body every second, how much time is required to get a total charge of 1 C on the other body?
- A lamp is plugged into a standard 120-volt outlet. If the lamp draws a current of 0.5-amps, how much energy is consumed in 1 minute?
- A wire 0.4 m long and carrying an electric current of 2.5 A is located in a uniform magnetic field in which B=0.01 T. Calculate the force on the wire when it makes an angle of 60 degrees with the field direction ?
- The volume of a fixed mass of gas at 760 mmHg is 1500 cm^3. what is the pressure if the volume is reduced to 1000 cm^3 at constant temperature?
- (a) Find the velocity of Q relative to P. (b) Find the value of λ if P and Q collide. (c) If λ = −1/2, find the shortest distance between P and Q.?
- A particle moves along the x-axis according to the #x = A(1+sinomegat)#. What distance does it travel between t = 0 and #t = (2.5pi)/omega#?
- A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is the car's acceleration?
- An unstretched spring has a length of 10 centimeters. When the spring is stretched by a force of 16 newtons, its length is increased to 18 centimeters. What is the spring constant of this spring?
- A -0.06 C charge that is pointing downward is placed in a uniform electric field with a strength of 200 N/C. What is the magnitude and direction of the force on the charge?
- Calculate the magnitude of the magnetic field at a point 100cm from a long thin conductor carrying a current of 1A ?
- A metal sphere has a charge of –6 mC. When 5 × 1012 electrons are removed from the sphere, what would be net charge on it?
- Light is refracted through a diamond. If the angle of incidence is 38 ◦, and the angle of refraction is 16 ◦, what is the index of refraction?
- Can someone help me with this question as fast as possible plz ?
- What is the gravitational force of attraction between two bodies of masses 1500kg and 8500kg which are 2.6km apart?
- How is solid angle related to electric field according to Gauss's Law?
- Variable acceleration?
- A 95 kg student slides down a waterslide that is 13 m high. How fast is he going at the bottom?
- What quantities determine the torque on an object?
- Variable acceleration?
- Find the net resistance in the second diagram (right in the centre of the image) with explanation?
- Please solve q 51?
- Please solve q 61?
- Please solve q 49?
- A stick figure is pushing three boxes across the screen. The mass of the blue box is 74kg, the mass of the red box is 86kg and the mass of the yellow box is 16kg. How hard does the stick figure have to push to get the boxes moving, if μs is 0.92?
- A battery can create a #8 V# emf across its terminals. If this battery powers a circuit that requires #1.7# amps for #4# minutes, how much chemical energy is lost by the battery during this time?
- A man standing in the roof of a building which is 100 meters high throws a ball vertically downward with an initial velocity of 20 m/s.The acceleration due to gravity is 9.8m/s/s.What is the velocity of the ball aftre it has been falling for 1.5s?
- Write an expression for the work done by the spring? (Physics)
- 2 identical pendulums A&B are suspended from same point.The bobs A&B are given positive charges q1 and q2 (q1<q2). If A&B are making angles $1 and $2 with the vertical and T1 and T2 are tensions in the string respectively.Then prove that $1=$2 and T1=T2?
- Which results in a larger attractive force on a single electron:+3C of charge1.0 m away,or +6c of charge 2 m away?Numerically justify your response?
- If a weight scale shows that you weigh 200 kg on the surface of the Earth, and then you skydive with both of you feet attached to the scale, what will you read a weight of?
- If a 5.00x10^2W heater has a current of 4.00A, what if the potential difference across the ends of the heating element?