Answers created by A08

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• What is the difference between t = 0 and t = 1 seconds?
  
• An egg is thrown horizontally off a roof, which is 60 meters high, with an initial velocity of 6.5 m/s. How long does it take to hit the ground, and how far does it go in the x direction?
  
• The angle made by resultant vector R=2underroot3i-2j with x axis is?
  
• 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?
  
• 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?
  
• A 2.0m rectangular uniform slab of concrete is supported on 7 cylindrical rollers. If the slab is pushed to the right, how far can it move before it's center of gravity is to the right of the 7th roller, at which point it tips?
  
• 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?
  
• Electron,proton, neutron and alpha particle have same momentum which particle has more kinetic energy?
  
• 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#
  
• 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?
  
• What is the option?
  
• The max value of 4sin^2x+3cos^2x is Options are 4,3,7and 5?
  
• 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?
  
• 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?
  
• 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?
  
• 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?
  
• Question on gravitation?
  
• How long will it take the sound pulse to travel out and back?
  
• 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?
  
• How do you find the reference angle of #theta=3.5# and sketch the angle in standard position?
  
• An electron and a photon have same wavelength #lambda#, what is the ratio of their kinetic energies ??
  
• What is the electric potential energy in II?
  
• 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
  
• One of the strings of a guitar has a fundamental frequency of 440 Hz and another has a fundamental frequency of 660 Hz. Which of the following set of frequencies could be produced on both of these strings?
  
• 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?
  
• Why is acceleration due to gravity constant?
  
• What will be the answer?
  
• If the rod makes one revolution every 0.736 s after the puck is caught, what was the puck's speed just before it hit the rod? (See details).
  
• 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. ?
  
• 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) 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?
  
• As the string passes through the vertical, the narrow beam of light is interrupted by the cylinder for 22 ms . The cylinder has a diameter of 2.5 cm. How to calulate the actual speed of the cylinder?
  
• Ok can someone help me with a GAMSAT question on mechanical and gravitational energy?
  
• 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?
  
• Veronica angrily throws her engagement ring? (See below)
  
• 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 ?
  
• 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?
  
• 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 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?
  
• Please solve q 69?
  
• Precalculus- finding torque using cross products?
  
• What is the formula for speed of pendulum at any point?
  
• 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?
  
• Three large metal plates are arranged as shown. How much charge will flow through the key if it is closed ?
  
• 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?
  
• Under what condition does a particle experiencing electric force perform simple harmonic motion?
  
• Why is this capacitor useful?
  
• 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?
  
• How to find the final equilibrium temperature, when a hot iron mass is placed in water?
  
• 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)?
  
• The rms speed of smoke particles of mass 50*10-15kg at NTP will be??
  
• 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?
  
• How to find the final equilibrium temperature, when a hot iron mass is placed in water?
  
• 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 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 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?
  
• 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 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?
  
• Why would tension be smaller if the string were parallel to the lab bench?
  
• 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?
  
• 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?
  
• 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
  
• Calculate the relative permittivity of a KCl crystal at optical frequencies?
  
• 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).
  
• Index of refraction?
  
• 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?
  
• Sarah can paddle a rowboat at 6 m/s in still water. She heads out across a 400 m river at an angle of 30 upstream. She reaches the other bank of the river 200 m downstream from the direct opposite point from where she started. Determine the river current?
  
• 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?
  
• 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 is the change in the object’s velocity from t=4 to t=10?
  
• What is the heat of fusion of mercury in J/kg?
  
• 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)?
  
• 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 result of mixing 1kg ice at 0°c with 100kg steam at 100°c? Solve
  
• 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?
  
• 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 ?
  
• 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)
  
• Nuclear Chemistry and Half-life calculations?
  
• Can you answer this question of physics?
  
• At the equator a 1000 turn coil with a cross sectional area of 300 cm2 and a resistance of 15 #Omega# is aligned with its plane perpendicular to the earth’s magnetic field of 7*10^-5 T . If the coil is flipped over how much charge flows through it?
  
• 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?
  
• 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.(?)
  
• 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)?
  
• What is the proof for a diffraction grating formula #dsintheta=nlamda#?
  
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