Answers created by Jane

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• Find the range of velocities of the blocks shown in the figure below during the motion? How do we solve this problem without seeing from the center of mass frame?
  
• How do you solve #x^2 - 12x + 36 = 25# by completing the square?
  
• To what calsius temperature must 580 ml of oxygen at 17°C be raised to increase its volume 700 mL?
  
• A fourth harmonic standing wave is set up in a 3 m long guitar string. If the frequency of the wave is 191 Hz, what is its velocity?
  
• A manometer containing mercury is connected to two points A and B 15 m apart, on an inclined pipeline conveying water as shown.?
  
• An object is thrown vertically from a height of #6 m# at # 3 m/s#. How long will it take for the object to hit the ground?
  
• What is the mass of an object that needs a force of 6600 N to increase its speed from rest to 107 m/s in 2.3 seconds?
  
• A 1.55 kg particle moves in the xy plane with a velocity of v = ( 3.51 , -3.39 ) m/s. Determine the angular momentum of the particle about the origin when its position vector is r = ( 1.22 , 1.26 ) m. ?
  
• 40 Coulombs of electricity was applied over a 793 second time period. What was the current expressed in mA?
  
• An object with a mass of # 8 kg# is on a ramp at an incline of #pi/8 #. If the object is being pushed up the ramp with a force of # 7 N#, what is the minimum coefficient of static friction needed for the object to remain put?
  
• In a thermometer the ice point is marked as #10# degree Celsius,and steam point as #130# degree Celsius .What will be the reading of this scale when it is actually #40# degree Celsius?
  
• One gamble measured in air has a weight of 100 N. When immersed in the water, its weight is 75 N. How much is the dice side? The density of the water is #1000 (kg) / m^3# .
  
• If the length of a #38 cm# spring increases to #64 cm# when a #4 kg# weight is hanging from it, what is the spring's constant?
  
• Young's modulus of elasticity for #"A"# and #"B"# are #"Y"_"A" = 1.1×10^11\ "Pa"# and #"Y"_"B" = 2.0 xx 10^11\ "Pa"#. Which is more elastic and why?
  
• What is the power expended when a 17.3 N force pushes a cart 3.9 m in 0.9 seconds?
  
• How to prove this identity? #sin^2x+tan^2x * sin^2x= tan^2x#
  
• A particle is projected from ground with speed 80m/s at an angle 30° with horizontal from ground.What is the magnitude of average velocity of particle in time interval t=2s to t=6s?
  
• A billiard ball of mass .155 kg moves with a velocity of 12.5 m/s toward a stationary billiard ball of identical mass and strikes it in a head on collision. The first billiard ball comes to a complete stop. Was the collision elastic?
  
• A projectile is shot at an angle of #pi/6 # and a velocity of # 3 9 m/s#. How far away will the projectile land?
  
• Need immediate help What are the metazoan parasites that can cause auto infection in human being?
  
• A ladder rests against a wall at an angle of 60degree to the horizontal. The ladder is 8m long and has a mass of 35kg. The wall is considered to be frictionless. Find the force that the floor and wall exert against the ladder?
  
• How to calculate the net force required for the system of pulleys to move at a given acceleration?
  
• How do you solve #Log 2 + log(4x – 1) = 3#?
  
• How much work does it take to raise a #12 kg # weight #1 m #?
  
• Who is helping you?? Change into passive
  
• What is the phase difference between two simple harmonic motions represented by #x1=A sin(omegat +pi/6)# and #x2=A cos omegat# A. #pi/6# B. #pi/3# C. #pi/2# D. #(2pi)/3# ?
  
• A child of height 2.4ft is standing in front of the mirro.his brother of height 4.8ft is standing behind him.the minimum height of the mirror required so that the child can completely see his own image n his brothers image in the mirror is?
  
• Two bodies of masses #m1# and #m2# are separated by a distance #R#.The distance of the centre of mass of the bodies from the mass #m1# is #A.(m2R)/(m1+m2)#. #B(m1R)/(m1+m2)# #C. (m1m2R)/(m1+m2) ?
  
• If an object weighing 50N displaces a volume of water with a weight of 10N, what is the buoyant force on the object?
  
• Equivalent resistance?
  
• A 16 kg is accelerated from 5 m/s to 17 m/s in 4.0 seconds for a distance of of 3.0 m. How much work was done?
  
• An object travels in a circular path at constant speed. Which statement about the object is correct? A It has changing kinetic energy. B It has changing momentum. C It has constant velocity. D It is not accelerating.
  
• If the position of aparticle is given by x=5.0-9.8t+6.4t^2, what is the velocity and acceleration of the particle at t=4.0s?
  
• How much work would it take to push a # 4 kg # weight up a # 1 m # plane that is at an incline of # pi / 4 #?
  
• If a projectile is shot at a velocity of #45 m/s# and an angle of #pi/6#, how far will the projectile travel before landing?
  
• Find the volume of the figure below? A) 576 cubic cm. B) 900 cubic cm. C) 1440 cubic cm. D) 785 cubic cm.
  
• How do you find the average velocity of the position function #s(t)=3t^2-6t# on the interval from #t=2# to #t=5#?
  
• A projectile is shot from the ground at a velocity of #36 m/s# and at an angle of #(pi)/2#. How long will it take for the projectile to land?
  
• Two friends are painting a living room. Ken can paint it in 6 hours working alone. If Barbie works alone, it will take her 8 hours. How long will it take working together?
  
• A box with an initial speed of #3 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #1/3 # and an incline of #( pi )/3 #. How far along the ramp will the box go?
  
• A container with a volume of #12 L# contains a gas with a temperature of #210 K#. If the temperature of the gas changes to #420 K# without any change in pressure, what must the container's new volume be?
  
• An object with a mass of #7 kg# is on a surface with a kinetic friction coefficient of # 8 #. How much force is necessary to accelerate the object horizontally at # 14 m/s^2#?
  
• For the mass on the spring, how is the period of the harmonic motion related to the spring constant, k?
  
• A ball with a mass of #5 kg# moving at #9 m/s# hits a still ball with a mass of #8 kg#. If the first ball stops moving, how fast is the second ball moving?
  
• A ball rolls off the top of Stairway horizontally with a velocity of 4.5 M per second each step is 0.2 M and 0.3 M wide if she is 10 M per second square then the ball will strike the end step Where n is equal to?
  
• A particle is projected with velocity U makes an angle theta with respect to horizontal now It Breaks into two identical parts at the highest point of trajectory 1part retraces its path then velocity of the other part is?
  
• A plane is flying horizontally at 98 M per second and releases an object which reaches the ground in 10 seconds the angle made by 8 while hitting the ground is?
  
• A shell is fired vertically upwards with a velocity V1 from the Deck of a ship travelling at a speed of V to a person on the Shore observes the motion of the shell as parabola its horizontal range is given by?
  
• A is an acute angle and #cos A=5/13#. Without using multiplication or calculator,find the value of each of the following trigonometry function a) #cos (180°-A)# b) #sin (180°-A)# c) #tan (180°+A)# ?
  
• Given #csc^(2)(theta)=(7/2)# what is #cot^(2)(theta)#?
  
• What is the unit vector that is orthogonal to the plane containing # (i + j - k) # and # ( i - j + k) #?
  
• If a man and women inherit a particular trait at roughly the same rate, would you expect this to be an autosomal or sex-linked trait?
  
• A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/s2. If the cart has a beginning speed of 2.0 m/s, what is its final speed?
  
• How much heat would be reqired to melt 10.0 g of ice at 0 oC, warm the resulting liquid to 100 oC, and change it to steam at 110 oC?
  
• 4 equal point charges each 16uC are placed on the 4 corners of a square of side 0.2m . calculate the force on any 1 of the charges?
  
• An object is thrown horizontally from a height how does the time of flight and the range of the object change when the magnitude of initial velocity tripled?
  
• An open-ended tube is 7.8 m long. What is the wavelength of a third harmonic standing wave?
  
• A heat engine with an efficiency of 17 % does 836 J of work in each cycle. How much heat must be supplied from the high-temperature source in each cycle?
  
• If a projectile is projected at angle #theta# of horizontal and it just passed by touching the tip of two walls of height #a#,seperated by a distance #2a#,then show that range of its motion will be #2a cot(theta/2)# ?
  
• A heating element of resistance r is fitted inside an adiabatic cylinder which carries a frictionless piston of mass m and crosssection A as shown in diagram. The cylinder contains one mole of an ideal diatomic gas. The current flows through the element ?
  
• A transverse wave is given by the equation #y=y_0 sin 2pi(ft-x/lambda)# The maximum particle velocity will be #4# times the wave velocity if, A. #lambda =(pi y_0)/4# B.#lambda =(pi y_0)/2# C.#lambda =pi y_0# D.#lambda =2 pi y_0# ?
  
• A car is driven 80 km west and then 30 km 45 degree south of west. What is the displacement of the car from the point of origin? ( magnitude and displacement).
  
• 5g of ice at #0^@C# is mixed with 5g of steam at #100^@C#. what would be the final temp.?
  
• A closed-ended tube is 2.8 m long. What is the wavelength of a first harmonic standing wave?
  
• What is the frequency of the second harmonic sound wave in an open-ended tube that is 4.8 m long? The speed of sound in air is 340 m/s.
  
• A solid sphere is rolling purely on a rough horizontal surface (coefficient of kinetic friction = #mu#) with speed of center #= u#. It collides inelastically with a smooth vertical wall at a certain moment. The coefficient of restitution being #1/2#?
  
• A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity #omega# about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is?
  
• What is the SI unit of electric charge?
  
• What is the average speed of an object that is moving at #12 m/s# at #t=0# and accelerates at a rate of #a(t) =2-5t# on #t in [0,4]#?
  
• Graph a Hyperbola with vertices(2,4),(8,4), foci(-2,4), (12,4), center(5,4). Can someone help me find the equation for this?
  
• Two protons, each of charge #+1.60 * 10-19 C#, are #2.00 * 10-5 m# apart. What is the change in the electric potential energy of this pair of charges if they are brought #1.00 * 10-5 m# closer together?
  
• Four charges are brought from infinity and placed at one meter intervals as shown. Determine the electric potential energy of this group?
  
• The density of core of a planet is #rho_1# and that of outer shell is #rho_2#. The radius of core is R and that of planet is 2R. Gravitational field at outer surface of planet is same as at the surface of core what is the ratio #rho/rho_2#. ?
  
• What is the effect of friction on mass?
  
• A proton moving with a speed of vo = #3.0 * 10^4 m/s# is projected at an angle of 30o above a horizontal plane. If an electric field of 400 N/C is acting down, how long does it take the proton to return to the horizontal plane?
  
• Physics. Work Problem?
  
• Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?
  
• How much heat is evolved when 122 g water freezes to solid water (ice) at its freezing point?
  
• It takes 2 s for Juan to get the ball from a certain distance. If Juan travels at .5 m/s, how far is the ball from his initial position?
  
• An object travels North at # 5 m/s# for #2 s# and then travels South at # 1 m/s# for # 2 s#. What are the object's average speed and velocity?
  
• Please Help Again. An item on sale costs #40%# of the original price. If the original prices was #$25# what is the sale price?
  
• An engine with 880 Nm of torque acts .85 m from a pivot point. What is the force produced?
  
• If two parents have an autosomal recessive trait, what can we say about the transmission of the trait to their children?
  
• I really need help with this! Please help?!
  
• Charges of +2microC, +3microC and -8microC are placed in air at the vertices of an equilateral triangle of ide 10cm.What is the magnitude of the force acting on the -8microC due to the other two charges?
  
• The net force on a car is zero in both the horizontal and vertical directions. Which two situations could be true about the motion of the car?
  
• A gas does 50 J of work as it expands adiabatically. Is the change in thermal energy of this gas 50 J, 0 J, or -50 J?
  
• Dolphins make soundsin air and water. What is the ratio of the wavelength of their sound in air to its wavelength in water? The speed sound in air is 343 m/s and in water is 1540 m/s.
  
• Two stones are projected from the same point with same speed making angles 45°+x and 45°-x with the horizontal respectively. If x≤45° then the horizontal ratio of the two stones are in the ratio of?
  
• It is required to prepare a steel meter scale, such that the mm intervals are to be accurate within 0.0005mm at a certain temperature. Determine the max. temp. variation allowable during the rulings of mm marks? Given α for steel = 1.322 x 10-5 0C-1
  
• How can we prove that the work done to accelerate a body from rest to a velocity, V is given by W=1/2(mV^2)?
  
• For the travelling harmonic wave y(x,t) = 2cos2π(10t-0.008x + 0.35) where x and y are in cm and t is in s. The phase difference between oscillatory motion of two points separated by a distance of 0.5 m is ?
  
• Two bodies are projected at angle theta and 90 minus theta to the horizontal with the same speed the ratio of their horizontal ranges are?
  
• Resistance?
  
• Equivalent resistance?
  
• Question is below, Find acceleration of slab in two cases?
  
• A woman who is a carrier of hemophilia is married with colour blind man. Than what will be the probability of sons to be colorblind..? A) 25% B) 50% C) 75% D) 100% E) None
  
• A ball is shot from cannnon into air with upward velocity of 40 ft/sec. The equation that gives the height(h) of the ball at any time id h(t)= -16t^2+40t+1.5. How many seconds rounded to the nearest hundreth will it take the ball to reach the ground?
  
• Why do projectiles with angle 45 make the biggest range?
  
• A 30-turn coil 8 cm in diameter is in a magnetic field of 0.1 T that is parallel to its axis. a) What is the magnetic flux through the coil? b) In how much time should the field drop to zero to induce an average emf of 0.7 V in the coil? Thank you.
  
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