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Distinguish between electric potential and electric potential energy.
A solid sphere of radius 10 m and mass 2.5 kg rolls down a ramp that is 3 m high. What is its velocity at the bottom of the ramp
Your sofa won't fit through the door of your new sixth-floor apartment, so you use a 1.08kW motor to lift the 84.4kg sofa 15.6m from the street. How much time does the lift take
A uniform electric field with a magnitude of 6100N/C points in the positive x direction. Find the change in electric potential energy when a +19.0-µC charge is moved 6.50cm in the positive x direction
A railroad car of mass 2.46 multiply.gif 104 kg, is moving with a speed of 4.13 m/s. What is the speed of the four cars after the collision
A balloon is filled with helium gas at 20.0 degrees Celsius at 1.0 atm (1 atm = 1.01 x 10^5 N/m^2). What is he heat flow into the gas
A meteor with a mass of 1 kilogram moving at 20 km/s collides with Jupiter's atmosphere. Find the average force on the meteor once it enters Jupiter's atmosphere (Neglect gravity)
A playground merry-go-round has radius 2.90m and moment of inertia 2500kg?m2 about a vertical axle through its center, and it turns with negligible friction. How much work did the child do on the merry-go-round
Students determine the frequencies of standing waves on the horizontal segment of the string, then they raise a beaker of water until the hanging 1.4 kg {\rm kg} sphere is completely submerged.
The electric motor of a model train accelerates the train from rest to 0.580 m/s in 33.0 ms. the total mass of the train is 563 g. Find out the average power delivered to the train during its acceleration. The units need to W for the final answer.
A 1.7nF parallel-plate capacitor has an air gap among its plates. Its capacitance increases by 3.0nF when the gap is full by a dielectric. What is the dielectric constant of that dielectric?
a woman on a bridge 107 m high sees a raft floating at a constant speed on the river below. she drops a stone from rest
Two bullets from opposite sides collide in midair during battle. What fraction of the original kinetic energy was lost in the collision
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