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Energy Quiz


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1. Box A with a mass of 3.60 kg and box B with a mass of kg are attached by a light string slung over a pulley. Box A slides along a smooth horizontal surface as box B falls. When released, box B falls 84.0 cm to the floor. Ignoring frictional effects, what is the maximum kinetic energy of box A before box B hits the floor?

Block B hangs from a string. The other end of the string is attached to block A, which slides on a table top.

2. A hiker travels 2.00 m/s up a slope inclined at º above the horizontal. The slope is 40.0 m long. How much power (in W) does the hiker expend to get up the slope if he and his equipment have a mass of 100.0 kg?

3. A kg sled slides across the ice and a 14.3 kg package is dropped vertically down onto the sled. What is the ratio, KEf/KEi, of the kinetic energy of the sled and package to the kinetic energy of the sled before the package was dropped?

4. A forklift is used to raise a kg load from the floor to a height of 3.00 m. If the forklift expends 1750 W of power, how many seconds does it take to lift the load?

5. A block is released from rest at a vertical height of cm on a plane inclined at an angle of 22.5º from the horizontal and slides down the plane.

If the block reaches a speed of m/s at the bottom. What is the coefficient of friction between the block and the plane?

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