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Transcribed Image Text:WORK, ENERGY AND POWER
(NOTE: For the following problems, apply the work mechanical energy theorem)
1. A stone is thrown vertically upward with an initial speed of 22.8 m/s from the edge of the roof of
a building 28.2 m high. The stone just misses the edge of the building on the way down and strikes
the street below. Determine the maximum height above the ground reached by the stone and the
stone's velocitv hefore it strikes the ground. (NOTE: use work mechanical energy equation in this
problem) (
2. A horse pulls a cart with a force of 200 N at an angle of 27 deg with the horizontal and moves along
at a speed of 10 kph.
a. How much work does the horse do in 12 mins. ,
b. Find the power out of the horse in Hp (
3. A 3.2 kg box on an incline plane is push from the top and travels down with the initial speed of
9.8m/s. The incline is 5.0 m long and the angle of inclination is 30 deg. Determine the velocity of
the box at the bottom. The coefficient of friction between the box and incline lane is 0.2"
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