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Question:

A hoisting machine lifts a 3000 kg. load to a height of 8 meters in a time of 20 seconds. the power supplied?

to the engine is 18 hp. what is the work output and the power input...

Answer:

Work done = m*g*h Work = 3000 *9.8*8 Work = 235.200J answer to first part Power = work/time Power = 235,200/20 Power = 11,760W OR 11.76kW = 15.77 horsepower Power required to lift load.
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