A crane lifts a load of 6000 N at the height of 20 m in 5 seconds. Calculate the power of the crane in horse power.
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Explanation:
First find the work done.
12,000 N x 20 m = 240,000 Joules.
That is the energy expended. The work performed is thus:
240,000 J ÷ 30 s = 8,000 Watts
Thus the power or rate of work this machine can develop is at least 8,000 watts.
It may well be capable of more.
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