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A crane lifts a concrete block, whose weight is 60,000N to a height of 20m in 30s.
What useful power is achieved by the crane?
Power formula is power=work(joules)/time(seconds). the Work formula is force (newtons) times the distance from the starting point. Calculate work first: 60,000N x20m = 1,200,000 joules. Then plug into power formula: 1,200,000j/ 30 seconds= 40,000 W
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