A crane moved a 200 kg hot tub from the ground to the top of the hotel, 53m above the ground. If the crane used 200,000J of energy, how efficient was the crane?
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Expert's answer
2020-11-12T09:35:07-0500
The crane did the following work against the gravity force
"A = mgh = 200kg\\cdot 9.81m\/s^2 \\cdot 53m = 103986J"
The efficiency is defined as the ratio of usful and total work. Thus
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