A mechanical device requires 420 J of work to do 230 J of work to lift a crate. What is the efficiency of the device? 190% 0.5% 183% 55%

asked Mar 26, 2020 68.3k views

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4 votes

Answer:

55%

Step-by-step explanation:

Sthenault answered Mar 28, 2020

4.9k points

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power out / power in so 230/420 = 0.547619048 using sigfiges its about .55 or 55%

Dmcquiggin answered Apr 1, 2020

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