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26 December, 16:51

The pulley has an efficiency of 78%. How much useful work does the pulley do if you perform 775 J of work on the pulley

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  1. 26 December, 18:39
    0
    605 J

    Explanation:

    Efficiency = work out / work in

    0.78 = W / 775 J

    W = 605 J
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