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21 June, 15:17

A machine has an efficiency of 70%. How much work does the machine do when 20,000 J of work is done on it? A. 14,000 J B. 28,600 J C. 1,400,000 J D. 2,860,000 J

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  1. 21 June, 15:27
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    Efficience = work output / work input; where work output is 20,000J

    70% = 20000 / work input

    work input = 20,000/0.7 = 28,571 ≈ 28,600J
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