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28 May, 09:30

If the efficiency of a lever is 30% and 560 J is used to move the lever, what is the work output?

A) 18.7J

B) 168 J

C) 1,867 J

D) 16,800 J

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Answers (1)
  1. 28 May, 13:14
    0
    If the efficiency is 30%, then 30% of the work you put into it comes out

    in the form of useful work, and the other 70% turns into forms of energy

    that you can't use to do the job ... like heat.

    30% of 560 J = 168 J (B)
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