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8 September, 07:03

A pulley stems has an efficiency of 65.1%. If you perform 350 J of work, how much useful work does the pulley perform?

A. 350 J

B. 301 J

C. 228 J

D. 122 J

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Answers (1)
  1. 8 September, 08:26
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    Answer;

    C. 228 Joules

    Explanation;

    Efficiency of a machine is the energy or work output, divided by the energy or work input, and expressed as a percentage. An ideal machine would have an efficiency of 100%.

    Efficiency = (work output/work input) * 100%

    work input = 350 joules, efficiency = 65.1%

    Work output = 350 j * 65.1/100

    = 227.85

    ≈ 228 Joules
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