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The efficiency of a machine is 80% calculate the work done by a person using the machine to raise a load of 300kg through a height of 4m (take g=10/s2)

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5 answers
  1. work = force * distance
    But you only get to use 80% of the work input. That means that
    0.8W = 300*10*4

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    oobleck
  2. I need the answer

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  3. 62500 i think

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  4. Efficiency=work out put/work input x 100
    80/100=200 x 3 x 10/x
    80x=600000
    x=7500j

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  5. 7500j

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