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23 July, 19:25

A machine has an efficiency of 20 percent. Find the input work if the output work is 140 Joules

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Answers (2)
  1. 23 July, 20:03
    0
    The input work = 700 Joules

    Explanation:

    Given dа ta:

    Efficiency = 20%

    Output work = 140 joules

    Input work = ?

    The input work done can be calculated using the efficiency formula;

    Efficiency = output work done/input work done * 100

    Substituting, we have

    20 = 140/Input work * 100

    20 = 14000/input work

    20*input work = 14000

    input work = 14000/20

    = 700 joules
  2. 23 July, 21:40
    0
    X = 700 Joules

    Explanation:

    The question asked about the efficiency of the work done.

    The formula for efficiency is: Efficiency = (Useful output / input work) * 100%

    The useful output given in the question is 140J, the question asked for input work. Let X be the input work. It is also given that the efficiency is 20%.

    Using the formula of efficiency,

    20 = (140/X) * 100

    So, we simply solve the above equation.

    X = 140*100/20

    X = 700 Joules
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