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4 December, 01:27

What is the average useful power output (in W) of a person who does 6.60 ✕ 106 J of useful work in 8.40 h?

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  1. 4 December, 01:44
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    218.25 W.

    Explanation:

    Power: This is defined as the rate at which work is done. The S. I unit is Watt (W). Mathematically, it can be expressed as

    P = W/t ... Equation 1.

    Where P = useful power output, W = useful work, t = time taken to do the work.

    Given: W = 6.6*10⁶ J, t = 8.4 h = 8.4*60*60 = 30240 s.

    Substitute into equation 1

    P = 6.6*10⁶/30240

    P = 218.25 W.

    Hence the useful power output = 218.25 W.
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