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?

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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