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What is the average useful power output of a person who does 5.90×106 J of useful work in 7.90 h?

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307 W

7.90h * 3600s/h = 28,440 s. = 2.84*10^4 s.

P = 5.90*10^6/2.84*10^4 = 207.5 J/s. = 207.5 Watts.

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