# Physics

A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift.

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1. 147*9.81 * 1.1 = 1586 useful work done
3620 -1586 = heat wasted = 2033 Joules

convert those Joules to kilocalories by typing 2033 Joules = kilocalories into a Google search box and get 0.486 kilocalories

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posted by Damon

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