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(a) What is the efficiency of an out-of-condition professor who does2.1010 5 J of useful work while metabolizing500kcal of food energy? Answer: 10.04 % (b)How

(a) What is the efficiency of an out-of-condition professor who does2.1010⁵J of useful work while metabolizing500kcal of food energy?

Answer: 10.04 %

(b)How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of25%?

Answer_______ kcal

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