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(a) What is the efficiency of an out-of-condition professor who does1.9010 5 J of useful work while metabolizing490kcal of food energy? ________% (b) How many

(a) What is the efficiency of an out-of-condition professor who does1.9010⁵J of useful work while metabolizing490kcal of food energy? ________% (b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of20%? _________ kcal

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