What is the efficiency of an out-of-condition professor who does 2.20 ✕ 105 J of useful work
(a) What is the efficiency of an out-of-condition professor who does 2.20 ✕ 105 J of useful work
while metabolizing 490 kcal of food energy?
(answer in %)
(b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%?
(answer in kcal)
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