(a) What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 490 kcal of food energy? (Enter your answer as a percentage. Enter a number.)  % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? (Enter a number.)  kcal

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A: GIven data: L=47 cm=0.47 md=1.5 cm=0.015 mN=670 turnsB=2.3 TI=52 A

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