Sara, who weighs 71 kg, is on a guilt trip after eating a 763-Calorie (763 kcal)

Question

Sara, who weighs 71 kg, is on a guilt trip after eating a 763-Calorie (763 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. She decides to work out before going to her weekly weight-watchers' meeting. If the height of a single stair is 12 cm, and her body is only 33% efficient in converting chemical energy to mechanical energy, determine the number of stairs Sara must climb to cancel out the Calories consumed, stairs (a) What is the efficiency of an out-of-condition professor who does 1.90 times 10^5 J of useful work while metabolizing 500 kcal of food energy? % (b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 15%? kcal

Explanation / Answer

E = 0.33 Q

N (mgh) = 0.33 Q

so, N = 0.33Q / mgh = 0.33 * 763 * 103 (4.184) / 71 * 9.8 *0.12

N = 12617.24

so no of stairs 12617

as per the chegg guidelines ... please post each different questions as a separate question.

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