### How many stairs must woman climb to work off her breakfast

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##### Reference no: EM13267512

A 65-kg woman cheats on her diet and eats a 612-Calorie (612 kcal) jelly doughnut for breakfast.

(a) How many joules of energy are the equivalent of one jelly doughnut?

_______ J

(b) How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm.

_____ stairs

(c) If the human body is only 21% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

______ stairs

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