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How many joules equivalent to energy, how much work to perform an amount of mechanical work

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60-kg woman cheats on her diet and eats a 655-Calorie (655 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 26% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast? 
 stairs
asked Dec 15, 2017 in Physics by shahemaabdelhady (400 points)

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