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17-1 A 55.0-kg woman eats a 540 Calorie (540 kcal) jelly doughnut for breakfast. (a) How...

17-1

A 55.0-kg woman eats a 540 Calorie (540 kcal) jelly doughnut for breakfast.

(a) How many joules of energy are the equivalent of one jelly doughnut?
  
(b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 17.2 cm.
  

(c) If the human body is only 25.0% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast?
  

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