A 44 kilogram lady cheats on her diet and eats a 488-Calorie (488 kcal) jelly doughnut for breakfast.
(a) Find how many joules of energy are the equivalents of one jelly doughnut?
_________J
(b) Determine how many stairs must the lady climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Suppose the height of a single stair is 15 centimeter.
_________stairs
(c) If the human body is only 27 percent efficient in converting chemical energy to mechanical energy, find how many stairs must the lady climb to work off her breakfast?
_________stairs