A 65 kg woman cheats on her diet and eats a 537 Calorie (537 kcal) jelly donut f

Question

A 65 kg woman cheats on her diet and eats a 537 Calorie (537 kcal) jelly donut for breakfast.

(a) How many joules of energy are the equivalent of one jelly doughnut?
2246808  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.
  23512.5 stairs

(c) If the human body is only 20% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

Part C I need help on.
  

Explanation / Answer

as steps is 23512.5

20 percent of energy is used so only 20 percent of steps =4702.5

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.