Posted by **cat** on Monday, December 3, 2012 at 2:26pm.

A 55-kg woman cheats on her diet and eats a 465-Calorie (465 kcal) jelly doughnut for breakfast.

(c) If the human body is only 24% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

I got 24075.32468 stairs to perform an amount of mechanical work equivalent to the food in one jelly doughnut (which is correct). I assumed that I would just multiply that number by 0.76 (100%-24%) and then add my answer to 24075 stairs, but that was wrong. I then tried the 24% but that was wrong to. What do I do?

## Answer This Question

## Related Questions

- chemistry - 49-kg woman cheats on her diet and eats a 582-Calorie (582 kcal) ...
- physics - You set your stationary bike on a high 80 N friction like resistive ...
- Physics - A car's engine is only 12% efficient at converting chemical energy in ...
- Science - A car's engine is only 12% efficient at converting chemical energy in ...
- Science - A car's engine is only 12% efficient at converting chemical energy in ...
- Physics - a bike is 25% efficient in converting energy of the bicyclist to ...
- ap chemistry - a battery operated tool, such as a cordless drill, converts... a...
- physics - The student’s body is 22% percent eﬃcient; that is, for every ...
- Science 8R - help (please read!!!) - Homework - Pick 4 out of the 6 forms (types...
- physics - A revolutionary new diet advertises that one can lose weight simply by...

More Related Questions