Posted by **Annette** on Monday, April 29, 2013 at 11:06am.

49-kg woman cheats on her diet and eats a 582-Calorie (582 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 28% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

stairs

- chemistry -
**DrBob222**, Monday, April 29, 2013 at 1:00pm
4.184 J = 1 calorie

## Answer This Question

## Related Questions

- college physics - A 55-kg woman cheats on her diet and eats a 465-Calorie (465 ...
- physics - A 91 kg student eats a 200 Calorie doughnut. To “burn it off”, he ...
- math - if jay eats 1/3 of jelly beans and jack 1/4 of the jelly bean leveing ...
- Physics - A(n) 80.0-kg student eats a 160-Calorie doughnut. To burn-it-off, he ...
- Physics - A 53 kg student eats a 200 Calorie doughnut. To “burn it off”, he ...
- Math - In a bag of 400 jelly beans, 25% of the jelly beans are red in color. If ...
- Math - bill ate 1 jelly bean on sunday, 2 jelly beans on monday and 3 jelly ...
- English - Which way is "1" used in a sentence? For example, I ate 1 doughnut. Or...
- Math - The ratio of red jelly beans to yellow jelly beans in a dish is 3:4. if ...
- Math - The ratio of red jelly beans to yellow jelly beans in a dish is 3:4. If ...

More Related Questions