   Chapter 11, Problem 4P

Chapter
Section
Textbook Problem

A 55-kg student 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 stairs must the student 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. (c) If the human body is only 25% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

(a)

To determine
The amount of joules of energy that are equivalent of one jelly doughnut.

Explanation

Given Info: mass of the student is 75 kg and eats 540 Calorie jelly doughnut.

Convert Calorie to Joule.

Q=540Cal(4186J1Cal)=2

(b)

To determine
The number of stairs climbed to convert the food energy to equivalent mechanical energy.

(c)

To determine
The number of stairs climbed to convert the food energy to equivalent mechanical energy if the body is 25% efficient.

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