College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Review & Synthesis: Chapters 6-8 - Review Exercises - Page 323: 4


The energy that is expended is $53,450~J$

Work Step by Step

We can find the increase in gravitational potential energy: $mgh = (80.0~kg)(9.80~m/s^2)(15~m) = 11,760~J$ This work is 22% of the total energy expended by the muscles. We can find the total energy that was expended: $0.22~E = 11,760~J$ $E = \frac{11,760~J}{0.22}$ $E = 53,450~J$ The energy that is expended is $53,450~J$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.