Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 11 - Work - Exercises and Problems - Page 304: 27

Answer

$W_{ext} = -1~J$ Energy is transferred from the system to the environment.

Work Step by Step

We can use conservation of energy to find $W_{ext}$: $K_i+U_i+W_{ext} = K_f+U_f+\Delta E_{th}$ $W_{ext} = K_f+U_f+\Delta E_{th}-K_i-U_i$ $W_{ext} = (1~J)+(2~J)+(1~J) -(4~J)-(1~J)$ $W_{ext} = -1~J$ Since $W_{ext} \lt 0$, energy is transferred from the system to the environment.
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