Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 7 - Work and Kinetic Energy - Problems and Conceptual Exercises - Page 214: 76

Answer

(a) $4.8W$ (b) $430J$

Work Step by Step

(a) We can find the required power as follows: $P=Fv$ We plug in the known values to obtain: $P=(21)(0.23)$ $P=4.8W$ (b) We know that $P=\frac{W}{t}$ This can be rearranged as: $W=Pt$ We plug in the known values to obtain: $W=(4.8)(1.5\times 60)$ $W=430J$
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