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 213: 51

Answer

(a) $1.15\times 10^{-4}W$ (b) $decreased$.

Work Step by Step

(a) We know that $P=Fv$ $P=mgv$ We plug in the known values to obtain: $P=(4.35)(9.81)(\frac{0.760}{3.25days\times \frac{86400s}{days}})$ $P=1.15\times 10^{-4}W$ (b) As $P=Fv$, this equation shows that power and velocity are directly proportional. To increase the power, we have to increase the velocity, which means that we should decrease the time so that velocity is increased.
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