Chapter 10, Problem 83A

To determine

To Show: $P=Fv\cos \theta$

Explanation of Solution

Introduction:

As power is given as,

  $P=\frac{W}{t}$

Where $W$ is work done and $t$ is time.

Work done can be written as,

  $W=Fd\cos \theta$

  $P=\frac{Fd\cos \theta }{t}$

As, $\frac{d}{t}=v$ here $v$ is velocity

Hence, $P=Fv\cos \theta$