Question

Johnson is dragging a bag on a ice surface. He pulls on the strap with a force of 112 N at an angle of 45° to the horizontal to displace it 84 m in 3.33 minutes. Determine the work done by Johnson on the bag and the power generated by Johnson

Answer 1

Answer with Explanation:

We are given that

Force=F=112 N

$\theta=45^{\circ}$

Distance,$s=84 m$

Time, t=3.33 minutes

We have to find the work done by Johnson on the bag and the power generated by Johnson.

Work done, W=$Fscos\theta$

Using the formula

Work done, W=$112\times 84cos45=6652.46 J$

Power, P=$\frac{W}{t}=\frac{6652.46}{3.33\times 60}=33.3 watt$

Using 1 minute=60 s

Hence, the power generated by Johnson=33.3 watt