Question

A barge is pulled down a canal by a horse walking beside the canal.If the angle of the rope is 60.0 the force exerted is 400. N and the barge is pulled 100.m, how much work did the horse do?

Answer 1

The work W done by a force F on an object along a distance d when the angle between the force and the displacement is θ, is given by:

$W=F\cdot d\cdot\cos \theta$

Substitute θ=60°, F=400N and d=100m to find the work:

$W=(400N)(100m)\cos (60)=20,000J$

Therefore, the work done by the horse is equal to:

$20,000J$