Quick Question on Energy

Question

A wagon is pulled by a force of 38.0 N on the handle at an angle of 42° with the horizontal. If the wagon is pulled in a circle of radius 25.0 m, determine how much work is done?

Answer 1

The force in the direction of motion is 38cos42 = 28.24 N

I assume that the travel is one revolution around the circle

So, distance D = 2pi(25) = 50pi

The work is force x distance = 28.24(50pi) = 1,411.975pi = 4,435.85 N-m