physics help please?

Question

A person is making homemade ice cream. She exerts a force of magnitude 20 N on the free end of the crank handle, and this end moves in a circular path of radius 0.32 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.4 s, what is the average power being expended?
W

Answer 1

Watts = F * velocity.

F= 20 Newtons
Velocity= Distance/time
Distance= pi *2r = pi*2*.32m
Time = 1.4 secs

Plug n play.

The answer is going to be ~ 30 watts. If you are off by more than 3 watts, try again.