what is the average power?

Question

A person is making homemade ice cream. She exerts a force of magnitude 17 N on the free end of the crank handle, and this end moves in a circular path of radius 0.33 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.8 s, what is the average power being expended?

i attempted this already and it said i was wrong. my teacher hasn't taught us power yet but i guess because im in ap, he thinks we can do web assign by ourselves untaught. this is due tonight. please help me. i really have tried and came here as a last resort. i tried to do it by my self and found i really do just need help. please, explain how to do this

thank you so very much!!!!

Answer 1

Power P is energy W over time t.( In this case work done on churning or cranking the handle is energy in question)

P=W/t

Energy or work W is a product of force applied along the path s.

W= F s
where path s for each revolution
s= 2piR

let's put it together
Now power applied per revolution is
P= F 2 pi R/t
P= 17 x 2 x3.14...x .33/1.8=19.6 W