# Average Power Being Expended

A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.3s, What is the average power being expended?

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## SOLUTION This solution is **FREE** courtesy of BrainMass!

you are asked to calculate average power

power = work done/ time taken to do that work

Now, to find work done,

work done = force * distance

distance = 2 * pi * radius

(since the crank end moves in a circular fashion, you should convert the perimeter, to find the distance.

Hence now,

work done = 22 N * 2 * (22/7) * 0.28 = 22* 1.66 N-m

However, note that the crank handle is moved every 1.3 sec, it means that the above amount of work is done in 1.3 sec

SO what is the work done in 1 sec? that should be the answer to the average power

power = work/time = 22 * 1.66/(1.3) = .... N-m/sec

please simplify and find the number!

Thank you

Â© BrainMass Inc. brainmass.com December 24, 2021, 4:51 pm ad1c9bdddf>https://brainmass.com/physics/power/average-power-being-expended-11569