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What is the average power being expended?

  1. Oct 29, 2008 #1
    1. The problem statement, all variables and given/known data
    A person is making homemade ice cream. She exerts a force of magnitude 19 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 1.7 s, what is the average power being expended?


    2. Relevant equations
    W=FD cos theta
    P=W/T


    3. The attempt at a solution
    I first found the work by using W =FD cos theta. The force is 19, the distance traveled is .28*2*pi, so I got that the work is 33.427. I then divided by T, 1.7 to get P, which is 19.663 W. What did I do wrong?
     
  2. jcsd
  3. Oct 29, 2008 #2
    Re: Power

    What did I do wrong?
     
  4. Oct 29, 2008 #3

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Re: Power

    What makes you think you did anything wrong? That looks fine to me.
     
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