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Rotational motion problem

  1. Mar 29, 2006 #1
    I figured out the first part of the problem below, but I haven't been able to solve the second part.

    [​IMG]

    [​IMG]

    What I have so far:

    I solved for angular acceleration with alpha = v / r1 * t. I got 92.2 rad / s^2.

    But, I'm not sure how to go about finding the force required of the triceps...any ideas?
     
  2. jcsd
  3. Mar 29, 2006 #2
    I think it wants you to look at it as if it were a lever, 2.5cm on one side, 31cm on the other side. If you calculate the mechanical advantage, you will be able to get the force, I believe.

    EDIT: Is that in the Giancoli Physics text? If so, what page is that on?
     
  4. Mar 30, 2006 #3
    Thank you. Unfortunately we have not discussed levers yet and are just in the middle stages of torque. Mechanical advantage is in the next chapter, I think.

    Yes, it is Giancoli (Sixth) page 221.
     
  5. Mar 30, 2006 #4

    andrevdh

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    The triceps muscle applies a torque [itex]\tau[/itex] to the forearm. How is this related to the angular acceleration, [itex]\alpha[/itex], of the forearm and ball?
     
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