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Homework Help: Simple Rotational Motion Problem

  1. Mar 20, 2005 #1
    Ok, this problem has been driving me crazy. I was thinking that the force is zero since the magnitude of the angular acceleration is zero, however that is not the case.

    Please help :)
  2. jcsd
  3. Mar 21, 2005 #2
    Do you know that the acceleration of the centre of mass of a rigid body is equal to
    (The net extenal force)/The total mass ? ( That's what the hint implied).
    If you apply this theorem to the blade,the force will be (Total mass)*( The acc. of the centre of mass, which is L/2 into the angular speed squared).
    I am, with great respect,
    P.S.- Angular acceleration results only in case of an external torque.
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