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Spinning the wheels: intro to angular momentum

  1. Oct 18, 2007 #1
    An object has rotational inertia I. The object, initially at rest, begins to rotate with a constant angular acceleration of magnitude alpha. What is the magnitude of the angular momentum L of the object after time t?

    So I know that I have to find angular velocity and use the equation
    L=angular momentum= I(omega) ... so how do i find this omega in terms of alpha and t??

    I know that torque = r*F and L = r*momentum ... and F=m(alpha)(r) ??? ..
  2. jcsd
  3. Oct 18, 2007 #2

    Doc Al

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    Staff: Mentor

    If it were a linear velocity problem, could you find the speed given acceleration and time? Use similar thinking.
  4. Oct 18, 2007 #3
    ah that's too easy .. thanks lots:)
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