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Homework Help: Inertia and Momentum Question

  1. Nov 4, 2007 #1
    1. The problem statement, all variables and given/known data
    Figure 11-45 shows a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a vertical axis, with a period of rotation of 2.8 s. Assuming R = 0.62 m and m = 1.2 kg, calculate (a) the structure's rotational inertia about the axis of rotation and (b) its angular momentum about that axis.

    2. Relevant equations
    I already solved part (a) but the equations to use for part (b) are L=Iw

    3. The attempt at a solution
    I put in the I that I recieved from part (a) which is 1.5, however I don't know how to find angular velocity... Can anyone help me out?

    Attached Files:

  2. jcsd
  3. Nov 4, 2007 #2


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    Homework Helper

    You figure it out from this:

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