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Homework Help: Moment of Inertia

  1. Nov 30, 2015 #1


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    1. The problem statement, all variables and given/known data
    In the diagram, Disk 1 has a moment of inertia of 4.40 kg · m2 and is rotating in the counterclockwise direction with an angular speed of 7.50 rad/s about a frictionless rod passing through its center. A second disk rotating clockwise with an angular speed of 9.50 rad/s falls from above onto Disk 1. The two then rotate as one in the clockwise direction with an angular speed of 1.40 rad/s. Determine the moment of inertia of Disk 2.

    2. Relevant equations

    3. The attempt at a solution
    I have no idea how to start the problem.
  2. jcsd
  3. Nov 30, 2015 #2


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    Any conservation laws you can think of that might apply?
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