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Homework Help: Resulting angular speed

  1. Apr 9, 2015 #1
    1. The problem statement, all variables and given/known data

    A circular turntable of mass 2.0 kg and radius 6.0 inches is rotating freely at 66 2/3 rpm. If a 500 gram blob of clay is dropped on the disk at a distance of 4.0 inches from the center, what is the resulting angular speed of the system? Treat the clay as a point mass (I = MR^2) and the turntable as a disk.

    2. Relevant equations

    3. The attempt at a solution
    I understand the resulting angular speed will be the sum of the two. But what does moment of inertia have to do with it??
  2. jcsd
  3. Apr 9, 2015 #2


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    What do you mean about the angular speed being the sum of the two? Doesn't sound right.
    What relevant conservation law do you know?
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