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Homework Help: Angular Velocity of weighted plates

  1. Jun 6, 2010 #1
    1. The problem statement, all variables and given/known data

    A 7kg plate with a radius of 1.4m is rotating at 63 rad/s around an axis perpendicular to its center. Another plate that is not rotating is dropped onto the first plate and their centers align. The second plate is 5kg, with a radius of .8m. What is the angular velocity of the two disks combined?

    2. Relevant equations

    3. The attempt at a solution

    I am really confused with this problem.
    What is my first step?

  2. jcsd
  3. Jun 6, 2010 #2
    Has your class been discussing the conservation of angular momentum?
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