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Kinetic Energy Of an rotating object!

  1. Oct 13, 2008 #1
    1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy?
     
  2. jcsd
  3. Oct 13, 2008 #2

    LowlyPion

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    Welcome to PF.

    What are your thoughts on how to go about solving it.
     
  4. Oct 13, 2008 #3
    well i think that Kinetic Energy is 1/2mv2so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)2 maybe?
     
  5. Oct 13, 2008 #4

    LowlyPion

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    What is the moment of inertia of the phonograph?

    Using the moment of inertia what is the formula then for rotational kinetic energy?
     
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