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What is the moment of inertia of this rotating object?

  1. Dec 2, 2012 #1
    Number15-1.png

    KErotational = (1/2)Iω2
    420 = (1/2)Iω2
    420 = (1/2)I(402)
    420/(402) = (1/2)I
    0.2625 = (1/2)I
    2(0.2625) = I
    0.525 = I
    0.53 = I
     
    Last edited: Dec 2, 2012
  2. jcsd
  3. Dec 2, 2012 #2

    Doc Al

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    Staff: Mentor

    You cannot set KE = L. The units don't even match.

    What's the expression for rotational KE in terms of ω?
     
  4. Dec 2, 2012 #3
    (1/2)I(v/r)?

    I'm not sure if there is another equation for rotational KE
     
  5. Dec 2, 2012 #4
    KErotational = (1/2)Iω2
    420 = (1/2)Iω2
    420 = (1/2)I(402)
    420/(402) = (1/2)I
    0.2625 = (1/2)I
    2(0.2625) = I
    0.525 = I

    Is that right?
     
  6. Dec 2, 2012 #5

    Doc Al

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    Staff: Mentor

    Looks good.
     
  7. Dec 2, 2012 #6
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