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Work Energy Theorem Problem

  1. Dec 7, 2012 #1
    1. The problem statement, all variables and given/known data
    Using work energy theorem, solve:
    9rA7A.png


    3. The attempt at a solution
    The actual answer (3.11s) is exactly half of my answer. Does anyone know what I did wrong?
    SFjXx.jpg
     
  2. jcsd
  3. Dec 7, 2012 #2
    Note that moment of inertia of a uniform disc about an axis through its centre and perpendicular to its plane is

    [itex]\frac{1}{2}[/itex]MR[itex]^{2}[/itex].
     
  4. Dec 7, 2012 #3
    Yup! That is what I used I believe.
     
  5. Dec 7, 2012 #4

    haruspex

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    There should be two factors of 1/2 - one from Iω2/2 for the KE and another from I=Mr2/2.
     
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