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Need help on Torque

  1. Nov 6, 2005 #1

    [​IMG]
    I applied equation 4 to find the angular acceleration. And then I applied this equation, plugging in the moment of inertia I= m R R/2 and angular acceleration
    [​IMG]

    But I don't get the right answer. The answer is 0.76. Whar's wrong with my step ? thx
     
  2. jcsd
  3. Nov 6, 2005 #2

    Chi Meson

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    The differentials are not necessary here.
    What did you get for [tex] \alpha [/tex]?
    And what did you get for the answer?
     
    Last edited: Nov 6, 2005
  4. Nov 6, 2005 #3
    [​IMG]
    The answer is not 0.76. I dun know what's wrong with my step.
     
    Last edited: Nov 6, 2005
  5. Nov 6, 2005 #4

    Chi Meson

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    The angular acceleration has to be in radians/s/s, not rev/s/s. Otherwise, you are doing OK.
     
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