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Homework Help: Angular velocity and accelerating problem

  1. Dec 18, 2008 #1
    1. The problem statement, all variables and given/known data

    A disk accelerates with a constant angular acceleration of 2.0 rad/s2. If the initial angular velocity is 5.0 rad/s, what is the angular velocity of the disk after rotating though an angle of 11.0 radians?

    a = 2 rad/s^2
    vo = 5 rad/s
    Theta = 11 rad

    2. Relevant equations

    a = v^2/r
    v = change in theta/change in time

    3. The attempt at a solution

    I'm very confused on these angular problems. Everyone always tells me that they're just like the linear ones but I disagree. There's something big that I'm missing.

    I tried a couple things since I couldn't find a good formula to use.

    I tried.. 5 + 1/2(2)(11^2) which is wayy too high I'm thinking.

    Then I tried 5 + 2*11 = 27 rad/s.. which is also wrong.

    Clearly I'm very confused, can anyone help me on the right track?

  2. jcsd
  3. Dec 18, 2008 #2


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  4. Dec 18, 2008 #3
    Thank you very much! I got it now, I guess I should have searched harder for a good equation.

    My fault.
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