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Homework Help: Angular Acceleration Problem - Compact Disc

  1. Feb 5, 2014 #1
    During the time a compact disc (CD) accelerates from rest to a constant rotational speed of 477 rev/min, it rotates through an angular displacement of 0.250 rev. What is the angular acceleration of the CD?

    I converted 477 rev/min into 49.95 rad
    I converted 0.250 rev to radians which is 1.57 rad

    Then I am using
    ω^2 = ωø^2 + 2 α Θ
    49.95/2(1.57 radians) = α
    15.90 = α


    BUT i am not getting the answer
     
    Last edited: Feb 5, 2014
  2. jcsd
  3. Feb 5, 2014 #2
    the answer is 866 rad/s^2
     
  4. Feb 5, 2014 #3

    haruspex

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    ω^2 = ωø^2 + 2 α Θ
     
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