Physics

) Joe has a playing time of 74 minutes. When the music starts, the CD rotating at an angular speed of 480 revolutions per minute (rpm). At the end of the music, the CD is rotating at 210 rpm. Find the magnitude of the average angular acceleration of the CD (in rad/s^2)

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asked by alexs
  1. ang acceleration= (wf-wi)/time

    change 74 min to seconds
    change rpm to rad/sec (multiply by 2PI/60)

  2. thanks a lot

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    posted by alexs

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