Physics
posted by alexs .
) 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)

ang acceleration= (wfwi)/time
change 74 min to seconds
change rpm to rad/sec (multiply by 2PI/60) 
thanks a lot
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