# average angular acceleration of the CD

A certain CD has a playing time of 78 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 * 10^2 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 * 10^2 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.

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#### Solution Preview

The average angular acceleration a = (w_2 - w_1) /t

The final angular velocity w_2 = 2.1 * 100 rpm

The initial angular velocity w_1 = ...

#### Solution Summary

The solution shows the detailed steps of calculations of the average angular acceleration of the CD.

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