A certain CD has a playing time of 72 minutes. When the music starts, the CD is

Question

A certain CD has a playing time of 72 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 x 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 x 102 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.
rad/s2
A certain CD has a playing time of 72 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 x 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 x 102 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.
rad/s2

Explanation / Answer

time t= 76 min Initial angular speed w = 480 rev / min final angular speed w ' = 210 rev / min the magnitude of the average angular acceleration of the CD is a = ( w '- w) / t a = 3.5526 rev / min^ 2 = 3.5526 * 2*pi rad / ( 60 s ) ^ 2 = 6.2 * 10 ^ -3 rad / s^ 2

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