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

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  102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1  102 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.

bobpursley · Answer

angular acceleration=(vf-vi)/time change 72min to seconds, change velocities to radians/sec angacceleration=2PI/60 (480-210)/72*60