A CD player varies its speed as it moves to another circular track on the CD. A

Question

A CD player varies its speed as it moves to another circular track on the CD. A CD player is rotating at 300 rpm. To read another track, the angular speed is increased to 450 rpm in a time of 0.75 s. Calculate the average angular acceleration in rad/s2 for the change to occur. A CD player varies its speed as it moves to another circular track on the CD. A CD player is rotating at 300 rpm. To read another track, the angular speed is increased to 450 rpm in a time of 0.75 s. Calculate the average angular acceleration in rad/s2 for the change to occur. A CD player varies its speed as it moves to another circular track on the CD. A CD player is rotating at 300 rpm. To read another track, the angular speed is increased to 450 rpm in a time of 0.75 s. Calculate the average angular acceleration in rad/s2 for the change to occur.

Explanation / Answer

Initial angular speed = 300 rpm

Final angular speed = 450 rpm

Time taken to change the angular speed = 0.75 s

Chnage in angular speed = (450-300) rpm = 150 rpm

150 rpm = 15. 70 rad/s

Hence, average angular acceleration = 15.70/0.75 rad/s2

= 20.94 rad/s2

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