Posted by **trace** on Tuesday, January 18, 2011 at 8:02pm.

A CD has a diameter of 12.0 cm and a mass of 15.8 g. The motor in

a CD player causes the disk, initially at rest, to spin. When in operation, the CD spins in such a way

that the laser scans the tracks at a constant tangential velocity of 1.20 m/s. The first track of the CD is

at a radius of 20.0 mm from the centre of the disk. Calculate the work done by the motor in the CD

player in bringing the disk from rest to the proper speed to read the first track. You may ignore the

small circular hole at the CD’s centre. [Hint: Recall the work-kinetic energy theorem.]

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