A 17 g audio compact disk has a diameter of 12 cm. The disk spins under a laser that reads encoded data. The first track to be read is 2.3 cm from the axis; as the disk plays, the laser scans tracks farther and farther from the center. The part of the disk directly under the read head moves at a constant 1.2 m/s.

a. When a disk is inserted, it takes 2.4 s to spin up from rest. What is the torque of the motor?

b. As the disk plays, how does the angular speed change?