A17 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. when a disk is inserted, it takes 2.4 s to spin up from rest.
1. what is the torque of the motor?

0.00066518 Nm

Explanation:

v = Velocity = 1.2 m/s

r = Distance to head = 2.3 cm

= Final angular velocity

= Initial angular velocity = 0

= Angular acceleration

t = Time taken = 2.4 s

Angular speed is given by

From equation of rotational motion

Torque

The torque of the motor is 0.00066518 Nm

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