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.]

- physics -
**Sarah**, Tuesday, February 23, 2016 at 3:22am
1.02x10^-1

## Answer This Question

## Related Questions

- Physics-moment of inertia PLEASE HELP - this is the question : A CD has a ...
- phy - How much work is done by the motor in a CD player to make a CD spin, ...
- Physics - A disk with a mass of 13 kg, a diameter of 25 cm, and a thickness of 8...
- Physics - A disk with a mass of 18 kg, a diameter of 50 cm, and a thickness of 8...
- Calc Physics - A disk with a mass of 17 kg, a diameter of 25 cm, and a thickness...
- Angular Velocity Question - A disk with a mass of 18 kg, a diameter of 50 cm, ...
- physics - A turntable must spin at 33.7 rpm (3.53 rad/s) to play an old-...
- physics - A force of 100 N is applied tangentially to a disk of radius 10 cm ...
- math - Kristen and Christopher were playing a board game. They used a spinner ...
- physics - A circular disk of mass 0.2 kg and radius 24 cm, initially not ...

More Related Questions