Wednesday
April 16, 2014

Homework Help: physics

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.]

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

phy - How much work is done by the motor in a CD player to make a CD spin, ...
Physics-moment of inertia PLEASE HELP - this is the question : A CD has a ...
physics - A CD has a mass of 17.4 g and a radius of 6.01 cm. When inserted into ...
physics - A CD has a mass of 17.4 g and a radius of 6.01 cm. When inserted into ...
Physics - A CD has a mass of 17.0 g and a radius of 5.98 cm. When inserted ...
Physics - A CD has a mass of 15.0 g, an inner diameter of 1.5 cm, and an outer ...
Physics - A CD (radius 6.0 cm) is spinning freely with an angular velocity of ...
Physics - what would be the appropriate answer choice for this question: If the ...
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 ...

Search
Members