Homework Help: Physics

Posted by Aja on Wednesday, April 21, 2010 at 9:39am.

A non-rotating cylindrical disk of moment of inertia I is dropped onto an identical disk rotating at angular speed w. Assuming no external torques, what is the final common angular speed of the two disks?

Physics - bobpursley, Wednesday, April 21, 2010 at 9:42am
You doubled moment of inertia. Angular momentum total must be the same.

If you keep angular momentum the same, then angular speed must be 1/2 the original.

Rotational energy is not conserved.

Answer this Question

Related Questions

physics - A thin disk, mounted on a frictionless vertical shaft of negligible ...
Physics - A solid disk rotates in the horizontal plane at an angular velocity of...
Physics - A solid disk rotates in the horizontal plane at an angular velocity of...
Physics - A large disk of mass M and radius R is spinning like a CD of merry-go-...
Physics - The moment of inertia of an object depends on the shape of the object...
physics - A 1.6 kg disk with radius 0.63 m is rotating freely at 55 rad/s ...
physics - If a disk rotating at 900 rpm couples to a stationary disk with five ...
Physics - Two disks are rotating about the same axis. Disk A has a moment of ...
physics - Two disks are rotating about the same axis. Disk A has a moment of ...
Physics - Suppose a cylindrical platform with moment of inertia 0.005kg m2 is ...

For Further Reading

First Name:
School Subject:
Answer: