Posted by **Kayla** on Saturday, November 19, 2011 at 12:20pm.

Two disks of identical mass but different radii (r and 2r) are spinning on frictionless bearings at the same angular speed ω0, but in opposite directions. The two disks are brought slowly together. The resulting frictional force between the surfaces eventually brings them to a common angular velocity.

(a) What is the magnitude of that final angular velocity in terms of ω0? (Use the following as necessary: ω0.)

(b) What is the change in rotational kinetic energy of the system? (Use the following as necessary: K as the initial kinetic energy.)

Explain.

## Answer this Question

## Related Questions

- physics - A disk of mass m is spinning freely at 6.22 rad/s when a second disk ...
- Physics (help) - A solid disk 1 with radius R1 is spinning freely about a ...
- school - Two disks are spinning freely about axes that run through their ...
- Physics Classical Mechanics - A solid disk 1 with radius R1 is spinning freely ...
- physics - The speed of a moving bullet can be determined by allowing the bullet ...
- physics - Two disks are mounted (like a merry-go-round) on low-friction bearings...
- physics - The speed of a moving bullet can be determined by allowing the bullet ...
- physics - There are two spinning disks A and B arranged so that they initially ...
- physics - Two disks are mounted (like a merry-go-round) on low-friction bearings...
- Physics - Two disks are mounted (like a merry-go-round) on low-friction bearings...

More Related Questions