Question

A disk of mass M is spinning freely at 5.45 rad/s when a second identical disk,...

A disk of mass M is spinning freely at 5.45 rad/s when a second identical disk, initially not spinning, is dropped onto it so that their axes coincide. In a short time the two disks are corotating.

HINT

(a)

What is the angular speed of the new system (in rad/s)?

rad/s

(b)

If a third such disk is dropped on the first two, find the final angular speed of the system (in rad/s).

rad/s

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Homework Answers

Answer #1

a) The initial angular momentum of the disk is:

After dropping another disk, the final angular momentum is:

Since there is no external force, the angular momentum will conserve.

b) When a third disk is dropped on the two disks, the angular momentum will be:

Since there is no external force, the angular momentum will conserve.

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