College Physics
Solutions
College Physics
A disk of mass m is spinning freely at 6.00 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. (a) What is the angular speed of the new system? (b) If a third such disk is dropped on the first two, find the final angular speed of the system.
(a)
Given info: The initial angular speed of the disk is
Explanation: The angular momentum of the two-disk system is conserved hence there is no external torque on their collision. The angular moment of these systems is defined as
The formula for the angular speed of the new system is,
(b)
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