Two disks of identical mass but different radii (r and 2 r) are spinning on frictionless bear- ings at the same angular speed ω0 but in op- posite 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 there final angular speed?
b) what is the change in the rotational kinetic energy?
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Two disks of identical mass but different radii (r and 2 r) are spinning on frictionless bear- ings...
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