Conceptual physics question: I got the problem right but want to understand what's going on. In the problem, a rod was spinning with a given angular velocity. Two rings were held in place on the rod, and released so that they flew outwards towards the ends. I used conservation of angular momentum to calculate the angular velocity when the rings reached the end, but apparently the system has the same angular velocity after the rings leave. How does that work? Doesn't the mass and moment of inertia go down since it's only the rod?

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Thanks for the clear explanation! I think I understand now.

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