Questions

A smooth tube of certain mass is rotated in a gravity-free space and released. The two balls shown in the figure move towards the ends of the tube. For the whole system,
which of the following quantities is not conserved.

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Angular momentum

Linear momentum

Kinetic energy

Angular speed

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detailed solution

Correct option is D

As ∑τext=0, angular momentum and linear momentum remain conserved. As the two balls will move radially out, I changes. In order to keep the angular momentum (L=Iω) conserved, angular speed (ω) should change.

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