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Q.

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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a

Angular momentum

b

Linear momentum

c

Kinetic energy

d

Angular speed

answer is D.

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Detailed Solution

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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