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A smooth tube of certain mass is rotated...

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

A

Angular momentum

B

Linear momentum

C

Kinetic energy

D

Angular speed

Text Solution

Verified by Experts

The correct Answer is:
D
`(D)` As `Sigma tau=0,` Angular momentum, linear momentum remains conserved.
As the two balls will move radially out, `I` changes. In order to keep the angular momentum `(L=Iomega)` conserved, angular speed `( omega )` should change Hence `(D)`.
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