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.

Angular mometum

linear momentum

kinetic energy

angular speed

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The correct Answer is:

As `Sigmatau=0` angular momentum and linear moimentum remain conserved. As the two balls will move radially out `I` changes. In order to keep the agular momentum `L=Iomega` conserved, angular speed `omega` should change.

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