Rotational MotionHard

Question

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

Options

A.Angular momentum
B.Linear momentum
C.Kinetic energy   
D.Angular speed

Solution

When ball moves towards ends of the tube MI increases
(∴ For system are zero)
∴ Angular momentum & linear momentum remains constant
∴ I1ω1 = I2ω2  I2 > I1  ω2 < ω1

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