A smooth tube of certain mass containing two identical balls is rotated as shown in gravity free space and released. The two balls move towards ends of the tube. Which of the following quantity is not conserved.

Engineering

Physics

Angular Momentum and Conservation of Angular Momentum

Question

Net linear momentum of the two balls

Angular momentum of the whole system

Angular speed of the tube

Kinetic energy of the whole system

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${\vec{F}}_{ext} = 0$ and ${\vec{τ}}_{ext} = 0$
⟹ $\vec{P}$ = conserved and $\vec{L}$ = conserved
⟹ KE = conserved
But, I_i ≠ I_f
Hence, ω_i ≠ ω_f