Two coaxial discs, having moments of inertia I1 and $\frac{{{I_1}}}{2}$ are rotating with respective angular velocities ω1 and $\frac{{{\omega _1}}}{2}$about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei are the final and initial total energies, then (Ef – Ei) is:

Question

Two coaxial discs, having moments of inertia I1 and $\frac{{{I_1}}}{2}$ are rotating with respective angular velocities ω1 and $\frac{{{\omega _1}}}{2}$about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei are the final and initial total energies, then (Ef – Ei) is:

TuteeHUB · Accepted Answer

NA

TuteeHUB · Answer

$ - \frac{{{I_1}\omega _1^2}}{{12}}$

TuteeHUB · Answer

$\frac{{{I_1}\omega _1^2}}{6}$

TuteeHUB · Answer

$\frac{3}{8}{I_1}\omega _1^2$

TuteeHUB · Answer

$ - \frac{{{I_1}\omega _1^2}}{{24}}$

1.	Two coaxial discs, having moments of inertia I1 and \(\frac{{{I_1}}}{2}\) are rotating with respective angular velocities ω1 and \(\frac{{{\omega _1}}}{2}\)about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei are the final and initial total energies, then (Ef – Ei) is:
A.	\( - \frac{{{I_1}\omega _1^2}}{{12}}\)
B.	\(\frac{{{I_1}\omega _1^2}}{6}\)
C.	\(\frac{3}{8}{I_1}\omega _1^2\)
D.	\( - \frac{{{I_1}\omega _1^2}}{{24}}\)
Answer» E.

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