Q. A uniform heavy disc is rotating at constant angular velocity $\omega$ about a vertical axis through its centre and perpendicular to the plane of the disc. Let $L$ be its angular momentum. A lump of plasticine is dropped vertically on the disc and sticks to it. Which will be constant
A) $\omega$
B) $\omega$ and $L$ both
C) $L$ only
D) Neither $\omega$ nor $L$
Explanation
(c) Angular momentum $L = I\omega$ constant
$\therefore I$ increases and $\omega$ decreases
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.