Q. A small disc is on the top of a hemisphere of radius $R$. What is the smallest horizontal velocity $v$ that should be given to the disc for it to leave the hemisphere and not slide down it? [There is no friction]
A) $v = \sqrt{2gR}$
B) $v = \sqrt{gR}$
C) $v = \frac{g}{R}$
D) $v = \sqrt{g^{2}R}$
Explanation
The correct answer is Option B: $v = \sqrt{gR}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.