Q. There is a uniform circular disc of radius $R$ and a concentric disc of radius $r$ (where $r < R$) is cut off from it. The distance of the new position of centre of mass of hollow disc from the centre of disc is
A) $\frac{R - r}{2}$
B) $R - r$
C) Zero
D) $\sqrt{R^{2} - r^{2}}$
Explanation
(c) There is no shift in position of centre of mass, as clear from the figure
[image:7_image184.emf]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.