Question

The center of gravity of a circular ring will be a ______________

(a) line which acts as axis of that ring

(b) point anywhere in its inner circumference

(c) point at center of ring

(d) point on centroid of cross section of ring

This question was posed to me during an internship interview.

My doubt is from Centres of Gravity in chapter Centres of Gravity, Moments of Inertia, Orthographic Reading and Conversion of Views of Engineering Drawing

Answer 1

Correct option is (c) point at center of ring

To explain I would say: The center of gravity is defined as point on which whole weight if body balances (or) a point through which the resultant of forces of gravity of every particle in body acts. It is also called center of mass. It may not necessarily lie within the body.