Question

125 x 10^6 mm^4

(a) 1 x 10^6 mm^4

(b) 10 x 10^6 mm^4

(c) 17 x 10^6 mm^4

I have been asked this question in an international level competition.

Query is from Moment of Inertia for Composite Areas in chapter Moments of Inertia of Engineering Mechanics

Answer 1

Right choice is (a) 1 x 10^6 mm^4

Explanation: The product of the centroid of the section to its mass to the total mass of the body is the centre of mass. Thus the answer. The ratio is generally used to locate the coordinate of the centroid or the centre of mass.