Question

Two of the things of the composite materials are to be known so that their moment of inertia can be varied. Which of the following is one of them?

(a) Weight of the centre of gravity

(b) Weight of the body

(c) Location of the centroid of gravity

(d) Location of the centre of mass

I had been asked this question in quiz.

This question is from Moment of Inertia for Composite Areas topic in section Moments of Inertia of Engineering Mechanics

Answer 1

The correct choice is (b) Weight of the body

To explain I would say: The centre of the gravity’s location and the weight of the composite body is needed to be known. This means that if both of the quantities of the composite body is known then the moment of inertia of the body can be altered. Thus both are very important things to be known about the composite bodies.