Question

How to find moment of inertia when mass per unit is given?

Answer 1

For a point mass the moment of inertia is just the mass times the square of perpendicular distance to the rotation axis, I = mr2. That point mass relationship becomes the basis for all other moments of inertia since any object can be built up from a collection of point masses.

Answer 2

Answer:

heya..

It appears in the relationships for the dynamics of rotational motion. The moment of inertia must be specified with respect to a chosen axis of rotation. For a point mass themoment of inertia is just the mass times the square of perpendicular distance to the rotation axis, I = mr2.

i hope its help u