Question

Moment of inertia of hollow rectangular section

Answer 1

moment of inertia of hollow section can be found by first calculating the inertia of larger rectangle and then by subtracting the hollow portion from that large rectangle.

MOMENT OF INERTIA ABOUT X-AXIS

Ix=BH312−bh312

MOMENT OF INERTIA ABOUT Y-AXIS

Iy=HB312−hb312

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Answer 2

Moment of inertia is the name given to rotational inertia, the rotational analog of mass for linear motion. 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, 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.