First slide
Moment of intertia
Question

A uniform square plate has a small piece Q of an irregular shape removed and glued to the centre of the plate leaving a hole behind as shown in figure. The moment of inertia about the Z-axis is 

Easy
Solution

In the given diagrams, when the smaIl piece Q removed and glued to the centre of the plate, the mass comes closer to the Z-axis, hence moment of inertia decreases.

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