Posted by **arslan** on Thursday, December 29, 2011 at 12:09pm.

The center of mass and the moment of inertia of a 2D rigid body

A 2D rigid body shown in the figure-2 has constant density ρ kg/m2. It is a thin circular disc of radius R centered at point P that contains a circular cavity centered at point Q. The distance PQ = R/3. Find the center of mass of the rigid body

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**drwls**, Thursday, December 29, 2011 at 7:53pm
I can't see your Fig. 2, but all you have to do is subract the moment of inertia of cavity, treating it as if it were a mass with the same density. Subtract it from the moment of inertia of the larger disc, treating it as having no hole. You may have to use the parallel axis theorem for moments of inertia about axes that do not pass through a center of symmetry.

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