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Mechanics }Moment of Inertia
The moment of inertia of the center penny about the center is just ![1/2 m r^2](/cgi-bin/mimetex.cgi?1/2 m r^2)
The moment of inertia of any one of the other pennis about the center is given by the parallel axis theorem, , where d is the distance from the new point from the center of mass. for each penny, and thus one has , since the distance from the center of each penny to the center of the configuration is 2r.
Since there are 6 pennies on the outside, one has the total inertia , as in choice (E).
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