Problem: Four masses are connected by massless rigid rods (see figure).a. Find the coordinate of the center of mass.b. Find the moment of inertia about a diagonal axis that passes through B and D. 

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a.

Center of the mass of a system:

rcm=(m1x1+m2x2+...+mnxnm1+m2+...+mn,m1y1+m2y2+...+mnynm1+m2+...+mn)

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Problem Details

Four masses are connected by massless rigid rods (see figure).

a. Find the coordinate of the center of mass.

b. Find the moment of inertia about a diagonal axis that passes through B and D.