1. The problem statement, all variables and given/known data The four masses shown in the figure below are connected by massless, rigid rods. http://i241.photobucket.com/albums/ff4/alg5045/p13-17.gif a.) Find the coordinates of the center of mass if Ma=100g and Mb=Mc=Md=230g. b.) Find the moment of inertia about an axis that passes through mass A and is perpendicular to the page. c.) Find the moment of inertia about a diagonal axis that passes through masses B and D. 2. Relevant equations I = mA(rA^2) + mB(rB^2) + etc... 3. The attempt at a solution I solved part a by taking the x coordinates times the masses and then dividing by all of the masses. I did the same thing for the y coordinates. For both the x and the y coordinates I got .058m. For parts b and c I tried using the above equation, but it didn't work. I assumed for part b that it would be zero because mass a is at the origin, but that was wrong.