1. The problem statement, all variables and given/known data Masses M1 and M2 are separated by a distance L. The distance of the center of mass of the system at P from M1 as shown above would be: (A) (M1L)/(M2) (B) ((M2+M1)L)/M1 (C) ((M2+M1)L)/M2 (D) (M2L)/(M1+M2) (E) (M1L)/(M1+M2) The moment of inertia of the system about the center of mass at P would be: (A) (M1+M2)L^2 (B) [(M1+M2)/(M1M2)]L^2 (C) (M1M2L^2)/(M1+M2) (D) (M1L^2)/(M1+M2) (E) (M2L^2)/(M1+M2) All of the 1s and 2s should be subscripts, I'm just lazy. 2. Relevant equations Xcom=(M1X1+M2X2)/(M1+M2) I=ML2? 3. The attempt at a solution I got the first part, that ended up being simple. The answer was D. I don't understand how to get the moment of inertia though. I tried doing I=mL^2=>I=(M1+M2)(Choice D)^2, but it didn't work. Help! Kids were telling me it was C, but I don't know how to get that.