1. The problem statement, all variables and given/known data There is a solar panel array of 3 panels connected to a spacecraft. The panels in the array are connected linearly (in a row: panel1 + panel2 + panel3 + spacecraft) with hinges. They are all 0.2 meters by 0.3 meters and connected along the 0.3 meter side using 2 hinges for each panel. I'm looking for the MOI so that I can calculate the angular momentum of all 3 panels when they are released from their folded position once the craft is in orbit. They are folded together on the hinged sides and all 3 are in a "pile" before being released. 2. Relevant equations I=1/3*M*a^2 'a' being the length of the shorter side in this case 0.2 3. The attempt at a solution Innermost panel has to swing outward with the mass of the other 2 attached to it: I=1/3*(M*3)*a^2 Middle panel has to swing outward with the mass of itself plus outer panel attached to it: I = 1/3*(M*2)*a^2 outermost panel: I = 1/3*M*a^2 Since the panels are connected and moving simultaneously when released, I'm not sure this is the way to do this and I can't find any similar examples which makes me think I'm really missing something. Any help would be greatly appreciated!