1. The problem statement, all variables and given/known data I'm given the following four structures with their rotational axes marked, I have to rank them from largest to smallest rotational inertias, I have trouble with that apparently. 2. Relevant equations No equations are really necessary, just my book says the more mass there is on one side of the rotation axis, the higher the rotational inertia. 3. The attempt at a solution I gave the following four answers a>b>d=c (Before I read the chapter, just using intuition) a>b>d>c a>b>c>d (again before I read the chapter, at this point I realized I was completely off) c=d>b>a (I said c and d are equal because the mass they both separate is about equal, and b is greater than a because it seems it would be "harder" to rotate about that axis then a, a would rotate freely, b would have a bit of trouble, c and d would balance) Am I thinking about this all wrong (yes)?