1. Material 2. Questions: a) (pink) Why does the author use two different values of inertia for the same slender rod ? 3. The attempt at a solution a) I could assume that 1/3 is holding it at the end and 1/12 is holding it in the center. But it's not interchangeable because if I chose 1/3 instead of 1/12 in the example (17.10) I would get totally different final result.