1. The problem statement, all variables and given/known data Find the mass moment of inertia of a L-shaped bar that has legs of 1.2 m long and total mass of bar is 20 kg. 2. Relevant equations I=1/12*m*L^2 parallel axis theorem 3. The attempt at a solution I've tried attempting this problem but I just can't figure out how to apply mass moments to the parallel axis theorem. Any help on this problem would be greatly appreciated. I need to figure this mass moment of inertia for a rotational dynamics problem I'm working on.
Add the moment of inertia of each "leg" together to get the total. Where's the axis of rotation? The formula you gave is for a thin rod rotating about its center. You can use the parallel axis theorem to find the moment of inertia of a thin rod about any parallel axis.
still no luck I do not know where the axis of rotation is. The problem states that a slender L-shaped bar is at rest in a vertical plane. a bar rotating about it's end is 1/3mL^2
If you're not told the axis, how can you be expected to find the moment of inertia? Please post the full problem exactly as given.