1. The problem statement, all variables and given/known data Suppose in the given figure that mB=0; that is, only one mass, mA, is actually present. If the bearings are each a distance d from O, determine the forces FA and FB at the upper and lower bearings respectively. (This is from Physics for Scientists and Engineers, by Giancoli) 2. Relevant equations Equations for angular momentum and torque? τ=dL/dt 3. The attempt at a solution I'm having trouble understanding the example where both masses are present. If L does not always equal Iω, then when exactly is this true? I think I should understand the example where both masses are present first. If I want to find both forces in the figure, what equation should I start with?