The solid uniform disk of radius b shown can turn freely on an axle through its center. A hole of diameter D is drilled through the disk; its center is a distance r from the axle. The weight of the material drilled out is Fwh. Find the weight of an object hung from a string wound on the disk that will hold the disk at equilibrium in the position shown. I really can't figure this one out. I use the center as the axle but I can't find what the distance from the axle would be for the center of mass since the hole drilled in moves it from the center. Can anyone give me a hint to get me started?