While riding behind a car traveling at 3.00 m/s, you notice that one of the car's tires has a small hemispherical bump on it's rim. If the radii of the car's tires are .300 m, what is the bump's period of oscillation? Can anyone tell me where to start with this? I'm actually not even sure what formula to use. I think I have to use T=2pi(I/(mgd))^.5 I don't know how to calculate the moment of inertia in that, though.