A 11 g circular annulus of outer radius 47 cm and inner radius35.2 cm makes small oscillations on an axle through its outer edgeperpendicular to its face.
(a) Find its frequency of oscillation.
(b) Find the frequency of oscillation of a thin ring of the sameouter radius and mass.
(c) Find the frequency of oscillation of a solid disc of the sameouter radius, thickness, and density.
