A 15 g circular annulus of outer radius 42.3 cm and inner radius
29.7 cm makes small oscillations on an axle through its outer edge
perpendicular to its face.
(a) Find its frequency of oscillation.
(b) Find the frequency of oscillation of a thin ring of the same
outer radius and mass.
(c) Find the frequency of oscillation of a solid disc of the same
outer radius, thickness, and density.
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