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A 15 g circular annulus of outer radius 42.3 cm and inner radius 29.7 cm makes...

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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