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A holiday ornament in the shape of a hollow sphere with
mass M = 0.015 kg and radius R = 0.050 m is hung from a tree limb
by a small loop of wire attached to the surface of the sphere. If the ornament
is displaced a small distance and released, it swings back and forth
as a physical pendulum with negligible friction. Calculate its period.
(Hint: Use the parallel-axis theorem to find the moment of inertia of the
sphere about the pivot at the tree limb.)

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