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A torsion pendulum is constructed of a copper rod of radius 3 mm and length 50 cm. A hollow sphere of mass 1.83 kg and radius 0.5 m is attached to the end of the copper rod and set into oscillation by twisting the rod/sphere. The sphere is rotated 10.2 degrees and then released. If the maximum rotational velocity of the sphere is 1.1 rad/s , what is the period of oscillation?

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