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At a party, you notice a disco ball (a hollow sphere of mass 0.50 kg and...

At a party, you notice a disco ball (a hollow sphere of mass 0.50 kg and radius 15 cm) attached to a thin rod of mass 2.5 kg and length 0.50 m. The disco ball has come loose and is oscillating about a pivot at the top of the rod in a vertical plane as shown. You time the number of oscillations per second and find this frequency is closest to:

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