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A 23 g ball with a radius of 30 mm rolls back and forth in a...

A 23 g ball with a radius of 30 mm rolls back and forth in a hemispherical bowl of radius 6.5 cm.

(a) What is the period of the oscillation if the ball is solid?

(b) What is the period of the oscillation if the ball is hollow?

(c) What is the percent difference between the two?

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