Pivot point Rod A massless rigid rod of length L has a ball of mass m attached to one end. The other end is pivoted in such a way that the ball will move in a vertical circle. First, assume that there is no friction at the pivot. The system is launched downward from the horizontal position A with initial speed vo. The ball just barely reaches point D and then stops. NOTE: Express your answers in terms f the L, m, and g. (a) Determine an expression for vo. |/2 gl (b) What is the tension in the rod when the ball passes through B?

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