Question: A pendulum, comprising a light string of length L and a small sphere, swings in the vertical plane. The string hits a peg located a

A pendulum, comprising a light string of length L and a small sphere, swings in the vertical plane. The string hits a peg located a distance d below the point of suspension. What is the minimum value of d if the pendulum is released from rest at the horizontal position (0=90) and is to swing in a complete circle centered on the peg.

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