Question: A ring 1.5 m in diameter is pivoted at one point on its circumference so that it is free to rotate about a horizontal axis.

A ring 1.5 m in diameter is pivoted at one point on its circumference so that it is free to rotate about a horizontal axis. Initially, the line joining the support and center is horizontal.

(a) If released from rest, what is its maximum angular velocity?

(b) What must its initial angular velocity be if it is to just make a complete revolution?

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