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A small ball of mass ? is attached to the bottom end a light string of...

A small ball of mass ? is attached to the bottom end a light string of length ?, while the top of the string is fixed to the ceiling. If the ball is moving in a horizontal circle of radius ?, derive an expression for the angular speed ? of the ball in terms of only ?, ?, ? and ?. Such a system is called a conical pendulum.

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