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# A ball of mass m is attached to a rigid vertical rod by means of two massless strings with length L. The strings are attached to the rod at points a distance L apart (see Figure). The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle. The tension in the upper string is

- Draw a diagram showing all forces acting on the ball.
- What is the tension in the lower string?
- What is the net force on the ball at the instant shown in Figure?
- What is the speed of the ball? Express all your answers in terms of L, m and

## The correct answer is: Draw a diagram showing all forces acting on the ball.

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