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General
Easy

Question

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 T1

  1. Draw a diagram showing all forces acting on the ball    
  2. What is the tension in the lower string?    
  3. What is the net force on the ball at the instant shown in Figure?    
  4. What is the speed of the ball? Express all your answers in terms of L, m and T1.    

The correct answer is: What is the speed of the ball? Express all your answers in terms of L, m and T1.

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