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Question

The dumbell is placed on a frictionless horizontal table. Sphere A is attached to a frictionless pivot so that B can be made to rotate about A with constant angular velocity. If B makes one revolution in period P, the tension in the rod is

  1. fraction numerator 4 pi to the power of 2 end exponent M d over denominator P to the power of 2 end exponent end fraction    
  2. fraction numerator 8 pi to the power of 2 end exponent M d over denominator P to the power of 2 end exponent end fraction    
  3. fraction numerator 4 pi to the power of 2 end exponent M d over denominator P end fraction    
  4. fraction numerator 2 M d over denominator P end fraction    

The correct answer is: fraction numerator 8 pi to the power of 2 end exponent M d over denominator P to the power of 2 end exponent end fraction

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