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General
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Question

A light semi cylindrical gate of radius R is piovted at its mid point O, of the diameter as shown in the figure holding liquid of density r. The force F required to prevent the rotation of the gate is equal to

  1. 2 pi R to the power of 3 end exponent rho g    
  2. 2 rho g R to the power of 3 end exponent    
  3. 2 pi R to the power of 3 end exponent p g (B) 2 rho    
  4. none of these    

The correct answer is: none of these

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