Physics-
General
Easy

Question

Two forces, each equal to F, act as shown in figure. Their resultant is

  1. fraction numerator F over denominator 2 end fraction    
  2. F    
  3. square root of 3 blank F    
  4. square root of 5 blank end root F    

The correct answer is: F


    Note that the angle between two forces is 120degree and not 60degree.
    R to the power of 2 end exponent equals F to the power of 2 end exponent plus F to the power of 2 end exponent plus 2 F to the power of 2 end exponent c o s 120 degree
    or R to the power of 2 end exponent equals 2 F to the power of 2 end exponent plus 2 F to the power of 2 end exponent open parentheses negative fraction numerator 1 over denominator 2 end fraction close parentheses equals F to the power of 2 end exponent
    or R equals F

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