Physics-
General
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Question

Three identical spheres, each of mass 1 kg are kept as shown in figure below, touching each other, with their centers on a straight line. If their centres are marked P,Q, R blankrespectively, the distance of centre of mass of the system from P is

  1. fraction numerator P Q plus P R plus Q R over denominator 3 end fraction    
  2. fraction numerator P Q plus P R over denominator 3 end fraction    
  3. fraction numerator P Q plus Q R over denominator 3 end fraction    
  4. fraction numerator P R plus Q R over denominator 3 end fraction    

The correct answer is: fraction numerator P Q plus P R over denominator 3 end fraction


    ) fraction numerator P Q plus Q R plus P R over denominator 6 end fraction
    Distance of centre of mass from P is
    r equals fraction numerator r subscript 1 end subscript plus r subscript 2 end subscript plus r subscript 3 end subscript over denominator 3 end fraction equals fraction numerator 0 plus P Q plus P R over denominator 3 end fraction equals fraction numerator P Q plus P R over denominator 3 end fraction

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