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NEET Sample Paper NEET Sample Test Paper-66

  • question_answer
    Block A weighing 100 kg rests on a block B and is tied with a horizontal string to the wall at C. Block B weighs 200 kg. The coefficient of friction between A and B is 0.25 and between B and the surface is \[1/3\]. The horizontal force P necessary to move the block B should be \[\left( g = 10m/{{s}^{2}} \right)\]

    A) 1150 N             

    B) 1250 N

    C) 1300 N             

    D) 1420 N

    Correct Answer: B

    Solution :

    Friction between block A and block B and between block B and surface will oppose the P \[\therefore \,\,\,\,P={{F}_{AB}}+{{F}_{BS}}\] \[=\,\,{{\mu }_{AB}}{{m}_{A}}g\,\,+\,\,{{\mu }_{BS}}\,({{m}_{A}}+{{m}_{B}})\,g\] \[=\,\,0.25\times 100\times 10+\frac{1}{3}\,(100+200)\times 10\] \[=\,\,1250\,N\]


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