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NEET Sample Paper NEET Sample Test Paper-80

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

    A)  1150 N            

    B)  1250 N

    C)  1300 N            

    D)  1420 N

    Correct Answer: B

    Solution :

    Required force \[F=\mu {{\,}_{AB}}\,{{R}_{A}}+{{\mu }_{BS}}\,{{R}_{B}}\] \[= \,0.25 \times 100g +\frac{1}{3}-\,\,\left( 100 + 200 \right)g\] \[=\,\,\,25g\,\,+\,\,100g\] \[=\,\,\,125g =125\times 10\] \[=\,\,\,1250\,\,N\]


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