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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        A force of 49 N is just able to move a block of wood weighing 10 kg on a rough horizontal surface. Its coefficient of friction is

    A)  1                            

    B)  0.7

    C)  0.5                        

    D)  zero

    Correct Answer: C

    Solution :

                    For block to move \[\therefore \]  \[F=\mu R\] \[\mu =\frac{F}{R}=\frac{F}{mg}\] Given, \[F=49N,m=10kg,\,\,g=10m{{s}^{-2}}\]                 \[\mu =\frac{49}{10\times 10}\]                 \[=0.49\approx 0.5\]


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