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Manipal Engineering Manipal Engineering Solved Paper-2009

  • question_answer
     A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distance from the hinges for opening or closing the door is

    A)  1.2 N

    B)                                         3.6 N

    C)  2.4 N                    

    D)         4 N

    Correct Answer: D

    Solution :

    Here, torque\[\tau =1.6\times 1=1.6\,\,N-m\] So, when\[d=0.4\,\,m\],                 \[F=\frac{\tau }{d}=\frac{1.6}{0.4}=4\,\,N\]


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