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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Second Law of Motion

  • question_answer
    Gravels are dropped on a conveyor belt at the rate of 0.5 kg/sec. The extra force required in newtons to keep the belt moving at 2 m/sec is                                 [EAMCET 1988]

    A)                         1                     

    B)                         2            

    C)                         4                     

    D)                         0.5

    Correct Answer: A

    Solution :

                                Opposing force \[F=u\ \left( \frac{dm}{dt} \right)=2\times 0.5=1\ N\]                                  \[\left( \text{As,}\ F=u\frac{du}{dt} \right)\]             So same amount of force is required to keep the belt moving at 2 m/s          


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