NEET Sample Paper NEET Sample Test Paper-39

  • question_answer 7) Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be

    A)  Mv newton   

    B)  2 Mv newton

    C)  \[\frac{Mv}{2}\]newton  

    D)  zero

    Correct Answer: A

    Solution :

    Force required, \[F=\frac{d(mv)}{dt}\] \[=v\left( \frac{dm}{dt} \right)=v\,M\] as velocity v is constant, hence F = Mv newton

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