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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Conservation of Linear Momentum and Impulse

  • question_answer
    A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is          [NCERT 1978]

    A)                         Zero                

    B)                         500 N            

    C)                         1000 N          

    D)                         2000 N

    Correct Answer: B

    Solution :

                                \[F=u\left( \frac{dm}{dt} \right)=500\times 1=500\ N\]            


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