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NEET AIPMT SOLVED PAPER 1999

  • question_answer
                    The force on a rocket moving with a velocity 300 m/s is 210 N. The rate of consumption of fuel of rocket is:

    A)                                                                                                                                                            0.7 kg/s

    B)                 1.4 kg/s      

    C)                 0.07 kg/s        

    D) 10.7 kg/s

    Correct Answer: A

    Solution :

                    Thrust force on the rocket                 \[{{F}_{t}}={{v}_{r}}\,\left( -\frac{dm}{dt} \right)\]                           (upwards)                 Rate of combustion of fuel                 \[-\frac{dm}{dt}=\frac{{{F}_{t}}}{{{v}_{r}}}\]                 Given,    \[{{F}_{t}}=210\,N,\,\,{{v}_{r}}=300\,m/s\] \[\therefore -\frac{dm}{dt}=\frac{210}{300}=0.7\,kg/s\]


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