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NEET Sample Paper NEET Sample Test Paper-29

  • question_answer
    For a Rocket propulsion velocity of exhaust gases relative to rocket is 2 km/s. If mass of rocket system is 1000 kg, then the rate of fuel consumption for a rocket to rise up with acceleration \[4.9\text{ }m/{{s}^{2}}\]will be

    A)  \[12.25\text{ }kg/s\]   

    B)  \[17.5\text{ }kg/s\]

    C)  \[7.35\text{ }kg/s\]                 

    D)  \[5.2\text{ }kg/s\]

    Correct Answer: C

    Solution :

    Here  \[v\frac{dm}{dt}=m\,(4.9+9.8)=(14.7)\,m,\] \[v=2\,km/s,\,\,\,\,m=1000\] \[2000\frac{dm}{dt}=14.7\times 1000=\frac{dm}{dt}=\frac{14.7}{2}=7.35\,kg/s\]


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