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NEET Sample Paper NEET Sample Test Paper-73

  • question_answer
    A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is

    A) 550 N               

    B) 50 N

    C) 250 N               

    D) 250 dyne

    Correct Answer: B

    Solution :

    \[u= velocity of bullet\] \[\frac{dm}{dt}= Mass thrown per second by the machine gun\]= Mass of bullet \[\times \] Number of bullet fired per second \[= 10 g \times  10 bullet/sec = 100 g/sec = 0.1 kg/sec\] \[\therefore \,\,\,\,Thrust\,\,=\,\,\frac{udm}{dt}\,\,=\,\,500\times 0.1=50\,\,N\]


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