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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2004

  • question_answer
        From an automatic gun a man fires 360 bullets per minute with a speed of 360 km/hour. If each weighs 20 g, the power of the gun is :

    A)  600 W                                  

    B)  300 W

    C)  150 W                                  

    D)  75 W

    Correct Answer: A

    Solution :

                    Here : Number of bullets n = 360, Time = 1 minute =60 sec, Mass of bullet = \[\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{x-mg}{x+mg}\left( \because \,\,\,Given\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{3}{5} \right)\] Velocity v = 360 km/hr \[\frac{3}{5}=\frac{x-mg}{x+mg}\] Now power of gun is given by \[3x+3mg=5x-5mg\] \[x=4mg\] = 600 watt


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