NEET Sample Paper NEET Sample Test Paper-21

  • 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 :

    Power of gun \[=\frac{\text{Total}\,\text{K}\text{.E}\text{.}\,\text{of}\,\text{fired}\,\text{bullet}}{\text{time}}\] \[=\frac{n\times \frac{1}{2}m{{v}^{2}}}{t}=\frac{360}{60}\times \frac{1}{2}\times 2\times {{10}^{-2}}\times {{(100)}^{2}}=600\,W\] Hence, the correction option is (a).

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