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  4. 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 :

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Q. 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 :

JamiaJamia 2004

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