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Question

Physics Question on Power

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

Answer

600 W

Explanation

Solution

Here : Number of bullets n = 360, Time = 1 minute =60 sec, Mass of bullet = T1T2=xmgx+mg(GivenT1T2=35)\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 35=xmgx+mg\frac{3}{5}=\frac{x-mg}{x+mg} Now power of gun is given by 3x+3mg=5x5mg3x+3mg=5x-5mg x=4mgx=4mg = 600 watt