Question

A machine gun fires bullets of 50 gm at the speed of 1000 m/sec. If an average force of 200 N is exerted on the gun, the maximum number of bullets fired per minutes is:

• A. 240
• B. 180
  
• C. 60
• D. 30

Answer 1

The correct option is A 240

Mass of bullet

$m=0.05Kg$

$v=1000m/s$

$F=200N$

Force on the man is equal to the change in momentum of the bullets coming out of the gun

$F=\frac{mvn}{t}$

$200=\frac{0.5\times 1000\times n}{1}$

$n=4per\sec ond$

$n=240perminute$