A machine gun has a mass of 20kg. It fires 30g bullets at the rate of 400 bullets per second with a speed of 400 m/s. What force must be applied to the gun to keep it in position ?
In the given problem,
m g =20kg ; v B =400m/s
mass of the bullet = 30g = 30×10 -3 kg
no. of bullets fired/sec = 400
For t = 1sec.
Total mass of bullets in 1second , = (400×30)/1000=12 kg