Question

A machine gun of mass 10kg fires1/50 kg bullets at the rate of 10 bullets /s with a speed of 500m/s.What force is required to hold the gun in position?

Answer 1

Here , when bullet is fired conservation of momentum takes place .
Momentum of bullet in one bullet = mass×velocity
=( 0.02 kg )(500 m/s) = 10 kg m/s
Force =Rate of change of momentum = bullet per second ×Momentum of bullet
= 100N
force required to hold the gun in position is 100 N