Question

A machine gun fires a bullet of mass 40 g with a speed of 1200 ms–1. The person holding the gun can exert a maximum force of 144 N on it. The maximum number of bullets that can be fired from the gun per second is

Answer 1

Answer:

Given :   m=40 g =0.04 kg            v=1200  m/s            F=144 N

Let n be the number of bullets that can be fired per second.

The force exerted by man must balance the change in momentum of the bullets per second.

∴     F=mnv

OR    144=0.04×v×1200            ⟹n=3 bullets per second

Explanation:

Answer 2

Answer:

Explanation:

Given :   m=40 g =0.04 kg            v=1200  m/s            F=144 N

Let n be the number of bullets that can be fired per second.

The force exerted by man must balance the change in momentum of the bullets per second.

∴     F=mnv

OR    144=0.04×v×1200            ⟹n=3 bullets per second