Question

The machine guns fire a bullet of mass 40g with a velocity 1200m/s . the man holding it , can exert a maximum force of 144N on the gun . How many bullets can he fire per second at the most ? ​

Answer 1

Explanation:

Given that, m=40g =0.04 kg

v=1200 m/s

and 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.

Hence, F = mnv

=>144 = 0.04×n×1200

=> 144 = 4×n×12

=>36 = n× 12

=> n = 3

Hope it will help you ♥️

Answer 2

Explanation :- force exerted by machine gun on man's hand in firing a bullet = change in momentum per second on a bullet or rate of range of momentum .

• =( 40/1000) × 1200 = 48N
• Force exerted by man on machine gun = 144N

Hence, number of bullets fired = 144/48

= 3 Answer

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