Question

A machine gun fires 120 bullets per minute each of mass 50 g with a speed of 400 m/s. The power of machine gun is

Answer 1

Answer:

2mv

Explanation:

We know that Force is directly proportional to change in momentum.

Momentum of the bullets => ( mass of one bullet × speed of one bullet ) × no. of bullets fired per unit time

Mass of one bullet=m

Speed of the bullet=v

No. of bullets fired=120

And time taken=60 second

So Force => 120×v×m/60 second

             =>120mv/60

             =>2mv

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Answer 2

Answer:

2mv

Explanation:

We know that Force is directly proportional to change in momentum.

Momentum of the bullets => ( mass of one bullet × speed of one bullet ) × no. of bullets fired per unit time

Mass of one bullet=m

Speed of the bullet=v

No. of bullets fired=120

And time taken=60 second

So Force => 120×v×m/60 second

            =>120mv/60

            =>2mv

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