Question

A machine gun has a mass of 20kg.it fires 30g bullets at rate of 400 bullets per second with a speed of 400m/s.what force must be applied to the gun to keep it in position.

Answer 1

Answer:

The force must be applied to the gun to keep it in position is 4800 N.                                          

Step-by-step explanation:

Given : A machine gun has a mass of 20 kg. It fires 30 g bullets at rate of 400 bullets per second with a speed of 400 m/s.

To find : What force must be applied to the gun to keep it in position?

Solution :

Mass Of Machine Gun m= 20 kg

Mass of each Bullet, M=30 g=0.030 kg

Velocity Of Bullet v=400 m/s

No. of Bullets = 400

Let V be the recoil velocity,

So, $V=\frac{Mv}{m}$

$V=\frac{0.030\times 400}{20}$

$V=0.6 m/s$

Time taken to fire on bullet is $t=\frac{1}{400}$ seconds

The force must be applied to the gun to keep it in position is

$F=\frac{mV}{t}$

$F=\frac{20\times 0.6}{\frac{1}{400}}$

$F=20\times 0.6\times 400$

$F=4800N$

Therefore, The force must be applied to the gun to keep it in position is 4800 N.

Answer 2

Answer:

Clear and simple method

Refer attachment

HOPE THIS ANSWER IS HELPFUL

PLS MARK HAS BRAINLIEST