In many wars, and you fight a lot of warrior heroes who exchange their lives for the lives of entire families, we will also see such scenes.
To celebrate victory, or to hold funerals for fallen comrades, soldiers would often concentrate on firing their guns. That is, shooting into the sky to comfort the undead, extremely shocking. Where will the bullets fired in the sky end up? Will it cause harm to yourself?
First of all, let's briefly understand the common sense of bullets
Bullets, a combination of physics, chemistry, materials science, aerodynamics and technology. It is generally composed of four parts: projectile, shell, propellant, and fire cap (commonly known as bottom fire).
This basic structure is self-propelled, and there is basically no change.
Projectiles rely on rapid flight to penetrate targets. When fired, the firing pin activates the fire cap. The primer burns rapidly, igniting the propellant in the cartridge; the propellant burns instantaneously, creating high temperatures and high pressures that squeeze the projectile out of the cartridge.
At this time, the projectile will move forward under the strong push of high pressure; at the same time, it will be squeezed by the rifling, produce rotation, and finally be pushed out of the chamber.
Bullet firing dynamics
Because the bullets used in the rifle are pointed, the flight speed is much faster than that of the pistol, about 500 meters / per second;
More powerful sniper rifles and heavy machine guns not only have a long range, but also a faster rate of fire, reaching more than 1000 meters per second.
When a bullet is fired, it is affected by the Earth's gravity and forms a parabola. The speed of free fall also increases, reaching 80 meters per second.
And a bullet, when the flight speed reaches 60 meters / per second, will cause great damage to the human body.
Combined with the previous questions, make an inappropriate assumption:
If you shoot at the sky at a 90-degree angle, after the bullet kinetic energy is exhausted, it will naturally fall back to the original point, eventually hitting the shooter himself.
Although this probability is very low, it does lead to too many tragedies -
02
The first incident of self-inflicted injury occurred in Iraq in 2003.
At that time, in a battle, the Iraqi army was victorious. Both the military and the people were very excited.
Since the excitement is difficult to suppress, it means that it is expressed, vent and vent. So many soldiers raised their guns and pointed themselves at the sky.
Dada
And they never expected that in just a few seconds, many comrades around them were suddenly shot and fell to the ground and died.
It's an attack! Fight now!
At the time, people really thought that the enemy had launched a surprise attack. However, a long time has passed since entering the state of combat readiness, and the wind and waves are still calm and calm, and there is no abnormality.
The enemy did not come, and who killed his comrades-in-arms?
People were puzzled, and when they examined the corpse carefully, they were shocked to find that they had been killed by a bullet fired into the sky by their own side!
The second tragedy occurred in the Philippines in 2012.
At that time, the Philippine government was relatively lax in gun control, and whenever the New Year and Christmas came, people often fired guns into the sky to celebrate. Nor are you afraid to shoot Santa Claus who comes to deliver gifts.
In the Spring Festival of 2012, a number of policemen played hi, drew their guns and shot at the sky.
The police took the lead, and the people followed suit. For a moment, the sound of gunfire was deafening.
Soon, the people at the scene were shot one after another, and the wailing came and went.
According to statistics, more than 60 people were injured, and 1 person was hit and died on the spot, and the happy event directly turned into a funeral.
It is often said: How big a raindrop must this be to hit the head? Lo and behold, I've been tricked.
After official verification, the results showed that the culprit also came from the bullet used in the firing celebration.
This tragic case has made Filipinos take it as a warning. Since then, a special gun sealing ceremony has been held to prevent the recurrence of the past.
From the physics textbook, it can be seen that the starting point and the landing point of the parabola, the speed of the object is the same, which is a process in which kinetic energy is converted into gravitational potential energy, and gravitational potential energy is converted into kinetic energy.
Ideally, the muzzle of the bullet is fired at the same speed as when it lands on the ground.
When the bullet is flying at high speed, a part of the kinetic energy will be converted into heat energy due to the friction of air resistance.
In the meantime, the bullet has great flat motion and rotational kinetic energy. After returning to the ground, although the deadly rotational kinetic energy is greatly reduced, the flat movement energy is weakened less.
Considering that the warhead is pointed, it will exert greater pressure on the contact, so the power should not be underestimated.
This knowledge is too advanced, and some students gave examples of life to illustrate:
For example, smashing people up close with an egg. Three meters and five meters, except for the egg yolk of the other party's face, there may be nothing;
If the same egg is smashed from a height of 100 meters, the consequences will be very serious, and the concussion of the head will be light, and it will kill people if it is not good.
Refer to the lethality of high-altitude projectiles.
If it is made of bullets, it is so powerful that I imagine a little fear.
Many consider it alarmist and present empirical evidence to refute it.
For example —
Russian soldiers saluted
If there is danger, how can a soldier perform a gun salute?
But according to military fans, these guns are filled with empty package bullets, not physical bullets.
Moreover, China also promulgated the Gun Control Law in 1996, which clearly stipulates that shooting in the sky is prohibited.
Some students claimed that they had done such experiments specifically.
A 7.62mm bullet was fired and dropped, almost uncanny, wearing a thick piece of clothing can not penetrate, do not feel pain.
To tell the truth, Lao Wang's physical knowledge was almost taught by the physiology teacher; he had never been a soldier, so he knew very little about firearms.
So, is there any danger in shooting into the sky, and everyone will judge it?