Originally posted by |-|05|:
the shot gun will not fly......but the recoil of it is very very heavy....i've fired 1.....the shotgun was made to basicly maim a person.....and it's effective range is a mere 20m!!
As for bullets the recoil force is less then what is given off when u fire due to energy being dissipated to sound and also cuz it's expending gases that propels the bullet not pure brute force....also the length of barrel also plays a part in how much recoil there is and how much power is needed blah blah.....
Erm, I think you mixed up your laws of physics liao. Firstly, the energy imparted to the bullet will includes all the propulsive kenitic energy afforded to it by the expanding gases, and that sum total of KE is obtained after subtracting all the other energy conversions (light, sound, heat). If the KE of the bullet as you suggested, that would violate the law of conservation of energy.
The "pure brute force" you refered to here is not a seperate entity from the expanding gases, they are one and the same. As the gases expand and the projectile is propelled forward, the reaction force in the opposite direction generated will always be the same as the force throwing the projectile forward. That means the recoil force will be equal to the force of the bullet.
As of such, it is
impossible to have a recoil force
less then the propulsive force of the bullet because that would violate newton's law of motion, which is completely seperate from the law of conservation of energy. You appear to have the concepts mixed up.
but on the whole steel helmets can and stop bullets cuz the soft tip bullet which is built the kill infantry will smash on inpact.......
As far as I note, most armies used jacketed bullets as opposed to the hollowpoints you suggested. They will blast through the steel helmet will no problem and it will be nothing more then a pot for spilled brains.
As a matter of fact, I suspect even hollowpoints can penetrate a steel helmet, the steel is thin enuff to allow that. That's becos a typical rifle bullet contains about 1,500-3,000 joules of energy, concentrated on a spot, more then enuff to exceed the mechnical strength and thickness of the steel helmet. The inner lining is no problem.