A bullet leaves a gun barrel because it is forced out by the pressure of burning gasses.
Yes. Denser air slows the bullet more, and lowers the strike of the bullet.
The gas propelling the bullet is tapped, and operates the bolt mechanism.
When the powder is ignited, it starts a chemical reaction which creates gases. As these gases expand, the pressure separates the bullet from the casing, and propels the bullet down the barrel.
In order to reduce friction it is important that the inside of the barrel be highly polished. Also the gas pressure (from the explosion of the charge) on the bullet is what drives the bullet and in order to maximize the pressure there cannot be much gas leakage areound the bullet in the barrel....so the bullet can slide through quicker, easier, and smoother.
it is hypothesized that he ring pop increases blood pressure the highest
the high pressure sensor is mounted on the back of the a/c compressor with a snap ring and sealed with an "o" ring.
Because the bullet shoots out and let's a big bang of pressure
yes
Depends on the gun, the bullet, amount of propellant, angle of firing, rifling, temperature, air pressure, humidity etc An average military assault rifle can fire a bullet almost three miles on optimal trajectory.
powder
It's unlikely, but possible. A bullet fired through the skin of the plane (through aluminum) will make a small hole, which will cause a pressure leak. The cabin pressure system can compensate for several such leaks. If a bullet is fired through a window, the window might blow out, causing the cabin to lose pressure fairly quickly--the cabin pressure system can't compensate for a hole that big. While that is hazardous to the passengers, it won't bring down the plane. (Although, the pilots will immediately dive to a lower altitude to recover some cabin pressure). A bullet that punctures a fuel tank or fuel line might lead to a fire which would bring down the plane.