At least ten feet thick. This would depend on the weapon used to fire the bullet - an airgun pellet wouldn't require much of a wall, whilst an armour-piercing round from a high-velocity rifle would require a very thick one.
When an object is close to your eye, the lens becomes thicker. This is because the ciliary muscles surrounding the lens contract, allowing the lens to change its shape and increase its refractive power to focus on nearby objects.
Human bones can vary in thickness depending on the specific bone and individual, but on average, they can range from a few millimeters to a few centimeters. For example, skull bones tend to be thicker than finger bones.
Fudi
The cell wall of gram positive bacteria is thick.
The thick bark of a redwood tree helps protect it from fires, insect infestations, and extreme weather conditions. It also helps to retain moisture within the tree, providing a buffer against dry conditions.
It is how thick a bullet is, measured through the thickest part of the bullet, from one side to the other.
Bullet
depends how thick the platinum is
It is not bulletproof. If it is thick enough it can slow down or stop a bullet depending on caliber.
It depends on how thick the Kevlar vest is.
An AK-47 can put a bullet through a 1/4 inch thick part of titanium, so anything around 2 inches or thicker should stop a bullet, it depends on how powerfull the gun is, but the thicker the titanium the better, if i wanted a sheet of bulletproof titanium i would make it at least 5 inches thick if not 6 inches.
If you mean the jacket, it all depends on the caliber and maker.
6cm
THIS DEPENDS ON TYPE OF WOOD AND HOW DRY IT IS, A 2 INCH THICK TREE( WET) WOULD PROBABLY STOP THE BULLET
First, nothing is bullet proof. Things can be bullet resistant. Second, it would depend on the form that carbon is in. Carbon is not usually used as a bullet resistant material. Diamond- a pure form of carbon, is very hard but brittle- a bullet would shatter it.
The skin of a hippopotamus is thick enough to be bullet proof to a average shot in most places. At it's thickest it's roughly 3cm and ways around a ton alone.
In a pure sense, it is a measure of the diameter of a bullet, usually given in decimal fractions of an inch (a .357 bullet is about.357 inches thick) In a broader sense, it is the cartridge that a given weapon will fire- such as caliber .38 Special, or caliber 30-06.