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The chosen orbital altitude is a trade-off between the average thrust needed to counter-act the air drag and the impulse needed to send payloads and people to the station. GOCE which orbited at 255 km (later reduced to 235 km) used ion thrusters to provide up to 20 mN of thrust to compensate for the drag on its frontal area of about 1 m 2 .
To maintain a good pressure seal, the bore must be a precise constant diameter, or have a slight decrease in diameter from breech to muzzle. Any increase in bore diameter will allow the bullet to shift, allowing gas to leak past the bullet, decreasing velocity, or cause the bullet to tip so that it is no longer perfectly coaxial with the bore.
The value of the photosynthetic efficiency is dependent on how light energy is defined – it depends on whether we count only the light that is absorbed, and on what kind of light is used (see Photosynthetically active radiation). It takes eight (or perhaps ten or more [1]) photons to use one molecule of CO 2.
The Mona Lisa behind bulletproof glass at the Louvre Museum. Bullet-resistant body armor has been in use since about 1984. When law enforcement began wearing body armor, there was a dramatic drop in officer deaths, saving over 3,000 lives. [citation needed]
Warhead explosives have blast speeds of 20,000 ft/s (6,100 m/s) to 30,000 ft/s (9,100 m/s). As a result, they are capable of ejecting fragments at very high speeds of over 3,300 ft/s (1,000 m/s), implying very high energy (where the energy of a fragment is 1 ⁄ 2 mass × velocity 2, neglecting rotational energy). The military engineering data ...
As presented in the early films, a lightsaber's energy blade can cut, burn, and melt through most substances with little resistance. [4] It leaves cauterized wounds in flesh, but can be deflected by another lightsaber blade, by energy shields, or by the metal beskar (found in Mandalorian armor) and phrik (the metal used to create electrostaffs ...
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Bulletproof vests work by dissipating the bullet's energy in another way; the vest's material, usually Aramid (Kevlar or Twaron), works by presenting a series of material layers which catch the bullet and spread its imparted force over a larger area, hopefully bringing it to a stop before it can penetrate into the body behind the vest.