Collision

A collision is an event in which two or more bodies exert forces on each other for a relatively short time. Although the most common colloquial use of the word "collision" refers to incidents in which two or more objects collide, the scientific use of the word "collision" implies nothing about the magnitude of the force.

Some examples of physical interactions that scientists would consider collisions:

Some colloquial uses of the word collision are:

Overview

Collision is short-duration interaction between two bodies or more than two bodies simultaneously causing change in motion of bodies involved due to internal forces acted between them during this. Collisions involve forces (there is a change in velocity). The magnitude of the velocity difference at impact is called the closing speed. All collisions conserve momentum. What distinguishes different types of collisions is whether they also conserve kinetic energy. Line of impact – It is the line which is common normal for surfaces are closest or in contact during impact. This is the line along which internal force of collision acts during impact and Newton's coefficient of restitution is defined only along this line.

Collisions (album)

Collisions, is the fourth album from New York-based Calla.

Track listing

References

Cobalt

Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.

Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass, but the color was later thought by alchemists to be due to the known metal bismuth. Miners had long used the name kobold ore (German for goblin ore) for some of the blue-pigment producing minerals; they were so named because they were poor in known metals, and gave poisonous arsenic-containing fumes upon smelting. In 1735, such ores were found to be reducible to a new metal (the first discovered since ancient times), and this was ultimately named for the kobold.

Today, some cobalt is produced specifically from various metallic-lustered ores, for example cobaltite (CoAsS), but the main source of the element is as a by-product of copper and nickel mining. The copper belt in the Democratic Republic of the Congo, Central African Republic and Zambia yields most of the cobalt mined worldwide.

Cobalt (video game)

Cobalt is an action-oriented side-scrolling video game in development by Oxeye Game Studio and published by Mojang. It was released on February 2, 2016 for Microsoft Windows. In addition to the computer versions, a port is being developed for the Xbox 360 and Xbox One.

Gameplay

Cobalt features several different game modes that are available, such as Capture the Plug (a variation of capture the flag), Deathmatch, TeamStrike (with one life each, inspired by Counter-Strike), Survival, and an upcoming Adventure mode. Along with these features, players can create their own maps with the map editor in-game.

Players play as the main character, known as Cobalt. Some key mechanics of the game include bullet time, rolling (to deflect bullets) and punching which can deal damage and knock back explosives. All of which a player can combo together to produce an advanced level of play.

Development

Alpha

Cobalt was released in its alpha stage of development. Updates to subsequent versions of the game are free. The alpha version was initially solely available for the Windows operating system. A Mac OS X version was released on June 27, 2013, but the game was re-announced as a Xbox 360, Xbox One and Windows 10 exclusive in Gamescom 2014.

Cobalt blue

Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with alumina at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl₂O₄. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and has historically been used as a coloring agent in ceramics, (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.

Historical uses and production

Cobalt blue in impure forms had long been used in Chinese porcelain, but it was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard in 1802. Commercial production began in France in 1807. The first recorded use of cobalt blue as a color name in English was in 1777. The leading world manufacturer of cobalt blue in the 19th century was Benjamin Wegner's Norwegian company Blaafarveværket, ("blue colour works" in Dano-Norwegian). Germany was also famous for production, especially the blue colour works (Blaufarbenwerke) in the Ore Mountains of Saxony.