The AFC Champions League is a football competition between the best club teams in Asia. The teams are selected because of good performances in matches. South Korea is the country that has the most titles for a team. Pohang Steelers got the most titles.
Raptor
Raptor can mean:
Newton's laws of motion
Isaac Newton (1642–1727) is widely known as the father of dynamics, the study of motion. He developed three laws that are the foundation of classical mechanics. They are believed to be true because the results of experiments by scientists agree with his laws.
A "uniform velocity" means that an object moves at a constant speed without changing direction (i.e. in a straight line). A "net force" means that the forces acting on the object are not balanced. In other words, the first law states two things:
The first part states that a table resting on the ground will not move unless pushed. Although gravity is acting on the table, pulling it down, there is a "reaction force" from the ground which is pushing it back. The forces acting on the table are "balanced", so the object will not move.
The second part is harder to explain. A ball rolling along a flat surface will slow down and eventually come to a halt. This is because of friction, which is a force that slows the ball down. A ball rolling down a slope is also affected by friction, but the effect of the force of gravity is stronger than the friction, so there is a net force acting in the direction in which the ball is moving. In a place without the forces of friction, air resistance and gravity (e.g. in outer space) a moving object would keep on moving in a straight line if there were no force to slow it down or change its direction.
Newton's second law states that acceleration of a particle is dependent on the forces acting upon the particle and the particle's mass. For a given particle, if the net force is increased, the acceleration is increased. For a given net force, the more mass a particle has, the less acceleration it has.
For example, weight is a force that we feel on Earth, caused by the gravity. The weight on a particle is given by
where is the mass of the particle and is the local gravitational acceleration (not to be confused with "G", the universal gravitational constant), roughly equal to 9.8 meters per second (32 feet per second) on Earth.
We can express Newton's second law in terms of momentum. The momentum of a particle is defined as the product of its mass and velocity :
The acceleration of a particle is the time derivative of its velocity :
Therefore,
Thus, we have another way of stating Newton's second law:
In classical mechanics, the two forms of the second law, formula_1 and formula_6, are completely equivalent. Note that we assume that the mass of a particle does not change.
This is best understood with billiard balls, where you can easily see the action/reaction pairs of forces. Likewise, when you kick a football, not only does the ball move, but you feel a force on your foot.
The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
A variety of action-reaction force pairs are evident in nature. Consider the propulsion of a fish through the water. A fish uses its fins to push water backwards. But a push on the water will only serve to accelerate the water. Since forces result from mutual interactions, the water must also be pushing the fish forwards, propelling the fish through the water. The size of the force on the water equals the size of the force on the fish; the direction of the force on the water (backwards) is opposite the direction of the force on the fish (forwards). For every action, there is an equal (in size) and opposite (in direction) reaction force. Action-reaction force pairs make it possible for fish to swim.
Consider the motion of a car on the way to school. A car has wheels which spin forwards. As the wheels spin forwards, they grip the road and push the road backwards. Since forces result from mutual interactions, the road must also be pushing the wheels forward. The size of the force on the road equals the size of the force on the wheels (or car); the direction of the force on the road (backwards) is opposite the direction of the force on the wheels (forwards). For every action, there is an equal (in size) and opposite (in direction) reaction. Action-reaction force pairs make it possible for cars to move along a roadway surface.
Fencing
"This is about the sport. You may be wanting to read about a fence."
Fencing is a sport that includes two people with swords. The aim is to score hits. There is also a referee.
In the olden times when two people argued they fenced the first one to draw blood was wrong and the person would be dead, so the person that won would claim the dead person's house and belongings.
The foil is a light and easy to bend weapon, first made in mid 17th century as a weapon for practice. 'Hits' can only be scored by hitting the target area with the point of the sword. The target area is the torso.
The épée is the heaviest of the three weapons. To score a hit, the push-button on the end of the weapon must remain fully down for 2-10 milliseconds, and must arrive (hit) with a force of at least 7.35 newtons. The target area for Épée is the entire body. This includes the feet and the head.
The sabre is the "cutting" weapon, with a curved guard (to protect the hand) and a triangular blade. However, in modern electric scoring, a touch with any part of the sabre, (point, flat or edge, as long as it is on target) will count as a hit. The target area in sabre is everything from the waist up, except for the hands.
Fencers wear a uniform to avoid injury. They wear a mask of black mesh with a bib. Also, a jacket, short pants and a sort of half-a-shirt (called an underarm protector or plastron), all of white fabric. They must also wear socks that cover their legs. Women must wear a chest protector. These are collectively called "whites."
Administrator
Administrators are people who organize things like businesses. All businesses have administrators. They make decisions, organize the people who work there and make sure that things are working alright and there are no problems. Their work is called "administration". The administrators are part of the "management".
An administrator is also the person in charge of some of the small territories of the United Kingdom, for example Ascension Island and the British Antarctic Territory which are too small to run their own government.
Geneva Conventions
The Geneva Conventions are a set of four treaties of international law at wartime. They were formulated in Geneva, Switzerland. All of the four treaties are about humanitarian issues. The Swiss Henri Dunant was the person who started the creation of the Conventions. He did this after he saw the unimaginable cruelty of the Battle of Solferino in 1859.
Some parts of the four Geneva Conventions say that all countries who signed must create national laws to make violations of the Geneva Conventions a crime.
The conventions and their agreements are as follows:
In addition, there are three more protocols to the Geneva Conventions:
After the First Convention was agreed, the International Committee of the Red Cross was founded in 1863.
All four conventions were last checked and agreed on in 1949. Those versions are related to previous revisions. In some cases, ideas from the 1907 Hague Convention were added. Usually, people refer to all four conventions as the "Geneva Conventions of 1949" or simply the "Geneva Conventions". Later conferences have added text that makes it illegal to use certain kinds of warfare, like chemical warfare. They have also spoken about issues of civil wars.