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The word race comes from a Norse word. This Norse word arrived in France during the invading of Normandy and gave the word raz which means “swift water” in Brittany, as in a mill race; it can be found in Aircraft orange polo shirt “Pointe du Raz” , and “raz de marée” . The word race to mean a “contest of speed” was first recorded in the 1510s. A race and its name are often associated with the place of origin, the means of transport and the distance of the race. As a couple of examples, see the Dakar Rally or the Athens Marathon. Running a distance is the most basic form of racing, but races may be conducted in vehicles, such as boats, cars, motorcycles, bicycles and aircraft; or with animals such as horses or dogs. Races may also be conducted with other modes of transport such as skis, sleds, skates or wheelchair; or other forms of movement such as swimming or walking. In a relay race members of a team take turns in racing parts of a circuit or performing a certain racing form.
Flight is the process by which an object moves through an atmosphere without contact with the surface. This can be achieved by generating aerodynamic lift associated with propulsive thrust, aerostatically using buoyancy, or by ballistic movement. Many things can fly, from natural aviators such as birds, bats, and insects, to human inventions like aircraft, including airplanes, helicopters, balloons, and rockets which may carry spacecraft. The engineering aspects of flight are the purview of aerospace engineering which is subdivided into aeronautics, the study of vehicles that travel through the air, and astronautics, the study of Aircraft orange polo shirt vehicles that travel through space, and ballistics, the study of the flight of projectiles.
Most species of insects can fly as adults. Insect flight makes use of either of two basic aerodynamic models: creating a leading edge vortex, found in most insects, and using clap and fling, found in very small insects such as thrips. Aerodynamic lift is created by the motion of an aerodynamic object through the air, which due to its shape and angle deflects the air. For sustained straight and level flight, lift must be equal and opposite to weight. In general, long narrow wings are able deflect a large amount of air at a slow speed, whereas smaller wings need a higher forward speed to deflect an equivalent amount of air and thus generate an equivalent amount of lift. Large cargo aircraft tend to use longer wings with higher angles of attack, whereas supersonic aircraft tend to have short wings and rely heavily on high forward speed to generate lift.
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