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Typical arrastra construction. From Mining and Scientific Press 52 (1886): 237. Arrastra demonstration in Liberty, Washington, 2007. An arrastra (or arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver ore.
The concurso de arrastre (Spanish for "dragging test") is a pulling game where oxen or cows drag a weight. It is also known as tiru güeis , tira bueis ( Cantabrian for "oxen pulling"), arrastre de narras , arrastre de basnas ("sleigh dragging"), arrastre de piedra ("stone dragging") or simply arrastre ("dragging").
Drag coefficients in fluids with Reynolds number approximately 10 4 [1] [2] Shapes are depicted with the same projected frontal area. In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.
In fluid dynamics, drag, sometimes referred to as fluid resistance, is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. [1]
Barrida (arrastre) Dragging: One partner sweeps the others foot by displacing it along the floor. Bicicleta: Pedaling: Movement which resembles pedaling on a bicycle. Induced by the leader placing his foot under or to the side of the follower's foot and lifting and lowering it. Empujadita: Small push: Displacement of the follower's leg by the ...
The equation is precise – it simply provides the definition of (drag coefficient), which varies with the Reynolds number and is found by experiment. Of particular importance is the u 2 {\displaystyle u^{2}} dependence on flow velocity, meaning that fluid drag increases with the square of flow velocity.
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Form drag arises because of the shape of the object. The general size and shape of the body are the most important factors in form drag; bodies with a larger presented cross-section will have a higher drag than thinner bodies; sleek ("streamlined") objects have lower form drag.