A gravity railroad is a railroad on a steep slope, usually serving a mine at the top. Cars full of minerals go down the slope via gravity. Either the cars are then hauled back up the slope using power, or the weight of the descending loaded truck pulls the connected empty truck back up to the top. Sometimes the tracks going down and up are separate, and are known as the heavy track and light track, respectively. This is the top-level page of WikiProject trains Rail tracks Rail transport refers to the land transport of passengers and goods along railways or railroads. ... In mathematics, the slope (or gradient, especially where three or more dimensions are discussed) of a straight line (within a Cartesian coordinate system) is a measure for the steepness of said line. ... The El Chino Mine located near Silver City, New Mexico is an open-pit copper mine Mining is the extraction of valuable minerals or other geological materials from the earth, usually (but not always) from an ore body, vein, or (coal) seam. ... This article covers the physics of gravitation. ...
A body falling freely toward the surface of the earth undergoes an acceleration due to gravity of 32 ft/sec 2 (9.8 m/sec 2), which is symbolized by g.
For a tall building, where the pressure from the mains at street level is insufficient to raise the water to the upper floors, water is pumped up to the standpipe and fed by gravity into the system.
A comparison of reagent strips and the refractometer for measurement of urine specific gravity in hospitalized children.
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