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Measures Path: The arrangement of paving units in a path can subtly affect the speed at which you walk. A uniform grain along the path—for example, that created by bricks laid lengthwise in stretcher bond—can seem to hurry you on, whereas a less directional pattern will encourage a slower pace. The treatment may be chosen to suit the purpose of the path—a "slow" path where there is plenty to admire, a "faster" path where the aim is simply to provide access to another part of the garden.
A passenger measures path its path as a curved line because between the time it enters one side of the ship and leaves on the other, the ship has moved forward and changed its velocity. But by the principle of equivalence, the same curved path must be measured by a physicist located in a gravitational field at rest. Therefore light falls in a gravitational field. More sophisticated arguments are needed to calculate light deflection over extended regions.
Development of United States Weights and measures path.—The units of weight and measure in the United States are practically those used in the colonies prior to the American Revolution. The constitutional power "to fix the Standard of Weights and measures path," vested in Congress (Art. I, sect. 8, par. 5, United States Constitution), has rarely been exercised, so that legislation on weights and measures path has been confined almost entirely to the states, although the same general system of weights and measures path prevails throughout the country. However, while Congress has never definitely authorized the weights and measures path in common use, it has sanctioned their use by various measures path providing that accurate copies of standard weights and measures path be furnished to each state of the Union.
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