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If two events happen at the same time in the frame of the first observer, they will have identical values of the t-coordinate. However, if they have different values of the x -coordinate (different positions in the x -direction), they will have different values of the t' coordinate, so they will happen at different times in that frame.
A time interval measured using a single clock that is motionless in a particular reference frame is called a proper time interval. [38] Fig. 4-3B illustrates these same two events from the standpoint of observer B, who is parked by the tracks as the train goes by at a speed of . Instead of making straight up-and-down motions, observer B ...
Possibilism in cultural geography is the theory that the environment sets certain constraints or limitations, but culture is otherwise determined by social conditions. [1] [2] In cultural ecology, Marshall Sahlins used this concept in order to develop alternative approaches to the environmental determinism dominant at that time in ecological studies.
1831: Electromagnetic induction was discovered by Michael Faraday in England in 1831, and independently about the same time by Joseph Henry in the U.S. [38] 1831: Chloroform – Samuel Guthrie in the United States (July 1831), and a few months later Eugène Soubeiran (France) and Justus von Liebig (Germany), all of them using variations of the ...
In cosmology, the anthropic principle, also known as the observation selection effect, is the proposition that the range of possible observations that could be made about the universe is limited by the fact that observations are only possible in the type of universe that is capable of developing observers in the first place.
Murphy's law [a] is an adage or epigram that is typically stated as: "Anything that can go wrong will go wrong.".. Though similar statements and concepts have been made over the course of history, the law itself was coined by, and named after, American aerospace engineer Edward A. Murphy Jr.; its exact origins are debated, but it is generally agreed it originated from Murphy and his team ...
The two-postulate basis for special relativity is the one historically used by Einstein, and it is sometimes the starting point today. As Einstein himself later acknowledged, the derivation of the Lorentz transformation tacitly makes use of some additional assumptions, including spatial homogeneity, isotropy , and memorylessness . [ 3 ]
Through spatial abstraction things in one place are treated as the same as things located elsewhere so that both can form part of the same market. [4]: 281 [34] Valuation is the manifestation of all expressions of worth (aesthetic, practical, ethical, et cetera) through a single exchange value. Monetization is thus foundational to capitalism ...