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English | 70mins | 688x288 | 25fps | XviD | MP3 - 131kbs | 450MB
Genre: Documentary
The theory of relativity, or simply relativity, generally refers specifically to two theories of Albert Einstein: special relativity and general relativity. However, the word “relativity” is sometimes used in reference to Galilean invariance.
The term “theory of relativity” was coined by Max Planck in 1908 to emphasize how special relativity (and later, general relativity) uses the principle of relativity.
Special relativity is a theory of the structure of spacetime. It was introduced in Albert Einstein’s 1905 paper “On the Electrodynamics of Moving Bodies”, however the term was first used by Galileo Galilei in 1632 in his Dialogue concerning the World’s Two Chief Systems. But Galileo’s version was flawed: for example, he thought the spin of the Earth caused the tides[1]. Special relativity is based on two postulates which are contradictory in classical mechanics:
The laws of physics are the same for all observers in uniform motion relative to one another (Galileo’s principle of relativity),
The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the source of the light.
The resultant theory has many surprising consequences. Some of these are:
Relativity of simultaneity: Two events, simultaneous for some observer, may not be simultaneous for another observer if the observers are in relative motion.
Time dilation: Moving clocks are measured to tick more slowly than an observer’s “stationary” clock.
Length contraction: Objects are measured to be shortened in the direction that they are moving with respect to the observer.
Mass-energy equivalence: E = mc2, energy and mass are equivalent and transmutable.
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