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# Topic: Special relativity

###### In the News (Tue 15 Jan 19)

 Theory of relativity - Conservapedia Special relativity (SR) is a theory which describes the laws of motion for non-accelerating bodies traveling at a significant fraction of the speed of light. Special Relativity (SR) was initially developed by Henri Poincaré and Hendrik Lorentz, working on problems in electrodynamics and the Michelson-Morley experiment, which had not found any sign of luminiferous aether, which was believed to be the substance which carried electromagnetic waves. Special relativity alters Isaac Newton's laws of motion by assuming that the speed of light will be the same for all observers, despite their relative velocities and the source of the light. www.conservapedia.com /Relativity   (3474 words)

 Einstein, Albert. 1920. Relativity: The Special and General Theory The Principle of Relativity (In the Restricted Sense) The Space-Time Continuum of the Special Theory of Relativity Considered as a Euclidean Continuum The Space-Time Continuum of the General Theory of Relativity Is not a Euclidean Continuum www.bartleby.com /173   (321 words)

 Wikiversity:Special Relativity - Wikibooks, collection of open-content textbooks 8 The Geometry of Space-time in Special Relativity Special relativity is usually concerned with the behaviour of objects and observers which remain at rest or are moving at a constant velocity. Relativity in its Historical Context The discovery of special relativity was inevitable, given the momentous discoveries that preceded it. en.wikibooks.org /wiki/Wikiversity:Special_Relativity   (3233 words)

 Special Relativity -- from Eric Weisstein's World of Physics Special relativity is a theory proposed by Albert Einstein Special relativity is an indispensable tool of modern physics, and its predictions have been experimentally tested time and time again without any discrepancies turning up. While general relativity does indeed describe the relationship between mass and gravitational acceleration, special relativity is perfectly adequate for dealing with relativistic kinematics. scienceworld.wolfram.com /physics/SpecialRelativity.html   (761 words)

 sr Modern Relativity modernrelativity special relativity black hole mass energy Einstein time Schwarzschild light speed   (Site not responding. Last check: ) In special relativity we do not consider gravitation, and it is also not a quantum theory. Thus many of the implications of special relativity that are often quoted as if they were general laws do not hold true in more general physics scenarios. Once special relativity is understood, one may move on to a more general case of physics known as general relativity For those that are ready for this step we have created a section on general relativity -Modern Relativity. www.geocities.com /zcphysicsms/sr.htm   (125 words)

 Relativity The theory of special relativity (or special relativity for short) was established in 1905 by the famous physicist Albert Einstein at the age of 26. Special relativity is of importance in the realm of high relative velocities. Special relativity is now a tool at work, almost daily, in the scientists' calculations and laboratories. nobelprize.org /educational_games/physics/relativity   (118 words)

 The Theory of Special Relativity The special theory of relativity as expounded by Einstein in 1905 is based on the argument that since all attempts to detect motion through the aether fail, the assumption of a "privileged background" is superfluous. I believe Einstein's theories of special relativity and general relativity to be wrong because they describe the universe as having a fourth dimension of time in addition to the three dimensions of length width and height. In relativity, the magnetic field is stationary in the reference frame of an observer who observes it because it is an artefact of their observation. users.powernet.co.uk /bearsoft/SpRel.html   (1683 words)

 SparkNotes: Albert Einstein: Special Relativity According to Galilean relativity, the laws of mechanics are useless to an observer in a non-accelerating reference frame trying to determine whether he or she is moving with respect to another reference frame. However, the fundamental pri nciple of relativity remained the same: the laws of mechanics are the same in all inertial (non-accelerating) reference frames, so it is impossible to determine whether an observer in one frame is moving or stationary with respect to another frame of refe rence. One implication of relativity is the famous "twin paradox," a hypothetical situation in which one twin embarks on a journey through space while the other twin stays on earth. www.sparknotes.com /biography/einstein/section5.rhtml   (1134 words)

 Special Theory of Relativity Relative to Sue, the light bulb is travelling to the left at half the speed of light. Relative to Sue the light bulb, mirror, and detector are moving to left at half the speed of light. Then relative to Sue the unmanned rocket is moving from left to right at 0.40 times the speed of light, which is noticeably larger than the common sense prediction of 0.75 - 0.50 = 0.25 times the speed of light. www.upscale.utoronto.ca /GeneralInterest/Harrison/SpecRel/SpecRel.html   (9266 words)

 Relativity Tutorial Because the speed of light is special, space-time diagrams are often drawn in units of seconds and light-seconds, or years and light-years, so a unit slope [45 degree angle] corresponds to the speed of light. Special relativity was constructed to satisfy Maxwell's equations, which replaced the inverse square law electrostatic force by a set of equations describing the electromagnetic field. Relativity also leads to interesting objects such as fl holes, but these are not very relevant to cosmology. www.astro.ucla.edu /~wright/relatvty.htm   (4051 words)

 Special Relativity What led me more or less directly to the special theory of relativity was the conviction that the electromotive force acting on a body moving in a magnetic field was nothing else than an electric field. This demonstration is useful as a general introduction to relativity in the non-calculus courses and as a motivation for the Lorentz transformation in a higher level special relativity course. It is the relative motion that produces the same physical result in both cases A and B, a certain deviation of the galvanometer. www.physics.ucla.edu /demoweb/demomanual/modern_physics/special_relativity/special_relativity.html   (1012 words)

 - Special Relativity The theory of special relativity is the combination of two ideas and their seemingly weird consequences. Special relativity shows that measurements of distance and time depend on how fast you are travelling - a result that goes against our everyday experiences. But relativity has stood the test of time, and like it or not, the universe really is this strange. www.einsteinyear.org /facts/special_relativity   (969 words)

 special relativity It is the discovery of the actual mathematical errors made in Special Relativity by Einstein, and by Lorentz insofar as he influenced the math of Einstein. Relativity is primarily a theory of measurement, and so what is required is an operational definition of time. It is for the situation in which the man on the train is moving relative to the train and the train is moving relative to the embankment (eye). www.wbabin.net /mathis/spec.htm   (9243 words)

 Theory: Special Relativity (SLAC VVC) Einstein's Special Theory of Relativity describes the motion of particles moving at close to the speed of light. One of the strangest parts of special relativity is the conclusion that two observers who are moving relative to one another, will get different measurements of the length of a particular object or the time that passes between two events. Here we use the same speed, Because the speed of the observer in the lab relative to the tau is just equal to (but in the opposite direction) of the speed of the tau relative to the observer in the lab, so we can use the same speed. www2.slac.stanford.edu /vvc/theory/relativity.html   (2962 words)

 Postulates of Special Relativity This postulate is the nub of special relativity, and much of the content of these pages is concerned with exploring its paradoxical consequences, starting with the next page, The Paradox of Special Relativity. Inertial frames constitute a special class of spacetime coordinate systems; it is with respect to distance and time intervals in these special frames that the speed of light is asserted to be constant. However, general relativity asserts the existence of locally inertial frames, and the speed of light is a universal constant in those frames. casa.colorado.edu /~ajsh/sr/postulate.html   (690 words)

 Acceleration in Special Relativity The only sense in which special relativity is an approximation when there are accelerating bodies is that gravitational effects such as generation of gravitational waves are being ignored. The difference between general and special relativity is that in the general theory all frames of reference including spinning and accelerating frames are treated on an equal footing. The formalism is very similar to that of many general relativity problems but it is still special relativity so long as the space-time is constrained to be flat and Minkowskian. math.ucr.edu /home/baez/physics/Relativity/SR/acceleration.html   (612 words)

 On the Electrodynamics of Moving Bodies The observable phenomenon here depends only on the relative motion of the conductor and the magnet, whereas the customary view draws a sharp distinction between the two cases in which either the one or the other of these bodies is in motion. The following reflexions are based on the principle of relativity and on the principle of the constancy of the velocity of light. In accordance with the principle of relativity the length to be discovered by the operation (a)--we will call it ``the length of the rod in the moving system''--must be equal to the length l of the stationary rod. www.fourmilab.ch /etexts/einstein/specrel/www   (6419 words)

 What's So Special About Relativity? Einstein's first theory of relativity, which he published in 1905, broke away from the Newtonian reliance on space and time as immutable frames of reference. Later to become known as the Special Theory of Relativity, its first postulate was that the speed of light is the same for all observers, regardless of their motion relative to the source of the light. Einstein's 1905 theory is referred to as the "special" theory because it is limited to bodies moving in the absence of a gravitational field. archive.ncsa.uiuc.edu /Cyberia/NumRel/SpecialRel.html   (300 words)

 Understanding Special Relativity   (Site not responding. Last check: ) When we measure distance on an inertial frame that is moving relative to us, the distance in the direction of the relative motion will be less than its proper distance. Relative to the second frame the distance that light passes while moving from one mirror to the other, is more than one light microsecond. After a while they look aside to see where the other person is. They both see that relative to the direction they walk the other is aligned with a point on their path they have already passed, so they both decide that the other is behind them. www.polarhome.com:763 /~rafimoor/english/SRE.htm   (4970 words)

 Lightspeed versus Special Relativity In parallel with this development the theory of Special Relativity was published circa 1905, with main tenets that included the concept that not only local light, but that all of light in space,... This postulate, together with the principle of relativity that all inertial frames are equivalent, forms the basis of Einstein's theory of special relativity. Since there is no relative longitudinal motion between the two planets at this near point in Earth's orbit, the speed of the eclipse light train periods is taken to be 300,000 km/sec, c, in relation to both planets. home.netcom.com /~sbyers11/litespd_vs_sr.htm   (7726 words)

 The Collapse of Special Relativity Many phrases such as "relatively speaking" are well known and generally indicate that all things are equally right; of course this terminology also may indicate the opposite, namely, that all things are equally wrong. The theory of Relativity in its two variants General Relativity and Special Relativity has led to an increase in the belief that the universe is a confused and disordered construct with no absolute principle, except for the constancy of the velocity of light in a vacuum, labeled 'c' in the scientific lexicon. In Einsteins Special Relativity several other physical measurements including space, time, mass and energy become dependent on perspective and in particular the perceived velocity from the different observers. www.relativitycollapse.com   (1028 words)

 Relativity Einstein was far from being the only person who contributed to the development of the theory of special relativity. This theory turned out to be compatible with special relativity, even though special relativity was not known at that time. On November 25, nearly ten years after the foundation of special relativity, Einstein submitted his paper The Field Equations of Gravitation for publication, which gave the correct field equations for the theory of general relativity (or general relativity for short). nobelprize.org /educational_games/physics/relativity/history-1.html   (423 words)

 Special relativity The most amazing article relating to special relativity to be published before 1900 was a paper of Poincaré La mesure du temps which appeared in 1898. The first paper on special relativity, other than by Einstein, was written in 1908 by Planck. The main contributors to special relativity were undoubtedly Lorentz, Poincaré and, of course, the founder of the theory Einstein. www-groups.dcs.st-and.ac.uk /~history/HistTopics/Special_relativity.html   (1823 words)

 Special Relativity Light travels at c relative to the observer, since if the observer sets up an inertial frame (clocks, rulers, etc.) to measure the speed of light he will find it to be c. She is also equipped with a couple of photocells, placed 10 meters apart on the bottom of her spaceship as shown, and she is able to measure the speed of the same blip of light, relative to her frame of reference (the spaceship). That is the unavoidable consequence of the Theory of Relativity. galileo.phys.virginia.edu /classes/252/spec_rel.html   (1702 words)

 Special Relativity Einstein's Theory of Special Relativity, proposed in 1905, teaches us about the motion of objects travelling at near the speed of light. Special Relativity tells us that two observers don't necessarily agree on simultaneity of two events - and they are both "right". It was suggested soon after Special Relativity was introduced and was first intended to show the theory was flawed. science.exeter.edu /ssaltman/relativity/relativity.html   (5071 words)

 special relativity In that sense, this paper is an effort to bolster the theory of Special Relativity, not to tear it down. It is not an attempt to discredit Einstein or Special Relativity. Special Relativity applies to real data, to real observations, and cannot be applied to non-verifiable assumptions or imaginary vectors. geocities.com /mileswmathis/long.html   (9990 words)

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