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Topic: Observer (special relativity)

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The Postulates of Special Relativity Because in special relativity the movement of the observer is equivalent to the movement of the light source, it is generally assumed that the speed of light does not depend, as the postulate of invariability states, on the movement of the observer. In the special theory of relativity, all main conclusions are drawn on the basis of the analysis of the situations with movement of the light source or the observer. Einstein’s postulate of relativity and the postulate of invariability of the light speed are the basis of special relativity. www.wbabin.net /sokolov2/sokolov3.htm   (1201 words)

Counter-Intuitive Consequences of Special Relativity If the source and the observer are moving toward each other, then the frequency of the light increases, which is known as a blue shift because yellow light becomes more bluish. Suppose that one observer sees event A occurring before event B. Then it is possible that another observer who is moving with respect to the first observer to see event A occurring after event B. Copyright ©1999 by Jupiter Scientific Publishing Company Then a person who is moving at a fraction of the speed of light sees a clock recording time more slowly than does a person who is at rest and who is looking at the same clock. www.jupiterscientific.org /sciinfo/cicsr.html   (1201 words)

EINSTEIN'S SPECIAL THEORY and GENERAL THEORY OF RELATIVITY The Relativity conclusion is quote, "Two events that are simultaneous to one observer are not necessarily simultaneous to a second observer, moving relative to the first"...and… "…it is tempting to ask which observer is correct. According to Relativity, even if the Observer had the push button in his hand, with equal lengths of slack wire going to the lights, such that he could stand, or be in motion, closer to one light than the other when he pushed the button, the lights would still not flash simultaneously!! This result of special relativity is called time dilation. ca.geocities.com /rayredbourne/docs/25.htm   (21704 words)

Special relativity Special relativity deals with observers moving at constant velocity; this is a lot easier than general relativity, in which observers can accelerate with respect to each other. Special relativity, developed by Albert Einstein, applies to situations where objects are moving very quickly, at speeds near the speed of light. Similarly, the person on the Earth is moving at 0.95c relative to the observer on the spaceship, so the observer on the ship sees their own clock behaving perfectly and the clock on the Earth moving slow. physics.bu.edu /py106/notes/Relativity.html   (1362 words)

THE SPECIAL THEORY OF RELATIVITY: SIMULTANEITY The second postulate is where all the "mischief" in Special Relativity lies. These are also consequences of the postulates of Special Relativity.) The two postulates of the Special Theory of Relativity are: einstein.byu.edu /~masong/HTMstuff/C9A1.html   (476 words)

The Twins Paradox in Special Relativity - a 'Proper Time' solution. The Twins Paradox is a consequence of the Lorentz transformation equations in the context of Special Relativity, in which an observer considers a moving clock to run slow, and hence a moving observer to appear to age more slowly. Because of this, each of two twin observers in relative motion regards the other as being the one in motion, and each, therefore, expects the other's clock to be running more slowly, and the other to be younger. This also includes the case of an observer moving with zero velocity relative to the travelling twin; that is, it includes the travelling twin himself. home.westserv.net.au /~alen1/Physics/index.htm   (3101 words)

The Physics Classroom One of the peculiar aspects of Einstein's theory of special relativity is that the length of objects moving at relativistic speeds undergo a contraction along the dimension of motion. Specific information on Special Relativity concepts will be available in the future. An observer at rest (relative to the moving object) would observe the moving object to be shorter in length. www.physicsclassroom.com /mmedia/specrel/lc.html   (318 words)

Theory: Special Relativity 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 Einstein's Special Theory of Relativity describes the motion of particles moving at close to the speed of light. This is called the special theory of relativity, since it deals with the relative motions of objects. www2.slac.stanford.edu /vvc/theory/relativity.html   (2915 words)

SPECIAL RELATIVITY The primary concern of special relativity is the determination of the relations between kinematic variables for two different observers. To recapitulate, in special relativity the momentum of a particle of mass m and velocity v is defined as This suggests that the kinetic energy in special relativity should be defined as K = ( www.physics.gatech.edu /people/faculty/gatland/relativity.html   (4072 words)

On the Ontological Status of Minkowski Space The analysis of both the problem of interpretation of the consequences of special relativity and the problem of existence also has a pedagogical value. It helps to overcome a common difficulty in teaching special relativity: the understanding of relativity of space and time and the inseparability of spacetime. The theory of relativity has profound implications for our understanding of reality, existence, the flow of time, free will, etc. This constitutes the greatest challenge, posed by science, that humankind has ever faced. alcor.concordia.ca /~vpetkov/minkowski.html   (4072 words)

The Light Cone: Galileo's Spacetime What Galileo's Principle of Relativity does is that it establishes a sort-of democracy among all inertial observers in the sense that each inertial observer could view the world from the vantage point where he is at rest. The Galilean Principle of Relativity abolished the universality of the notion of "an observer at rest". This is the first formulation of "The Principle of Relativity". www.phy.syr.edu /courses/modules/LIGHTCONE/galilean.html   (4072 words)

Theory: Special Relativity 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 Einstein's Special Theory of Relativity describes the motion of particles moving at close to the speed of light. This is called the special theory of relativity, since it deals with the relative motions of objects. www2.slac.stanford.edu /vvc/theory/relativity.html   (2915 words)

Theory: Special Relativity 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 Einstein's Special Theory of Relativity describes the motion of particles moving at close to the speed of light. This is called the special theory of relativity, since it deals with the relative motions of objects. www2.slac.stanford.edu /vvc/theory/relativity.html   (2915 words)

The Physics Classroom One of the peculiar aspects of Einstein's theory of special relativity is that the length of objects moving at relativistic speeds undergo a contraction along the dimension of motion. Specific information on Special Relativity concepts will be available in the future. An observer at rest (relative to the moving object) would observe the moving object to be shorter in length. www.physicsclassroom.com /mmedia/specrel/lc.html   (2915 words)

THE SPECIAL THEORY OF RELATIVITY: SIMULTANEITY The second postulate is where all the "mischief" in Special Relativity lies. It is here that all of the strange consequences of Special Relativity can be traced. These are also consequences of the postulates of Special Relativity.) einstein.byu.edu /~masong/HTMstuff/C9A1.html   (2915 words)

Spacetime Wrinkles In 1905, Albert Einstein published his famous Special Theory of Relativity and overthrew commonsense assumptions about space and time. Relative to the observer, both are altered near the speed of light: distances appear to stretch; clocks tick more slowly. In-depth coverage of what the NCSA Relativity Group is doing and who it's doing it with archive.ncsa.uiuc.edu /Cyberia/NumRel/NumRelHome.html   (326 words)

Special Relativity relative speed between source and observer may be. Both observers measure the same relative speed, v. A penny has a mass of about 3 g. sol.sci.uop.edu /~jfalward/relativity/relativity.html   (240 words)

Consequences of Special Relativity - Wikipedia, the free encyclopedia Special relativity has several consequences that struck many people as bizarre, among which are: The time lapse between two events is not invariant from observer to another, but is dependent on the relative speeds of the observers' reference frames. Because all motion is relative, if ship A is moving relative to ship B, occupants of ship A see the time of occupants of ship B running slow and occupants of ship B see the time of occupants of ship A running slow. en.wikipedia.org /wiki/Consequences_of_Special_Relativity   (240 words)

NPL Beginners Guides to Measurement - Einstein (Relativity and Time) Einstein's special theory deals with clocks moving with respect to each other and his general theory deals with clocks operating in a gravitational field. A clock in a moving aircraft would be seen to run slow as judged by an observer on the ground. Such is the accuracy with which time can now be measured, modern timekeepers now need to contend with complications arising from the subtle, but real, effects predicted by Einstein's theories of relativity. www.npl.co.uk /publications/einstein/relativity_time.html   (298 words)

Re: Understanding some (to my mind) problems in special relativity. Special relativity is quit difficult to get your head round (it made Einstein's hair stand on end). The whole principle of relativity states that it is actually impossible to tell which observer is staionary and which is moving. Relativity is not quite as simple as some would make out. www.madsci.org /posts/archives/nov2000/975163514.Ph.r.html   (664 words)

The Idea that Shook Physics: On The Consequences of Special Relativity - Science Articles :: Physics Post Before we discuss the consequences of Special Relativity, we have to understand the concept of how an observer located in an inertial reference frame describes an event (an occurrence that can be described by four coordinates [three spatial and one time based]). Special Relativity has its basis in two postulates: (1) All the laws of Physics are consistent in all inertial reference frames and (2) the speed of light in a vacuum (c = 3.00 X 10 The Theory of Relativity has indeed made a remarkable impression on the world of modern physics. www.physicspost.com /articles.php?articleId=102   (664 words)

Physics - Space : Special Relativity and the Understanding of Space and Time Although it is generally overlooked as the consequence of special relativistic effects, the magnetic field around a current-carrying conductor is in fact a strictly relativistic effect arising from the drift of electric charges in the conductor, as viewed by the external observer. A discussion of the relativity of simultaneity can be found in Chapter, IX of Einstein's Relativity: The Special and the General Theory, a Popular Exposition. A gentle illustrated introduction to the basic concepts of special and general relativity, which is aimed nonetheless at first year university students is the course SpaceTime 101, by a lecturer at Cal Tech, USA: http://www.theory.caltech.edu/people/patricia/st101.html. science.uniserve.edu.au /school/curric/stage6/phys/space/relativ.html   (664 words)

Allan Rousselle's House of Cards: Special Relativity in Politics But, because of special relativity, if we observe the exact same event from Spaceship 1, it turns out that the tip of our spaceship passes by the tail of Spaceship 2 a split second *before* the nose of Spaceship 2 passes by our tail. For various reasons -- mostly having to do with some short story ideas I'm kicking around and a general love of science -- I've been reviewing the famous theories of relativity. Special Note: If this is not the entry you were looking for, please click here. www.rousselle.com /allan/archives/000059.html   (664 words)

Science: Physics: Modern: Special Relativity - Open Site The second principle, on which the special theory of relativity rests, is the 'principle of constant velocity of light in vacuo.' This principle asserts that light in vacuo always has a definite velocity of propagation (independent of the state of motion of the observer or of the source of the light). Albert Einstein's Special Relativity (1905) and General Relativity (1915) relate to the Empirical (a posteriori) truth that the laws of nature, and thus the velocity of light, are always measured to be the same for all observers irrespective of their motion relative to one another. Special Relativity is founded on the Lorentz Transformations and the relationship between the motion of matter and its ellipsoidal shape. open-site.org /Science/Physics/Modern/Special_Relativity   (664 words)

Solar System Astronomy, Prof. Gayley: Lecture #24 Relativity introduced an observer-dependent flavor, which was outside the objects themselves. Prior to relativity, the laws of physics appeared to support a philosophy of positivism, which makes absolute statements about the "reality" of every object, and specifies that those objects obey absolute laws. How ironic that physics recovered its self-consistency by invoking postulates that have totally counterintuitive ramifications-- in other words, we discovered something about our universe based not on how we perceive it to be, but rather on what allows us to have the simplest postulates of relativity! www-astro.physics.uiowa.edu /~kgg/teaching/general62/lecture24.html   (635 words)

Physics Today September 2004- Books: Physics and Philosophy Meet Practical Engineering Students often are introduced to the revolutionary nature of time in special relativity via Albert Einstein's famous thought experiment: Suppose that lightning strikes the front and back ends of a train in such a way that an observer on the station platform determines the strikes to occur simultaneously. Surely Einstein's deep conviction that the principle of relativity must be fundamentally embedded in the laws of physics—and his willingness to give up on the ether or anything else that did not accord with that view—was crucial to the discovery of special relativity and cannot be explained as merely a byproduct of a critical opalescence. That insight was key to the discovery of special relativity. www.physicstoday.org /vol-57/iss-9/p57.html   (821 words)

Physics - Space : Special Relativity and the Understanding of Space and Time Although it is generally overlooked as the consequence of special relativistic effects, the magnetic field around a current-carrying conductor is in fact a strictly relativistic effect arising from the drift of electric charges in the conductor, as viewed by the external observer. A discussion of the relativity of simultaneity can be found in Chapter, IX of Einstein's Relativity: The Special and the General Theory, a Popular Exposition. A gentle illustrated introduction to the basic concepts of special and general relativity, which is aimed nonetheless at first year university students is the course SpaceTime 101, by a lecturer at Cal Tech, USA: http://www.theory.caltech.edu/people/patricia/st101.html. science.uniserve.edu.au /school/curric/stage6/phys/space/relativ.html   (1323 words)

Relativity This is one of the predictions of Einstein's general theory of relativity. Note that any two light signals, time T apart, emitted by O will be received by O’ in the interval of kT, and the converse is also true according to the postulates of special relativity. Relative to an observer on earth the muons have a lifetime t/sqrt(1-v physics.berea.edu /~king/Teaching/ModPhys/Relativity/relativity.htm   (1323 words)

PHYS 252 OUTLINE FOR PART IV: SPECIAL RELATIVITY 4) What is the difference between special relativity and general relativity? 5) Give the two postulates of special relativity. What is the relative speed of the two ships as measured by an observer on either of them? www.cbu.edu /~jholmes/P252/PART4.html   (877 words)

Relativity Note that any two light signals, time T apart, emitted by O will be received by O’ in the interval of kT, and the converse is also true according to the postulates of special relativity. This is one of the predictions of Einstein's general theory of relativity. Relative to an observer on earth the muons have a lifetime t/sqrt(1-v physics.berea.edu /~king/Teaching/ModPhys/Relativity/relativity.htm   (2275 words)

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