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Search Results: 1 - 10 of 23 matches for " Simultaneity "
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O problema da simultaneidade na lei do impedimento do futebol
Delfim, T.F.;Jesus, V.L.B. de;
Revista Brasileira de Ensino de Física , 2011, DOI: 10.1590/S1806-11172011000400008
Abstract: based on fifa's rule (from franch: federation internationale de football association), to consider a player in off-side position it is necessary the simultaneous observation of both the position of the player and the ball at the moment of the launch in any position of the ball and the payer in the football field, except in the case of a direct reception of the ball from the goal kick, or lateral reposition of the ball, or corner. the aim of this work is to show that it is not possible to mark correctly the off-side in all cases. this impossibility is due to the fact that the referee responsible to mark the off-side does not have a vision field correspondent to 180 degrees, but approximately 30 to 40 degrees that allows detecting simultaneous events, as discussed in section 2. based on this discussion one estimates the characteristic time spends by the referee to turn the head approximately 90 degrees to try to observe simultaneous events out of his vision field. using these intervals of time it was possible to estimate typical distances beyond the off-side line, when in legal position at the moment of the launch.
Teoria fenomenológica do processo de relaxa??o dielétrica
Robert, Renê;
Revista Brasileira de Ensino de Física , 2004, DOI: 10.1590/S0102-47442004000300008
Abstract: the goal of this work is to introduce the concept of non simultaneity between cause-effect, which is not very common in several problems of physics and biology, showing how to treat these problems and verifying the results. for this study we will use the dielectrics. pellat-debye's theory for dielectric relaxation is modified introducing a delay in the response ( polarization ) to the action (electric field), so as the validity of the causality principle is satisfied.
Critical Comments on the Paper “On the Logical Inconsistency of the Special Theory of Relativity”  [PDF]
Vladimir A. Leus
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.64079
Abstract: Special Relativity Theory is more than 110 years aged and during this period it was elaborated until minuscule details. However, there might be some logically deduced discrepancies, which demand a scrupulous study. Nonetheless, every search for inherent contradictions is an uphill task. The author of the considered paper proposed a situation with two series of synchronized clocks. Each series is at rest in its own frame of reference, but one of them is deemed to be stationary and other is moving with a constant relative velocity. The author believes this situation to be contradictable. But really, the suitable mathematical analysis proves that it is none other than a consequence of neglecting the basic tenets of the theory.
A Transnational Gaze
Levitt, Peggy;
Migraciones internacionales , 2011,
Abstract: in the decade since this journal was founded, major demographic shifts caused shifts in migration studies. against this backdrop, the questions migration scholars ask and the analytical and methodological tools we use to answer them have changed dramatically. in this essay, i take an idiosyncratic look at these developments and propose directions for the future. i focus on the analytical rewards of using a transnational perspective to study migration, on the importance of considering space and scale in our work, and on bringing culture more centrally back into our conversations. i highlight opportunities at interdisciplinary intersections that, can move our field forward in new productive directions if we take advantage of them.
La contracción de Lorentz en relatividad especial
C. Zagoya,,M. Fernández Guasti
Latin-American Journal of Physics Education , 2009,
Abstract: The Lorentz length contraction for a rod in uniform motion is derived performing two measurements at arbitrary times.This alternative derivation, in contrast with the one found in most textbooks, does not invoke the simultaneousmeasurement of two events. It thus avoids uncomfortable superluminal relationships. An example of a spacecontraction measurement from the same rest position in the observer frame illustrates the procedure.
The Quaternion Structure of Space-Time and Arrow of Time  [PDF]
Ying-Qiu Gu
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.37078
Abstract: In fundamental theories of physics, the dynamical equations all have time inversion invariance. Except for the evolution of some simple system which has realistic inverse processes, but for a slightly more complicated system, the evolution processes are irreversible. This is the problem of arrow of time, which is always warmly debated. In different point of view, we find there may have some conceptual misunderstanding in the controversy: 1) The realization of an inverse process does not mean the time of the system goes backward. 2) The principles of relativity and covariance are the constraints to physical laws, but not constraints to specific solutions. The equations must be covariant, but the solutions are not definitely symmetric. 3) Time is a global property of the universe, which is a measurement of the evolution process of the universe. The internal time of a matter system reflecting its internal evolution speed also takes this cosmic time as a unified background and standard of measurement. 4) The universe has a unified cosmic time T and a cosmic space related to this cosmic time. They are objective and absolute. 5) The eigensolution of a spinor is a critical state losing time concept, which responses the interaction of environment with some uncertainty, then the evolution process of the world is not uniquely determined. 6) The non-uniqueness of the evolution process means that the inverse process is absent. So for a world including spinors, the evolution is essentially irreversible. In this paper, according to the widely accepted principles and direct calculations of transformation, we reveal the misunderstandings in the usual controversy, and then give more natural and reasonable explanations for structure of space-time and arrow of time.
Presence of the Gift
Ann Game,Andrew Metcalfe
Cultural Studies Review , 2010,
Abstract: Philosophers, social theorists and cultural theorists have generally followed Mauss in assuming that gifts entail obligatory exchanges between distinct parties who give, receive and reciprocate, and, that the social emerges through this sequence of obligations. It is the obligation to reciprocate, for example, that led Derrida to claim that the gift is impossible. We consider the alternative ideas that non-exchange gifts are not only possible but the basis of social life: that the social arises from the nonsequential giving-and-receiving of a gift relation. To develop this claim, we draw on a research project on the phenomenology of teaching. While many interviewees, teachers and students, spoke of the gift in exchange terms, many also spoke of classroom experiences in which there is a giving and receiving that is neither sequential nor locatable. Through the resonances of the concept of presence, we draw out the time, space and ontology of the gift.
Presence of the gift
Game, Ann,Metcalfe, Andrew
Cultural Studies Review , 2010,
Abstract: Philosophers, social theorists and cultural theorists have generally followed Mauss in assuming that gifts entail obligatory exchanges between distinct parties who give, receive and reciprocate, and, that the social emerges through this sequence of obligations. It is the obligation to reciprocate, for example, that led Derrida to claim that the gift is impossible. We consider the alternative ideas that non-exchange gifts are not only possible but the basis of social life: that the social arises from the nonsequential giving-and-receiving of a gift relation. To develop this claim, we draw on a research project on the phenomenology of teaching. While many interviewees, teachers and students, spoke of the gift in exchange terms, many also spoke of classroom experiences in which there is a giving and receiving that is neither sequential nor locatable. Through the resonances of the concept of presence, we draw out the time, space and ontology of the gift.
A concep o bergsoniana do tempo
Frederic Worms
DoisPontos , 2004,
Abstract: The aim of this article is to show how Bergson′s philosophy derives from the understanding of the passing of time as an original and primordial fact. In this way, his works can be considered to be different attempts to explain this experience of temporality which, philosophically considered, consist of the intuition of duration. Thus, we examine the way in which the treatment given to distinct philosophical problems discussed in each of his works takes place as a meditation on the primitive fact and its progressive clarification. Firstly, we follow the course of deduction of the main characteristics of duration, succession, conservation and act, emphasizing some of his philosophical consequences. We then examine the critical dimension of Bergson′s philosophy through the analysis of the thought of the instant, which distorts the experience of time and gives rise to an equivocal way of traditional metaphysics; in this examination we shall seek to differentiate this idea from the experience of simultaneity that constitutes our concrete relationship with things.
The Twins Clock Paradox History and Perspectives  [PDF]
Robert L. Shuler Jr.
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.512108
Abstract:

The twins or clock paradox has been a subject of lively discussion and occasional disagreement among both relativists and the public for over 100 years, and continues to attract physicists who write papers giving new analyses or defending old ones, even though many physicists now consider the matter only of educational interest. This paper investigates the number of papers, which is increasing, and trends in explanations, some of which are now targeted at professional physicists and other of which are targeted at optical or radar visualization rather than problem solving. Observations of students indicate that the latest techniques help but only somewhat. An analysis is made of 21 previous treatments appearing in the education related American Journal of Physics, Einstein’s discussions and several other pedagogical papers. A new memory aid for simultaneity transformation is given that puts it on a par with “time dilation” and “length contraction” for quick and easy problem visualization. The point of view of a trailing twin is introduced to show how simultaneity changes account for missing time in the turnaround. Length contraction is treated on equal footing with time dilation, and Swann’s insight into clocks is extended to lengths. Treatments using the conventionality of simultaneity are seen as equivalent to choice of co-moving frames. Responses to difficult questions are suggested which avoid being dismissive, and engage students’ critical thinking.

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