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Assignment代写:Relativity and classical physics

2017-11-30 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- Relativity and classical physics,供大家参考学习,这篇论文讨论了相对论与经典物理学。自爱因斯坦提出相对论以来,物理学得到了巨大的发展,但是,也对经典物理学带来了巨大的冲击。经典物理学与相对论之间的矛盾是多方面的。如果以经典物理学的视角来分析时间与空间的话,那么时间与空间是绝对的。但是以相对论的视角来看待两者的话,那么时间与空间却是相对的。

classical physics,相对论,assignment代写,paper代写,留学生作业代写

Since Einstein put forward the theory of relativity, physics has been greatly developed, but it has also brought great impact on classical physics. So what is the effect of relativity on classical physics? The paper mainly discusses the advantages and disadvantages of the theory of relativity to classical physics, in order to deepen the understanding of the influence of relativity on classical physics.

In the process of the development of human physics, there are a group of stars shining on our way forward, they are either resolute or unyielding, or with no regrets, or with their indelible enthusiasm to create the human process of unpredictable glory, and in this group of Shining stars, two dazzling superstar always let people cannot ignore their existence. The Shining stars are the beacons of our way forward, and there are two stars that always shine their light, they are Newton and Einstein.

Newton has made invaluable contributions in many fields of classical physics, and he has proposed the mechanics of studying the laws followed by the mechanical motions of macroscopic objects in low-speed situations. What is the important part of classical mechanics? According to the history of classical physics, its important component is Newton's Law of motion, also can be said to be related to Newton's law and its equivalent to other mechanical principles, these principles are also the basic laws of classical mechanics. In addition, his life for the development of physics has also made countless, posterity can not reach the contribution. Newton was the mainstay of the history of classical physics.

Coincidentally, Einstein's role in the advancement of modern scientific development is also a milestone. In the 1905, Einstein proposed the three-epoch theory of ―― light quantum hypothesis, which won the 1921 Nobel Prize, and put forward the statistical explanation of special relativity and Brownian motion. And the result of the confirmatory experiment led to the belief that some of the big scientists who did not believe that the atom was true.

His greatest achievement is three points: from the perspective of the development of physics, this paper puts forward a new system of physical philosophy represented by the theory of relativity, and the controversy between the two theoretical physics schools. He discovered the photoelectric effect equation He has made a contribution to the maintenance of world peace. Einstein, in order to oppose nuclear weapons, also withdrew from the field of nuclear physics.

The theory of relativity has a noticeable effect on classical physics. So what is the theory of relativity? What is it mainly used for? How does relativity affect classical physics? The author thinks that the above problems can be explained from the angle of relativity to the advantages and disadvantages of classical mechanics.

Relativity is the theory of space-time and Gravitation, which was founded mainly by Albert Einstein, which can be divided into special relativity and general relativity according to the different subjects of relativity. The theory of relativity and quantum mechanics bring about revolutionary changes in physics, which together lay the foundation of modern physics. The theory of relativity greatly changed the concept of "common sense" of the universe and nature, and proposed a new concept of "simultaneous relativity", "four-dimensional spacetime" and "curved space-time". However, in recent years, people have a new understanding of the classification of physical theory, ―― the classical and nonclassical physics by its theoretical determinism, i.e. "nonclassical = quantum". In this sense, relativity is still a classical theory.

The relationship between classical physics and relativity is mainly the relationship between any two or many people, it is difficult to exist it or coordination of the seamless situation, most of the elements or members of each other after a long period of time to each other to make a team or a broken relationship can be a long time to maintain a smooth, harmonious way of getting along. Correspondingly, the relationship between relativity and classical physics is not spared, and the contradiction between classical physics and relativity is an important feature that cannot be neglected.

It should be explained that the contradiction between classical physics and relativity is manifold. For example, if you analyze time and space in the perspective of classical physics, time and space are absolute. But the paradox is here, if you look at the two from the perspective of relativity, time and space are relative. In addition, there are a lot of things that classical physics cannot explain, so in this case, the use of relativity is needed to solve the problem, such as when the object is moving at high speed. Thus, the theory of relativity plays an auxiliary role in classical physics, which makes up for the defects in classical physics, and completes the unresolved problems of classical physics. But, in particular, the theory of relativity does not overturn classical physics, as in the case of classical physics, the theory of relativity has more to do with the role of complementary development, the application of classical physics, that is, the vulgar, macroscopic physical world, In a world of high speed onlookers, the areas of classical physics cannot be supplemented and strengthened.

Newton's classical mechanics thought that the quality and energy were independent of each other, and proposed Newton's law, but this law made the special theory of Relativity face great challenge, that is, any object in any space position must be subjected to force. At this time, Einstein proposed general relativity in order to solve the problem.

Einstein's general theory of relativity holds that both the mass and the energy are independent and conserved, and that it is only applicable to the motion of the object far less than the speed of light.

Classical mechanics also has its limitations. In 1543, Copernicus of Poland published The Theory of celestial motion, pointing out the "geocentric", noting that the Earth and other planets revolve around the sun. Classical mechanics unifies the movement of the universe with strict mathematical method and logic system, and realizes the first theory synthesis of human cognition to nature. Classical mechanics also experienced 17, 18, 19th century of further improvement. Both logically and formally are further refined and perfected.

Numerous experimental results show that there is no ether, the speed of light is not affected by the motion of the earth, is a constant. This makes the prediction of classical mechanics fail, and powerfully proves Maxwell's theory of electromagnetism. The seemingly lively academic phenomenon does not solve the actual amount of problems, but rather makes physics into chaos. As we all know, special relativity is very similar to classical mechanics, both of which are the applicable theory of object motion in low-speed condition, and in the case of high speed, the deficiency of classical mechanics is embodied, and he no longer applies to special relativity, and the second is the principle of the constant speed of light. In any inertial system, the speed of light is C, which leads to the relative nature of the simultaneous. Since the speed of light is limited, the light travels from A to B for a certain period of time, so there are two simultaneous events in a reference system, which is no longer the same in another reference system. Each reference department has its own time, which changes the concept of time in people's minds for thousands of years. Relativity and classical mechanics are different and related. Concrete can be summed up in this way: classical mechanics is the special theory of relativity at low speed. Throughout the history of human science, any kind of theory, as long as it can conform to the strict logic, and can reasonably explain the experimental phenomena discovered, but also can successfully predict the phenomenon has not been discovered and finally confirmed by the experiment. Then the theory cannot be completely wrong. But it could never be perfect. Because it is always the approximate form of the objective law of nature in certain conditions and the specific scope of application. As a result, nature can be recognized, but understanding is never-ending.

It can be seen that the effect of relativity on classical physics is not, but on the one hand, the pros and cons of classical physics, the author seems that both are the product of scientific development, the two complement each other, for the development of human science is indispensable.

From different research directions, the research fields involved are different, the theoretical knowledge needed is different, and the results obtained are not the same. Different research methods make the research process not the same. The research method makes the research process more effective and the wrong research method makes the research process drag on. Similarly, the correctness of the chosen theoretical knowledge is decisive for the results of the study. As mentioned above, Relativity is a supplement and extension to classical physics in a field of study. For example, in the field of macro-low-speed research, classical physics can solve all kinds of problems in reality or ideal, but in the field of micro-high-speed research, the shortage of classical physics has been shown without reservation. At this time, the role of relativity in the complementarity and expansion of classical physics has emerged. From this we can conclude that relativity is not the overthrow and substitution of classical physics, but the supplement and expansion of classical physics. The theory of relativity has made classical physics fully aware of its shortcomings and has made the right improvements and refinements to classical physics. Thus, the effect of relativity on classical physics is like a double-edged sword, at some point of view, Relativity makes the theoretical knowledge of classical physics no longer used in human studies, and from another point of view to the relationship between the two, the theory of relativity has played a certain role in the development and progress of classical physics.

Therefore, we should look at the relationship between the two correctly and dialectically, so that we can make a wise choice.

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