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Physics in EnglishThe scientist does not study nature because it is useful;he studies it because he delights in it,and he delights in it because it is beautiful.If nature were not beautiful,it would not be worth knowing,and if nature were not worth knowing,life would not be worth living."------ Henri PoincareDepartment of PhysicsSchool of scienceXian Technological University 2012.9Chapter 1 What is Physics?Physics is natural science studying nature's LawsPhysics was called natural philosophy and fundamental science.The history of physicsThe history of physics encompasses two broad time periods in which classical physics and modern physics developed. Classical physics developed between 1600 and 1900. It embraces the general areas of physics known as mechanics, thermodynamics, and electromagnetism, culminating in relativity. Modern physics began developing between about 1890 and 1930, when it was realized that classical physics could not account for the newly discovered behavior of nature at the atomic and molecular level. Modern physics includes the theory of relativity as well as quantum mechanics and most of the subsequent new physics discovered and developed during the 20th century.Classical physicsClassical physics includes the traditional branches and topics that were recognized and well-developed before the beginning of the 20th century—classical mechanics, optics, thermodynamics, and electromagnetism. Classical mechanics is concerned with bodies acted on by forces and bodies in motion and may be divided into statics (study of the forces on a body or bodies at rest), kinematics (study of motion without regard to its causes), and dynamics (study of motion and the forces that affect it); Acoustics, the study of sound, is often considered a branch of mechanics because sound is due to the motions of the particles of air or other medium through which sound waves can travel and thus can be explained in terms of the laws of mechanics. Among the important modern branches of acoustics is ultrasonics, the study of sound waves of very high frequency beyond the range of human hearing. Optics, the study of light, is concerned not only with visible light but also with infrared and ultraviolet radiation, which exhibit all of the phenomena of visible light except visibility, e.g., reflection, refraction, interference, diffraction, dispersion, and polarization of light. Heat is a form of energy, the internal energy possessed by the particles of which a substance is composed; thermodynamics deals with the relationships between heat and other forms of energy. Electricity and magnetism have been studied as a single branch of physics since the intimate connection between them was discovered in the early 19th century; an electric current gives rise to a magnetic field and a changing magnetic field induces an electric current. Electrostatics deals with electric charges at rest, electrodynamics with moving charges, and magnetostatics with magnetic poles at restThe Emergence of Classical PhysicsClassical mechanics has its roots in the work of Johannes Kepler, who, between 1600 and 1619, became the first person to describe quantitatively and accurately the elliptic paths of the planets around the Sun.The problem of the shape of the planetary orbits was not easy to solve, because all historical observations of the planets were made from the Earth, itself a moving planet. Although a crude heliocentric(Sun-centered) model of the solar system using circular orbits was proposed by the Greek astronomer Aristarchus in the third century B.C. and resurrected by Copernicus in 1542,the planetary positions predicted by Copernicus were not as accurate as those found using Ptolemy's complicated geocentric (Earth-centered} model of the second century A.D.The pure Copernican model was inaccurate because Copernicus refused to abandon the flawed concept of early Greek thought that the natural path of a moving "perfect" celestial object, such as a planet, had to be in the shape of the "perfect" geometrical figure---a circle---with the planet moving at constant speed. a scientist living at the time of Copernicus would have been forced to reject the Copernican theory with its circular planetary orbits, since they did not account for the observed motions of the planets as accurately as the existing, but more complicated, geocentric theory of Ptolemy.The change from the accurate but complex Ptolemaic geocentric model of the solar system to the accurate and simple heliocentric model of Kepler illustrates the characteristics of a good theory. With Kepler's work, accuracy and simplicity blossomed simultaneously from the heliocentric hypothesis. Kepler's model and mathematical methods began the development of physics as we know it. His work was a watershed of quantitative thought and a new worldview.Observation of nature and experimental results typically precede the general theories that account for them. The extensive observations of the planets by Tycho Brahe just prior to 1600 provided Kepler with the data he needed to model the solar system accurately and precisely。
物理学专业英语基础期末题库Grammar: Choose the best answer （每小题2分）1 . Ice-cream in this restaurant. [单选题] *A. is servingis served(正确答案)C. servesD. served2. Mr. James ________ in China for ten years. Now he has got a job in Australia. [单选题] *A. workedB. has worked(正确答案)C. is workingD. has been working3. ---When will you come to see me, Dad?---I will come to see you when you ____ the training course. [单选题] *A. will have finishedB. will finishC. are finishingD. finish(正确答案)4. He told me that the final examination _______ next Thursday. [单选题] *A. is givenB. will be givenC. would have givenD. would be given(正确答案)5. The little girl _____ her heart out because she _____ her toy bear and believed she wasn’t ever going to find it. [单选题] *A. had cried; lostB. cried; had lost(正确答案)C. has cried; has lostD. cries; has lost6. Water ______ into ice. [单选题] *A. will changedB. must be changedC. should changeD. can be changed(正确答案)7. She had learned English for eight years by the time he from university last year. [单选题] *A. will graduateB. will have graduatedC. graduated(正确答案)D. is t graduate8. The new play _______ in theatre now .Why don’t you go in and see it [单选题] *A. is being shown(正确答案)B. is showingC. is shownD. show9. Can you tell _______ [单选题] *A. when did it happenB. when was it happenedC. when it happened(正确答案)D. when it was happened10. He has been working on the composition the whole morning and he still _____. [单选题] *A. has beenB. doesC. hasD. is(正确答案)11.The price _____, but I doubt whether it will remain so low. [单选题] *A. went downB. will go downC. has gone down(正确答案)D. was going down12.You can’t move in right now. The house _____. [单选题] *A. has paintedB. is paintedC. is being painted(正确答案)D. is painting13. – Is this raincoat yours?– No, mine _____ there behind the door. [单选题] *A. is hanging(正确答案)B. has hungC. was hangingD. hang14. We would like to go and thank him ourselves, but we _____ out his address yet. [单选题] *A. haven’t found(正确答案)B. hadn’t foundC. didn’t findD. don’t find15. Shirley _____ a book about China last year but I don’t know whether she has finished it. [单选题] *A. has writtenB. wroteC. had writtenD. was writing(正确答案)16. Do I have to take this medicine? It ____ terrible. [单选题] *A. tastes(正确答案)B. is tastingC. is tastedD. has tasted17. I must return the camera to Li Lei. I _______ it for two weeks. [单选题] *A. keepB. borrowedC. have kept(正确答案)D. have lent18. ______ the job ______ by Lucy or by John? Tell me the truth ,please. [单选题] *A. Has…finishedB. Has …being finishedC.Is …finishD. Has …been finished(正确答案)19. Isn’t this the third time that you _____ late? [单选题] *A. have been(正确答案)B. will beC. wereD. had been20. By this time tomorrow, we _____ the machine. [单选题] *A. have repairedB. will have repaired(正确答案)C. will repairD. would repair21. Have you discovered who __________your book by mistake? [单选题] *A. takesB. took(正确答案)C. takenD. will take22. It _________in the newspaper that a new railway will go through East Forest. [单选题] *A saysB. is said(正确答案)C. saidD. is saying23. We asked our teacher when we __________ for our study trip to New York. [单选题] *A. set outB. have set outC. will set outD. would set out(正确答案)24. The teacher told the students that the sun _________ eight planets. [单选题] *A. has(正确答案)B. haveC. hadD. had had25. If it __________rain tomorrow, we will go to the Botanic Garden to enjoy the beautiful flowers. [单选题] *A isB. willC. isn'tD. doesn't(正确答案)26. The hotel________ a lot of complaints because of the terrible service since last year. [单选题] *A. are receivingB. have receivedC. has received(正确答案)D. received27. I __________the streets in our neighborhood this time yesterday when you called me. [单选题] *A. was cleaning(正确答案)B. have cleanedC. am cleaningD. would clean28. ---You look very nice in your new dress today.---Thank you. I________ it when it was on sale. [单选题] *A. buyB. bought(正确答案)C. have boughtD. will buy29. At the meeting the boss was explaining his plan while his secretary___________ the notes. [单选题] *A. is takingB. was taking(正确答案)C. has takenD. takes30. There is someone who _________to see you. [单选题] *A. wantB. wants(正确答案)C. wantedD. will want31. I’ve something ________ you. [单选题] *A. tellB. toldC. to tell(正确答案)D. telling32. When I was young, my father used to ____me some interesting stories. [单选题] *A. sayingB. tell(正确答案)C. tellingD. speak33. Mrs Zhang told me that a rabbit’s large ears enable it ____ the slightest sound. [单选题] *A. hearB. hearingC. heardD. to hear(正确答案)34. Tom has worked for the whole day there. I think he is too tired to go on ____. [单选题] *A. workB. working(正确答案)C. workedD. to work35. Don’t be worried about me, Mom. As soon as I ____ in America, I will call you. [单选题] *A. arrive(正确答案)B. arrivesC. arrivedD. is arriving36. --- Can you tell me if Sandy ____ to have dinner with us?--- I think she will come if she ____ free tonight. [单选题] *A. come; will beB. come; isC. will come; is(正确答案)D. comes; is37. _______ you just have a look at the programme "I'm the chef today" on ICS, you______ able to change the channel. [单选题] *A. If; shouldn't beB. After; must beC. When; would beD. If; won't be(正确答案)38. The cat___________ to the people who live upstairs. [单选题] *A. belongB. belongs(正确答案)C. is belongingD. was belonging39. The game "Travel in space" sounds _______ and we are all _______ in it. [单选题] *A. interested; interestingB. interested; interestedC. interesting; interested(正确答案)D. Interesting; interesting40. We can protect our country by _________ the air, the water and the land. [单选题] *A. not polluting(正确答案)B. not polluteC. not to polluteD. to not pollute41. Wait a moment! He __________ a meeting in the meeting room. [单选题] *A. will haveB. hasC. is having(正确答案)D. had42. If the trees keep on _______ , it can be _________to block the sun out and cool the air. [单选题] *A. growing; tall and large enough(正确答案)B. grow; enough tall and largeC. living; tall and large enoughD. live; enough tall and large43. The government warned some factories _____ the water again, or they will be punished. [单选题] *A. polluteB. to polluteC. not polluteD. not to pollute(正确答案)44. George jumped out of bed quickly this morning when the alarm clock suddenly ____. [单选题] *A. went off(正确答案)B. went toC. went outD. went on45. ____! There are so many cars on the street. Don’t cross the street now. [单选题] *A. Look out(正确答案)B. Look afterC. Look upD. Look at45. I won’t go to Tom's birthday party tomorrow evening unless_______. [单选题] *A. invitingB. being invitedC. invited(正确答案)D. having invited47. He pretended _______with Mary when I saw him. [单选题] *A. I was talkingB. talkingC. to talkD. to be talking(正确答案)48. The captain, as well as his passengers ___________ alive when they were rescued from the sinking ship. [单选题] *A. was(正确答案)B. wereC. isD. are49. Bill got lots of help from others though he ____ the biggest trouble in life last year. [单选题] *A. met with(正确答案)B. meeted withC. had met withD. was meeting50. _______the early train, Tom got up very early this morning and rushed in a taxi to the railway station. [单选题] *A. CatchingB. CaughtC. To catch(正确答案)D. Catch。
1、vectors矢量：velocity（速度v）acceleration（加速度a）force（力f）displacement（位移）,Vectors(向量)2、scalars标量：speed（速率）weight（重量）mass（质量）volume（体积）energy（能量）work（功）3、The unit of SI(国际标准单位)：metre米,kilogram千克KG,second秒S,newton牛顿N,watt瓦特W,ampere安培A,joule焦耳J4、连线：length长度----metre(M米)，mass质量----kilogram(KG千克)，time时间----second(S秒)，current电流----ampere(A安培)，temperature温度----kelvin(K开尔文)，amount物质的量----mole(MOL摩尔)，charge电荷----coulomb(C库伦)，force力----neton(N牛顿)，energy能量----joule（J焦耳），resistance电阻----ohm（Ω欧姆）5、(√×)Average velocity is not necessarily the same as average speed.平均速度不等于平均速率。
6、概念Displacement位移is distance moved in a particular direction. metre (m).7、用点，他们的组合效果被称为合力。
8、The turning effect of a force is called a moment（力矩）9、On earth, everything feels the downward force of gravity。
This gravitational force is called weight.（重力）10、Near the Ether’s surface, the gravitational force on each kg is about 10 N:the gravitational field strength重力场强度is 10 N kg-1. This is represented by the symbol g.（g的概念）11、Work功is done whenever a force makes something move.12、Things have energy能if they can do work。
姓名：杨清军 学号：09027217 我们已经算出u F 的值是力除以长度；因此，的结果是力。
根据公式（8.7）[F]=22][Lq ; [I]=T q ][ 使用公式（9.4）的结果，我们发现[k]=22LT 所以，在单位制中，k 可以写成公式K=21c (9.5) 式中c 为速率，把k 称之为电磁常数。
为了找到它的大小，我们使用在库伦定律和国际单位制中已制定的实验上的价值。
一个2107-⨯N/m 大小的力和3⨯104-dyn/cm 是相等的。
根据公式（9.1），当b=100cm 的时候，这是一个带有 单位交流电的力。
因此2⨯104-=1001031032299⨯⨯⨯⨯⨯c 由此C=3⨯1010cm/s=3⨯108m/s (9.6) 电磁波的理论值和在真空中的光速相等。
在麦克斯韦理论中，存在一个与在真空中电磁波速 率大小相等电磁常数c 。
同时根据真空中的光素为c 使麦克斯韦猜测光也是一种电磁波。
在公式（9.1）中的k 值在电磁单位制中是1和 1/c 2=1/(3⨯1010)2s 2/cm 2。
因此接下来的是1cgsm 的电流等于I cgse 10103⨯的电流A cgse cgsm I 10103110=⨯= (9.7) 用1s 乘以这个公式，我们会得到C cgse cgsm q q 10103110=⨯= (9.8) 因此cgse c cgsm I I 1= (9.9)相应的cgse cgsm q cq 1= (9.10) 存在一个关于常数0ε,0μ和c 的确定的公式，让我们找到结果 的大小和方向。
根据公式（8.11），00με 的值是[][][]F L q 220=ε (9.11) 根据公式（9.2）[][][][][]2220q T F I b F u ==μ (9.12) 公式（9.11）和公式（9.12）可以得到[]222001νμε==L T (9.13) （v 是速度）联立公式（8.12）和（9.3），可得结果 00με的数值是()222287900103110410941m s m ⨯=⨯⨯⨯⨯=-ππεμ (9.14) 最后我们联立公式（9.6），（9.13）和（9.14），我们可以得到一个令我们感到兴趣的关系 2001c =με (9.15) 9.2 磁场 电流贯穿其中与之相互作用的场叫做磁场。
