郑州四中2008-2009学年上期高一年级期中考试

历史试卷    命题人:姜  倩

试卷说明:本试卷分第I卷和第II卷两部分;分值100分  考试时间60分钟

注意事项:

1.答第I卷前,考生务必将自己的姓名、考试号、科目涂写在答题卡上,第Ⅰ卷答在答题卡上,否则不给分。

2.答第Ⅱ卷时,字迹书写要工整、认真,答案直接答在试卷上。

3.考试结束,只交答题卡和第II卷。

第I卷

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郑州四中2008 --2009学年上期高一年级期中考试

化学试卷    命题人  李广印

说明:1  本试卷分为第Ⅰ、Ⅱ卷两部分 请将第Ⅰ卷选择题的答案填入题后答案栏内,

      2   考试时间60分钟,满分100分。

            3   可能用到的原子量Na:23;C:12;O:16;S:32;H:1;Cl:35.5;

第Ⅰ卷

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郑州四中2008??2009学年上期高二年级期中考试

政治试卷    命题人:段华

 

试卷说明:本试卷分Ⅰ、Ⅱ两卷,满分100分,考试时间90分钟。第Ⅰ卷答案请答在答题卡上,答在试卷上无效。交卷时只交第Ⅱ卷和答题卡。

第Ⅰ卷(50分)

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郑州四中2008~2009学年上学期高二年级期中考试

英语试卷        命题人:彭佩霞

注意事项:

1.本试卷分为第一卷和第二卷,共5页,第一卷1-4页,第二卷第5页;考试时间为100分钟;卷面分120分。

2.第一卷的答案用铅笔涂在答题卡上,第二卷用钢笔或圆珠笔写在指定的位置上;不按要求做题不给分。

3.交卷时,只交答题卡和第二卷。

第一卷

Ⅰ 单项填空(共15小题;每小题1分,满分15分)

1. I try to ______ a few minutes every day to do some exercises.

A. set out        B. set off        C. set up        D. set aside

2. The sound of happy laughter ______ memories of his childhood.

A. called for           B. called on          C. called at           D. called up

3. It is the prevention of disease ______its successful treatments that has led to the rapid increase of the world’s population.

A. other than        B. rather than             C. less than               D. but also

4. Being determined is a kind of quality and that’s______ it takes to do anything properly.

A. how                    B. which                      C. where                   D. what

5.The reason ______I have to go is ______my mother is ill in bed.

A. why ;why             B. why; because

C. why ;that             D. that ;because

6. The earth moves around the sun, not______.

A. the other way back                                  B. another way round

C. the other way around                              D. another way against

7. Newton found himself ______the falling apple on his head.

A. inspiring to                                             B. inspired to

C. inspired by                                              D. inspiring by

8. Engines are to machines______ hearts are to animals.

A. that                                                           B. what

C. where                                                        D. which

9. ______we must do is ______the use of energy.

A. That; to reduce                                              B. How; to reduce

C .What;  to reduce                                          D. That; reduce

10. ______ by the beauty of nature, the girl from London decided to spend another two days on the farm.

A. Attracting                                               B. Attracted

C. To be attracted                                           D. Having attracted

11. Many things ______impossible for Chinese to understand in the past are quite common today.

A. considering                                                       B. considered

C. to be considered                                                D .having been considered

12. To know what is good and ______are two different things.

A. doing what is right                                           B. does what is right

C. to do what is right                                        D. did what was right

13. The joke made by Tom made us ______,so the teacher couldn’t make himself______.

A. to laugh; hearing                                             B .laugh; heard

C. laughing; hear                                                 D. laughed; heard

14. Her French upbringing gives her certain advantages ______other students in her class.

A. on          B. up to                       C. over        D. more than

15.―Do you think living in the county has advantages?

            .

A. Yes, perfectly             B. Yes, it is  

C. Nothing at all             D. Well, that depends

II. 完型填空(共20小题,每小题1.5分,满分30分)

If you have strong arms and feet, you might make a good waiter. You must  16 , however, not in the restaurant, but in the  17  , helping the head cook, to learn exactly  18  each dish is prepared. Then you will be able to tell the customers what the ingredients (成分)are and how the food is  19  .From this first step, you may enter the restaurant as a  20 . But you won’t be allowed to serve the customers yet. They will  21  let you do the simplest jobs, such as  22 the tables and carrying the plates. But all the time you must watch and learn. Later you will be taught how to  23  food  and if you are good at it, you may become a waiter in charge of a number of  24  .You may even become a head waiter  25   you are afraid of hard work.

When Carlo Bianchi first arrived in London, he  26  only two English words ― “Please” and “ Hello ”. He  27  to get a job helping in the kitchen of an Indian restaurant, and he spent  28  little spare time he had learning English. He was a good worker and soon he got a job in the restaurant as a waiter. Every night, Carlo used to go home tired, but  29  too tired to study the language for half an hour before going to sleep. He always managed to  30  a third of his wages,  31  he put in the bank regularly every Friday. And no matter how tired or ill he felt, he always had a warm  32  for his customers. The customer liked him,  33  people had been used to coming to the restaurant and asking to be served by Carlo. Now twenty five years later. Carlo is the manager of six restaurants, and he hopes to open a seventh  34  .But he still believes in the personal  35  , and every night he goes to one or another of his restaurants to welcome the customers with a friendly greeting.

16. A. work     B. start     C. cook      D. learn

17. A. market   B. school    C. workshop  D. kitchen

18. A. when     B. how       C. what      D. where

19. A. served   B. eaten     C. cooked    D. bought

20. A. learner  B. waiter    C. cook      D. observer

21. A. soon     B. only      C. later     D. hardly

22. A. laying   B. lying     C. putting   D. moving

23. A. take     B. make      C. carry     D. serve

24. A. tables   B. waiters   C. foods     D. jobs

25. A. if       B. before    C. unless    D. though

26. A. spoke    B. studied   C. heard     D. kept in mind

27. A. failed   B. tried     C. managed   D. intended

28. A. how      B. what      C. such      D. that

29. A. only     B. sometimes C. little    D. never

30. A. spare       B. leave     C. save     D. get

31. A. as          B. leave     C. those    D. which

32. A. friendship  B. dish      C. welcome  D. smile

33. A. and         B. for       C. even     D. therefore

34. A. again       B. late    C. lately   D. more

35. A. opinion     B. touch     C. effort   D. effect

III.阅读理解(共20小题,每小题2分,满分40分)

阅读下列短文,从每题所给的四个选项(A、B、C、D)中选出最佳选项。

A

Some people are lucky enough to be born with a good sense of direction and even if they have only visited a place once, they will be able to find it again years later.

I am one of those unfortunate people who have poor sense of direction and I may have visited a place time after time but I still get lost on my way there. When I was young I was so shy that I never dared ask complete strangers the way and so I used to wander round in circles and hope that by some chance I would get to the spot I was heading for.

I am no longer too shy to ask people for direction, but I often receive replies that puzzle me. Often people do not like to admit that they didn’t know their hometown and will insist on telling you the way, even if they do not know it; others, who are anxious to prove that they know their hometown very well, will give you a long list of directions which you can not possibly hope to remember, and still others do not seem to be able to tell between their left and their right and you find in the end that you are going in the opposite direction to that in which you should be going.

If anyone ever asks me the way to somewhere, I always tell them I am a stranger to the town in order to avoid giving them wrong direction but even this can have embarrassing results.

Once I was on my way to work when I was stopped by a man who asked me if I would direct him the way to the Sunlight Building. I gave my usual reply, but I had not walked on a few steps when I realized that he had asked for directions to my office building. However, at this point, I decide it was too late to turn back and search for him out of the crowd behind me as I was going to meet with someone at the office and I did not want to keep him waiting.

Imagine my embarrassment when my secretary showed in the very man who had asked for directions to my office and his astonishment when he recognized me as the person he had asked.

36.What is the writer going to do when someone asks him for direction?

A. He will direct the right way to the person willingly.

B. He will reply to it by means of being a stranger to the town.

C. He will give the very person long list of direction.

D. He is going to show the man an opposite direction.

37.Why did the writer consider himself to be an unlucky dog?

A. Because of his poor sense of direction.

B. Because he always forget the way to home.

C. Because he did not have any friend.

D. Because he used to be shy and dared not ask others the way.

38.How did the visitor feel when he was showed into the very room?

A. He felt strange.                         B. He felt embarrassed.

C. He felt very sad.                     D. He felt astonished.

39.Who showed the right way to the interviewee according to the passage?

A. Someone we don’t know.

B. The writer did it for himself.

C. The secretary did so.

D. A warm-hearted old lady did such a thing.

B

Suppose you want to buy some new clothes or a new TV. Or maybe you need some work done on your car. How can you find the best price without shopping all over town? Ads can help you. Ads can show you lots of prices. And you don’t have to go anywhere to see them. Just open a newspaper or magazine, and you’ll find plenty of ads.

The following is an ad about TV sets for sale. Please read it and answer the questions below.

40.How many different kinds of TV sets does the store advertise here?

A. Four.                         B. Three.                            C. Two.                    D. Five.

41.Which of the following statements is TRUE according to the advertisement?

A. You can buy any kind on July 14th.

B. The service time is 9 to 9 every day except Monday.

C. The larger the screen is, the higher the price will be.

D. The lowest price is a little more than 300.

42.Which is NOT mentioned in the ad?

A. The date of the American National Day.

B. The post code of the area where the store is.

C. The phone number of the store.

D. The names of the TV sets.

C

Celebrations spread across China when Shanghai, the Oriental Pearl, was given the right to host the 2010 World Expo on December 3.

Shanghai won the honor after beating rivals from Russia, Mexico, Poland and South Korea.

“I’m very proud of being Chinese,”said Wang Kaibo, a Senior 2 student of the Middle School Affiliated to Beijing Medical University.“The winning of the expo is a victory, not only for Shanghai residents, but for the people of the whole Chinese nation.”

Bidding for the expo shows that China is more confident of playing a more important role on the international stage. It’s competing for large events and the next one could be the World Cup, Wang said.

The World Expo 2010 and the 2008 Beijing Olympics will become the twin shining stars of China’s development over the next 10 years, said experts.

The World Expo is known as “Olympics of the economic, cultural, scientific and technological fields.”It is usually held every five years and lasts for six months.

The Olympics, World Cup and World Expo are considered three top international events in the world.

China is the first developing country to win the expo bid in the event’s 151-year history.

Not only will it attract more foreign investment to China, but experts say that the half-year-long exhibition will bring at least 70 million visitors to Shanghai.

The World Expo is a great event for different countries to exchange social, economic, cultural and scientific achievements, and also help to encourage new technology and ideas.

The expo was first held in London in 1851.It has a history of global influence.

The Eiffel Tower, built during the Paris World Expo in 1889,became the symbol of the French  capital.

Many historic inventions, such as the telephone and airplane, all made their first appearance at a World Expo.

43.What does the underlined word “rivals” probably mean in the second paragraph?

A. Competitors.                                        B. Enemies.

C. Players.                                                D. Supporters.

44.The winning of bidding for the World Expo 2010 and the 2008 Olympic Games implies______.

A. China is beginning to play a more important part on the international stage

B. China has played the most important role in the international affairs

C. China has become a developed country ever since 53

D. China is the first Asian country to win the expo bid in history

45.As we know, in general, the World Expo is usually held every ______years, while the Olympics is usually held every ______ years.

A.4;5                     B.5;4                           C.4;4                        D.5;5

46.By bidding for the expo and the Olympics, we are sure that______.

A. China will beat rivals from Russia, Mexico, Poland and South Korea

B. China will become a super country in the United Nations

C. China will build a famous tower like Eiffel Tower as the symbol of the capital

D. China will develop more quickly than before and will benefit a lot from them

D

If you go into the forest with your friends, stay with them. If you don’t, you’ll get lost. If you get lost, this is what you should do. Sit down and stay where you are. Don’t try to find your friends―Let them find you .You can help them find you are staying in one place. There is another way to help your friends or other people to find you. You can shout or whistle(吹口哨)three times. Stop. Then shout or whistle three times again. Any signal(信号)given three times is a call for help.

      Keep up shouting or whistling. Always three times together. When people hear you, they will know that you are not just making a noise for fun. They will let you know that they have heard your signal. They will give you two shouts or two whistles. When a signal is given twice, it is an answer to a call for help.

      If you don’t think that you will get help before night comes, try to make a little house with branches(树枝).Make yourself a bed with leaves and grass.

      When away, Pick off small branches and drop them as walking in order to go back again easily. When you are lost, the most important thing to do is to stay in one place.

47. If you get lost in the forest, you should______.

       A. try to find your friends                     B. stay in one place and give signs

      C. walk around the forest                      D. shout as loudly as possible

48. Which signal is a call for help?

       A. Shouting here and there.                   B. Crying twice. 

      C. Shouting  or  whistling  three  times  together                            D. Whistling everything in the forest

49. When you hear two shouts or two whistles, you know that___.

      A. someone is afraid of an anima             B. people will come to help

      C. someone needs help                          D. something terrible will happen

50. The main idea of the passage is _____________.

       A. how to travel in the forest                

       B. how to spend the night in the forest

       C. what you should do if you want to get some water 

       D. what you should do if you are lost in the forest

E

A new study shows that fat people in the United States suffer direct economic(经济的) and social effects because of their size. The findings are from an 8-year study of about 100 000 people. The people studied were between the ages of 16 and 24 when the research began.

The researchers who carried out the study say they consider the people fat if they are in the top of 5% of the measurement in which weight is connected with height. For example, fat women in the study were about 160 centimeters tall and weighed about 90 kilograms. Fat men in the study were about 175 centimeters tall and weighed 100 kilograms. The researchers say that more than 1 000 000 Americans are that big. The researchers found that fat young women were more likely to lose social and economic power even if they were form wealthy families. The fat women also were 20% less likely to get married and they earned an average of about $6 700 a year less than other women. The study showed less severe effect on fat men. They earned an average of about $3 000 a year less than other men. Fat men also were 11% less likely to get married.

51.From this passage we know fat people in America were______.

A. admired                                          B. respected

C. unhealthy                                                        D. unpopular

52.Which of the following is surely RIGHT?

A. If a woman weighed 90 kilograms, she was considered fat.

B. More than 1 000 000 Americans were about 175 centimeters tall and weighed 100 kilograms.

C. More than 1 000 000 Americans were considered fat by the researchers.

D. In America 20% of women and 11% of men couldn’t get married.

53.Which of the following was NOT mentioned in this passage?

A. The reason why fat people suffered.

B. The cause that caused people to be fat.

C. The standard(标准) of fat people.

D. The number of fat people.

54.The underlined word “severe” means______.

A. economic                                               B. social

C. serious                                                      D. favourable

55.Fat people were inferior to(比……差) other people in______.

A. brains, human rights and payment

B. income, marriage and political rights

C. brains ,education and marriage

D. marriage, getting jobs and income

第Ⅱ卷(共35分)

文本框: 学校___________  班级__________  考号__________  姓名____________文本框: 密  封  线  内  不  准  答  题(共两节,满分35分)

第一节:短文改错(共10小题,每小题1分, 满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断。如无错误,在该行右边横线上划一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

After read your advertisement, I want to offer                 56.___________

myself for the position. I’m twenty years old, male,                    57. ___________

1.78 meters tall, strong and health. And I am going to            58. ___________

graduate Nanjing University this year. I have learned             59. ___________

English for ten years. My spoken English is very much            60. ___________

good and I can write good article. I have won several             61. ___________

prizes in English contests. I have made a great deal of             62. ___________

inventions, most of them have been put into practice.                   63. ___________

But I can use the computer skillfully.                          64. ___________

            If I can get the job, I’ll do all I can do it well.                    65.___________

Thank you for your kindness.   

Yours truly,

                                           Li Hua

第二节:书面表达(共25 分)

根据下列图画用英语写一篇短文,图中男子为Mr. Li

参考词汇:

足球迷  a football fan

•         Mrs. Li 让Mr. Li照看厨房的饭;

•         Mr. Li完全沉迷于球赛;

•         Mrs. Li 回来闻到了糊味;

•         看到饭糊了,Mr. Li 这时才意识到自己的任务。

注意:1.短文应包括图中所提供的主要信息,井做适当发挥,使短文内容连贯、完整;

2.词数: 100左右.

 

 

 

                             

                                             

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

郑州四中高二英语期中考试答案

I 单项选择

  1---5 DDBDC 6―10 CCBCB 11---15 BCBCD

II 完型填空

Ⅲ. 16-20 BDBCA; 21-25 BADAC ;26-30 ACBDC;

31-35 DDACB

IV. 阅读理解

36 -40 BADAD 41-45 CBAAB 46---50 DBCBD

51―55 DCBCD 

V.  短文改错

56. read→reading 57. √  58. health→healthy   59. graduate后加from 60. 去掉much   61. article→articles 62. deal→number  63. them→which 64. But→And 65. 第二个do前加to

VI. 书面表达

Mr. Li is a football fan. One day, his wife wanted to go shopping and asked his husband to keep an eye on the meal being cooked in the kitchen. Mr. Li said, “No problem.” After his wife left, he began to watch TV, a football match. It was very exciting. Mr. Li lost himself in the match at once, forgetting the meal completely. When his wife came home, she felt something smelt terrible. She rushed into the kitchen and found the dish had been burnt black. Only at that moment did Mr. Li realize his task.(93 words)

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2008年武汉市实验学校高一理科实验班12月考试物理试卷

1.如图所示,水平推力使重为的物体静止在竖直墙壁上,若物体与墙间的动摩擦因数为,则物体与墙壁间的摩擦力的大小为

A.                 B.                  C.               D.

2.甲、乙两物体质量之比,速度之比,在相同的阻力作用下逐渐停止,则它们通过的位移

A.1:1            B.1:2            C.2:1            D.4:1

3.利用传感器和计算机可以测量快速变化的力,如图是用这种方法获得弹性绳中拉力随时间变化的关系图线。实验时,把小球举高到绳子的悬点处,然后让其自由下落,根据图线所提供的信息可判定下面说法正确的是

A.时刻小球速度最大

B.时刻绳子最长

C.时刻小球合力最大

D.时刻小球加速度相同

4.如图所示,一质量为的木块与水平面接触,木块上方固定有一根直立的轻弹簧,弹上端系一质量为的小球,小球可在竖直方向上来回运动。在该装置的上方存在着一个无上边界的特殊区域,该区域具有这样的性质:只要小球在该区域里时小球就会受到一个恒定的向上的力的作用。经试验发现:当小球向上运动刚好到达该区域里时弹簧正好为原长,且小球恰好具有最大速度。则当木块对水平面压力恰好为零时,小球的加速度大小是

A.          B.        C.          D.

 

5.在光滑的水平面上有一个物体同时受到两个水平力的作用,在第1s内保持静止状态。若两个力随时间变化的情况如图所示,则下列说法正确的是

A.在第2s内物体做匀加速运动,加速度大小恒定,速度均匀增大

B.在第5s内物体做变加速运动,加速度均匀减小,速度逐渐增大

C.在第3s内物体做变加速运动,加速度均匀减小,速度均匀减小

D.在第6s末,物体的加速度和速度均为零

6.如图所示,A、B两个物体放于光滑水平面上,对A物体施加的拉力,对B物体悬挂重物为的物体,若滑轮摩擦不计,则A、B两个物体的加速度的大小分别为,则下面说法正确的是

A.      B.      C.       D.无法判断

7.如图所示,质量为的物体2放在正沿平直轨道向右行驶的车厢底板上,并用竖直细绳通过光滑定滑轮连接质量为的物体,与物体l相连接的绳与竖直方向成角,则下面说法正确的是

       A.车厢的加速度为  

       B.绳对物体1的拉力为

       C.底板对物体2的支持力为     

       D.物体2所受底板的摩擦力为

 

8.物体A、B、C均静止在同一水平面上,它们的质量分别为mA、mB、mc,得到三个物体的加速度a与其所受拉力F的关系如图所示,图中A、B两直线平行,则下列由图线判断所得的关系式正确的是

   A.µ=µ=µ       

B.mA<mB<mc

C.mA>mB>mC           

D.µAB=µC

9.如图所示,一根轻弹簧的一端系在O点,可自由伸长到B处.今用一小物体m压住弹簧,且将弹簧压缩到A处,然后释放,则小物体能运动到C处静止.物体与水平地面间的动摩擦因数恒定,则下列说法正确的是

A.物体从A到B的速度越来越大,从B到C的速度越来越小

B.物体从A到B的速度越来越小,从B到C加速度不变

C.物体从A到B先加速后减速,从B到C一直做减速运动

D.物体在B点受合力一定为零

10.力单独作用在物体上时产生的加速度为,力单独作用在物体上时产生的加速度为.那么力同时作用在物体上时产生的加速度的范围是

A. 0≤a≤6m/s2                   

B. 4m/s2≤a≤5m/s2

C. 4m/s2≤a≤6m/s2                     

D. 0≤a≤4m/s2

11.如图所示, 将完全相同的两小球用细绳悬于以的速度向右匀速运动的小车顶部,两球分别与小车的前、后壁接触,由于某种原因,小车在的时间内停止,此时悬线的拉力之比为(

A.1:1                 B.1:2            C.1:3            D.1:4

12.如图所示,在光滑的水平面上,质量分别为m1和m2的木块A和B之间用轻弹簧相连,在拉力F作用下,以加速度a做匀加速直线运动.某时刻突然撤去拉力F,此瞬时A和B的加速度分别为a1和a2,则下面结果正确的是

A.a1=a2=0                           

B.a1=a,a2=0

C.a1=,a2=        

D.a1=a,a2=-

 

13.像打点计时器一样,光电计时器也是一种研究物体运动情况的常用计时仪器,其结构如图甲所示,a、b分别是光电门的激光发射和接收装置,当有物体从a、b间通过时,光电计时器就可以显示物体的挡光时间。

图丙

图甲

图乙

  (1)读出滑块的宽度d         cm。

  (2)滑块通过光电门1的速度v1 =      m/s,滑块通过光电门2的速度v2 =       m/s。

  (3)若仅提供一把米尺,已知当地的重力加速度为g,为完成测量,除了研究v1v2和两个光电门之间的距离L外,还需测量的物理量是               (说明各量的物理意义,同时指明代表物理量的字母)。

  (4)用(3)中各量求解动摩擦因数的表达式=                 (用字母表示)。

 

14.如图所示,两个用轻线相连的位于光滑水平面上的物块,质量分别为m1和m2.拉力F1和F2方向相反,与轻线沿同一水平直线,且F1>F2.试求在两个物块运动过程中轻线的拉力T.

 

 

 

 

 

15.如图所示,一质量为M=4kg长为L=3m的木板放在水平地面上.今施一个F=8N的水平力向右拉此木板,木板以v0=2m/s的速度在地上匀速运动.某一时刻把质量为m=1kg的铁块轻轻放在木板的最右端,不计铁块与木板间的摩擦,且把小铁块视为质点,问小铁块经多长时间将离开木板(g取10m/s2)?

 

 

 

 

 

 

16.如图,底座A上装有长O.5m的直立杆,其总质量O.2kg,杆上套有O.O5kg的小环B,与杆有摩擦,当环以4m/s从底座向上运动,刚好能到达杆顶,求

文本框:  (1)B升起过程中,底座对地的压力有多大?

(2)小环B从杆顶落回底座需多长时间?(g=10m/s2)

 

 

 

 

 

17.将小球以初速度竖直上抛,在不计空气阻力的理想状况下,小球将上升到某一最大高度。由于有空气阻力,小球实际上升的最大高度只有该理想高度的80%.设空气阻力大小恒定,求小球落回抛出点时的速度大小.

 

 

 

18.质量为的木块为的速度水平地滑上原来静止的平板小车,小车质量,小车足够长,木块和小车间的动摩擦因数,取,地面与小车间接触是光滑的.求:

(1)木块与小车相对静止时小车和木块的共同速度;

(2)从木块刚滑上小车到它们间刚处于相对静止的过程经历的时间;

(3)从木块刚滑上小车到它们刚处于相对静止时小车对地前进的距离。

 

 

 

 

 

 

 

 

2008年武汉市实验学校高一理科实验班12月考试物理试卷

参  考  答   案

1.B;  2B;  3BD;  4B;  5B;  6B;  7D;  8D;  9C;   10C;    11. C;   12.D;   

13.(1)5.015 ; (2)1.0 , 2.5;(3)P点到桌面高度h ,重锤在桌面上所指的点与Q点的距离a ,斜面的长度b ;(4)

14.  答案:

解析:设两物块一起运动的加速度为a,则有:    ①

    据牛顿第二定律,对质量为m1的物块有:    ②

    由①②两式得:

15.  答案:

解析

联立以上各式,带入数值解得,(舍去)。

 

16. 答案:(1)1.7N;  (2)0.5s

解析:对小环上升过程受力分析,设加速度为a,由牛顿第二运动定律得:Ff+mg=ma   ①             

由运动情况及运动学公式得:  v2=2as   ②

联解①②得: a=16m/s2,   Ff =0.3 N.

对杆和底座整体受力分析得:FN+ Ff =Mg,    ∴ FN=1.7 N.

根据牛顿第三定律,底座对水平面压力大小也为1.7N.

(2)设小环B从杆顶落下的过程中加速度为a2,对其受力分析可得:mg―Ff = ma2

 

由运动学公式 得 :

17. 答案:

解析,,,

,,

联立以上各式解得.

18.答案:

(1);(2); (3).

解析

     

联立以上各式并代入数值解得:

 

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2.考试结束时,只交答题卡和第Ⅱ卷。

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