第一篇：初三尖子生會議內(nèi)容2009

初三尖子生會議內(nèi)容

2009.10.161、對同學(xué)們進入年級前60名表示祝賀

進入年級前60名的同學(xué)既有暑假升級考試中居前60名的同學(xué)，也有后來居上新闖進前60名的同學(xué)，這充分說明只要我們努力一切皆有可能。希望同學(xué)們戒驕戒躁繼續(xù)保持前進的動力，以不敗的戰(zhàn)績續(xù)寫人生的輝煌。

2、公布各班進入年級前60名的人數(shù)

07---1共 10 人、07---2 共11人、07----3共 9人、07----4共7人、07—5 共12 人、07—6共11人

各班進入前60名的人數(shù)不盡相同，而且有不小的差距，成績好的班級的同學(xué)不要驕傲你們班的成績好有你的一份功勞，但并不代表你的成績就好了，如果你們稍不努力，那么你、你們班的成績就會被其他班級超越，所以你們不能有半點的馬虎；成績不好的班級的同學(xué)也不要氣餒，相信你們班只是暫時的落后，我們更相信通過你們的努力通過你們在班級的帶動，你么的班級一定會取得優(yōu)異的成績。

3、鼓勵同學(xué)們做好一中提前批招生的準備

一中在中考之前有一次選拔考試，通過考試選出進入全縣前160名的同學(xué)提前進入一中學(xué)習(xí)，組成一中的特尖班，這兩個班的老師的配備是一中最優(yōu)秀的老師，而且每年考取清華、北大的學(xué)生都出自這兩個班，雄厚的師資力量，良好的學(xué)習(xí)環(huán)境，將會是我們成功路上必不可少的條件。今天我們在場的每一位同學(xué)絕對有這個實力或能力來沖刺第一批考試，能夠考取一中提前批是一中榮譽，而且這種榮譽是用金錢都買不來的，另外也能給父母減輕經(jīng)濟負擔(dān)，第一學(xué)期的學(xué)費不要了，這無形中就是給父母掙了第一筆錢，再有就是向自己的最高理想邁出了最堅實的一步，最后就是可以向你的小學(xué)同學(xué)(轉(zhuǎn)學(xué)的)證明我在梁村中學(xué)上少花了錢，一樣實現(xiàn)的人生的第一個目標，我比你們更出色。

4、要求同學(xué)們

一要注意我們每次考試的名次，二要注意我們每次考試的分數(shù)，注重名次是為了檢查我們自己在這個群體中我們到底處于一個什么位置，注重分數(shù)是為了看我們應(yīng)該掌握的知識到底達到了一個什么水平，還有哪些知識我們沒有掌握到位。有些時候我們用不著與別人比一看自己做的試卷我們就知道自己不行，這種時候即使在學(xué)校得第一，我們也是沖不到全縣前面去的。

第二篇：初三尖子生輔導(dǎo)一

第8周優(yōu)生輔導(dǎo)

（本卷共100分，請把答案填在答題卡上）

一、聽取信息:共25分

（一）(五)1二、完形填空：共10分（深圳中考）

Do you like going to a zoo to see ____21___? How about ____22___ a zoo and feeding the animals yourself? It’s not a joke.It happened both in a film and in the ____23___.Benjamin Mee is a newspaper writer in Los Angeles, the US.His wife dies and he has to ____24___ his two young kids.Hoping for a fresh start for his family, Mee ____25____ his job and buys an old house on 73000 square meters ____26___ the city.The land comes with a special gift: a zoo in the country called the Rosemoor Animal Park!The zoo was ____27___ because of the economy crisis(經(jīng)濟危機).With ____28___ raising them, about 200 animals are still living there.The Mee family decide to help reopen the zoo.But it’s not an easy job ____29___ they have no experience and little money.There are also unexpected ____30___, such as a bear running away one day.This is the story of American movie We Bought a Zoo.It tells the real amazing story of Benjamin Mee.26.A.tigersB.lionsC.animals

27.A.buyingB.visitingC.building

28.A.story bookB.international websiteC.real world

29.A.look forB.look afterC.look up

30.A.findsB.getsC.gives up

31.A.outsideB.insideC.behind

32.A.openedB.closedC.watched

33.A.engineersB.nursesC.zookeepers

34.A.becauseB.thoughC.whether

35.A.surprisesB.joysC.problems

三.閱讀理解40分（A、B、C篇深圳中考，D篇北京中考）

A

The Queen Elizabeth and her sister Margaret had very different characters(性格): Elizabeth was very serious and tidy;Margaret was outgoing and headstrong.But they kept close as sisters.When had lessons at home with their governess Marion Crawford, Margaret was often naughty.Elizabeth always protected her every time when she broke rules.When they grew up, Margaret has sad love stories and unhappy marriage.The Queen gave her a lot of help.Margaret was one of the few people who could lose their temper with the Queen.Even as an adult, she would sometimes shout at her.Once she threw a dishcloth at Elizabeth’s face when they had a picnic.But they never quarreled for long.To Queen Elizabeth, it was a sadness that her sister never found lasting(持久的)personal happiness.36.What kind of person was Elizabeth like? She was ________.A.serious and tidyB.outgoing and tidy

C.easygoing and headstrongD.serious and headstrong

37.The word “governess” means ________.A.服務(wù)員B.家庭女教師C.牧師D.管家

38.Who had an unhappy family life according to the story?

A.Elizabeth.B.Margaret.C.Marion Crawford.D.Both Elizabeth and Margaret.39.According to the story, which of the following is not true?

A.The queen and her sister had quite different characters.B.Elizabeth always protected her sister

C.The sisters often fought each other

D.Elizabeth felt sorry for her sister for her unsuccessful marriage.40.What is the main idea of the story?

A.Elizabeth was a kind person

B.The two sisters lived happily

C.Margaret had sad love stories

D.The two sisters had a very good relationship

B

Shenzhen's fast development has made it become China's most crowded city!There are about 15 million people living on its 1991square kilometers.On each square kilometer averagely live 7500 people.It is 1080 more than that in Hong Kong, and nearly 800 more than that in Guangzhou.Besides, Shenzhen owns 2 million local vehicles, and about 300,000 vehicles from other places also run on the local roads every day.The total length of the city's road is 6041 kilometers.It means each resident only owns 0.58 meters of road!

As a result, the city is facing serious environmental and resource problems.One of the problems is water shortage.The amount of fresh water for each person of the city is only 25% of the country's average.What's more, most of the water drunk by Shenzhen people comes from other areas.41.According to the passage, which of the following makes Shenzhen so crowded?

A.Shenzhen has not enough water.B.There are too many people

C.Shenzhen is developing very fastD.Shenzhen is too small

42.There are _______ people living in Shenzhen now.A.about 1991B.about 15,000,000C.about 150,000D.about 300,000

43.In Hong Kong, there are _______ people on every kilometer.A.about 7500B.about 1080C.about 800D.about 6420

44.Which problem in Shenzhen is not mentioned in the passage?

A.Traffic accidents.B.Water shortage.C.Environmental problemsD.Population problem.45.Which is the best title for this passage?

A.Largest Population in China.B.Biggest Problems in Shenzhen

C.Busiest Roads in ShenzhenD.Most Crowded City in China

C

Old George bought the black gloves for just $35 ten years ago.They were made of lamb skin, soft and warm and very strong.Until then, he had worn cheaper man-made material.Those gloves never lasted longer than three years.He first decided to buy the expensive gloves, because they would make him feel nice in front of others.George never let a drop of water or rain touch his expensive gloves, so they looked new.Losing this favourite thing was almost like losing a child to him.Bad luck!George lost his expensive gloves on New Year's Day’.Back home, George was at a loss.In deep winter, he could not do without a pair of gloves.If he bought cheap ones again, he would have to replace(更換)them very soon.If he bought a new leather pair, it would cost $50 now.He was upset that people no longer returned things they found on the road.After the holiday, poor George decided to buy another leather pair.Before boarding the subway, he went into Value Mart again to see if his gloves had been returned to the Lost and Found Office(失物招領(lǐng)處).“

“What colour are they?” the woman in the office asked again.“Black”, he gave the same answer.She looked into her drawer and drew out a pair of men's leather gloves.”Are they?“

”Yes, Those are mine!" George explained, with great joy in his eyes.46.When did George buy the leather gloves?

A.On New Year's Day.B.Before the holiday.C.Ten years ago.D.In the winter.47.Why did George decide to buy the expensive gloves?

A.Because they were black.B.Because they made him feel good before others.C.Because they had a long historyD.Because they were much cheaper.48.The leather gloves looked new after years because _______.A.George took very good care of them.B.they were soft and warm.C.they were expensive.D.George washed them with water.49.How did George feel when he got home on New Year's Day?

A.He was happy.B.He felt niceC.He was thankfulD.He felt upset

50.About old George, which of the following is true?

A.He was a very rich manB.He never bought cheap gloves

C.He believed somebody would return the gloves to him

D.He hadn't expected to get his gloves back.D

Every year,wildfires(野火)destroy much forest land.Homes are broken down,and thousands of people die.Smokejumpers are helping to stop this.Smokejumpers are a special kind of firefighter.They jump from planes into areas that are difficult to reach by car or on foot.They race to put out fires as fast as they can.At a fire site,smokjumpers first examine the land and decide how to fight the fire.Their main goal is to stop a fire from spreading.Using basic tools such as shovels and axes,smokjumpers clear land of burnable material like plants and other dry material.They carry water with them too,but not much.Although most of smokejumpers are men,more women are joining.Most important are your height and weight.Smokejumpers in the U.S.,for example,must be 54 to 91 kilograms,so they don’t get hurt when they land,or get blown by strong winds.Smokejumpers must also be able to live in the wilderness.In Russia,many smokejumpers know how to find food in the forest and even make simple furniture from trees.The work is dangerous,and the hours are long.But for these firefighters,smokejumping isn’t just a job.They love being able to jump out of planes,fight fires,and live in the forest.As

28-year-old Russian smokejumper Alexi Tishin says,”This is the best job for the strong and brave.”

51.What are smokejumpers?

52.Where do they jump from?

53.What’s the main goal?

54.Why should they have proper weight?

55.What’s needed to be a smokejumper?

四、綜合填空，10分：（河源中考）

Last Sunday, my classmates and I went to Guishan Hill for a picnic.The(56)w______ was fine and all of us were excited and happy.We went there by(57)b_______ with fruit, eggs, meat, vegetables, cookers and some other things.We rode happily all the way.About an hour later, we(58)a_______ at the foot of the hill.There was s big lake and many green trees.Birds were singing songs.How wonderful they were!At noon all of us were busy preparing(59)f_________ the picnic.Some of us were getting the water, some were cooking, and

(60)o_________ were putting a big cloth on the grass.At one o’clock in the afternoon, the lunch was(61)r________.After lunch, we(62)h________ a great time singing, dancing, drinking and talking.(63)A_______ three 0’clock,we began to climb the hill.The hill was quite high, but we all tried to(64)g________ to the top of it.On the(65)t________ of the hill, we felt that we were much closer to the sky, and we saw the flying birds more clearly.五、書面表達：15分（廣州中考）

你是學(xué)校英文報的小記者李華。請給你校初三學(xué)生寫一封公開傍，就如何保持考前健康提出建議。主要內(nèi)容如下：

(1)早睡早起，保持充足睡眠；

(2)飲食均衡，少吃垃圾食品；

(3)多做體育運動；

(4)你的其它建議。

Dear students，As we all know, good health is important for success in the exams，so I’m writing to…

Best wishes and stay healthy．

注意：1．詞數(shù)90左右(信的開頭和結(jié)尾已給出，不計入詞數(shù))；

2．不得透露學(xué)校、姓名等任何個人信息，否則不予評分。

第8周優(yōu)生輔導(dǎo)答題卷

一、聽取信息：

1、____________

2、____________

3、____________

4、____________

5、____________

6、____________

7、____________

8、____________

9、____________

10、____________

11、____________

12、____________

13、____________

14、____________

15、____________

16、____________

17、____________

18、____________

19、____________20、____________

21、____________

22、____________

23、____________

24、____________

25、____________

51.____________________________________________________________.52.____________________________________________________________.53.___________________________________________________________.54.___________________________________________________________.55.___________________________________________________________

四、綜合填空

56.___________57.___________58.___________59.___________

60.___________61.___________62.___________63.___________

64.___________65.___________

五、書面表達：

Dear students，As we all know, good health is important for success in the exams，so I’m writing to

Best wishes and stay healthy．

第三篇：初三尖子生輔導(dǎo)資料2

尖子生輔導(dǎo)資料姓名___________ 單項選擇題。

()1.Juice, water and milk are healthy _________.A.drinksB.drinkC.foodD.foods

()2.Jay doesn’t like junk food, I don’t like it, _______.A.alsoB.tooC.neitherD.either

()3.Her ____ is playing table tennis and her brother is ____ in playing basketball.A.interest, interestedB.interested, interested

C.interest, interestingD.interesting, interesting

()4.I’m busy.I have some windows ________.A.to cleanB.cleanC.will cleanD.for cleaning

()5.There is nothing for him ________.A.worryB.worriesC.to worryD.to worry about

()6.They are told that volunteers _______ in every part of the city now.A.are neededB.needC.are needingD.will be needed

()7.The old man is about ninety years old.He is _____ old _____ walk fast.A.so, thatB.too, toC.such, thatD.enough, to

()8._______ we know, China has the largest population in the world now.A.Now thatB.As farC.So farD.As far as

()9.His aunt ______ a doctor for six years.A.wasB.isC.was beingD.has been

()10.No news _______ good news.A.areB.is aC.is theD.is

()11.Two months _______ passed since Mike flew to America.A.hasB.isC.haveD.was

()12.The Summer English Course must be _______ one month before it begins.A.takenB.costC.paid forD.spent

()13.A: How many lessons do you usually have a day?

B: Seven lessons a day.And each of them _______ 45 minutes.A.lastB.lastsC.haveD.has

()14.My parents always tell me, “Try to be ______ honest child today and

______ useful person tomorrow.”

A.the, theB.a, anC.an, aD.the, a

()15.Children should be taught how to get along with _______.A.anotherB.otherC.othersD.the other

()16.A: I bought the car last week.It’s a second-hand one.B: Well, it’s as __________ as a new one.A.good B.well C.likeD.bad

()17.Is Chengdu the second _______ city in China?

A.largeB.largerC.largestD.much larger

()18.The workers have been working for thirteen hours.Let them stop _______

a rest.A.to haveB.havingC.to makeD.making

()19.Mary’s camera _______.So she can take it with her during the trip.A.fixedB.has fixedC.fixesD.has been fixed

()20.Don’t get _______ with me.It isn’t I who broke the window.A.happpyB.gladC.excitedD.cross

()21.A: What language can the little boy speak?

B: He can speak English _______ Japanese.And he speaks them very well.A.better thanB.butC.as well asD.as if

()22.I think five years ______ a long time.Can we meet once a year?

A.wasB.isC.wereD.be

()23.A: Look!Here comes our school bus.B: No hurry.Don’t get on it ________ it has stopped.A.afterB.sinceC.whenD.until

()24.Hurry up, Tom.We have to get to the airport before 10:00 _______ we can

catch the 11:30 plane.A.so thatB.afterC.sinceD.as soon as

()25.A: Does Mary tell you if she _______ next Monday?

B: No, she doesn’t.But if she ________, I’ll call you.A.will go, will goB.goes, goesC.goes, will goD.will go, goes

()26.If I _____ free tomorrow, I will go to see my grandparents.A.will beB.wasC.amD.have been

()27.I’m sure he will jump up when he _______ the good news.A.learn aboutB.will learn aboutC.learning aboutD.learns about

()28.When all these bridges ______, traveling will become easier.A.will be builtB.are builtC.will buildD.build

()29.My dog has been lost for two weeks _____ it left home.A.whenB.whileC.untilD.since

()30.A friend of ______ was a torchbearer(火炬手)from Yongfu Middle School.A.herB.sheC.hersD.herself

()31.The cinema is near my home.It’s only five _______ walk.A.minutesB.minutes’C.hours’D.hours

()32.Mr.Smith has lost two cars.He has to buy ______ third one.A.aB.anC.theD./

()33.His father is a _______ worker.He always works _______.A.hard, hardlyB.hardly, hardC.hard, hardD.hardly, hardly 補全對話

A: Hello!I’m Peter.B: Hello!I’m Liu Dong.Nice to meet you.A: Nice to meet you, too.B: I’m from China.Where’re you from?

A: I’m from America.How many _________are there in your ___________? B: There’re __________.They’re my grandpa, grandma, father, mother and I.A: What do your parents __________?

B: My father’s a teacher and my mother is a nurse.She works in a big ___________.A: Does your father _________ his job?

B: Sure.He likes teaching very much.What about your parents?

A: Both of them are ___________.They have a big farm and they are __________ doing farm work all day.So I often help them with the work at the weekends.B:Please give my best _________ to your parents.A: Thanks, I will.It’s very __________ of you.

第四篇：初三尖子生的培養(yǎng)

尖子生的培養(yǎng)

西霞院初中

2月15日，在中心校的組織下，我們有機會到會盟一中和送莊初中學(xué)習(xí)，兩所學(xué)校管理上的重“人心”和工作上的“落實”。給我留下了深刻的印象，也對我校今后的管理和日常工作給以一定的影響。接下來我主要談?wù)勛?月15日以來及今后，我校在初三畢業(yè)班尖子生培養(yǎng)方面的工作。

概括來講，就是“一個原則，三個追求”

“一個原則”：——重落實、講實效。

“三個追求：——扎實基礎(chǔ)、熟練技能、良好身心。具體的措施：

1、推行“面批面改”，落實基礎(chǔ)知識。為了使尖子生每節(jié)課所學(xué)的知識都能扎實掌握，開學(xué)初，我校便提出了“面批面改、堂清日清”的要求。每一節(jié)課的重難點，每位上課教師對尖子生一一提問，了解掌握情況，努力做到“堂堂清”。每次作業(yè)，在課堂上盡量留時間完成，尖子生的作業(yè)要面批面改，并要求其建立錯題集。通過作業(yè)反饋，針對于個別沒有掌握住的目標生，在輔導(dǎo)時，作進一步的講解，使之掌握當(dāng)天所學(xué)的內(nèi)容，從而做到“日日清”。

2、利用時間，強化數(shù)英學(xué)科。成立學(xué)習(xí)小組，數(shù)學(xué)、英語教師進行家訪，為學(xué)生講解疑難問題。

3、加強教法研究，熟練答題技能。充分落實教學(xué)的基本要求，加強教法研究，提高課堂效率，讓學(xué)生“得法于課內(nèi)，得益于課外”。

課堂上，重在對目標生的答題指導(dǎo)，真正是尖子生做到學(xué)了、知了、練了之后要拿了，也就是讓他們明白拿分才是最終的目標。

4、建立包聯(lián)機制，全面細致管理。由校領(lǐng)導(dǎo)分包三個班級，各班正副班主任分包尖子生。建立尖子生個人跟蹤管理檔案，對尖子生進行全方位細致管理，包括：學(xué)習(xí)、體育、生活、家庭、心理、個性特點，特別是每次考試成績等。同時包班領(lǐng)導(dǎo)和班主任定期、不定期召開尖子生會議及尖子生家長會。

5、設(shè)計學(xué)習(xí)輔導(dǎo)手冊，真正落實補缺。設(shè)計尖子生學(xué)習(xí)輔導(dǎo)手冊，內(nèi)容包括：學(xué)習(xí)計劃、我的難題、我的建議、我的困惑等；定期上交，及時解決，及時反饋。

總之，只有扎實的基礎(chǔ)+熟練的技能+良好的心態(tài)+正確的策略，方能使尖子生成功增值。

第五篇：初三物理尖子生物理試題

初三尖子生物理試題

班別：姓名；總分：

一、單項選擇題（每小題4分，共28分）

1．在使用家用電器時，下列說法正確的是（）

A．洗衣機使用三孔插座主要是為了防雷擊B．電冰箱緊貼墻壁放置有利于散熱

C．電視機處于待機狀態(tài)時仍會消耗電能

D．電飯鍋的插頭沾水后不能接入電路是因為容易造成斷路

2．關(guān)于聲和電磁波的說法正確的是（）

A．聲和電磁波都能傳遞信息且都可以在真空中傳播

B．住宅安裝雙層玻璃窗可以減小室外噪聲對室內(nèi)的影響

C．“聽診器”能使人的心臟振動幅度增大，響度增大

D．只有主人說出暗語時才能打開“聲紋鎖”，其辨別聲音的主要依據(jù)是音調(diào)

3．小明同學(xué)在家中拍到一張電能表照片，如圖1所示，他仔細觀察照片后，得到下列四個結(jié)論，你認為正確的是（）

A．電能表的額定功率為2500W

B．電能表的標定電流為5A

C．拍照片時，小明家已消耗的電能為9316kW?h

D．拍照片時，小明家已消耗的電能為931.6J

4．下列過程中，物體的重力勢能轉(zhuǎn)化為動能的是

A．跳傘運動員在空中勻速下落的過程

B．熱氣球上升的過程 圖

1C．汽車在水平路面上勻速行駛的過程

D．鉛球自由下落的過程（）

5．隨著國家經(jīng)濟的快速發(fā)展，居民生活水平顯著提高，轎車逐漸走進千家萬戶。關(guān)于轎車所應(yīng)用的物理知識，下列說法不正確的是（）．．．

A．汽車發(fā)動機常用水作為冷卻劑的主要原因是水的比熱容較大

B．安全帶做得較寬，是為了減小壓強和保證安全

C．汽車急剎車時由于慣性還要滑行一段距離 S D．汽車輪胎上的花紋是為了減小與地面間的摩擦

6．如圖2所示的電路中，電源電壓恒定不變，當(dāng)開關(guān)S閉合時（）

A．電壓表示數(shù)變小，電流表示數(shù)變小，燈變暗

B．電壓表示數(shù)變大，電流表示數(shù)變大，燈變亮

C．電壓表示數(shù)不變，電流表示數(shù)不變，燈的亮度不變 2圖

D．電壓表示數(shù)不變，電流表示數(shù)變小，燈變暗37．將質(zhì)量為100g的物體投入盛有100mL酒精的量筒中（已知ρ酒精=0.8×10kg/m），物

體靜止后，酒精液面上升到200mL刻度線處，則該物體在量筒中的情況是（）

A．物體沉在量筒底部B．物體漂浮在酒精液面上

C．物體懸浮在酒精中D．條件不足，無法確定

二、填空題（每空2分，共24分）

8．小華同學(xué)用導(dǎo)線繞在鐵釘上，接入如圖3所示的電路中，制成了一

個_______。閉合開關(guān)S，小磁針靜止時左端應(yīng)為________極，當(dāng)

滑動變阻器的滑片P向左移動時，它的磁性將。

9．如圖5所示是“測量滑輪組機械效率”的實驗裝置，鉤碼總重6N。圖3 實驗時要豎直向上勻速拉動彈簧測力計，由圖可知拉力大小為

______N，若鉤碼上升的高度為8cm，則彈簧測力計向上移動______cm，該滑輪組的機械效率為______%（結(jié)果保留一位小數(shù)）。

10．我國名酒五糧液素有“三杯下肚渾身爽，一滴沾唇滿口香”的贊譽，曾經(jīng)獲得世博會兩屆金獎。有一種精品五糧液，它的包裝盒上標明容3量500mL，（ρ酒=0.9×10kg/m），則它所裝酒的質(zhì)量為kg，將

3圖酒倒出一半以后，剩余酒的密度為kg/m；如果用此瓶裝滿水，則總質(zhì)量比裝滿酒時多kg。

11．如圖6所示，是電熱水器原理的簡易示意圖，通過開關(guān)S可以使熱

水器處于加熱或保溫狀態(tài)。閉合開關(guān)Ｓ時，熱水器處于狀

態(tài)。在熱水器的蓄水桶中裝水至最高水位后，桶中水的質(zhì)量為10kg，則把這些水由28℃加熱到98℃時需吸收熱量J，相當(dāng)于完

3全燃燒kg焦碳放出的熱量。[已知水的比熱容為4.2×10

7J/(kg·℃)，焦碳的熱值為3.0×10J/kg]

圖

三、作圖題（每小題3分，共6分）

12．如圖7所示，金屬小球浸沒于裝有水的容器底部，它共受三個力的作用，試在圖中畫

出其受力示意圖。

13．火車在兩節(jié)車廂之間有兩間廁所，只有當(dāng)兩間廁所的門都關(guān)上時（每扇門相當(dāng)于一個

開關(guān)），車廂中指示牌內(nèi)的指示燈才會發(fā)光，指示牌就會顯示“廁所有人”字樣，提醒旅客兩間廁所內(nèi)都有人。請你把圖8中的各元件符號連接成符合上述設(shè)計要求的電路圖。

圖圖7

四、實驗探究題（每空2分，共18分）

14．在探究“固體熔化時溫度的變化規(guī)律”實驗中，某實驗小組的同學(xué)根據(jù)測得的數(shù)據(jù)繪

制了如圖9所示的圖象。

(1)由圖象可看出該物質(zhì)的熔點是℃，在第2min末該物質(zhì)處于（選填“固態(tài)”、4“液態(tài)”或“固液共存狀態(tài)”）。

2（2）該物質(zhì)熔化過程的特點是不斷吸熱，溫

?2度，內(nèi)能。?4Ａ（3）比較圖中ＡＢ段和ＣＤ段可知，如果升高

圖9 相同的溫度，段吸收的熱量較多。

15．白熾燈泡在生活中隨處可見，如果我們仔細觀察就會發(fā)現(xiàn)有很多大家學(xué)習(xí)過的物理知

識。請同學(xué)們完成如下幾個問題：

（1）白熾燈泡正常發(fā)光時，電流通過燈絲做功將能轉(zhuǎn)化為內(nèi)能和光能。

（2）白熾燈泡使用時間久后亮度比新買時暗，是由于燈絲受熱（填物態(tài)變化名稱），電阻變大，燈泡的實際功率（選填“變大”、“變小”或“不變”）的緣故。

（3）白熾燈泡發(fā)出的光向四面八方傳播都遵循光的規(guī)律。

五、計算題（每小題4分，共24分）

16．如圖14所示，物體A的質(zhì)量m =12kg，在拉力F的作用下，物體A以0.1m/s的速度

在水平面上做勻速直線運動，彈簧測力計的示數(shù)為12N，忽略滑輪與繩子的摩擦力以及滑輪、彈簧測力計和繩子所受的重力，并且繩子足夠長。求：

（1）物體A與水平面間摩擦力f的大小；

（2）拉力F的大?。?/p>

（3）物體A運動10s的過程中，拉力F所做的功。

圖14

17．如圖15所示是一直流電動機提升重物的裝置。已知重物質(zhì)量m=50kg，電源電壓U=110V

保持不變，電動機線圈的電阻R=4Ω，不計各處摩擦，當(dāng)電動機以某一速度勻速向上提升重物時，電路中的電流I=5A（g=10N／kg）。求：

（1）電源的輸出功率；

（2）電動機線圈電阻R的發(fā)熱功率；

（3）試從能量轉(zhuǎn)化和守恒的角度，求重物上升的速度大小。