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八年級物理浮力計算題3篇(經(jīng)典八年級物理浮力計算題)

時間:2022-12-24 15:22:30 綜合范文

  下面是范文網(wǎng)小編整理的八年級物理浮力計算題3篇(經(jīng)典八年級物理浮力計算題),供大家閱讀。

八年級物理浮力計算題3篇(經(jīng)典八年級物理浮力計算題)

八年級物理浮力計算題1

  21.—Is it _________ bag?—No, it’s an old cap

.

  22.—What does your brother look like?—He is _____________.

and and handsome

  23.—You swim so taught you?—Learn by __________.

mother is ill in have to ___________ my grandparents at at

  25.—Are you afraid of dogs?— ______________., I , I , I don’, I did.—What _______ do you choose, small, medium or large?

—Large,

  27.—Our classroom is so clean.—It ___________ every cleaned cleaned

  28.—There’s going to _______ an English evening tonight? Would you like to go with us?—I’d love

  29.—What can I do for you?—_________________.’m just ’ll take ’m just it easy 30.—May I play computer games, Mom?—No, you ____________.’t

’’’t

  31.—Jane, when did you come here?

—In ___________ here for two been gone been

  32.—I really hate to go to such a noisy place.—_____________. am do I

have can I

  33.—__________ go out for a picnic next Saturday.—Good about

you like ’s

  34.—__________ do you go to the library?

—Twice a much

often

far

  35.—I wonder ____________ at 8:00 last night?

—I was watching were you did you do

you were doing

are you doing

  II.完形填空(10分)(閱讀下面短文,然后根據(jù)短文內(nèi)容,從三個選

  項中選擇能填入相應(yīng)空白處的最佳選項,并在答題卡的相應(yīng)位置將其涂黑)

  Showing your feeling is is a mistake not to talk to anyone ___36_ you’re feeling sad, worried or you keep bad feelings inside, it can even make you37 _.But if you38with someone, like your mom or dad, you’ll usually begin to feel 39_than you’re not all alone with your problems or , it doesn’t mean your problems and worries will41magically(神奇地).But, at least, someone else understands what’s42with you and can help43find ways to solve your mom and dad want to know if you love you and they want to know what’s happening in your if you don’t want to talk with them, what should you do? Find a trustworthy(可信任的)teacher at school or a that person can help you deal with your you’ll feel as45as

  III、情景交際(15分)

(1)從B欄中找出與A欄相對應(yīng)的答語,并在答題卡的相應(yīng)位置將其涂黑。(5分)A

  B

weekends!!Who’s this, please? yourself to some you very ’s the date today? do you do? , may I speak to Mike?

same to do you do? 23rd, 2013.(2)從框里選擇填入對話相應(yīng)空白處的適當(dāng)選項,并在答題卡的相應(yīng)位置將涂黑

like a quiet yourself in the do you want to live in the countryside?

are you going to do in the summer holidays?

animals give us joy and can help us do some useful things

  A: Hi, Darren!It’s a nice day, isn’t it? B: Yes,it ____

  A: I plan to visit my grandparents during the summer holidays in the :Really? 52_________

  A: Because of too much noise in the _________.What’s more, there are many green plants in the like : I also like plants, but I like animals :Why do you think so?

  B: 54_________ They are our : I think I should also make an animal friend

  A: I think I should also make an animal : 55_____________ A: Thank you

  閱讀理解(40分)

  I、閱讀理解(20分)(閱讀I和II兩篇短文,從56-65每小題所給的選項中選出最佳答案,并在答題卡的相應(yīng)位置將其涂黑。

  IWonderful Tour(4-Day)of Tongren

  Overseas Tourist Corporation Guizhou China Including:

  Places to visit:Price: Only ¥2,668★A round-trip(往返旅行)plane ticket from Guiyang to Tongren ★Bus service around Tongren ★Three nights’stay in good hotels ★The best tour guide service

★Ming Paradise(大明邊城)—the national AAAA level scenic spots(景點)★Hot Spring in Shiqian(石阡)—enjoy spas/spring bath(泡溫泉/溫泉浴)★Mount Fanjing—the most famous mountain in Guizhou Office hours:

  Monday-Friday8:00 -8:00 &Sunday9:00 -7:00 : 0851-Address: Yanan Road Guiyang

the information above, we know this map

air piece of news

ad.(advertisement) can’t enjoyin a bus around Tongren

in good hotels

some small presents a good tour guide service can visit ___________ places if you take the

can you book the tour? writing chatting with them sending them an can you go to book a ticket to Tongren?

station

Yanan Road Guiyang

  II

  In the year 2050, there will be different kinds of materials for materials will keep the clothes clean for will never get dirty or wear will have less work because we won’t have to wash we can save water and children won’t worry about what to wear to school every won’t go to ’ll stay at home in front of their computers to can wear their favorite “Saturday clothes” every will be you think so? What do you think school clothes and school life will be like in 2050?

wewash clothes in the year ’’t

’t

’t be allowed to won’t the children go to school? they’ll play at they hate to go to they’ll study on the they’ll wash clothes to make the clothes get dirty in the year 2050?

, it won’, they , it , they won’ the year 2050, the clothes will notfor ever out or get thinner and fantastic

the passage,which of the following is NOT true? will be different kinds of materials for children can wear their favorite children always worry about what to children can study at home in front of their 、閱讀判斷(10分)(根據(jù)短文內(nèi)容判斷66-70題的正誤。正確的用A,錯誤的用B,并 在答題卡的相應(yīng)位置將其涂黑)

  Robots have been designed to do many things, such as saving people, working in a hospital, serving for us and so are some robots working in the Jinjiang Robot Hotel in Tongren, hundred customers can have a big dinner in it of the robots serve drinks, while the other four serve the not all the work in the restaurant is done by are also people working there, especially in the cooks are humans, because the robots don’t have the skills to can work in a robots work in the Jinjiang Robot people work in the can serve drinks and the robots can cook delicious 任務(wù)型閱讀(10分)

  本部分試題在卷II(76-80小題)

  卷II

  聽力II(10分)(聽一篇短文,根據(jù)所聽到的短文內(nèi)容填寫表格。每空一詞。答案務(wù)必另 書寫于答題卡卷II各小題規(guī)定的位置。)Before dinner Arrive on 71.____________You’d better bring a 72._________ gift

  During dinner Just 73.________ what you dinner

  Don’t leave at once or stay too 74.___ ___

  Call the host or write a thank-you 75.___ ___

  任務(wù)型閱讀(10分)(閱讀下面短文,然后根據(jù)短文內(nèi)容每空填寫一個單詞完成76—80 小題。答案書寫于答題卡卷II各小題規(guī)定的位置。)

  Richard, 14, said, “ I want to make friends, but I don’t know my last school, my classmates often bullied(欺負(fù))me and I didn’t have any at this school look OK, but I just know I’ll also do something help me!”

  Perhaps the best way to make friends is to know what makes a asked some 13-year-old boys and girls to write down they liked about their said that good friends:

★go around with happy faces.★like to share.★stay and play together with others.★invite people to do something★are humorous.★are good at organizing games.★help others with work.★are kind.★ are good at thinking of something fun to do

  Good friends

  Go around 76.__________ happy faces like to share

  Stay and play together with _________ others with 78.________ and __________ people to do good at organizing games and thinking of something 80._________to do

  書面表達(dá)(40分)

  I.單詞拼寫(10分)

  I.根據(jù)括號里所給單詞(漢語)的適當(dāng)形式填空。答案書寫于答題卡卷II各小題規(guī)定的位置。 of us should love our lives and obey the traffic __________(規(guī)則). along this road and turn ________(左邊)at the second are often ________(忙碌的)with their harvest in , the capital of China, is one of the oldest ________(city)in —What’s the secret of your ________(success)?

—Work hard.書面表達(dá)(40分)

  I.單詞拼寫(10分)

  I.根據(jù)括號里所給單詞(漢語)的適當(dāng)形式填空。答案書寫于答題卡卷II各小題規(guī)定的位置。 of us should love our lives and obey the traffic __________(規(guī)則). along this road and turn ________(左邊)at the second are often ________(忙碌的)with their harvest in , the capital of China, is one of the oldest ________(city)in —What’s the secret of your ________(success)?

—Work 短文改錯(10分)

  下列短文的劃線部分是錯誤的,請將其正確答案書寫于答題卡卷II各小題規(guī)定的位置。Twenty years old, an old man who is over older, went to see his son was happy his mother and picked up the phone and said,93.“Hello, bring me any good food.” A moment later, beautiful girl brought the food “What magical the phone is!” the old man

to a little days,he went back to his the picked up the phone as soon as he gets said, “Hello, some delicious food, please.” Then he waited waited or nobody brought him

  III.寫作(20分)

  溫馨提示:(作文書寫于答題卡卷II規(guī)定的位置。)

  在銅仁市開展“4+2”特色教育活動中,你是怎么做的。請根據(jù)內(nèi)容提示,用英語寫一篇短文。

  內(nèi)容提示:每天早上做早操......每天課外活動時間打球、唱歌、跳舞.....每天至少運動一小時我擅長......參考詞匯: do morning exercisesplay basketball/ping pongdancesong songshave at least...for sports every daybe good at/do well inwin 要求:

  1.語言表達(dá)準(zhǔn)確,語意通順、連貫; 2.書寫工整、規(guī)范;

  3.根據(jù)所給內(nèi)容和參考詞匯,可適當(dāng)發(fā)揮; 4.文中不得出現(xiàn)真實的校名和人名;

  5.詞數(shù):70詞左右。文章的開頭,和結(jié)尾己給出, 不計入總詞數(shù)。

  Students all take an active part in Tongren Four and Two Special Education Acitivities in our morning, I

  綜合運用 21-55滿分40分.(21-50每小題1分;51-55每小題2分;)

閱讀理解(56-70每小題2分,滿分30分)

  卷II

  聽力II(71-75每小題2分;滿分10分)

任務(wù)型閱讀(76-80每小題2分;滿分10分)

  書面表達(dá)(81-100每小題1分;作文滿分20分;滿分40分)I.單詞拼寫(10)

  I.短文改錯(10)

八年級物理浮力計算題2

  物理學(xué)史集中地體現(xiàn)了人類探索和逐步認(rèn)識世界的現(xiàn)象,結(jié)構(gòu),特性,規(guī)律和本質(zhì)的歷程.隨著科學(xué)的發(fā)展,我們更要重視物理學(xué)。因此小編準(zhǔn)備了八年級下物理浮力課件,歡迎閱讀。

  1、浮力的定義:一切浸入液體(氣體)的物體都受到液體(氣體)對它豎直向上的力 叫浮力。

  2、浮力方向:豎直向上,施力物體:液(氣)體

  3、浮力產(chǎn)生的原因(實質(zhì)):液(氣)體對物體向上的壓力大于向下的壓力,向上、向下的壓力差 即浮力。

  4、物體的浮沉條件:

(1)前提條件:物體浸沒在液體中,且只受浮力和重力。

(2)請根據(jù)示意圖完成下空。

  下沉 懸浮 上浮 漂浮

  F浮 G F浮 = G F浮 G F浮 = G

  物 液 物

(3)、說明:

① 密度均勻的物體懸浮(或漂浮)在某液體中,若把物體切成大小不等的兩塊,則大塊、小塊都懸浮(或漂浮)。

②一物體漂浮在密度為的液體中,若露出體積為物體總體積的1/3,則物體密度為(2/3)

  分析:F浮 = G 則:液V排g =物Vg

  物=(V排/V)?液= 2 3液

③ 懸浮與漂浮的比較

  相同: F浮 = G

  不同:懸浮液 =V排=V物

  漂浮液 物;v排④判斷物體浮沉(狀態(tài))有兩種方法:比較F浮 與G或比較液與物。

⑤ 物體吊在測力計上,在空中重力為G,浸在密度為的液體中,示數(shù)為F則物體密度為:物= G/(G-F)

⑥冰或冰中含有木塊、蠟塊、等密度小于水的物體,冰化為水后液面不變,冰中含有鐵塊、石塊等密大于水的物體,冰化為水后液面下降。

  5、阿基米德原理:

(1)、內(nèi)容:浸入液體里的物體受到向上的浮力,浮力的大小等于它排開的液體受到的重力。

(2)、公式表示:F浮 = G排 =液V排g 從公式中可以看出:液體對物體的浮力與液體的密度和物體排開液體的體積有關(guān),而與物體的質(zhì)量、體積、重力、形狀、浸沒的深度等均無關(guān)。

(3)、適用條件:液體(或氣體)

  6、漂浮問題五規(guī)律:(歷年中考頻率較高,)

  規(guī)律一:物體漂浮在液體中,所受的浮力等于它受的重力;

  規(guī)律二:同一物體在不同液體里,所受浮力相同;

  規(guī)律三:同一物體在不同液體里漂浮,在密度大的液體里浸入的體積小;

  規(guī)律四:漂浮物體浸入液體的體積是它總體積的幾分之幾,物體密度就是液體密度的幾分之幾;

  規(guī)律五:將漂浮物體全部浸入液體里,需加的豎直向下的外力等于液體對物體增大的浮力。

  7、浮力的利用:

(1)、輪船:

  工作原理:要使密度大于水的材料制成能夠漂浮在水面上的物體必須把它做成空心的,使它能夠排開更多的水。

  排水量:輪船滿載時排開水的質(zhì)量。單位 t 由排水量m 可計算出:排開液體的體積V排=;排開液體的重力G排 = m g;輪船受到的浮力F浮 = m g 輪船和貨物共重G=m g。

(2)、潛水艇:

  工作原理:潛水艇的下潛和上浮是靠改變自身重力來實現(xiàn)的。

(3)、氣球和飛艇:

  工作原理:氣球是利用空氣的浮力升空的。氣球里充的是密度小于空氣的氣體如:氫氣、氦氣或熱空氣。為了能定向航行而不隨風(fēng)飄蕩,人們把氣球發(fā)展成為飛艇。

(4)、密度計:

  原理:利用物體的漂浮條件來進(jìn)行工作。

  構(gòu)造:下面的鋁粒能使密度計直立在液體中。

  刻度:刻度線從上到下,對應(yīng)的液體密度越來越大

  8、浮力計算題方法總結(jié)

(1)、確定研究對象,認(rèn)準(zhǔn)要研究的物體。

(2)、分析物體受力情況畫出受力示意圖,判斷物體在液體中所處的狀態(tài)(看是否靜止或做勻速直線運動)。

(3)、選擇合適的方法列出等式(一般考慮平衡條件)。

  計算浮力方法:

①稱量法:F浮= G-F(用彈簧測力計測浮力)。

②壓力差法:F浮= F向上-F向下(用浮力產(chǎn)生的原因求浮力)

③漂浮、懸浮時,F(xiàn)浮=G(二力平衡求浮力;)

④F浮=G排 或F浮=液V排g(阿基米德原理求浮力,知道物體排開液體的質(zhì)量或體積時常用)

⑤根據(jù)浮沉條件比較浮力(知道物體質(zhì)量時常用)

八年級物理浮力計算題3

  浮力計算專題

  1、如圖15所示,容器中裝有水,水中有一個木塊被細(xì)線系著,已知水重200N,水深為,木塊的體積為4dm,木塊的密度為×10kg/m,試求:(1)木塊受到的浮力是多大?

(2)若繩子斷了,最終木塊漂浮在水面上時,所受的浮力為多大? 3332、用一彈簧測力計掛著一實心圓柱體,圓柱體的底面剛好與水面接觸(未浸入水)如圖甲,然后將其逐漸浸入水中,如圖乙是彈簧測力計示數(shù)隨柱體逐漸浸入水中的深度變化情況,求:(g取10N/kg)(1)圓柱體受的最大浮力。(2)圓柱體的密度。

  3、一個不規(guī)則的實心物體,質(zhì)量55g,放入裝滿純水的燒杯中,沉入底部,排開的水。然后向燒杯中加鹽并攪拌,直到物體懸浮為止。g=10N/kg)求:(1)物體在純水中所受的浮力;(2)物體的體積:

(3)物體懸浮時鹽水的密度。

  5、一帶閥門的圓柱形容器,底面積是300cm2,裝有13cm深的水。正方體A邊長為12cm,重25N,用細(xì)繩懸掛放入水中,有1/6的體積露出水面,如圖11所示。試求:(1)A受到的浮力

(2)若細(xì)繩所能承受的最大拉力是,通過閥門K緩慢放水,當(dāng)繩子剛要被拉斷的瞬間,容器中液面下降的高度。(取g =10N/kg)

  7、密度是×10 kg/ m的木塊,體積是4 m當(dāng)它浮在水面上時,取g=10 N/kg,求: 3

  33(1)木塊重力;

(2)木塊受到的浮力;(3)木塊排開水的體積;(4)木塊露出水面的體積.8、如圖所示,水面上漂有一塊體積為2米的浮冰,露出水面的體積為米。求:該冰塊受到的浮力。

  33,9、有一體積為1×10千克/米,求:(1).鐵塊的重力。(2).鐵塊所受到的浮力。(3).彈簧秤的示數(shù)。3-4米3的實心鐵塊,掛在彈簧秤上后浸沒在水中(鐵塊沒有接觸容器底部),鐵的密度為×、有一密度為,邊長為10cm的立方體木塊浸在水中,如圖5所示,若用對木塊的拉力是N,求木塊此時受到的浮力?(用三種方法)

  13、一個物塊浮在水面上,它沒入水中部分的體積是50cm,露在水面上的部分體積是25cm。

  33(1)物塊受到的浮力多大?(2)物塊的質(zhì)量是多大?(3)物塊的密度是多大?

  14、彈簧秤下掛一個物體,在空氣中讀數(shù)是 N,當(dāng)物體全部浸入水中時,彈簧秤示數(shù)是 N.求:(1)物體受到的浮力;(2)物體的體積;

(3)物體的密度.(g =10 N/kg)

  15、把一個外觀體積為的空心銅球放入水中,它恰好處于懸浮狀態(tài),已知銅的密度是×10kg/m,g取

  N/kg。求:

(1)空心銅球的重力;(2)銅球空心部分的體積。

  16、用彈簧測力計測石塊,其重為9.8N,若把石塊的一半浸沒于水中,彈簧測力計的讀數(shù)為7.84N,(ρ10kg/m)則: 3

  3煤油

=×⑴.此石塊所受到的浮力是多大? ⑵.這種石塊的密度是多少? ⑶.若把石塊全部浸入煤油中,彈簧測力計的讀數(shù)將變?yōu)槎啻?

  17、一艘潛水艇的體積為,其內(nèi)部水箱的容積是,當(dāng)它在水下勻速航行時,水箱正好灌滿水,此時潛水艇受到的浮力是多少?當(dāng)潛水艇排完水箱中水時,潛水艇勻速航行時受到的浮力是多少?(海水密度為,23、將邊長是10cm的實心立方體木塊輕輕地放入盛滿水的大水槽內(nèi).待木塊靜止時,從水槽中溢出了600g水,g取10N/kg,求:

(1)木塊受到的浮力;

(2)木塊的密度;)

  一、計算題

  1、(1)水對容器底部的壓強(qiáng)是:p=ρ木塊受的浮力是:F=ρ水

  水

  Gh=1×103×10×=5×103Pa………………(2分)gV木=1×103×10×4×10-3=40N………………(2分)(2)最終木塊漂浮在水面上時,所受的浮力時:

  F′=G木=ρ水gV木=×103×10×4×10-3=24N………(2分)因為木塊浮出水面的過程中,水面下降,所以此時水對容器底的壓強(qiáng)比第(1)問中的小…………(1分)

  2、(1)由題意可知F浮=G-F==(2)由圖可知,圓柱體剛浸沒時下表面距水面距離為 h=12cm= ∵P=gh∴P=1×10kg/m×10N/g×=×10Pa V排g

  4333

  3‘(3)∵F浮=∴V排=F浮/液水g=/1×10×10=×10m

  圓柱體浸沒V物=V排 又G=mg=∴物V物g-4

  33=G/V物g=/×10×10=×10kg/m

  3、(1)F浮=G排=(2)G排=ρ水gV排

  浸沒時V物= V排=5×10m

(3)因為物體懸浮, 所以ρ鹽水-53=ρ物 =m物/V物=/(5×10m)=×10kg/m

  3-、本題要求學(xué)生會結(jié)合二力平衡知識,用簡單公式計算質(zhì)量、密度、浮力,認(rèn)真學(xué)習(xí)的同學(xué)都能夠做好.難度系數(shù).正確答案:(1)160 kg

(2)800 kg/ m(3)1600N

  5、解:容器中水的積為:V水= SH =×10m, 正方體的體積為VA= L3=×10m。-3

  3-3

  3(1)A受到的浮力為:F浮=ρ水gVA=。設(shè)A放入水中后水深為H′,則有

  SH′= V水+VA,所以H′=。

  3此時水對容器底部的壓強(qiáng)p =ρ水gH′=×10Pa。(2)初始A浸入水中深度為h0=5L/6=10cm。當(dāng)繩子剛被拉斷時有:Fm+F浮′= G,所以F浮′=。設(shè)此時A浸入水中深度為h,則有F浮′=ρ水gL2h。所以h =7cm,Δh = h-h =3cm。

  6、精析 分別對木塊所處的幾種狀態(tài)作出受力分析.

  如圖3(a)(b)(c).

(a)

(b)

(c)

  圖(a)中,木塊受拉力F1,重力和浮力.

  圖(b)中,細(xì)線剪斷,木塊處于漂浮狀態(tài),設(shè)排開水的體積為V排

  圖(c)中,將露出水面的部分切去后,木塊仍漂浮,這時再

  施加F2=1 N的壓力,仍有部分體積露出水面.

  已知:F=2N,F(xiàn)=1N,V′=20cm

  3—2×10—

  5m31

  2求:水

  解 根據(jù)三個圖,木塊均靜止,分別列出受力平衡過程

  將公式中各量展開,其中V排指圖(b)中排開水的體積.

  代入數(shù)值事理,過程中用國際單位(略)

  水V—木V=

  水V排—木V

(—5水V排—木V排)=+水

×2×10

  約去V×103

  kg/m3排和V,求得:水=

  答案 木塊密度為×103kg/m3

. 7、2400 2400

  8、V3

  排=V物-V露=2米-米=米

  F?。溅阉?g V排

=×103千克/米3×牛/千克 ×米3

  1分=牛

  1分

  1分 1分

  9、(1).m=ρV =×10千克/米×1×10米=千克

  2分 G=mg =千克×牛/千克=牛

  2分(2).F浮=ρ3水33-43gV排

  3-

  43=×10千克/米×牛/千克×1×10米 =牛

  3分(3).彈簧秤示數(shù)為

  F= G-F浮

=牛-牛=牛

  2分 說明:(1)、(3)小題中公式1分,代入與結(jié)果1分

(2)小題公式1分,代入1分,結(jié)果1分

  10、解法一:根據(jù)浮力產(chǎn)生的原因求解 即:

  解法二:根據(jù)阿基米德原理求解。解法三:根據(jù)木塊受到的力求解。

  排

  11、精析 這道題可以用計算的方法來判斷,關(guān)鍵是比較兩個體積,一是冰熔化前,排開水的體積V,一個是冰熔化成水后,水的體積V.求出這兩個體積,再進(jìn)行比較,就可得出結(jié)論. 水

  解(1)如圖5(a)冰在水中,熔化前處于漂浮狀態(tài).

  F=G 浮冰 水g V=mg 排冰

  V=排

  水

  冰

  冰熔化成水后,質(zhì)量不變:m=m

  求得:V=水水=排

  比較①和②,V=V

  也就是冰熔化后體積變小了,恰好占據(jù)了原來冰熔化前在水中的體積. 所以,冰在水中熔化后液面不變

(2)冰在鹽水中:冰熔化前處于漂浮,如圖5(b),則

  F 鹽?。紾 冰鹽水g V排鹽=mg 冰

  V排鹽=

  冰熔化成水后,質(zhì)量不變,推導(dǎo)與問題(1)相同.

  V=水

  水

  比較①和②,因為

∴ V=V水排排=鹽水

  也就是冰熔化后占據(jù)的體積要大于原來冰熔化前在鹽水中的體

  所以,冰在鹽水中熔化后液面上升了。

  答案(1)冰在水中熔化后液面不變.(2)冰在鹽水中熔化后液面上升。

  思考 冰放在密度小于冰的液體中,靜止后處于什么狀態(tài),熔化后,液面又如何變化?

  12、精析 從受力分析入手,并且知道冰熔化,質(zhì)量不變,體積減小,造成液面下降。

  已知:S=50cm,h=,h= 21

  2求:冰石

  23石

  解 V+V=Sh=50cm×=230 cm冰熔化后,水面下降h.

  V′=hS=×50cm=22 cm 2

  32∵ m=m 冰水 冰V=冰水V 水 ==,V=水V 冰

  V′=V-V=V-冰水冰V=冰V

  冰

=22 cm 3冰

  V=230 cm—220 cm=10 cm 3

  33石

  冰、石懸浮于水中:

  F=G+G 浮冰石 水g(V+V)=冰石水g V+冰

  水

  G V

  石 石=

=/

  3答案 石塊密度為/

  13、(1)(2)(3)/cm

  14、(1) N

(2)×10m

  5(3)×10 kg/m

  15、(1)由空心銅球懸浮在水中可知 V=V=

  3排

  球根據(jù)阿基米德原理得:

  F=浮液g V=×10×10××10=

  3-6排

  浮由懸浮條件可知空心銅球的重力 G=F=(2=和G=mg 可知

-6

  3實

  3空心銅球的實心部分體積 V===2×10m=2cm

  空心銅球中空心部分的體積 V=V-V= 空

  實16、1.96N、2.5×10Kg/m、5.88N 3317、(1)(1分)(N)(1分)

(1分)

(2)(1分)(1分)

(N)(1分)

(N)(1分)

  18、(1)(2)

  即:

(3)

  19、(1)(2)

(3)20、21、(1)F浮=G排=ρ

  33-6

  3水

  GV排=×10kg/m×10N/kg×200×10m=2N

  1分

(2)燒杯和水的重力、物體A對水向下的作用力(或物體A受到的浮力)注::回答“燒杯和水的重力”

┉┉┉┉┉┉┉┉1分

  回答“物體A對水向下的作用力(或物體A受到的浮力)”

┉┉┉┉┉┉┉┉1分

  22、分析:A、B分開之前漂浮在水面上,則有上,則有三個方程相減得:解:原情況A、B疊放在一起時,漂浮在水面上,則有:A、B分開后B仍漂浮,A沉入水底,則有: ③

①-②-③得:∴

  23、⑴6N;

⑵×10kg/m

  33;,將A取下投入水中靜止后,物體B仍漂浮在水面,以上,而A沉入容器底部受三個力作用,即重力、支持力、浮力。則有

  可求出N。

②,而

⑶600Pa.

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