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如图所示,一足够长的木板在光滑水平面上以速度v向右匀速运动,现将质量为m的物体竖直向下轻轻地放置在木板上的右端,已知物体和木板之间的动摩擦因数为μ.为保持木板的速度不变,须对木板施一水平向右的作用力...
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高三下学期物理《》真题及答案
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如图所示在光滑的水平面上有一质量M.=3kg的薄板和一质量m=1kg的物块朝相反方向运动初速度大小都
做加速运动
做减速运动
做匀速运动
以上运动都有可能
如图所示质量为5m的足够长的木板以速度v0在光滑的水平面上向左运动另一个质量为m的小石膏块以同样大小
如图9所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦.现用水平力向右拉木板
物块先向左运动,再向右运动
物块向右运动,速度逐渐增大,直到做匀速运动
木板向右运动,速度逐渐变小,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
如图质量为4kg的木板放在光滑水平面上质量为1kg的物块放在木板上它们之间有摩擦木板足够长最初两者都
加速运动
减速运动
匀速运动
静止不动
如图所示在光滑的水平面上有一足够长的质量为M=4kg的长木板在长木板右端有一质量为m=1kg的小物块
如图所示质量为3kg的木板放在光滑水平面上质量为1kg的物块在木板上它们之间有摩擦木板足够长两者都以
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动,再向右运动
物块向右运动,速度逐渐增大,直到做匀速运动
木板向右运动,速度逐渐变大,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动,再向右运动
物块向右运动,速度逐渐增大,直到做匀速运动
木板向右运动,速度逐渐变小,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
如图所示A.B.是两块完全相同的长木板长度均为L.质量为m两板间动摩擦因数为μ将两者边缘对齐叠放在光
如图6所示一足够长的木板在光滑的水平面上以速度v向右匀速运动现将质量为m的物体竖直向下轻轻地放置在木
mv2/4
mv2/2
mv2
2mv2
如图所示沿竖直杆以速度v匀速下滑的物体
通过轻质细绳拉光滑水平面上的物体
,细绳与竖直杆间的夹角为θ,则以下说法正确的是( )
A.物体B.向右匀速运动B.物体B.向右匀加速运动
细绳对A.的拉力逐渐变小
细绳对B.的拉力逐渐变大
如图所示一足够长的木板在光滑水平面上以速度v向右匀速运动现将质量为m的物体竖直向下轻轻地放置在木板
mv
2
2mv
2
如图所示一足够长的木板在光滑的水平面上以速度v匀速运动现将质量为m的物体竖直向下轻轻地放置在木板上的
mv
2
2mv
2
2017年·安康二模如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦.现
物块向右运动,速度逐渐增大,直到做匀速运动
物块先向左运动,再向右运动
木板向右运动,速度逐渐变小,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
如图在光滑的水平面上有一质量为M=3kg的木板木板上有质量为m=1kg的物块.它们都以v=4m/s的
做减速运动
做加速运动
做匀速运动
以上运动都有可能
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动,再向右运动
物块向右运动,速度逐渐增大,直到做匀速运动
木板向右运动,速度逐渐变小,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
水平面上有质量为M.的长木板一质量为m的小铁块以初速度大小v0从长木板的中点向左运动同时长木板在水平
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动,再向右运动
物块向右运动,速度逐渐增大,直到做匀速运动
木板向右运动,速度逐渐变小,直到做匀速运动
木板和物块的速度都逐渐变小,直到为零
如图所示一足够长的木板在光滑的水平面上以速度v匀速运动现将质量为m的物体竖直向下轻轻地放置在木板上的
mv
2
2mv
2
如图所示光滑水平面上有一长木板长木板的上表面也是水平光滑的右端用不可伸长的轻绳拴在墙上左端上部固定一
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已知函数. Ⅰ求fx的最小正周期 Ⅱ求fx在区间上的最大值和最小值.
某校高一高二年级的全体学生都参加了体质健康测试测试成绩满分为100分规定测试成绩在[85100]之间为“体质优秀”在[7585之间为“体质良好”在[6075之间为“体质合格”在[060之间为“体质不合格”.现从两个年级中各随机抽取8名学生测试成绩如下 其中ab是正整数. Ⅰ若该校高一年级有200名学生试估计高一年级“体质优秀”的学生人数 Ⅱ从高一年级抽取的学生中再随机选取3人求这3人中恰有1人“体质良好”的概率 Ⅲ设两个年级被抽取学生的测试成绩的平均数相等当高二年级被抽取学生的测试成绩的方差最小时写出ab的值.结论不要求证明
8分WhatwouldyouthinkifsomeonesuggestedknockingdownStPaul'sCathedraltowidentheroad?OrpullingdownBigBentomakewayforacarpark?Itwouldberidiculousright?Butwhenitcomestodestructionofthenaturalworldwearen'tsoeasilyshocked.Butweshouldbe…orwe'llbeinalotoftrouble. Natureisshrinkingbytheday.Ancientforestsaredestroyed.Wetlandsarebecomingdry.Woodlandisdisappearingandallinthenameofprogress.Thisisbadinitselfbutit'sdestructingforbiodiversity. Biodiversityreferstothevarietyofplantsanimalsandotherlivingthingsthatareallinterconnected.Theecologicalservicesprovidedbybiodiversityarevitaltoeverydaylife.Theairwebreatheisaproductofphotosynthesis光合作用bygreenplants.Insectswormsandbacteriabreakdownwasteandmakesoilsrich.Andtinyorganismscleanthewaterinriversandsea.Infactalllifeontheearthexiststhankstothebenefitsofbiodiversity.Morethan90percentofthecaloriesconsumedbypeopleworldwideareproducedfrom80plantspecies.And30percentofmedicinesaredevelopedfromplantsandanimals.Maintainingawidediversityofspeciesineachecosystemisnecessarytopreservealllivingthings. Thelossofbiodiversitycouldbedevastating.ItiswrongtothinkthatbiodiversitycanbereducedindefinitelywithoutthreateninghumanssaidHarvardUniversitybiologistEdwardO.Wilsonknownasthefatherofbiodiversity.HewarnedWeareabouttoreachacriticalpointbeyondwhichbiodiversitylosswillbecomeirreversible不可挽回的. Butwhatcanwedo?Thepresentproblemisthattheconceptofbiodiversityisnotsoclear.Peoplemightcareaboutgiantpandasbutitismuchhardertoexcitethemaboutthefateoftinyseacreatureswhicharebeingboiledtodeathinthecoolingsystemsofpowerstationsalongcoastlines.TheGuardiannewspaperistryingtohelp.IthaslaunchedtheBiodiversity100campaigntotrytoconvincegovernmentsaroundtheworldtotakeactiontodealwiththewidespreadconcernsaboutbiodiversity.ThisincludespersuadingtheUKgovernmenttocreateaseriesofmarinereservestoreservethedecreaseinthesea﹣lifecausedbyindustrialfishingstoppingfishingsharksbytheJapanesefishermenandbanningthekillingofdingoes澳洲野犬inAustraliaamongmanyotherthings. Thereisalottodo.Andwe'dbetteractquicklyifwedon'twanttoendupwithaplanetthatcan'tsustain维持life! 32.ThewriterthinksittopulldownBigBentomakewayforacarpark. A.unreasonable B.necessary C.difficult D.risky 33.TheunderlinedsentenceNatureisshrinkingbytheday.Tellsusthat. A.natureisbeingpollutedbyhumanbeings B.thenumberofspeciesarereducingdaybyday C.rainforestsarebeingcutdowneveryday D.naturewillbetotallydestroyedinafewdays 34.Whenitcomestobiodiversitythepresentproblemisthat. A.peoplemightnotknowexactlywhattodoforbiodiversity B.peoplearenotawarethatgiantpandasareendangered C.peopledon'trealizethatbiodiversityisvitaltoeverydaylife D.peoplehuntandboilseacreaturesforfood 35.WhatdoestheunderlinedwordItinparagraph5referto? A.TheUKgovernment. B.Theconceptofbiodiversity. C.Theactiontodealwiththeproblem. D.TheGuardiannewspaper.
设集合A={x∈R|x>2}B={x∈R|x2﹣3x≤0}则A∩B等于
已知xy满足不等式组则z=x+y的最大值等于
某校为了解学生对本校食堂的满意度随机抽取部分学生进行调查.根据学生的满意度评分得到如图所示的频率分布直方图其中a=若这次满意度评分的中位数为b根据频率分布直方图估计b65填“>”“<”或“=”
若直线的回归方程为=﹣2x+1当变量x增加一个单位时则下列说法中正确的是
双曲线=﹣1的渐近线方程是
如图边长为的正方形ABCD和高为1的等腰梯形BDEF所在的平面互相垂直EF∥BDAC与BD交于点O点H为线段OF上任意一点. Ⅰ求证OF∥平面ADE Ⅱ求BF与平面ADE所成角的正弦值 Ⅲ是否存在点H使平面BCH与平面ADE垂直若存在求出的值若不存在说明理由.
在△ABC中已知则∠C=.
在2+x5的展开式中x2的系数为.用数字作答
直线ly=kx+k与圆Cx﹣12+y2=1交于AB两点当△ABC的面积最大时k的值为.
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演讲比赛结束后4名选手与1名指导教师站成一排合影留念.要求指导教师不能站在两端那么有种不同的站法.用数字作答
10分文中共有10处语言错误每句中最多有两处错误.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1每处错误及其修改均仅限一词 2只允许修改10处多者从第11处起不计分 3格式对了才能得分! Inthecountrynowtherearemanychildrendonotattendtheschool.Ithinkoneofthereasonsisthattheirfamiliesareverypoortosendthemtoschool.Theyhadtostayathometomakemoneytosupporttheirfamilies.Otherreasonisthatmanyparentsthinkituselessofthegirlstostudyandtheydonotlikethemtogotoschool.Athirdreasoniswhatsomechildrenarenotinterestingintheirlessons.Inmyopinionallchildrenincludedgirlshavethechancetoreceiveeducation.Everybodyshouldpayattentionfortheeducationofthechildren.
已知椭圆的离心率为左顶点为A﹣20过椭圆C的右焦点F作互相垂直的两条直线l1l2分别交直线lx=4于MN两点AM交椭圆C于另一点P.Ⅰ求椭圆C的方程Ⅱ求证直线PN恒过定点并求出定点坐标.
某四棱锥的三视图如图所示在此四棱锥的侧面中面积最小的侧面面积为
已知向量=x2﹣1=24﹣2如果那么x等于
20分 MusictoMyEars Robbywas10forhisfirstpianolessoninmyclass.Muchashetriedhe46eventhebasicrhythm.HoweverhedutifullyreviewedthepiecesthatIrequired. OverthemonthshetriedandtriedwhileI47andencouragedhim.Attheendofeachlessonhe'dalwayssayMymom'sgoingtohearmeplaysomeday.48itseemedhopeless. Ionlyknewhismotherfroma49asshewaitedinheragedcartopickhimup.ThenonedayRobbystoppedcoming.Iwassecretly50thathestoppedbecauseofhislackofability. WeekslaterIinformedthestudentsofthecomingrecital独奏.Tomy51Robbyaskedmeifhecouldbeincluded.Itoldhimhereallydidnotqualifybecausehehad52out.Hesaidhismomhadbeensickandunabletotakehimtolessonsbuthewasstill53. I'vejustgottoplay!he54.Somethinginsidemeletmeallowhimto. Thencametherecitalnight.Thegymwas55withparents.IputRobbyup56thinkingthatIcouldsavehispoorperformancethroughmycurtaincloser谢幕. Therecitalwentoffsmoothly.ThenRobbycameuponstage.Hisclotheswerewrinkledandhishairwas57.Whydidn'thismotheratleastmakehimcombhishairforthisspecialnight?Ithought. Robbypulledoutthepianobenchandbegan.Iwasnot58forwhatIheardnext.Hisfingerswere59onthekeys.NeverhadIheardMozartplayedsowellbypeopleofhisage.Afterheendedeveryonewas60theirfeetinwildapplause. In61IranuponstageandputmyarmsaroundRobby.I'veneverheardyouplaylikethatRobby!Howdidyou62it? RobbyexplainedWellMissHondorf…rememberItoldyoumymomwassick?…63shehadcancerandpassedawayyesterday.Shewasborndeafsotonightshecouldhearmeplayinheaven.Iwantedtomakeitspecial. Therewasn'ta64eyeinthehouse.ThatnightIfelthewastheteacherandIwasthepupilforitwashewhotaughtmethemeaningofperseveranceand65. 46.A.lacked B.had C.showed D.got 47.A.listened B.learned C.checked D.played 48.A.And B.But C.So D.Or 49.A.conversation B.performance C.distance D.picture 50.A.guilty B.sad C.anxious D.glad 51.A.relief B.surprise C.pleasure D.satisfaction 52.A.stepped B.worn C.run D.dropped 53.A.acting B.performing C.practicing D.recording 54.A.insisted B.suggested C.complained D.threatened 55.A.lined B.packed C.piled D.covered 56.A.least B.most C.first D.last 57.A.messy B.cool C.neat D.dull 58.A.eager B.concerned C.prepared D.grateful 59.A.hesitating B.dancing C.touching D.crawling 60.A.over B.under C.in D.on 61.A.chaos B.tears C.silence D.return 62.A.find B.feel C.make D.like 63.A.Gradually B.Suddenly C.Frequently D.Actually 64.A.dry B.curious C.bright D.wet 65.A.regret B.talent C.love D.courage
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
已知表示共面的三个单位向量⊥那么+•+的取值范围是
抛物线x2=y的焦点到准线的距离为.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. ItisMother'sDaytoday.Thoughit'sawesternfestivalit'spopularinChinanow. Momhasafull﹣timejobsoshehastodomostofthehouseworks.Sheisagreatmother.BothDadorIplannedtodosomethingonMother'sDay.Wegetupearlyinthemorning.Dadcleanedthehouseandthenwentonshopping.WhenhecamebackIfoundabunchofflowersinherhand.IaskedMomtostayinthesittingroomandIcookedinkitchen.ThedisheswhatIcookedwereMom'sfavoritest.AtdinnerwesaidtoherHappyMother'sDay!Momwasgratefulandmoving.
8分Imaginelandinginaforeigncountrywhereyoucannotspeakthelanguageunderstandthecultureanddon'tknowanybody.Wouldn'titbenicetohaveafriendwhocouldhelpyouout? JohnSmithanEnglishexplorerwholandedinAmericain1607foundthebestfriendever.ShewasaNativeAmericannamedPocahontas1595﹣1617.AndshedidmorethanteachSmiththelanguageshesavedhislifetwice. SmithwascapturedbymembersofPocahontas'stribeandwasgoingtobekilled.ButforsomereasontheChief'sdaughterPocahontasfeltsorryforSmithwhowasprobablythefirstwhitemanshehadeverseenandthrewherbodyoverhistoprotecthim.Smithreturnedsafelytothesmallvillagehewaslivingin. DuringthewintertheEnglishsettlersdidnotknowhowtogetfoodfromnature.PocahontasoftenbroughtfoodforSmithandhisfriends. AyearlaterPocahontas'sfathertriedtokillSmithagainbecausetheNativeAmericanswereveryscaredtheEnglishwouldtrytotakeovertheirland.Pocahontaswarnedhimandhewasabletoescape. LatershebecameaChristianandeventuallymarriedanEnglishmannamedJohnRolfe. ShespentthelastyearofherlifeinLondon. PocahontashasbecomeanAmericanlegend.Herlifestoryhasbeenre﹣createdinmanybooksandfilmsincludingDisney's1995filmPocahontas. OneofthereasonssheissopopularisthatmanyEuropeanslookatPocahontasasanexcellentexampleofhowaminoritycanadjustintothemajority.Pocahontasisalsorespectedbecauseofherselflesslove.Sheprovedthatpeoplecanbekindandlovingeventopeopleofadifferentraceorculture.JohnSmithwasverydifferentfromPocahontasbutshecouldseehewasagoodmanandthatwasallthatmattered.Noraceorcountryownsgoodnessloveandloyalty. 24.WhatdifficultiesmightearlyEuropeansettlersmeetinAmericaEXCEPT? A.thefierceconflictwithNativeAmericans B.bad﹣temperednativeswhoenjoyedkilling C.unfamiliaritywithaforeignland D.lackoffoodinwinter 25.PocahontassavedJohnSmithtwicebecause. A.hewasthefirstwhitemanshehadeverseeninherlife B.shewantedtobecomeaChristianandmarryanEnglishman C.shebelievedingeneralkindnesseventopeopleofadifferentrace D.shewasonthesettlers'sideandagainsthercruelfather 26.WhichisNOTanelementtomakePocahontasalegend? A.Hertribalbackgroundandhermarriagetoawhitesettler. B.Herselflesshelptopeopleregardedasenemyofhertribe. C.Hercomplicatedlifestorydifferentfromcommonpeople's. D.Therecreationofherlifestoryinthe1995Disneyfilm. 27.Whatcanweinferfromthepassage? A.ThereweremanyconflictsbetweenearlysettlersandNativeAmericans. B.TheEuropeansthinktheearlysettlersshouldhavelearnedtoadjusttothelocalcultures. C.ThecreationofAmericaisbasedonthesettlers'victoryovertheNativeAmericans. D.Peoplefromdifferentculturescanneverreallygetalongwellwitheachother.
设集合A={x|x2﹣4x+3<0}B={x|2x﹣3>0}则A∩B=
已知命题p∃x∈Rx2﹣1>0那么¬p是
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