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如图所示，质量为m的木块在放置于水平面上的木板上滑行，木板静止，木块与木板、木板与桌面之间的动摩擦因数分别为μ和2μ，木板的质量为2m，则木板所受桌面给的摩擦力大小为（ ）
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高三下学期物理《》真题及答案
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如图所示质量为m的小木块A以水平初速v0冲上质量为M长为L置于光滑水平面上的木板B上A.B间动摩擦因
如图所示质量为2m的木板静止放在光滑的水平面上木板左端固定着一根轻质弹簧一质量为m的小木块大小不计从
如图所示质量为m1=2kg的木板A放在水平面上木板与水平面间的动摩擦因数为μ1=0.1木板在F=7N
如图所示一质量为M.的木板静止在光滑的水平面上质量为m的滑块以速度v水平滑上木板左端滑块与木板共速时
如图所示质量为m的木块在水平面上的木板上向左滑行滑行时木板静止木板质量M＝3m已知木块与木板间木板
4μmg
3μmg
2μmg
μmg
如图所示质量M=2kg的一定长度的长木板静止在光滑水平面上在其左端放置一质量m=1kg的小木块可视为
滑出瞬间,小木块的速度为2 m/s
滑出瞬间,小木块的速度为4 m/s
滑出瞬间,长木板的速度为2 m/s
滑出瞬间,长木板的速度为4 m/s
如图所示质量为m的物块在置于水平面上的木板上滑行木板始终静止物块与木板木板与桌面间的动摩擦因数均为μ
μmg
2μmg
3μmg
4μmg
如图所示质量为3m的木板C放在水平面上木板与地面的摩擦不计在木板的上面有两块质量均为m的小木块A和B
如图所示有一长木板b紧靠在如图所示的墙角其上表面与放置木块a的平台处于同一水平面上已知木块a的质量m
如图所示质量为m的木块在质量为M.的长木板上滑行长木板与水平面间动摩擦因数为μ1木块与长木板间动摩擦
μ
1
(M.+ m)g
μ
2
mg
μ
1
M. g
μ
2
mg +μ
1
M. g
如图所示将一质量为3m的长木板静止地放在水平面上另一质量为m的木块以水平初速度v0滑上长木板若木块与
μmg
2μmg
3μmg
4μmg
如图所示有一长木板b紧靠在如图所示的墙角其上表面与放置木块a的平台处于同一水平面上已知木块a的质量m
如图所示质量为m的木块在水平面上的木板上向左滑行滑行时木板静止木板质量M＝3m已知木块与木板间木板
4μmg
3μmg
2μmg
μmg
如图所示在光滑的水平面上静置一块质量为M＝500g的木板木块和木板间动摩擦因数μ＝0.2在木板左侧有
如图所示在光滑的水平面上放着质量为M.的木板在木板的左端有一个质量为m的木块在木块上施加一个水平向右
若仅增大木板的质量M.，则时间t增大
若仅增大木块的质量m，则时间t增大
若仅增大恒力F.，则时间t增大
若仅增大木块与木板间的动摩擦因数，则时间t增大
如图所示一质量为M长为L的木板固定在光滑水平面上一质量为m的小滑块以水平速度v0从木板的左端开始滑动
如图所示一质量为M.长为L.的木板固定在光滑水平面上一质量为m的小滑块以水平速度v0从木板的左端开始
在光滑的水平面上放置着质量为M.的木板在木板的左端有一质量为m的木块在木块上施加一水平向右的恒力F.
若仅增大木板的质量M.，则时间t增大
若仅增大木块的质量m，则时间t增大
若仅增大恒力F.，则时间t增大
若仅增大木块与木板间的动摩擦因数为μ，则时间t增大
如图所示一质最为M.的长木板静板置于光滑水平面上其上放置质量为m的小滑块木板受到随时间t变化的水平拉
滑块的质量m=4kg
木板的质量 M=6kg
当F.=8N时滑块加速度为2 m/s2
滑块与木板间动摩擦因数为0.1
如图所示将一质量为3m的长木板静止地放在水平面上另一质量为m的木块以水平初速度v0滑上长木板若木块与
μmg
2μmg
3μmg
4μmg
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Peopledohavedifferentideasaboutwhat1wear.Whileyoungpeopletendtoconsidermoreaboutfashionpersonalityandhowtheylookwhen2chooseclotheselderlypeoplepay3greatattentiontowhethertheyappearrighttheyfeelcomfortableaswellaswhetherthematerialisworth4price.Howpeoplegetdressedalsochangesovertime.TakeChina5anexample.Inthe1960'sand1970'stherewerepracticallyonlytwoorthreecolorspeoplewore﹣bluegreenandgray.Thestylesoftheclothes6bealsoverydull.Inthe1980'syoungpeoplewouldonlywear7wasinfashion.8recentwehavecometounderstandthatthewayyoudress9youisareflectionofyouroccupationyourbackgroundandyourpersonality.Soweseedifferentpeopleweardifferentclothesaccordingtooccasionstheirlikesand10feel.
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WhenIwasyoungmyfatherhadoneofthefirsttelephonesmourneighborhood.Iremembertheshinyboxonthewall.ButIwastoolittletoreachit.Icouldonlylistentomymothertalkonit.Idiscoveredthatinsidethe﹣wonderfulboxlivedanamazingpersonwhosenamewasInformationPlease.Therewasnothingshedidnotknow.Onedaymymotherwentout.IaccidentallyhurtmyfingerwhenIwasplayingwithahammer.Iwalkedaroundthehousesuckingmyfingerfinallyseeingthetelephone.QuicklyIdraggedachairoverandclimbedup.'InformationPlease'Ispokeintothereceiver.Aclickortwoandasmallclearvoicespokeintomyear.'Information.''Ihurtmyfinger'Icriedintothephone.'Isn'tyourmotherhome?'camethequestion.'Nobody'shomebutme.'Isobbed.'Areyoubleeding?'thevoiceasked.'No'Ireplied'Ihitmyfingerwiththehammerandithurts.''Canyouopenyouricebox?'sheasked.IsaidIcould.'Thentakealittlepieceoficeandholdittoyourfinger.'saidthevoice.AfterthatIcalled'InformationPlease'foreverything.IaskedherforhelpwithmygeographyandshetoldmewherePhiladelphiawas.Shehelpedmewithmymath.ShetoldmehernamewasSally.Thentherewasthetimemypetcanary金丝雀died.Icalled'InformationPlease'andtoldSallythesadstory.'Whyisitthatbirdssingsobeautifullyandbringjoytoallfamiliesonlytoendupasapileoffeathers?'Shelistenedthensaidquietly'Paulalwaysrememberthatthereareotherworldstosingin.'SomehowIfeltbetter.OnedaywhenIcalled'InformationPlease'againadifferentvoiceanswered'Information.'IaskedforSally.'Areyouafriend?'shesaid.'Yes'Ianswered.'I'msorrytohavetotellyouthis'shesaid.'Shediedfivedaysago.'BeforeIcouldhangupshesaid'Waitaminute.DidyousayyournamewasPaul?''Yes.''WellSallyleftamessageforyou.Thenotesaid‘TellhimIstillsaythereareotherworldstosingin.He'llknowwhatImean.''Ithankedherandhungup.IknewwhatSallymeant.1.Whentheauthorhurthisfingerherangbecause.A.hebelievedthatthetelephonekneweverythingB.thetelephonecouldtellhimadoctor'snumberC.hismotherwasontheotherendofthetelephoneD.hewasoncetoldtoaskforhelpinthisway2.ThroughthehelpfromSallyitcanbeinferredthat.A.SallywasageographyteacherB.Sallywastheauthor'sfriendC.SallywasaconsideratepersonD.Sallywasanimaginaryperson3.WhatdidSallyreallymeanbyhermessage?A.Shewassurethatshecouldsinginotherworlds.B.Shedidn'twantPaultobesadaboutherdeath.C.SinginghelpedPaultofacedeathmoreeasily.D.TherewasnoneedforPaultocallheranymore.4.Whatisthebesttitleforthispassage?A.MyPet'sDeathB.AnAmazingWomanC.AHealingMessageD.MyMagicBox
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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.作文中共有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.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. RecentlywehavehadadiscussionaboutthatChinashouldmakeeveryefforttodevelopingcarindustry.Opinionsdividedonthequestion. 60%ofthestudentsholdthebeliefthatChinashouldfulldevelopcarindustry.Itwillnotonlypromoteeconomicdevelopmentbutprovidesmorejobstoworkersaswell.Besidecarscanhelptosavetimeandimprovepeople'slifequality.Ontheotherhand40%thinkChinashouldlimittheircarindustrydevelopment.Otherwisethecitytrafficwillbemuchmoreheavierandmoretrafficaccidentwilloccur.Asaresultnewroadswillbebuiltbutoccupymorefarmland.
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抛物线y2＝4x的焦点坐标是
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Advancesinhealtheducationanddiseasepreventionandtreatmentsaremakinghumanlifelonger.Butwhatyoumaynotknowisthatsomeseeminglyunimportantthingscanalsoinfluencehowlongandhowwellyou'lllive.Hereisthelatestresearchonlongevitysigns.Sign1:YourMomHadYouYoungIfshewasunderage25you'retwiceaslikelytoliveto100assomeoneborntoanoldermom.Theythinkthatyoungermomsproducehealthierbabies.Sign2:You'reaTeaLoverBothgreenteaandblackteacontaincatechins儿茶酚somethingthathelpsbloodvessels血管relaxandprotectsyourheart.Sign3:You'dRatherWalk'Fit'people﹣definedasthosewhowalkforabout30minutesaday﹣aremorelikelytolivelongerthanthosewhowalkless.Sotakeawalkduringyourlunchhourdoexercisearoundthefieldwhileyourkidisatsoccerpractice﹣trybyhookorbycrooktomovealittlemoreeveryday.Sign4:YouHaveStrongLegsLower﹣bodystrengthtranslatesintogoodbalanceflexibilityandpowerwhichasyougetolderplayanimportantpartinreducingyourriskoffallsandinjuriesleadingtobetterhealth.Nowyouseeitisnecessarytostrengthenyourlower﹣body.Butthequestionis:how?1.WhichofthefollowingisTRUE?A.Greenteacontainsmorecatechinsthanblacktea.B.Generallytheyoungerthemomsthehealthierthebabies.C.Themoreyouwalkthelongeryoulive.D.Low﹣bodystrengthisthemostimportantfactorforlongevity.2.Theunderlinedphraseisclosestinmeaningto''.A.tryanypossiblemeansB.usesometoolsC.choosecarefullyD.Workoutnewways3.Accordingtothetextyourlongevityisaffectedbythingssuchas.a.lower﹣bodystrengthb.diseasetreatmentsc.yourmom'saged.livinghabitsA.abcB.acdC.abdD.bcd4.Whatisthepassagemainlyabout?A.Howadvancedsciencehelpspeoplelivelonger.B.Howwomengivebirthtohealthybabies.C.Signsthattellyouyourhealthcondition.D.Thenewdiscoveriesoflongevitysigns.
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变量xy之间的一组相关数据如表所示 若xy之间的线性回归方程为＝x+12.28则的值为
若函数为奇函数则实数a＝．
若则|z|＝
在等比数列{an}中“a4a12是方程x2+3x+1＝0的两根”是“＝1”的
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已知函数fx＝sin2ωx+cos2ωx+bω＞0的一条对称轴为且最高点的纵坐标是． 1求ω的最小值及此时函数fx的最小正周期初相 2在1的情况下设求函数gx在上的最大值和最小值．
函数fx＝sinωx+φω＞0|φ|＜的部分图象如图所示将y＝fx的图象向右平移个单位长度后得到函数y＝gx的图象． 1求函数y＝gx的解析式 2在△ABC中角ABC满足2sin2＝gC++1且其外接圆的半径R＝2求△ABC的面积的最大值．
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