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如图所示,质量不等的A、B两个物块,以大小相同的初速度在水平面上同时相向运动,结果两个物体同时到达它们最初位置连线的中点.下列说法正确的是( )
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高三下学期物理《》真题及答案
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如图所示两个宽度为d的有界磁场区域磁感应强度都为B.方向如图18所示不考虑左右磁场相互影响且有理想边
如图所示在光滑的水平面上有一质量为M.的长木板长木板左端放一质量为mM>m的物块现同时给长木板和物块
如图所示物块质量m=0.5kg可看作质点它与木板之间动摩擦因数μ1=0.5.长L=3m质量M=2kg
如图所示某人在对面的山坡上水平抛出两个质量不等的小石块分别落在
B.两处.不计空气阻力,则落到A.处的石块
A.初速度大,运动时间短
初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
如图所示质量为M.的长木板静止放置在粗糙水平地面上有一个质量为m可视为质点的物块以某一水平初速度从左
10分两个完全相同的物块A.B.质量均为m=0.8kg在同一粗糙水平面上以相同的初速度从同一位置开始
如图所示两个完全相同的小球
B.,在同一高度处以相同大小的初速度v
0
分别水平抛出和竖直向上抛出,忽略空气阻力,下列说法正确的是( ) A.两小球落地时速度的大小相同
两小球落地时,重力的瞬时功率相同
从开始运动至落地,重力对两小球做功相同
从开始运动至落地,重力对两小球做功的平均功率相同
如图所示两个完全相同的小球
B.,在同一高度处以相同大小的初速度v
0
分别水平抛出和竖直向上抛出,则( ) A.两小球落地时的速度相同
两小球落地时,重力的瞬时功率相同
从开始运动至落地,重力对两小球做功相同
从开始运动至落地,重力对两小球做功的平均功率相同
16分两个完全相同的物块A.B.质量均为m=0.8kg在同一粗糙水平面上以相同的初速度从同一位置开始
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B两处.不计空气阻力,则落到B处的石块 A.初速度大,运动时间短
初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B.两处.不计空气阻力,则落到
处的石块( ) A.初速度大,运动时间短B.初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
两个内壁光滑半径不同的半球形碗放在不同高度的水平面上使两碗口处于同一水平面如图所示现将质量相同的两个
两小球速度大小不等,对碗底的压力相等
两小球速度大小不等,对碗底的压力不等
两小球速度大小相等,对碗底的压力相等
两小球速度大小相等,对碗底的压力不等
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B.两处.不计空气阻力,则落到
处的石块 A.初速度大,运动时间短 B.初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B.两处。不计空气阻力,则落到
处的石块( )
A.初速度大,运动时间短B.初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
如图所示在光滑的水平面上有一质量为M.的长木板长木板左端放一质量为mM>m的物块现同时给长木板和物块
如图所示一块足够长的木板C.质量为2m放在光滑的水平面上在木板上自左向右放有A.B.两个完全相同的炭
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B.两处.不计空气阻力,则落到
处的石块( ) A.初速度大,运动时间短 B.初速度大,运动时间长
初速度小,运动时间短
初速度小,运动时间长
如图所示某人向对面的山坡上水平抛出两个质量不等的石块分别落到
B.两处。不计空气阻力,则落到
处的石块( ) A.初速度大,运动时间长 B.初速度大,运动时间短
初速度小,运动时间长
初速度小,运动时间短
两个完全相同的物块A.B.质量均为m=0.8kg沿同一粗糙水平面以相同的初速度从同一位置运动利用速度
16分两个完全相同的物块A.B.质量均为m=0.8kg在同一粗糙水平面上以相同的初速度从同一位置开始
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FreedomandResponsibility Freedom'schallengeintheDigitalAgeisaserioustopic.Wearefacingtodayastrangenewworldandweareallwonderingwhatwearegoingtodowithit. Some2500yearsagoGreecediscoveredfreedom.Beforethattherewasnofreedom.Thereweregreatcivilizationssplendidempiresbutnofreedomanywhere.EgyptandBabylonwerebothtyranniesoneverypowerfulmanrulingoverhelplessmasses. InGreeceinAthens雅典alittlecityinalittlecountrytherewerenohelplessmasses.AndAthenianswillinglyobeyedthewrittenlawswhichtheythemselvespassedandtheunwrittenwhichmustbeobeyediffreemenlivetogether.Theymustshoweachotherkindnessandpityandthemanyqualitieswithoutwhichlifewouldbeverypainfulunlessonechosetolivealoneinthedesert.TheAtheniansneverthoughtthatamanwasfreeifhecoulddowhathewanted.Amanwasfreeifhewasself﹣controlled.Tomakeyourselfobeywhatyouapprovedwasfreedom.Theyweresavedfromlookingattheirlivesastheirownprivateaffair.EachonefeltresponsibleforthewelfareofAthensnotbecauseitwasforcedonhimfromtheoutsidebutbecausethecitywashisprideandhissafety.Theessentialbeliefofthefirstfreegovernmentintheworldwaslibertyforallmenwhocouldcontrolthemselvesandwouldtakeresponsibilityforthestate. Butdiscoveringfreedomisnotlikediscoveringcomputers.Itcannotbediscoveredonceforall.Ifpeopledonotprizeitandworkforititwillgo.Constantwatchisitsprice.Athenschanged.Itwasachangethattookplacewithoutbeingnoticedthoughitwasoftheextremeimportanceaspiritualchangewhichaffectedthewholestate.IthadbeentheAtheniansprideandjoytogivetotheircity.Thattheycouldgetmaterialbenefitsfromherneverenteredtheirminds.Therehadtobeacompletechangeofattitudebeforetheycouldlookatthecityasanemployerwhopaidhercitizensfordoingherwork.Nowinsteadofmengivingtothestatethestatewastogivetothem.Whatthepeoplewantedwasagovernmentwhichwouldprovideacomfortablelifeforthemandwiththisastheprimaryobjectideasoffreedomandself﹣relianceandresponsibilitywereneglectedtothepointofdisappearing.Athenswasmoreandmorelookedonasacooperativebusinesspossessedofgreatwealthinwhichallcitizenshadarighttoshare. Athensreachedthepointwhenthefreedomshereallywantedwasfreedomfromresponsibility.Therecouldbeonlyoneresult.Ifmeninsistedonbeingfreefromtheburdenofself﹣dependenceandresponsibilityforthecommongoodtheywouldceasetobefree.Responsibilityisthepriceeverymanmustpayforfreedom.Itistobehadonnootherterms.AthenstheAthensofAncientGreecerefusedresponsibilityshereachedtheendoffreedomandwasnevertohaveitagain. ButtheexcellentbecomesthepermanentAristotlesaid.Athenslostfreedomforeverbutfreedomwasnotlostforeverfortheworld.AgreatAmericanJamesMadisonreferredtoThecapacity能力ofmankindforself﹣government.NodoubthehadnotanideathathewasspeakingGreek.Athenswasnotinthefarthestbackgroundofhismindbutoncemanhasagreatandgoodideaitisnevercompletelylost.TheDigitalAgecannotdestroyit.Somehowinthisorthatman'sthoughtsuchanidealivesthoughunconsideredbytheworldofaction.Onecanneverbesurethatitisnotonthepointofbreakingoutintoactiononlysurethatitwilldososometime. 65.WhatdoestheunderlinedwordtyranniesinParagraph2referto? A.Countrieswheretheirpeopleneedhelp. B.Powerfulstateswithhighercivilization. C.Splendidempireswherepeopleenjoyfreedom. D.Governmentsruledwithabsolutepower. 66.Peoplebelievinginfreedomarethosewho. A.regardtheirlifeastheirownbusiness B.seekgainsastheirprimaryobject C.behavewithinthelawsandvaluesystems D.treatotherswithkindnessandpity 67.WhatchangeinattitudetookplaceinAthens? A.TheAtheniansrefusedtotaketheirresponsibility. B.TheAtheniansnolongertookprideinthecity. C.TheAtheniansbenefitedspirituallyfromthegovernment. D.TheAthenianslookedonthegovernmentasabusiness. 68.WhatdoesthesentenceTherecouldbeonlyoneresult.inParagraph5mean? A.Athenswouldcontinuetobefree. B.Athenswouldceasetohavefreedom. C.Freedomwouldcomefromresponsibility. D.FreedomwouldstopAthensfromself﹣dependence. 69.WhydoestheauthorrefertoAristotleandMadison? A.Theauthorishopefulaboutfreedom. B.Theauthoriscautiousaboutself﹣government. C.TheauthorisskepticalofGreekcivilization. D.Theauthorisproudofman'scapacity. 70.Whatistheauthor'sunderstandingoffreedom? A.Freedomcanbemorepopularinthedigitalage. B.Freedommaycometoanendinthedigitalage. C.Freedomshouldhavepriorityoverresponsibility. D.Freedomneedstobeguaranteedbyresponsibility.
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AskhelpfulHannah DearhelpfulHannah I'vegotaproblemwithmyhusbandSam.HeboughtasmartphoneacoupleofmonthsagoandhetookitonourrecentskivacationtoColoradoitwasagreattripexceptforoneproblem.Hehasaconstanturge33checkfornextmessageshecheckshisphoneeveryfiveminutes!He'ssoaddictedtoitthathejustcan'tstandtheidea34theremaybeanimportanttext.Hecan'thelpcheckingevenatinappropriatetimeslikewhenweareeatinginarestaurantandIamtalkingtohim!Hebehaves35anysmallamountofboredomcanmakehimfeeltheneedtocheckhisphoneevenwhenheknowheshouldn't.Thetemptationtosee36isconnectinghimisjusttoogreat.WhenIaskhimtoputdownthephoneandstop37ignoremehesayInaminute.butstillcheckstoseeif38haspostedsomethingnewontheInternet.Ourlife39interrupt.IfwegosomewhereandIaskhimtohavethephoneathomehesuffersfromwithdrawalsymptom.Maythisdependencyonhissmartphonehasbecomemorethananeverydayproblem. Irecentlyreadanarticleaboutnomophobia40isarealillnesspeoplecan'tsufferfromthefearofbeingwithoutyourphone!IamworriedthatSammaybesufferingfromthisillnessbecausehefeelsanxiousifhedoesn'thavehisphonewithhimevenforashorttime. Whowouldhavethoughtthatlittledeviceslikethesecouldhavebroughtsomuchtrouble! SickandTiredSadie. 33. 34. 35. 36. 37. 38. 39. 40.
已知函数gx=alnx. 1设hx=fx+gx证明当m>n>0a≥1时hm+2n>hn+2m 2若在[1e]上存在一点x0使得成立求实数a的取值范围.
学校即将举办读书节目前正广泛征集读书节宣传册图片.假设你是该校学生潘阳你已找到以下三幅图片决定给读书节组委会写一封信推荐其中一幅你的信须包括以下内容 1.简单描述你想推荐的那幅图片 2.阐述你用这幅图片宣传读书节的理由.
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Ifyoustudiedpicturesthatancientpeopleleftonrockwallsandyoutriedtodeterminetheirmeaningyouwouldnotdetectinterestinromanceamongtheartists.51youwouldseeplentyofanimalswithpeoplerunningafterthem.Lifeforancientpeople'searnedtocenteronhuntingandgatheringwildfoodsformeals. Inmoderntimeswhenfoodisavailableingrocerystoresfindingloveismore52inpeople'slives.The53isallaroundus.Itiseasytopreparealistofmodernstorieshavingtodowithlove.Anendlessnumberofbooksandmoviesqualifyaslovestoriesinpopularculture. Researchersarestudyingwhetherloveahighlyvaluedemotionalstatecanbe54.Theyaskwhatislove?Toothpastecompanieswantustothinkattractionisallaboutcleanteethbutcleanteethgoonlysofar.Scientistswonderhowmuchthebraingetsinvolved.Youhaveprobablyheardthatoppositesattractbutthat55attracttoo.OnethingiscertainThetruthaboutloveisnotyetsetinstone. FirstImpression Tohelpdeterminethe56ofattractionresearcherspaired164collegeclassmatesandhadthemtalkfor36or10minutessotheycouldgetasenseofeachother'sindividuality.Thenstudentswereaskedto57whatkindofrelationshiptheywerelikelytobuildwiththeirpartners.Afternineweekstheyreportedwhathappened. Asitturnedouttheir58judgementsoftenheldtrue.Studentsseemedto59atanearlystagewhowouldbestfitintotheirlives. The60Knows Scientistshavealsoturnedtononhumanstoincreaseunderstandingofattraction.Manyanimalsgiveoffpheromones﹣naturalchemicalsthatcanbedetectedbyandthencanproducearesponseinotheranimalsofthesamespecies.Pheromonescansignalthatananimaliseitherreadytofightorisfeeling61topartnerships.Incontrasthumansdonotseemtobeas62asotheranimalsatdetectingsuchchemicals.Smellhoweverdoesseemtoplayapartinhumanattraction.Althoughwemaynotbeawareofchemicalslikepheromonesconsciouslywegiveandreceiveloadsofinformationthroughsmellineveryinteractionwithotherpeople. FaceValue Beingfondofsomeoneseemstohaveanumberoffactorsincludingseeingsomethingwefindattractive.Researchershadpeoplejudgefacesfor63.Theparticipantshad0.013secondstovieweachfaceyetsomehowtheygenerallyconsideredtheimagesthesameaspeoplewhohadmoretimetostudythesamefaces.Thewaywe64attractivenessseemtobesomewhatautomatic. Whenshownanattractivefaceandthenwordswithgoodorbadassociationspeoplerespondedto65wordsfasterafterviewinganattractiveface.Seeingsomethingattractiveseemstocausehappythinking. 51.A.Instead B.Therefore C.Moreover D.Otherwise 52.A.romantic B.stressful C.central D.beneficial 53.A.priority B.proof C.possibility D.principle 54.A.tested B.imposed C.changed D.created 55.A.appearances B.virtues C.similarities D.passions 56.A.illustrations B.imaginations C.ingredients D.instructions 57.A.predict B.investigate C.diagnose D.recall 58.A.critical B.initial C.random D.mature 59.A.memorize B.distinguish C.negotiate D.question 60.A.Nose B.Eye C.Heart D.Hand 61.A.open B.alert C.resistant D.superior 62.A.disappointed B.amazed C.confused D.gifted 63.A.emotion B.attractiveness C.individuality D.signals 64.A.enhance B.possess C.maintain D.assess 65.A.familiar B.plain C.positive D.insulting.
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70.InthefilmreviewwhatisparagraphAmainlyabout?. A.Theintroductiontotheleadingroles B.Thewriter'sopinionofacting C.Thewriter'scommentsonthestory D.Thebackgroundinformation 71.AccordingtothefilmreviewmonsterparagraphBrefersto. A.agun﹣crazyhunter B.abrainydog C.ascaryrabbit D.agiantvegetable 72.Whichofthefollowingisareasonwhythewriterrecommendsthefilm? A.It'sfullofwitandhumour. B.Itscharactersshowfeelingswithoutwords. C.ItisanadventurefilmdirectedbyPeterSallis. D.Itisabouttheharmonybetweenmanandanimals.
IwasrequiredtoreadoneofBernieSiegel'sbooksincollegeandwashookedonhispositivityfromthatmomenton.Thestoriesofhisunconventional36andtheexceptionalpatientshewroteaboutwereso37tomeandhadsuchabig38onhowIsawlifefromthenon.WhoknewthatsomanyyearslaterIwouldlooktoDr.BernieandhisCDsagainto39myowncancerexperience? I'manambitious40andwhenIstartedgoingthroughchemo化疗eventhoughI'mavery41personIlostmydrivetowrite.Iwasjusttootiredandnotinthe42.Onedaywhilewaitingtogoinfor43IhadoneofDr.Bernie'sbooksinmyhand.Anotherpatient44whatIwasreadingandstruckupaconversationwithme45hehadoneofhisbookswithhimaswell.It46thatamongotherthingshewasaneighty﹣year﹣oldwriter.Hewas47apublishedauthorandhewascurrently48onanewbook. Wewouldseeeachotheratvarioustimesand49friends.SometimesheworeaduckhatandIwouldtellmyselfhewasdefinitelyan50ofDr.Bernie.Hereallyputa51onmyface.Heunfortunately52lastyearduetohiscancer53heleftadeepimpressiononmeandgavemethe54topickupmypenagain.I55tomyselfIfhecandoitthensocanI. 36.A.tastes B.ideas C.notes D.memories 37.A.amazing B.shocking C.amusing D.strange 38.A.strike B.push C.challenge D.impact 39.A.learnfrom B.goover C.getthrough D.referto 40.A.reader B.writer C.editor D.doctor 41.A.positive B.agreeable C.humorous D.honest 42.A.mood B.position C.state D.way 43.A.advice B.reference C.protection D.treatment 44.A.viewed B.knew C.noticed D.wondered 45.A.while B.because C.although D.providing 46.A.cameout B.workedout C.provedout D.turnedout 47.A.naturally B.merely C.hopefully D.actually 48.A.deciding B.investing C.working D.relying 49.A.became B.helped C.missed D.visited 50.A.patient B.operator C.fan D.publisher 51.A.sign B.smile C.mark D.mask 52.A.showedup B.setoff C.felldown D.passedaway 53.A.since B.but C.so D.for 54.A.guidance B.trust C.opportunity D.inspiration 55.A.promised B.swore C.thought D.replied
Someschoolswillhavetomakeinagreementwiththenationalsoccerreform. A.judgments B.adjustments C.comments D.achievements
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ManyofthethingswenowbenefitfromwouldnotbearoundThomasEdison. A.thanksto B.regardlessof C.asidefrom D.butfor
Itmighthavesavedmesometroubletheschedule. A.didIknow B.haveIknown C.doIknow D.hadIknown
Youthsporthasthepotentialtoaccomplishthreeimportantobjectivesinchildren'sdevelopment.Firstsportprogramscanprovideyouthwithopportunitiestobephysicallyactivewhichcanleadtoimprovedphysicalhealth.Secondyouthsportprogramshavelongbeenconsideredimportanttoyouth'spsychosocialdevelopmentprovidingopportunitiestolearnimportantlifeskillssuchascooperationdisciplineleadershipandself﹣control.Thirdyouthsportprogramsarecriticalforthelearningofmotorskillsthesemotorskillsserveasafoundationforfuturenationalsportstarsandrecreationaladultsportparticipants.Whencoachersdevelopactivitiesforyouthpracticesandwhensportorganizationsdesignyouth﹣sportprogramstheymustconsidertheimplicationofdeliberateplayanddeliberatepractice. ResearchfromTelama2006statesthatregularparticipationindeliberateplayordeliberatepracticeactivitiesduringchildhoodandyouthagesninetoeighteenincreasesthelikelihoodofparticipationinsportsduringadulthoodbysixtimesforbothmalesandfemales.Côté2002definesdeliberateplayactivitiesinsportasthosedesignedtomaximizeenjoyment.Theseactivitiesareregulatedbyflexiblerulesadaptedfromstandardizedsportrulesandaresetupbythechildrenorbyaninvolvedadult.Childrentypicallychangerulestofindapointwheretheirgameissimilartotheactualsportbutstillallowsforplayattheirlevel.Forexamplechildrenmaychangesoccerandbasketballrulestosuittheirneedsandenvironmente.g.inthestreet.onaplayingfieldorinsomeone'sbackyard.Wheninvolvedindeliberateplayactivitieschildrenarelessconcernedwiththeoutcomeoftheiroutcomeoftheirbehavior.whethertheywinorlosethanwiththebehavior.havingfun. OntheotherhandEricsson1993suggeststhatthemosteffectivelearningoccursthroughinvolvementinhighlystructuredactivitiesdefinedasdeliberatepractice.Deliberatepracticeactivitiesrequireeffortproducenoimmediaterewardsandaremotivatedbythegoalofimprovingperformanceratherthanthegoalofenjoyment.Whenindividualsareinvolvedindeliberateplaytheyexperimentwithdifferentcombinationsofbehaviorsbutnotnecessarilyinthemosteffectivewaytoimproveperformance.Incontrastwhenindividualsareinvolvedindeliberatepracticetheyexhibitbehavior.focusedonimprovingperformancebythemosteffectivemeansavailable.Forexamplethebackhandskillsintenniscouldbelearnedandimprovedovertimebyplayingmatchesorbycreatingfunpracticesituations.Howeverplayerscouldmoreeffectivelyimprovetheirbackhandperformancebypracticingdrillsthatmightbeconsideredlessenjoyable.Althoughdrillsareusedinmosteffectivemeansavailablepracticemightnotbethemostenjoyabletheymightbethemostrelevanttoimprovingperformance. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTENWORDS 78.Besidesthelearningofmotorskillswhataretheothertwoimportantobjectivesofyouthsport?. 79.Ifchildrenparticipateindeliberateplayordeliberatepracticeactivitiestheyaremorelikelyto. 80.Indeliberateplayactivitieswhatdochildrendotomaximizeenjoyment?. 81.Incontrasttodeliberateplaydeliberatepracticeisaimedat.
Itissocoldthatyoucan'tgooutsidefullycoveredinthickclothes. A.if B.unless C.once D.when
某单位共有10名员工他们某年的收入如表 1求该单位员工当年年薪的平均值和中位数 2从该单位中任取2人此2人中年薪收入高于7万的人数记为ξ求ξ的分布列和期望 3已知员工年薪收入与工作年限成正相关关系某员工工作第一年至第四年的年薪分别为4万元5.5万元6万元8.5万元预测该员工第五年的年薪为多少 附线性回归方程中系数计算公式分别为其中为样本均值.
Therealreasonwhypricesandstillaretoohighiscomplexandnoshortdiscussioncansatisfactorilyexplainthisproblem. A.Were B.willbe C.havebeen D.hadbeen
加压或降温可将氧气变成液氧下列说法正确的是
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