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如图所示，光滑圆柱半径为R，被固定在水平平台上，用轻绳跨过圆柱体与两小球m1、m2相连（m1、m2分别为它们的质量），开始时让m1放在平台上，两边绳绷直，两球从静止开始m1上升，m2下降．当m1上升...
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高三下学期物理《》真题及答案
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半径为R.的表面光滑的半球固定在水平面上在距其最高点的正上方为h的悬点O.固定长L.的轻绳一端绳的另
半径为R.的光滑球固定在水平桌面上有一质量为M.的圆环状均匀弹性绳圈原长为πR且弹性绳圈的劲度系数为
如图所示用轻绳一端固定在A.点另一端B.点系重力G.＝120N的物体C.是表面光滑的固定圆柱体则绳对
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B.用不可伸长的细软轻线连接，跨过固定在地面上、半径为R.的光滑圆柱，A.的质量为
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如图所示一光滑半圆形碗固定在水平面上质量为m1的小球用轻绳跨过碗口并连接质量分别为m2和m3的物体平
5∶4∶3
4∶3∶5
3∶4∶5
5∶3∶4
长为l的轻绳一段固定在光滑水平面上o处另一端系带正电的小球水平面内有垂直向下的匀强磁场小球在光滑水
r＞l，T'＞T
r＜l，T'＜T
r＞l，T'＜T
r＜l，T'＞T
如图所示可视为质点的小球
B.用不可伸长的细软轻线连接，跨过固定在地面上半径为R.的光滑圆柱，A.的质量为
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B.
如图所示半径为R.的光滑圆柱体被固定在水平平台上圆柱体中心离台边水平距离为0.5R质量为m1的小球用
如图可视为质点的小球AB用不可伸长的细软轻线连接跨过固定在地面上半径为R的光滑圆柱A的质量为B的两倍
2R
5R/3
4R/3
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如图所示半径为R.圆心角为60°的光滑圆弧槽固定在高为h的平台上小物块从圆弧槽的最高点
静止开始滑下，滑出槽口
时速度水平向左，小物块落在地面上
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2
点为圆心的圆弧上，O.
2
在B.点正下方地面上，则( )
A.4R.＝h B.2R.＝h C.R.＝h
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如图所示轻绳一端系一质量为m的小球另一端做成一个绳圈套在固定的图钉A和B上此时小球在光滑的水平平台上
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θ
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）4R./3 （
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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.
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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.
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已知函数fx＝|x﹣3|． Ⅰ若不等式fx﹣1+fx＜a的解集为空集求实数a的取值范围 Ⅱ若|a|＜1|b|＜3且a≠0判断与的大小并说明理由．
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IntheUnitedStatesaloneover100millioncell﹣phonesarethrownawayeachyear.Cell﹣phonesarepartofagrowingmountainofelectronicwastelikecomputersandpersonaldigitalassistants.Theelectronicwastestreamisincreasingthreetimesfasterthantraditionalgarbageasawhole. Electronicdevicescontainvaluablemetalssuchasgoldandsilver.ASwissstudyreportedthatwhiletheweightofelectronicgoodsrepresentedbypreciousmetalswasrelativelysmallincomparisontototalwastetheconcentration含量ofgoldandotherpreciousmetalswashigherinSo﹣callede﹣wastethaninnaturallyoccurringminerals. Electronicwastesalsocontainmanypoisonousmetals.Evenwhenthemachinesarerecycledandtheharmfulmetalsremovedtherecyclingprocessofteniscarriedoutinpoorcountriesinpracticallyuncontrolledwayswhichallowmanypoisonoussubstancestoescapeintotheenvironment. Creatingproductsoutofrawmaterialscreatesmuchmorewastematerialupto100timesmorethanthematerialcontainedinthefinishedproducts.Consideragainthecell﹣phoneandimaginetheminesthatproducedthosemetalsthefactoriesneededtomaketheboxandpackaging包装itcamein.Manywastesproducedintheproducingprocessareharmfulaswell. TheU.S.EnvironmentalProtectionAgencynotesthatmostwasteisdangerousinthattheproductiondistributionanduseofproducts﹣aswellasmanagementoftheresultingwaste﹣allresultingreenhousegasrelease.Individualscanreducetheircontributionbycreatinglesswasteatthestart﹣forinstancebuyingreusableproductsandrecycling. Inmanycountriestheconceptofextendedproducerresponsibilityisbeingconsideredorhasbeenputinplaceasanincentive动机forreducingwaste.Ifproducersarerequiredtotakebackpackagingtheyusetoselltheirproductswouldtheyreducethepackaginginthefirstplace? Governments'incentivetorequireproducerstotakeresponsibilityforthepackagingtheyproduceisusuallybasedonmoney.Whytheyaskshouldcitiesortownsberesponsibleforpayingtodealwiththebubblewrap气泡垫thatencasedyourtelevision? Fromthegovernments'pointofviewaprimarygoaloflawsrequiringextendedproducerresponsibilityistotransferboththecostsandthephysicalresponsibilityofwastemanagementfromthegovernmentandtax﹣payersbacktotheproducers. 58.BymentioningtheSwissstudytheauthorintendstotellusthat. A.theweightofe﹣goodsisrathersmall B.E﹣wastedeservestobemadegooduseof C.naturalmineralscontainmorepreciousmetals D.thepercentageofpreciousmetalsisheavyine﹣waste 59.Theresponsibilityofe﹣wastetreatmentshouldbeextended. A.fromproducerstogovernments B.fromgovernmentstoproducers C.fromindividualstodistributors D.fromdistributorstogovernments 60.Whatdoesthepassagemainlytalkabout? A.Theincreaseine﹣waste. B.Thecreationofe﹣waste. C.Theseriousnessofe﹣waste. D.Themanagementofe﹣waste.
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Itmighthavesavedmesometroubletheschedule. A.didIknow B.haveIknown C.doIknow D.hadIknown
中国古代数学著作九章算术中有这样一个问题“某贾人擅营月入益功疾注从第2月开始每月比前一月多入相同量的铜钱第3月入25贯全年按12个月计共入510贯”则该人第12月营收贯数为．
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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B.
A.4R.＝h B.2R.＝h C.R.＝h R.＝2h
A.2R.B.
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