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如图甲所示，正方形导线框固定在匀强磁场中，磁感线方向与导线框所在平面垂直，磁感应强度B随时间t变化的规律如图乙所示，其中B0、t0均为已知量．已知导线框的边长为L，总电阻为R，则下列说法中正确的是（...
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高三下学期物理《》真题及答案
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如图所示正方形导线框ABCD.abcd的边长均为L.电阻均为R.质量分别为2m和m它们分别系在一跨过
匀速运动的速度大小
两线框刚开始做匀速运动时轻绳上的张力F
T
=mg
导线框abcd通过磁场的时间
两线框从开始运动至等高的过程中所产生的总焦耳热
如图所示用均匀导线做成一个正方形线框每边长为0.2cm正方形的一半放在和线框垂直的向里的匀强磁场中当
如图所示边长为L.电阻为R.的单匝正方形导线框abcd自空中落下恰好能以速度v匀速进入一磁感强度为B
如右图所示在光滑水平桌面上有两根弯成直角的相同金属棒它们的一端均可绕固定转动轴O.自由转动另一端a相
如图所示边长为2L的正方形虚线框内有垂直于纸面向里的匀强磁场一个边长为L的正方形导线框所在平面与磁
磁感应强度为B.的匀强磁场仅存在于边长为2l的正方形范围内有一个电阻为R.边长为l的正方形导线框ab
7分如图15所示边长L=0.20m的正方形导线框ABCD由粗细均匀的同种材料制成正方形导线框每边的电
矩形导线框abcd固定在匀强磁场中如图K41－10甲所示磁感线的方向与导线框所在平面垂直规定磁场的正
从0到t
1
时间内，导线框中电流的方向为adcba
从0到t
1
时间内，导线框中电流越来越小
从t
1
到t
2
时间内，导线框中电流越来越大
从t
1
到t
2
时间内，导线框bc边受到的安培力大小保持不变
图K41－10
正方形的导线框质量m=60g边长=12cm电阻R=0.06Ω在竖直平面内自由下落H=5m后下框边进入
矩形导线框abcd固定在匀强磁场中磁感线的方向与导线框所在平面垂直规定磁场的正方向垂直低面向里磁感应
如图所示固定在匀强磁场中的正方形导线框abcd边长为L.其中ab边是电阻为R.的均匀电阻丝其余三边是
矩形导线框固定在匀强磁场中如图甲所示磁感线的方向与导线框所在平面垂直规定磁场的正方向为垂直纸面向里磁
从0到t
1
时间内，导线框中电流的方向为abcda
从O到t
1
时间内，导线框中电流越来越小
从0到t
2
时间内，导线框中电流的方向先为adcba后变为abcda
从0到t
2
时间内，导线框ab边受到的安培力先减小后增大
如图所示垂直纸面的匀强磁场分布在正方形虚线区域内电阻均匀的正方形导线框abcd位于虚线区域的中央两正
导线框ab边中产生的感应电流方向相反
导线框cd边两端电势差的大小相同
通过导线框某一截面的电荷量相同
导线框中产生的焦耳热相同
如图所示质量为m的U.型导线框abcd其质量均匀分布ab与cd长度均为l宽度bc为s导线框置于竖直向
如图所示在光滑绝缘的水平面的上方存在有竖直方向的匀强磁场AB.CD是磁场区域的边界一个边长比磁场宽度
进入过程导线框的速度变化量大于离开过程导线框的速度变化量
进入过程导线框的动能变化等于离开过程导线框的动能变化
进入过程导线框产生的热量小于离开过程导线框产生的热量
进入过程通过导线框横截面积的电量等于离开过程通过导线框横截面积的电量
2018届苏州市高三物理期初调研如图甲所示矩形导线框固定在匀强磁场中磁感线方向与导线框所在平面垂直.
从0到t
2
时间内，导线框中电流的方向先为adcba再为abcda
从0到t
2
时间内，导线框中电流的方向始终为adcba
从0到t
1
时间内，导线框中电流越来越小
从0到t
1
时间内，导线框ab边受到的安培力越来越小
如图所示在磁感强度为B.方向竖直向下的匀强磁场中放有一边长为l的单匝正方形闭合导线框电阻为R..1当
矩形导线框固定在匀强磁场中如图甲所示.磁感线的方向与导线框所在平面垂直规定磁场的正方向为垂直纸面向里
从0到t
1
时间内，导线框中电流的方向为abcda
从0到t
1
时间内，导线框中电流越来越小
从0到t
2
时间内，导线框中电流的方向始终为adcba
从0到t
2
时间内，导线框各边受到的安培力越来越大
正方形导线框abcd匝数为10匝边长为20cm在磁感强度为0.2T的匀强磁场__绕与B.方向垂直的转
磁感应强度为B.的匀强磁场仅存在于边长为2l的正方形范围内有一个电阻为R.边长为l的正方形导线框ab
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6分ThatMondaymorningfeelingcouldbeacrushingpaininthechestwhichleavesyousweatingandgaspingforbreath气喘吁吁.RecentresearchfromGermanyandItalyshowsthatheartattacksaremorecommononMondaymorningsanddoctorsblamethestressofreturningtoworkaftertheweekendbreak. Theriskofhavingaheartattackonanygivendayshouldbeoneinsevenbutasix﹣yearstudyhelpedbyresearchersattheFreeUniversityofBerlinofmorethan2600Germansshowedthattheaveragepersonhada20percenthigherchanceofhavingaheartattackonaMondaythanonanyotherday. WorkingGermansareparticularlynotprotectedagainstattackwitha33percenthigherriskatthebeginningoftheworkingweek.Non﹣workersbycomparisonappeartobenomoreatriskonaMondaythananyotherday. Astudyof11000Italiansproved8a.m.onaMondaymorningasthemoststressfultimefortheheartandbothstudiesshowedthatSundayistheleaststressfuldaywithfewestheartattacksinbothcountries. ThefindingcouldleadtoabetterunderstandingofwhatistheimmediatecauseofheartattacksaccordingtoDrStefanWillichoftheFreeUniversity.Weknowalotaboutlong﹣termriskfactorssuchassmokingandcholesterol胆固醇butwedon'tknowwhatactuallycausesheartattackssowecan'tgiveclearadviceonhowtopreventthemhesaid. Mondaymorningshaveadoublehelpingofstressfortheworkingbodyasitmakesarapidchangefromsleeptoactivityandfromtherelaxingweekendtothepressuresofwork. Whenpeoplegetuptheirbloodpressureandheartrategoupandtherearehormonal内分泌changesintheirbodiesWillichexplained.A1thesethingscanhaveanunfavorableeffectinthebloodsystemandincreasetheriskofaclot血凝块whichwillcauseaheartattack. Whenpeoplereturntoworkafteraweekendoffthepaceoftheirlifechanges.TheyhaveahigherworkloadmorestressmoreangerandmorephysicalactivitiessaidWillich. 32.Mondaymorningfeelingasthispassageshows. A.isnotasseriousaspeoplethought B.isthefirttkillerinGermanyandItaly C.iscreatedbyresearchersinGermanyandItaly D.isharmfultoworkingpeopleinthecountriessurveyed 33.Toprotectpeoplefromaheartattackdoctorshavepaidmuchattentionto. A.people'sworkingtime B.people'slivingplace C.people'sdietandlifestyle D.people'snationalities 34.ItcanbelearnedfromthispassagethattheheartattackhassomethingtodowithallthefollowingEXCEPT. A.bloodpressure B.heartrate C.hormonalchanges D.bloodtype 35.IftheresearchersgiveussomeadvicetoavoidMondaymorningfeelingwhatmightitbe? A.Improveworkingconditions. B.NevergotoworkonMondays. C.StaywithadoctoronMondays. D.TakemedicinesonMondaymornings.
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In1989an8.2earthquakealmostflattedAmericakillingover30000peopleinlessthanfourminutes.Inthemiddleofcompletedamageanddisorderafatherrushedtotheschoolwherehissonwassupposedtobe21thatthebuildingwas22.Aftertheshockhe23thepromisehehadmadetohissonNomatter24I'llalwaysbethereforyou!Andtearsbeganto25hiseyes.Ashelookedatthepileofruinsitlookedhopelessbuthekeptrememberinghis26tohisson.Herushedthereandstarted27theruins. Ashewasdiggingotherhelplessparentsarrived28It'stoolate!They'vealldead!29facereality!There'snothingyoucando!Toeachparentheparentherespondedwith30Areyougoingtohelpmenow?Noonehelped.Andthenhecontinuedtodigforhissonstonebystone. Courageouslyhewentonalonebecauseheneededtoknow31Ismyboy32orishedead?Hedugforeighthours…12hours…24hours…36hours…Thenin33hourhepulledbackalargestoneandheardhisson's34.Hescreamedhisson'snameARMAND!HeheardbackDad!?!It'smeDad!Itoldtheotherkidsnottoworry.Itoldthemthatifyouwerealiveyou35meand36yousavedmethey'dbesaved.Youpromised‘NomatterwhathappensI'llalwaysbethereforyou!'YoudiditDad! What‘sgoingoninthere?thefatherasked. Thereare14ofus373833Dad.We'rescaredhungrythirstyandthankfulyou'rehere.Whenthebuildingcollapseditmade39anditsavedus. Comeoutboy! NoDad!Lettheotherkidsoutfirst40Iknowyou'llgetme!NomatterwhathappensIknowyou'llalwaysbethereforme! 21.A.onlydiscovering B.onlytodiscover C.onlyrealizing D.onlytorealize 22.A.asflatasapancake B.ashighasamountain C.asstrongasanox D.asweakasakitten 23.A.memorized B.forgot C.kept D.remembered 24.A.whathappens B.whathappen C.which D.who 25.A.fill B.fillin C.come D.burst 26.A.picture B.promise C.present D.encourage 27.A.digging B.diggingthrough C.diggingout D.digginginto 28.A.tosay B.said C.andsaying D.saying 29.A.Comeout B.Comeagain C.Comeon D.Comeoff 30.A.onenoise B.onesound C.onerow D.oneline 31.A.forhimself B.ofhimself C.byhimself D.tohimself 32.A.live B.livable C.alive D.lively 33.A.38 B.the38 C.38th D.the38th 34.A.sound B.voice C.noise D.tone 35.A.willsave B.wouldsave C.save D.wouldhavesaved 36.A.when B.because C.evenif D.though 37.A.remained B.missing C.left D.gone 38.A.for B.behind C.outof D.over 39.A.apromise B.space C.room D.atriangle 40.A.because B.though C.when D.eventhough
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8分ThereisnoquestionthatfewerteenagersareontheroadsintheUS. In197850%of16﹣year﹣oldshadgottheirfirstdrivinglicence.In2008accordingtotheUSTransportationDepartmentitwasjust30%.Thenumberofthoseaged19andunderwithdrivinglicenceshasalsobeendecliningsince1978when11989000hadlicence.In2010itwas9932441or4.1%ofAmericandrivers. IntheUK683273teenagershavedrivinglicences﹣just1.85%oftotallicenceholdersaccordingtoDepartmentofTransportfiguresfromSeptember2010. ButthedeclineintheUSmayhavemoretodowithtoughertestsandtheintroductionofthenewruleinmanystateswhichforcedriversagedunder16tobeaccompaniedbylicenseddriversof21yearsandolderwhendrivingthanthegrowthofsocialnetworking. InrecentyearstheannualnumberofjourneysbeingmadebyAmericandriversofallageshasdeclinedclearlyforthefirsttimeever.Carusebeganfallingin2007whenaveragepetrolpricesalmostdoubledto$4.12agallonandtheeconomybecameworse. ButtherearesignsthatAmericanremainsacountryonwheels.Ithasahighernumberofcarsperheadofpopulationthananyothercountryintheworld. CarswillalwaysbeapopularmeansoftransportationinAmerica.Youhavetotakeintoconsiderationsomeplacesdon'thaveaccesstopublictransportation.CarsaretheonlywaysomepeoplecangetaroundsaysKristinNevels.Thismakesdrivingnecessaryinsomeruralstateswhereabouttwiceasmanyteenagersareontheroadthaninbigcities. 29.Whatwouldbethebesttitleforthetext? A.DrivingintheUS. B.TransportationintheUS. C.USTeenagersDriveLess. D.PeopleLikeCarsintheUS. 30.whichofthefollowingisnotthereasonwhycarsareusedlessthanbefore? A.trafficjams B.hardertests C.expensivepetrol D.worsteconomy 31.WecanlearnfromthelastparagraphthatKristinNevels. A.doubtsthepopularityofthecaruseinthefuture. B.thinksAmericanpeoplecanlivewithoutcars. C.holdsconfidentattitudetothecars'useinAmerica. D.believesAmericashouldbuildupitspublictransportation. 32.Whatcanbeinferredfromthetext? A.TheUKhasmoreteenagerdriversthantheUS. B.A15﹣year﹣oldboycannotdrivealoneintheUS. C.TheUShasverydevelopedbustransportationsystem. D.BigcitieshavemoreteenagerdriversthanruralareasintheUS.
20分Itaughttwoyearsagointhesecondgradeasastudentteacher实习教师.Iwasluckyenoughtobewiththe41classforanentireschooiyear.ThenIkneweveryoneinmyclasswell.InMaywhenI42theteachingIdecidedtobuystar﹣﹣shapedpiecesofpaperforeachkidasagift.IwroteoneachpieceMissH.thinksyou'rea43because…andthenwrotealittlefactabouteachone.Iwasdoubtful怀疑的aboutdoingthissincethoselittlekidswereso44butoneofmyfriends45thatifthestarwouldmeansomethingtothemthenitwasworthmy46. OneofthelittlegirlsMeganhadADHD儿童多动症andwasgoingthroughmore47toseeifshehadanother48disabilitywhichwouldinfluenceherstudy.Thethingaboutherwasthoughthatshewasso49.Shewassmartinherownway.OnherstarIwroteMissH.thinksyou'reastarbecauseyouhavean50memoryfornames.Ialsothinkyou'resmartandIreally51youcandoanythingifyoutryhardenough. AfterI52thestarsIwasstandinginfrontofthe53teachingthechildrentopackupfortheendofthelastday.Megancameuptome54thestarinherhand. Heydoyou55metoreadthatforyouMegan?Iaskedher. NosherepliedlookingatmewithsmilingeyesIalready56it.ThenshesaidYouthinkI'msmart?ItwaslikeIwasthefirstpersontoever57herthat.Itwaslikethe58thatshewassmarthadneverevencrossedhermind.Therewasnooneelsewhohadsaidthatbefore59shereceivedthatstar. Itwasbyfartheonlygreatest60inmyteachercareer.WheneverIfeeldiscouragedintheclassroomIwouldthinkofit. 41.A.next B.same C.real D.big 42.A.trained B.remembered C.prepared D.finished 43.A.star B.hero C.model D.friend 44.A.young B.sad C.quiet D.patient 45.A.wrote B.reported C.suggested D.imagined 46.A.visit B.chance C.time D.point 47.A.posibilities B.skills C.changes D.tests 48.A.walking B.learning C.speaking D.singing 49.A.clever B.beautiful C.fat D.short 50.A.bad B.early C.excellent D.painful 51.A.ask B.alow C.guess D.believe 52.A.putaway B.gaveout C.tookback D.pickedup 53.A.clasroom B.shop C.hospital D.restaurant 54.A.playing B.making C.using D.holding 55.A.call B.order C.need D.help 56.A.realize B.know C.buy D.forget 57.A.pass B.save C.teach D.tell 58.A.thought B.choice C.power D.dificulty 59.A.unless B.until C.if D.since 60.A.sound B.atitude C.moment D.idea
25分假定你是李华你校下周日将举行为爱奔跑RunforLove公益活动旨在为贫困地区的学生和残疾儿童募捐.请给外教海伦写封电子邮件邀她一起参加要点如下 1.活动的时间地点及目的 2.活动内容跑步捐款等 注意1.词数100左右2.开头结尾已为你写好 DearHelen I'liketoinviteyoutojoinusfortheRunforLove. Lookingforwardtoyourreply. Yours LiHua.
Hemadeasuggestionthatyouassoonaspossible. A.quitsmoking B.quittedsmoking C.mustquitsmoking D.hadquittedsmoking
.5分WangLingavemehistelephonenumberthismorningbutIamafraidIloseit.
15分Doyoueverstopandthinkaboutthisbigbeautifulworldwelivein?It'shome61somanypeopleandanimals.Weallliveinthisamazingplacesoweallhavethe62responsibletotakecareofittoo. AlongtimeagoIstartedthinkingaboutwhatIcoulddotohelptakecareoftheplanet.1wondered63Icouldusemytalentsforever.Ilovecreatingwebsitesandmakingartanddesigningclothes.That'swhat64inspiremeatage8tostartanonlinecompany.Igavepartofmyprofits利润toorganizations65trytheirbesttosaveourenvironment.AfterIlaunchedmybusinessIstartedgetting66invitetogivepresentationstoyoungpeopleaboutmycompanyandtheenvironment.Ialsotalkaboutsomethingelsethat67bemeaningful. OnethingI'velearnedisthatalotofpeoplethink68smallcontributiontoanycauseisjustadropinthebucket桶andwon'tmakeadifference.Butthat'snottrue!69actualwhenitcomestosavingourenvironmenteverysmallactioncounts.The70smallthingisbetterthanthegreatestintention. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70.
﹣﹣﹣Thedoorisopen.SomeonehavecomeinwhileIwasout. ﹣﹣﹣Really?Youcallthepoliceimmediately. A.mightmust B.canneed C.mustmust D.mustcan
谋生.
8分Youwakeupinthemorningthedayisbeautifulandtheplansforthedayarewhatyouhavebeenlookingforwardtoforalongtime.Thenthetelephoneringsyousayhelloandthedramastarts.Thepersonontheotherendhasadepressingtoneinhisvoiceashestartstotellyouhowterriblehismorningisandthatthereisnothingtolookforwardto.Youarestillinawonderfulmood?Impossible! Communicatingwithnegativepeoplecanwashoutyourhappiness.Itmaynotchangewhatyouthinkbutcommunicatinglongenoughwiththemwillmakeyoufeeldepressedforamomentoralongtime.Lifebringsupsanddownsbutsomepeoplearestuckinthewrongideathatlifehasnohappinesstooffer.Theyonlyfeelgladwhentheymakeothersfeelbad.Nowondertheycanhardlywinothers'pityorrespect.Whenyoucommunicatewithpositivepeopleyourspiritstayshappyandthereforemorepositivethingsareattracted.Whenthedagger匕首ofanegativepersonisputinyouyoufeeltheheavyfeelingthatallinallbringsyoudown. Sometimeswehavenochoicebuttocommunicatewithnegativepeople.Thiscouldbeaco﹣workerorarelative.Inthiscasesaywhatneedstobesaidaslittleaspossible.Sometimesitfeelsgoodtoletoutyourangerbacktothenegativepersonbutallthisistoloweryoutothatsamenegativelevelandtheywon'tfeelashamedofthemselvesaboutthat. Negativityoftenaffectshappinesswithoutevenbeingrealized.Thenegativewordsofanotheratthestartofthedaycanclingto附着youthroughouttherestofyourdaywhichmakesyoufeelbadandstealsyourhappiness.Lifeistooshorttofeelnegative.Staypositiveandavoidnegativityasmuchaspossible. 21.Thepurposeofthefirstparagraphisto. A.makeacomparison B.offeranevidence C.introduceatopic D.describeadailyscene 22.Howcannegativepeoplehaveeffectonus? A.Bychangingourwaysofthinking B.Bytellingusthenatureoflife C.Byinfluencingouremotion D.Bycomparingtheirattitudestolifewithours 23.Somenegativepeoplebasetheirhappinesson. A.otherpeople'srespectforthem B.otherpeople'spityforthem C.buildingupapositiveattitude D.makingotherpeopleunhappy 24.Accordingtothepassagetoreducenegativepeople'sinfluenceonusweareadvisedto. A.showourdissatisfactiontonegativepeople B.communicatewithnegativepeopleaslittleaspossible C.changenegativepeople'sattitudestolife D.makenegativepeoplefeelashamedofthemselves.
HarrywaspthatNicholasdidn'tseemtorecognizehim. Itmeansyoudon'tunderstanditorfeelconfused
Wefinallyboughtahousemabouttwelvefeetbyfifteenfeet.Itreferstothingscanbeexpressedinnumberssuchasthelengthorwidth
感到高兴振奋.
8分Usuallywhenyourteacherasksaquestionthereisonlyonecorrectanswer.Butthereisonequestionthathasmillionsofcurrentanswers.ThatquestionisWhat'syourname?Everyonegivesadifferentanswerbuteveryoneiscorrect. Haveyoueverwonderedaboutpeople'snames?Wheredotheycomefrom?Whatdotheymean? People'sfirstnamesorgivennamesarechosenbytheirparents.Sometimesthenameofagrandparentorothermemberofthefamilyisused.Someparentschoosethenameofawell﹣knownperson.AboycouldbenamedGeorgeWashingtonSmithagirlcouldbenamedHelenKellerJones. Somepeoplegivetheirchildrennamesthatmeangoodthings.ClarameansbrightBeatricemeansonewhogiveshappinessDonaldmeansworldrulerLeonardmeansasbraveasalion. Theearliestlastnamesorsurnamesweretakenfromplacenames.AfamilywiththenameBrookorBrooksprobablylivednearbrook小溪SomeonewhowascalledLongstreetprobablylivedonalongpavedroad.TheGreenwoodfamilylivedinornearaleafyforest. Otherearlysurnamescamefrompeople'soccupations.ThemostcommonoccupationalnameisSmithwhichmeansapersonwhomakesthingswithironorothermetals.Inthepastsmithswereveryimportantworkersineverytownandvillage.SomeotheroccupationalnamesareCarter﹣apersonwhoownedordroveacartPotter﹣apersonwhomadepotsandpans. TheancestorsoftheBakerfamilyprobablybakedbreadfortheirneighborsintheirnativevillage.TheCarpenter'sgreat﹣great﹣great﹣grandfatherprobablybuilthousesandfurniture. Sometimespeoplewereknownforthecoloroftheirhairorskinortheirsizeortheirspecialabilities.WhenthereweretwomenwhowerenamedJohninthesamevillagetheJohnwiththegrayhairprobablybecameJohnGray.OrtheJohnwhowasverytallcouldcallhimselfJohnTallman.JohnFishwasprobablyanexcellentswimmerandJohnLightfootwasprobablyafastrunneroragooddancer. Somefamilynamesweremadebyaddingsomethingtothefather'sname.English﹣speakingpeopleadded﹣sor﹣son.TheJohnsonsaredescendantsofJohntheRobertsfamily'sancestorwasRobert.IrishandScottishpeopleaddedMacorMcorO.PerhapsalloftheMacDonnellsandtheMcDonnellsandtheO'DonnellsaredescendantsofthesameDonnell. 24.WhichofthefollowingaspectsdothesurnamesinthepassageNOTcover? A.Placeswherepeoplelived. B.People'sstatus. C.Talentsthatpeoplepossessed. D.People'soccupations. 25.AccordingtothepassagetheancestorsoftheCarpenterfamilymostprobably. A.ownedordroveacart B.madethingswithmetals C.madekitchentoolsorcontainers D.builthousesandfurniture 26.SupposeanEnglishcouplewhoseancestorslivednearaleafyforestwantedtheirnew﹣bornsontobecomeaworldleaderthebabymightbenamed. A.BeatriceSmith B.LeonardCarter C.GeorgeLongstreet D.DonaldGreenwood 27.Theunderlinedworddescendantsinthelastparagraphmeansaperson's. A.latergenerations B.friendsandrelatives C.colleaguesandpartners D.latersponsors.
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两线框刚开始做匀速运动时轻绳上的张力FT=mg 导线框abcd通过磁场的时间
两线框从开始运动至等高的过程中所产生的总焦耳热
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