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一个圆盘加速转动时，把角速度的增加量△ω与对应时间△的比值定义为角加速度β（即β＝）．我们用电磁打点计时器（所接交流电的频率为50H）、刻度尺等器材进行如下实验来测量圆盘的角加速度： （1）如图甲...
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高三下学期物理《》真题及答案
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8分个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应之间
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时把角速度的增加量△ω与对应时间
8分一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应之
26分在探究功与物体速度变化的关系的实验中某实验探究小组的实验装置如图甲所示弹簧的一端固定在木板的挡
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动用下面的方法测量它匀速转动时的角速度实验器材
转动运动中描述角量的物理量有
时间、位移、速度、加速度；
时间、位移、速度、角速度；
时间、位移、角速度、角加速度；
时间、角位移、角速度、角加速度。
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应时间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应时间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时把角速度的增加量Δω与对应时间
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时把角速度的增加量与对应时间t的
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量△ω与对应时间△
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应时间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应时间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时把角速度的增加量△ω与对应时间
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应之间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时把角速度的增加量△ω与对应时间
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量Δω与对应之间Δ
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量△ω与对应时间△
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动圆盘加速转动时角速度的增加量△ω与对应时间
一个有一定厚度的圆盘可以绕通过中心垂直于盘面的水平轴转动某同学用打点计时器来研究它由静止开始转动的情
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BoatrightaWindermereresidentwhojustwentthroughmidtermsatBishopMooreHighSchoolwasfacedwithalife﹣or﹣deathsituationonaJunetripwithhisfellowScouts童子军upasteepNewMexicomountain.OneoftheirleadersRicCooperfelldownwithoutwarningsome11000feet.AccordingtoBoatrighttheboysknewitwasbadwhenCooper'seyesrolledbackintohishead. InsteadofstandingaroundhopingforthebestIdecidedtotakeoffrunningBoatrightsaid.HeandthreeotherScoutsbeganaspeedyanddangerousfour﹣milerunningdownthemountainwhiletheremainingScoutsandtroopleadersstayedwithCoopertoperformCPR心脏复苏术andbuildshelterItwasaroundlP.mbythistimeandthetemperaturewasreachingitspeakCooperhadsufferedfromaheartattack. BoatringhtandtheothersusedtheskillstheyhadlearnedasScoutstosuccessfullyclimbdownthepathtoBeaubienoneofthelargeststaffcampsatphilmontScoutRanch.TheytoldthepeopleabouttheincidentandarescuehelicopterwasimmediatelysenttomoveCoopertoaplaceofsafetyTheirmissionovertheboysdrankwaterandtriedtostaycalm. Itbeganhittingusthatwemayhaveseenthisguy'slastbreathsonearthBoatrightremembersthinking.WhenofficialsarrivedtotellthemaboutCooper'sconditiontheyaskedtheboystostepoutsideBoatrightandhisfellowScoutswereafraidthatmeantbadnews.Theysaid'Wellhe'sOK'Andthepausebetween'well'and‘OK'wasprobablythelongestmomentyoucouldeverfeel. TheScoutswhoaidedinsavingCooper'slifereceivedtheHonorMedalwhichhasonlybeengiventoalittlemorethan2000Scoutsinnearly100years.BoatrighthasalsobecmeaLifeScoutwhichisthesecond﹣highestrankHeisgratefulforalltheawardsbutmostlyheishumbled谦逊. HismotherEileenBennettishappyhersonheldontohisScouttrainingeveninsuchastressfulsituationSomanyScoutswillgothroughtheirentireScoutlifeandnevercomeacrossanythinglikethisImnothappythatthishappenedbutI'mjustsoproudthattheyhandleditthewaytheydidandmanagedtostayhumbleBennettsaid. 1.Whathappenedatthebeginningofthestory? A.Cooperfelldownthemountain. B.Boatrightwasawardedatschool. C.Cooperwasn'twarnedofthedanger. D.Boatright'seyesrolledbackintohishead. 2.WhatseemedtobethebestactiontotakebytheScouts? A.Seekinghelpfromthestaffcamp. B.Keepingthetemperaturedown. C.Havingagroupleadermeeting. D.Bringthesickdownthemountain. 4.HowdoesEileenBennettthinkoftheevent? A.ItrarelyhappenstoboyScouts. B.Ittaughttheboystobehumble. C.Itwasagoodtrainingexperience. D.Itprovedherson'sfriendsarethebest.
Thistimehehaskeptallthepromisehemade.Idon'treallytrusthim. A.Evenso B.Inshort C.Ifpossible D.Onceagain
NowanyonecanpretendtobeSpider﹣Manbysimplywearingasuitthatletsyoufeelhowcloseyouaretoanearbyobject.Itcanevenletthewearercontrolwiththeireyesclosed. ThesuitcalledSpiderSenseandbuiltbyVictorMateevitsioftheUniversityofIllinoisinChicagohassmallrobotic机器人的armswithmicrophonesthatsendoutandpickupultrasonicreflections超声波反射fromobjects.WhentheultrasoundfindssomeonemovingclosertothemicrophoneitknowsSevenarmsareequippedacrossthesuittogivethewearerasnearto360degreeultrasoundcoverageaspossible. WhensomeoneishittingSpider﹣Manhefeelsitandcanavoidit.OursuitisthesameideasaysMateevitsi.SpiderSensecouldhelpblindpeopletofindtheirwaymoreeasily.Mateevitsitestedthesuitoutonstudentsgettingthemtostandoutsideoncampuseyescoveredandfeelforattackersgettingclose.EachwearerhadninjacardboardthrowingstarstousewhenevertheysensedsomeonegettingcloseNinetyfivepercentofthetimetheywereabletosensesomeonecomingnearandthrowthestaratthemsaysMateevitsi. I'mveryexcitedaboutthissaysGershonDublonoftheMassachusettsInstituteofTechnologywhoalsoworksonotherpartsofthehumanbody.Mateevitsi'sworkisastepontheroadtogivinghumanstrulyintegratedextrasensoryperception超感知. Mateevitsiwantstousethesuitofjustafewsensorsonthearmsandbacktoincreasecyclists'awarenessofothertrafficontheroad.SpiderSenseisduetobepresentedataninternationalconferenceinGermanythisyear.TheteamnowplanstoaddmoresensorstothesuittoincreaseitsresolutionTheteamalsoplanstobeginexperimentsonSpiderSeneswithblindpeople. Wehumanshavethesensesthatwearebornwithandwecan'textendthemMateevitsisays.Buttherearesomethreatswhichareverydeadlybutwecan'tsensethemlikeradiaton辐射Electronicsensorscanfeelthosethreats. 1.HowcanSpiderSensehelpusinourdailylife? A.Make360degreeturns. B.Fightbackwhenattacked. C.Warnitswearerofacomingdanger. D.Sendoutandreceivetextmessages. 2.WhatcanweinferfromMateevitsi'stestofSpiderSense? A.Itisofgreatfun B.Itworkswell. C.Itreactstoblindpeople. D.Itiswelcomeoncaucus. 3.WhatcanwelearnaboutSpiderSensenow? A.Ithelpscyclistsontheroad. B.ItisstillaSpider﹣Manidea. C.Itisatthedevelopmentalstage. D.Itssensorssendoutradiation. 4.Whattypeoftextisthispassage? A.Asciencereport. B.Afilmreview. C.Amedicalrecord. D.Afairytale.
ShenyisateacherinCaithness.isalmostasfarnorthasyoucango. A.That B.Where C.Which D.What
Agardenthat'sjustrightforyou Haveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess. ●37 Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears. ●Recall回忆yourchildhoodmemories Ourmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun. A.Knowwhyyougarden B.Findagoodplaceforyourowngarden C.It'sourexperienceofthegardenthatmatters D.It'sdelightfultoseesomanybeautifulflowers E.Stillothersmaysimplyenjoybeingoutdoorsandclosetoplants F.Youcanproducethatkindofmagicalqualityinyourowngardentoo G.Foreachofthosegardenswriterdownthestrongestmemoryyouhave. 36. 37. 38. 39. 40.
Hetriedhardtojointhearmybutwasbecauseofpoorhealth. A.turneddown B.goneout C.keptaway D.takenin
OurdecisiontobuildthemuseuminHartlepoolwasbasedonthethattherewerenonationalmuseumsintheNorthEast A.feet B.goal C.thing D.belief
一个四棱锥的直观图和三视图如图所示 1求证面PBD⊥面ABCD 2求三棱锥A﹣PDC的体积 3试在PB上求点M使得CM∥平面PDA．
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaidMakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek. Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations. OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents. Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.WithoutfailonewoulddeclareButI'mjustnotcreative. Doyoudreamatnightwhenyou'reasleep? Ohsure. Sotellmeoneofyourmostinterestingdreams.Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.That'sprettycreative.Whodoesthatforyou? Nobody.Idoit. Really﹣atnightwhenyou'reasleep? Sure. Trydoingitinthedaytimeinclassokay? 25.TheteacherusedTinkertoysinclassinorderto? A.knowmoreaboutthestudents B.makethelessonsmoreexciting C.raisethestudents'interestinart D.teachthestudentsabouttoydesign 26.WhatdoweknowabouttheboymentionedinParagraph3? A.Helikedtohelphisteacher. B.Hepreferredtostudyalone. C.Hewasactiveinclass. D.Hewasimaginative. 27.WhatdoestheunderlinedworddownsideinParagraph4probablymean? A.Mistake. B.Drawback. C.Difficulty. D.Burden. 28.Whydidtheteacheraskthestudentstotalkabouttheirdreams? A.Tohelpthemtoseetheircreativity. B.Tofindoutabouttheirsleepinghabits. C.Tohelpthemtoimprovetheirmemory. D.Tofindoutabouttheirwaysofthinking.
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife. FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship. TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback. AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished. 33.WhatdoweknowaboutthephotostakenbyHurley? A.Theyweremadelastweek B.Theyshowedunderseasceneries C.Theywerefoundbyacameraman D.Theyrecordedadisastrousadventure 34.WhoreachedtheSouthPolefirstaccordingtothetext? A.FrankHurley B.ErnestShackleton C.RobertFalconScott D.CarolineAlexander 35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage? A.Artisticcreation B.Scientificresearch C.Moneymaking D.Treasurehunting.
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