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如图所示，设地球半径为R，假设某地球卫星在距地球表面高度为h的圆形轨道Ⅰ上做匀速圆周运动，运行周期为T，到达轨道的A点时点火变轨进入椭圆轨道Ⅱ，到达轨道的近地点B时，再次点火进入近地轨道Ⅲ绕地做匀速...
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高三下学期物理《》真题及答案
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已知地球半径为R.地球自转的周期为T.地球表面的重力加速度为g求1第一宇宙速度2地球同步卫星离地面的
某人造卫星进入一个绕地球转动的圆形轨道上它每天绕地球转8周假设地球同步卫星绕地球运行的轨道半径为地球
绕地球运行的周期等于3h
距地面高度为地球半径的1.65倍
绕地球运行的速率为地球同步卫星绕地球运行速率的2倍
绕地球运行的加速度与地球表面重力加速度之比为200：1089
地球表面的重力加速度为g地球半径为R.自转周期为T.求地球的同步卫星离地面的高度.【2】
地球表面的重力加速度为g地球半径为R.有一颗卫星绕地球做匀速圆周运动轨道离地面的高度是地球半径的3倍
如图所示一颗轨道位于赤道所在平面运行方向与地球自转方向相同的人造卫星其圆形轨道半径为地球半径R的两倍
设地球半径为R.地球表面的重力加速度为g地球自转角速度为则沿地球表面运行的人造地球卫星的周期为___
人造地球卫星在距地球表面高度等于地球半径3倍处做匀速圆周运动已知地球半径为R.地球表面的重力加速度为
有一探测卫星在地球赤道正上方绕地球做匀速圆周运动已知地球质量为M.地球半径为R.万有引力常量为G.探
已知地球半径为R.引力常量为G.地球同步通信卫星周期为T.它离地面的高度约为地球半径的6倍1求地球的
嫦娥一号探月卫星为绕月极地卫星.利用该卫星可对月球进行成像探测.设卫星在绕月极地轨道上做匀速圆周运动
如图所示A.是地球的同步卫星已知地球半径为R.地球自转角速度为ω地球表面的重力加速度为g1求出同步卫
有一探测卫星在地球赤道正上方绕地球做匀速圆周运动已知地球质量为M.地球半径为R.万有引力常量为G.探
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设地球半径为R.地球表面的重力加速度为g若某质量为m的地球同步通讯卫星离开地面的高度为H.则它绕地球
目前地球上很多通讯是靠地球同步卫星完成的已知地球表面的重力加速度为g地球半径为R.地球自转周期为T.
设地球半径为R.地球表面的重力加速度为g地球自转角速度为则沿地球表面运行的人造地球卫星的周期为___
设地球表面的重力加速度为g0则在地球表面上空h＝R.R.是地球半径处的重力加速度g＝______g0
2013北京海淀期中有一探测卫星在地球赤道正上方绕地球做匀速圆周运动已知地球质量为M.地球半径为R.
已知万有引力常量为G.地球半径为R.同步卫星距地面的高度为h地球的自转周期为T.地球表面的重力加速度
质量为m的卫星围绕地球做匀速圆周运动轨道半径是地球半径的2倍已知地球半径为R.地球表面的重力加速度为
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8分WhatwouldyouthinkifsomeonesuggestedknockingdownStPaul'sCathedraltowidentheroad?OrpullingdownBigBentomakewayforacarpark?Itwouldberidiculousright?Butwhenitcomestodestructionofthenaturalworldwearen'tsoeasilyshocked.Butweshouldbe…orwe'llbeinalotoftrouble. Natureisshrinkingbytheday.Ancientforestsaredestroyed.Wetlandsarebecomingdry.Woodlandisdisappearingandallinthenameofprogress.Thisisbadinitselfbutit'sdestructingforbiodiversity. Biodiversityreferstothevarietyofplantsanimalsandotherlivingthingsthatareallinterconnected.Theecologicalservicesprovidedbybiodiversityarevitaltoeverydaylife.Theairwebreatheisaproductofphotosynthesis光合作用bygreenplants.Insectswormsandbacteriabreakdownwasteandmakesoilsrich.Andtinyorganismscleanthewaterinriversandsea.Infactalllifeontheearthexiststhankstothebenefitsofbiodiversity.Morethan90percentofthecaloriesconsumedbypeopleworldwideareproducedfrom80plantspecies.And30percentofmedicinesaredevelopedfromplantsandanimals.Maintainingawidediversityofspeciesineachecosystemisnecessarytopreservealllivingthings. Thelossofbiodiversitycouldbedevastating.ItiswrongtothinkthatbiodiversitycanbereducedindefinitelywithoutthreateninghumanssaidHarvardUniversitybiologistEdwardO.Wilsonknownasthefatherofbiodiversity.HewarnedWeareabouttoreachacriticalpointbeyondwhichbiodiversitylosswillbecomeirreversible不可挽回的. Butwhatcanwedo?Thepresentproblemisthattheconceptofbiodiversityisnotsoclear.Peoplemightcareaboutgiantpandasbutitismuchhardertoexcitethemaboutthefateoftinyseacreatureswhicharebeingboiledtodeathinthecoolingsystemsofpowerstationsalongcoastlines.TheGuardiannewspaperistryingtohelp.IthaslaunchedtheBiodiversity100campaigntotrytoconvincegovernmentsaroundtheworldtotakeactiontodealwiththewidespreadconcernsaboutbiodiversity.ThisincludespersuadingtheUKgovernmenttocreateaseriesofmarinereservestoreservethedecreaseinthesea﹣lifecausedbyindustrialfishingstoppingfishingsharksbytheJapanesefishermenandbanningthekillingofdingoes澳洲野犬inAustraliaamongmanyotherthings. Thereisalottodo.Andwe'dbetteractquicklyifwedon'twanttoendupwithaplanetthatcan'tsustain维持life! 32.ThewriterthinksittopulldownBigBentomakewayforacarpark. A.unreasonable B.necessary C.difficult D.risky 33.TheunderlinedsentenceNatureisshrinkingbytheday.Tellsusthat. A.natureisbeingpollutedbyhumanbeings B.thenumberofspeciesarereducingdaybyday C.rainforestsarebeingcutdowneveryday D.naturewillbetotallydestroyedinafewdays 34.Whenitcomestobiodiversitythepresentproblemisthat. A.peoplemightnotknowexactlywhattodoforbiodiversity B.peoplearenotawarethatgiantpandasareendangered C.peopledon'trealizethatbiodiversityisvitaltoeverydaylife D.peoplehuntandboilseacreaturesforfood 35.WhatdoestheunderlinedwordItinparagraph5referto? A.TheUKgovernment. B.Theconceptofbiodiversity. C.Theactiontodealwiththeproblem. D.TheGuardiannewspaper.
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在△ABC中已知则∠C＝．
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20分 MusictoMyEars Robbywas10forhisfirstpianolessoninmyclass.Muchashetriedhe46eventhebasicrhythm.HoweverhedutifullyreviewedthepiecesthatIrequired. OverthemonthshetriedandtriedwhileI47andencouragedhim.Attheendofeachlessonhe'dalwayssayMymom'sgoingtohearmeplaysomeday.48itseemedhopeless. Ionlyknewhismotherfroma49asshewaitedinheragedcartopickhimup.ThenonedayRobbystoppedcoming.Iwassecretly50thathestoppedbecauseofhislackofability. WeekslaterIinformedthestudentsofthecomingrecital独奏.Tomy51Robbyaskedmeifhecouldbeincluded.Itoldhimhereallydidnotqualifybecausehehad52out.Hesaidhismomhadbeensickandunabletotakehimtolessonsbuthewasstill53. I'vejustgottoplay!he54.Somethinginsidemeletmeallowhimto. Thencametherecitalnight.Thegymwas55withparents.IputRobbyup56thinkingthatIcouldsavehispoorperformancethroughmycurtaincloser谢幕. Therecitalwentoffsmoothly.ThenRobbycameuponstage.Hisclotheswerewrinkledandhishairwas57.Whydidn'thismotheratleastmakehimcombhishairforthisspecialnight?Ithought. Robbypulledoutthepianobenchandbegan.Iwasnot58forwhatIheardnext.Hisfingerswere59onthekeys.NeverhadIheardMozartplayedsowellbypeopleofhisage.Afterheendedeveryonewas60theirfeetinwildapplause. In61IranuponstageandputmyarmsaroundRobby.I'veneverheardyouplaylikethatRobby!Howdidyou62it? RobbyexplainedWellMissHondorf…rememberItoldyoumymomwassick?…63shehadcancerandpassedawayyesterday.Shewasborndeafsotonightshecouldhearmeplayinheaven.Iwantedtomakeitspecial. Therewasn'ta64eyeinthehouse.ThatnightIfelthewastheteacherandIwasthepupilforitwashewhotaughtmethemeaningofperseveranceand65. 46.A.lacked B.had C.showed D.got 47.A.listened B.learned C.checked D.played 48.A.And B.But C.So D.Or 49.A.conversation B.performance C.distance D.picture 50.A.guilty B.sad C.anxious D.glad 51.A.relief B.surprise C.pleasure D.satisfaction 52.A.stepped B.worn C.run D.dropped 53.A.acting B.performing C.practicing D.recording 54.A.insisted B.suggested C.complained D.threatened 55.A.lined B.packed C.piled D.covered 56.A.least B.most C.first D.last 57.A.messy B.cool C.neat D.dull 58.A.eager B.concerned C.prepared D.grateful 59.A.hesitating B.dancing C.touching D.crawling 60.A.over B.under C.in D.on 61.A.chaos B.tears C.silence D.return 62.A.find B.feel C.make D.like 63.A.Gradually B.Suddenly C.Frequently D.Actually 64.A.dry B.curious C.bright D.wet 65.A.regret B.talent C.love D.courage
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8分Imaginelandinginaforeigncountrywhereyoucannotspeakthelanguageunderstandthecultureanddon'tknowanybody.Wouldn'titbenicetohaveafriendwhocouldhelpyouout? JohnSmithanEnglishexplorerwholandedinAmericain1607foundthebestfriendever.ShewasaNativeAmericannamedPocahontas1595﹣1617.AndshedidmorethanteachSmiththelanguageshesavedhislifetwice. SmithwascapturedbymembersofPocahontas'stribeandwasgoingtobekilled.ButforsomereasontheChief'sdaughterPocahontasfeltsorryforSmithwhowasprobablythefirstwhitemanshehadeverseenandthrewherbodyoverhistoprotecthim.Smithreturnedsafelytothesmallvillagehewaslivingin. DuringthewintertheEnglishsettlersdidnotknowhowtogetfoodfromnature.PocahontasoftenbroughtfoodforSmithandhisfriends. AyearlaterPocahontas'sfathertriedtokillSmithagainbecausetheNativeAmericanswereveryscaredtheEnglishwouldtrytotakeovertheirland.Pocahontaswarnedhimandhewasabletoescape. LatershebecameaChristianandeventuallymarriedanEnglishmannamedJohnRolfe. ShespentthelastyearofherlifeinLondon. PocahontashasbecomeanAmericanlegend.Herlifestoryhasbeenre﹣createdinmanybooksandfilmsincludingDisney's1995filmPocahontas. OneofthereasonssheissopopularisthatmanyEuropeanslookatPocahontasasanexcellentexampleofhowaminoritycanadjustintothemajority.Pocahontasisalsorespectedbecauseofherselflesslove.Sheprovedthatpeoplecanbekindandlovingeventopeopleofadifferentraceorculture.JohnSmithwasverydifferentfromPocahontasbutshecouldseehewasagoodmanandthatwasallthatmattered.Noraceorcountryownsgoodnessloveandloyalty. 24.WhatdifficultiesmightearlyEuropeansettlersmeetinAmericaEXCEPT? A.thefierceconflictwithNativeAmericans B.bad﹣temperednativeswhoenjoyedkilling C.unfamiliaritywithaforeignland D.lackoffoodinwinter 25.PocahontassavedJohnSmithtwicebecause. A.hewasthefirstwhitemanshehadeverseeninherlife B.shewantedtobecomeaChristianandmarryanEnglishman C.shebelievedingeneralkindnesseventopeopleofadifferentrace D.shewasonthesettlers'sideandagainsthercruelfather 26.WhichisNOTanelementtomakePocahontasalegend? A.Hertribalbackgroundandhermarriagetoawhitesettler. B.Herselflesshelptopeopleregardedasenemyofhertribe. C.Hercomplicatedlifestorydifferentfromcommonpeople's. D.Therecreationofherlifestoryinthe1995Disneyfilm. 27.Whatcanweinferfromthepassage? A.ThereweremanyconflictsbetweenearlysettlersandNativeAmericans. B.TheEuropeansthinktheearlysettlersshouldhavelearnedtoadjusttothelocalcultures. C.ThecreationofAmericaisbasedonthesettlers'victoryovertheNativeAmericans. D.Peoplefromdifferentculturescanneverreallygetalongwellwitheachother.
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