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如图,地球与月球可以看作双星系统,它们均绕连线上的C点转动在该系统的转动,平面内有两个拉格朗日点L2、L4(位于这两个点的卫星能在地球引力和月球引力的共同作用下绕C点做匀速圆周运动,并保持与地球月球...
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月球与地球质量之比约为180一般情况下我们认为月球绕地球运动其轨道可近似认为是圆周轨道但有研究者提出
已知某双星系统中两颗恒星绕它们线上的某一固定点分别做匀速圆周运动周期均为T两星距离为r试推算这个双星
月球与地球的质量之比约为1:80有研究者认为月球和地球可视为一个由两质点构成的双星系统它们都围绕月地
1:6400
1:80
80:1
6400:1
2016年·白银市会宁二中模拟月球与地球质量之比约为180有研究者认为月球和地球可视为一个由两质点构
1:6400
1:80
80:1
6400:1
宇宙中存在一些离其他恒星较远的两颗星组成的双星系统通常可忽略其他星体对它们的引力作用已知双星系统中星
12.天文学家将相距较近仅在彼此的引力作用下运行的两颗恒星称为双星双星系统在银河系中很普遍利用双星系
月球与地球质量之比约为180一般情况下我们认为月球绕地球运动其轨道可近似认为是圆周轨道但有研究者提出
天文学家将相距较近仅在彼此的引力作用下运行的两颗恒星称为双星双星系统在银河系中很普遍利用双星系统中两
宇宙中由两颗相距较近且质量差别不太大的恒星其它天体对它们的万有引力可以忽略不计它们在相互之间的万有引
轨道半径都与地球的相等
加速度都与地球的相等
线速度都与地球的相等
转动周期都比地球的小
宇宙中两颗靠得比较近的恒星只受到彼此之间的万有引力作用相互绕转称之为双星系统.在浩瀚的银河系中多数恒
B.绕其连线上的O.点做匀速圆周运动,如图6所示.若AO>OB,则 ( )
图6 A.星球A.的质量一定大于
的质量 B.星球A.的线速度一定大于B.的线速度
双星间距离一定,双星的质量越大,其转动周期越大
双星的质量一定,双星之间的距离越大,其转动周期越大
天文学家将相距较近仅在彼此的引力作用下运行的两颗恒星称为双星双星系统在银河系中很普遍利用双星系统中两
宇宙中两颗靠得比较近的恒星只受到彼此之间的万有引力作用互相绕转称之为双星系统在浩瀚的银河系中多数恒星
B.绕其连线上的O.点做匀速圆周运动,如图所示。若AO>OB,则 A.星球A.的质量一定大于
的质量 B.星球A.的线速度一定大于B.的线速度
双星间距离一定,双星的质量越大,其转动周期越大
双星的质量一定,双星之间的距离越大,其转动周期越大
宇宙中两颗靠得比较近的恒星只受到彼此之间的万有引力作用互相绕转称之为双星系统设某双星系统绕其连线上的
星球A.的向心力一定大于
的向心力 B.星球A.的线速度一定大于B.的线速度
星球A.的质量一定大于B.的质量
双星的总质量一定,双星之间的距离越大,其转动周期越大
10分天文学家将相距较近仅在彼此的引力作用下运行的两颗恒星称为双星.双星系统在银河系中很普遍.利用双
月球与地球质量之比约为1∶80.有研究者认为月球和地球可视为一个由两质点构成的双星系统它们都围绕月地
1∶6400
1∶80
80∶1
6400∶1
利用万有引力定律可以测量天体的质量.1测地球的质量英国物理学家卡文迪许在实验室里巧妙地利用扭秤装置比
月球与地球的质量之比约为180有研究者认为月球和地球可视为一个由两质点构成的双星系统它们都围绕月地连
1:6400
1:80
80:1
6400:1
宇宙中两颗靠得比较近的恒星只受到彼此之间的万有引力作用互相绕转称之为双星系统.在浩瀚的银河系中多数恒
B.绕其连线上的O.点做匀速圆周运动,如图所示.若AO>OB,则( )
A.星球A.的质量一定大于
的质量 B.星球A.的线速度一定大于B.的线速度;
双星间距离一定,双星的质量越大,其转动周期越大
双星的质量一定,双星之间的距离越大,其转动周期越大
若忽略其它星球的影响可以将月球和地球视为双星系统它们都围绕月地连线上某点做匀速圆周运动据此观点月球运
81∶80
80∶81
9∶1
1∶9
在地月系统中若忽略其它天体的影响可将地球和月球看成双星系统即地球和月球在万有引力作用下做匀速圆周运动
地球与月球之间的引力不变
地球与月球之间的引力减小
月球运动的周期不变
月球运动的周期增大
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Thecostofthewholetripshouldbe500dollarsinfigures. A.close B.round C.even D.natural
Rememberbacktowhenyouwereayoungchild.Canyourecallwhoyourheroeswere?Weretheypeopleinyourfamily?WeretheyfrombooksorTVormovies? Duringtheirteenyearsyoungpeoplesearchfortwotypesofheroes.Thefirsttypeofherotheylookforissomeonetheycanadmire.Toooftenhowevertheyconfusesuperstarswithheroes.MostTVormoviesuperstarsaren'treallyheroes﹣﹣﹣they'recelebrities名流productsofthemedia.Thedangercomeswhenyoungpeopleconfusetheheroicwiththefamous.Infactbecausetheydon'thaverealheroespeopleofallagesturntofantasy想象中的heroes.AndthemediainturnfillthisneedwithIndianaJonesSupermanConantheBarbarianJamesBondLukeSkywalkerandotherfantasyfigures. Thesecondtypeofheroyoungpeoplesometimeschoosestandsfordisobedience叛逆towardparentsandrules.AnexampleisBlutoBluntarskyinthemovieAnimalHouse.Blutoisaterribletroublemaker.OfcoursesometeenagersmayactuallyadmireBluto'spersonalqualities. Aretheserealheroes?Notreallybecausewhotheyareandwhattheydoarepurelyadream.Realheroesareonesyouloveandwanttokeepasheroesforever.Celebritiesareeasycomeeasygo. Butdon'tcountrealheroesoutyet.Eveninanagewhenpeoplesaytherearenoheroes﹣﹣﹣onlycelebrities﹣﹣﹣therearecountlessheroes.Therearemanyheroeswhoarenotsowellknown.Theyhaveriskedlifeoranythingvaluableonamatterofprinciple. Everyoneneedsheroestoadmire.Whetherthey'removiestarsrelativesnextdoorneighborsorstrangerswe'vereadaboutweneedthem.Bywhattheydoheroesshowusthatwetoocandosomethingoutstandingevenifweareonlyordinarypeople. 1.Whatproblemdoyoungpeopleoftenhaveaboutheroes? A.Theysearchforheroesintheirdreams. B.Theyneverlearnfromheroes C.Theyareuncertainaboutwhotoadmire D.Theyoftenlovetroublemakers 2.Whatistheauthor'sopinionaboutthetopic? A.Thereareveryfewrealheroes. B.Heroescanbefamouspeople C.Principlescauseheroes'death D.Allpeoplecandosomeheroicdeeds. 3.Youngpeopleneedheroesmainlybecausetheywantto. A.haverolemodels B.becomesuperstars C.admirecelebrities D.lovefantasyfigures 4.Whichofthefollowingcanbethebesttitleforthetext? A.BecomingHeroes B.EverybodyNeedsHeroes C.CelebritiesorHeroes? D.WhyHeroes?
AbeautifulSeptembereveningmy11﹣year﹣oldgrandsonJoshandhisteamwerewarmingupfortheirfirstfootballgameoftheseason. Atsixthe1calledthecaptainsforwardsaidsomethingand2hiswhistle.Thetwoteams3separately.Iwas4.Theotherteamwas5teninchestallerthanourplayers.Itdidn'ttakelongfortheir6advantagetoshow.Theytooka7﹣0leadvery7.Atthehalfthescorestoodat34to6.Josh8minimalplaytime.InthesecondhalftheyusedJoshmoreoften.Thescoreclimbedto40to6. Onceagaintheotherteambegantheir9downthefield.Theirquarterbackthrewtheball.Thereceivercaughtitand10thegoal.Therewasonlyonemaninhis11﹣Josh.Joshdoveand12thatboy'slegswithallhisstrength.ThereceiverdraggedJoshacoupleofyardsand13felldown. OnthenextplaytheirquarterbackshotthroughanopeningandrushedtothegoalbuttherewasJoshagain.Joshtookhimoffhisfeetand14anothergoal.Theyscoredonthelastplay.butitwasn'tJosh's15.Thegameendedwithascoreof48to6. Onthewayhome.Iwantedto16Joshbutheturnedtomewitha17smile.Grandpathatwasa18game. Butyoulost48to6! IknowbutIdidgood. Theboyunderstoodthe19betterthanIdid.Theydidn'twinbuthedidhisbest.Iwasproudofhim.More20hewasproudofhimself. 1.A.player B.referee C.coach D.receiver 2.A.waved B.raised C.threw D.blew 3.A.gathered B.practiced C.celebrated D.wandered 4.A.inspired B.embarrassed C.shocked D.delighted 5.A.intotal B.onaverage C.atlength D.forexample 6.A.speed B.strength C.age D.size 7.A.often B.soon C.regularly D.rarely 8.A.saw B.lost C.expected D.wasted 9.A.break B.search C.charge D.debate 10.A.1etin B.foughtfor C.wentin D.headedfor 11.A.way B.position C.sight D.mind 12.A.maderoomfor B.1ookedupat C.tookholdof D.keptawayfrom 13.A.accidentally B.finally C.deliberately D.gradually 14.A.saved B.gained C.tried D.kicked 15.A.turn B.honor C.fault D.option 16.A.trick B.scold C.praise D.comfort 17.A.sad B.wide C.bitter D.polite 18.A.great B.close C.silly D.vital 19.A.team B.play C.game D.field 20.A.seriously B.fortunately C.specifically D.importantly
下列表述正确的是
Imaginebeingbornwithoutarms.Noarmstohugsomeoneandnohandsto1touch.Orwhataboutbeingbornwithoutlegs?Havingno2todancewalkrunorevenstandontwofeet.Nowputbothofthosescenestogether:noarmsandnolegs.Howwouldthat3one'severydaylife? WithoutanymedicalexplanationNickVujiciccameintotheworldwithneitherarmsnorlegs.Imaginethe4hisparentsfeltwhentheysawtheirbabybeingwhattheworldwouldconsiderimperfectand5.Littledidtheyknowthatthisbeautifullimblessbabywouldonedaybesomeonewhowould6andmotivatepeoplefromallwalksoflife. ThroughouthischildhoodNickdealtwiththe7ofself﹣respectandstruggledwithdepressionand8.AsNickgrewuphelearnedtodealwithhis9andstartedtobeabletodomoreandmorethingsonhisown.He10tohissituationandfoundwaysto11tasksthatmostpeoplecouldonlydobyusingtheirlimbssuchascleaningteeth12hairtypingonacomputeretc.Astime13Nickbegantoeagerlyaccepthis14andachievegreaterthings. Nickgotadoublebachelor'sdegree15inaccountingandfinancialplanning.Bytheageof19Nickhadstartedto16hisdreamofencouragingothersbysharinghisstorythrough17speaking.Hefoundthepurposeofhis18.Nowat27yearsoldhehasaccomplishedmorethanmostpeople.Hehastravelledaround19hisstorywithmillionsofpeople.Heisatrueinspirationalandmotivational20. 1.A.understand B.experience C.know D.prevent 2.A.ability B.interest C.reason D.chance 3.A.affect B.limit C.improve D.design 4.A.calmness B.excitement C.shock D.eagerness 5.A.unique B.abnormal C.extraordinary D.unqualified 6.A.teach B.organize C.inspire D.comfort 7.A.challenge B.management C.question D.load 8.A.tiredness B.disappointment C.loneliness D.relief 9.A.fault B.disability C.shortage D.willpower 10.A.devoted B.attended C.adapted D.stuck 11.A.accomplish B.attain C.find D.reduce 12.A.wearing B.brushing C.cutting D.losing 13.A.wentup B.wentahead C.wentaway D.wentby 14.A.situation B.position C.state D.emergency 15.A.researching B.majoring C.aiming D.choosing 16.A.cometrue B.undertake C.realize D.support 17.A.meaningful B.motivational C.significant D.strong 18.A.action B.behavior C.existence D.communication 19.A.telling B.recalling C.sharing D.writing 20.A.doctor B.speaker C.writer D.driver
Lostwalletswhichcontainapictureofababyaremorelikelytobereturnedtotheirownersscientistshavediscovered. Researchersleft240walletsonthestreetsofEdinburghlastyeartoseehowmanywerereturnedtotheirowners.Someofthewalletscontainedoneoffourphotographs﹣ababyacutelittledogafamilyandaportraitofanelderlycouple.Otherwalletscontainedacardsuggestingtheownerhadrecentlymadeacharitydonationwhileacontrolsample对照组containednothingatall. ProfessorRichardWisemanapsychologistwhowasinchargeoftheexperimentsaid42percentofthewalletswerepostedbackintotal.Thosecontainingthepictureoftheinfantorthebabyweremostlikelytobringaboutanhonestreactionfromthefinderwith88percentbeingreturnedfollowedbythosecontainingpicturesofthelittledogat53percent.Ofthosefeaturingthefamilysnapshot48percentweresenttothereturnaddressandonly28percentofthosewiththepictureoftheelderlycouple.Walletscontainingthecharitycardsandthecontrolsamplewereleastlikelytobereturnedwithratesof20and15percent. ProfWisemanoftheUniversityofHertfordshiresaidThebabykickedoffacaringfeelinginpeoplewhichisnotsurprisingfromanevolutionaryperspective角度.Wewereamazedbythehighpercentageofwalletsthatcameback. Thewalletswereplantedatrandomaboutaquarterofamileapart.Snapshotswereinsertedintoaclearplasticwindowinsidethewalletsnoneofwhichcontainedmoney. 1.What'sthemainideaofthepassage? A.Researchersleft240walletsonthestreetsofEdinburghlastyear. B.ProfessorRichardWisemancarriedoutanexperimentwith240wallets. C.Lostwalletscontainingapictureofababyaremorelikelytobereturned. D.Walletswithcontainnothingaremostlyreturnedtotheirowners. 2.Thepassageismadebelievableby. A.tellingstories B.usingfigures C.askingquestions D.givingexamples 3.TheunderlinedphrasekickedoffinParagraph4mostprobablymeans. A.caused B.showed C.avoided D.accepted 4.Itcanbeinferredthat. A.peoplewhoreturnedthewalletsareinterestedinpsychology B.dogsaremorerespectedinwesterncountriesthantheelderly C.ProfessorWisemanhadexpectedtheresultbeforetheexperiment D.theresultoftheexperimentcanbedifferentifwalletscontainmoney
Therearevariousaspectsthatgointomakingasuccessfulschoolandsuccesscanbemeasuredinvariousways.Oftentheteachersarepraisedforaschool'ssuccessandblamedforitsfailure.Yetinorderforaschooltobeeffectiveitmustbeaplacewhereteachingandlearningcaneasilytakeplaceandthatrequiresthehardworkofmorethanjusteducators.Studentsmusttakelearningintotheirownhandsandfeelasifwhattheyaredoingisasimportantasitactuallyis.Thiscanonlybedonewiththecooperationofeveryadultthatisinvolvedinthestudents'life.Someoftheseindividualsoftengounnoticedyettheroletheyplayinthestudents'livesisimmeasurable. Intheschooladministrativeassistantsgreetstudentsatthestartofthedayandansweralargequantityofquestions.Whenanassistantremembersastudent'snameorevensomethingspecialaboutthatstudentitcommunicatestohimthatheiscaredfor.Theassistantcanalsogivethatextraencouragementforastudenttomakebetterchoicesespeciallywhentheyarevisitingtheprincipal'soffice. Meanwhilethoughcafeteriaworkershaveashortspaceoftimetointeractwithstudentstheycanmakeabigdifferenceaswell.Beyondmeetingnutritionalneedscafeteriaworkersmayalsoonoccasionmeettheemotionalneedsofthestudentstheyserve.Studentsbenefitfrompositiveinteractionwithadultsandcafeteriaworkersmaygivethatextrabitofencouragementthatachildneeds. Custodians管理员areusuallyunderappreciatedforwhattheyoffertoschools.Theyhavetobeknowledgeableabouteverythingfromcleaningtofixingthemostintricate复杂的tools.Theygettoschoolearlyinthemorningbeforeteachersarriveandlockuplateatnightafterthelaststudenthasleftfromtheafter﹣schoolevent.Theyalsomakesureteachersareequippedwiththenecessaryitemsandpreparetheroomssothattheyarereadyforlearning.Agreatcustodianalsogivesthatkindwordorextrasmiletothatstudentwhoneedsitmost. 1.Thepurposeofthepassageisto. A.emphasizetheroleteachersplayinaschool B.highlightthecontributionsofotherstaffatschoolbesidesteachers. C.telluswhomakethegreatestcontributionstoaschool D.explainwhatcontributestothesuccessofastudent 2.Ifanassistantremembersastudent'snamethestudentwillfeelthat. A.heispaidparticularattentionto B.heisspecial C.hehasdonesomethingwrong D.hehasmadeprogressinstudy 3.WhichofthefollowingisTRUEaboutcafeteriaworkers? A.It'senoughforthemtocookforthestudents. B.It'shardforthemtointeractwiththestudents. C.Theyhavethemostinteractionwithstudentsatschool. D.Theycanalsomeettheemotionalneedsofthestudents. 4.Howdoestheauthorfeelaboutthestaffmentionedinthetext? A.Disappointed. B.Dissatisfied. C.Appreciative. D.Doubtful.
﹣﹣﹣Youwantcreamandsugarinyourcoffee? ﹣﹣﹣ A.Asyoulike B.Yesplease C.Pleasedo D.Yeswithpleasure
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