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如图,轻弹簧的左端固定在竖直固定挡板上,右端连接物块,系统能够恰好静止在P点,弹簧处于压缩状态,物块处于静止状态.现用一水平向右的恒力F作用在物块上,恒力大小为滑动摩擦力的2倍,以x表示物块离开静止...
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高三下学期物理《》真题及答案
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如图所示一块质量为M.的木板停在光滑的水平面上木板的左端有挡板挡板上固定一个小弹簧一个质量为m的小物
弹簧的劲度系数
弹簧的最大弹性势能
木板和小物块之间的动摩擦因数
木板和小物块组成的系统最终损失的机械能
如图所示一块质量为M.的木板停在光滑的水平面上木板的左端有挡板挡板上固定一个小弹簧一个质量为m的小物
弹簧的劲度系数
弹簧的最大弹性势能
木板和小物块之间的动摩擦因数
木板和小物块组成的系统最终损失的机械能
如图所示小车的质量为M木块的质量为m它们之间的最大静摩擦力为f一轻质弹簧的劲度系数为k左端固定在挡板
如图所示竖直放置的轻弹簧一端固定在地面上另一端与斜面体P.连接P.的斜面与固定挡板MN接触且处于静止
2个
3个
4个
5个
如图所示一质量为m的小物体固定在劲度系数为k的轻弹簧右端轻弹簧的左端固定在竖直墙上水平向左的外力F.
如图所示竖直放置的轻弹簧一端固定在水平地面上另一端与斜面体P相连P与固定的光滑倾斜挡板MN接触处于静
2个
3个
4个
5个
如图9所示轻弹簧左端固定在竖直墙上右端点在O.位置质量为m的物块A.可视为质点以初速度v0从距O.点
如图所示竖直放置的轻弹簧一端固定在地面上另一端与斜面体P.连接P.的斜面与固定挡板MN接触且处于静止
2个或3个
3个或4个
4个或2个
5个或4个
如图所示一块质量为M.的木板停在光滑的水平面上木板的左端有挡板挡板上固定一个小弹簧一个质量为m的小物
弹簧的劲度系数
弹簧的最大弹性势能
木板和小物块之间的动摩擦因数
木板和小物块组成的系统最终损失的机械能
如图所示半径为R的四分之三光滑圆弧轨道BCD固定在竖直面内最低点B与水平面平滑相切BC为直径.一根
如图所示质量为M.的木板静止在光滑水平面上右端有一个固定在木板上的挡板D.挡板上固定一个轻弹簧将一个
位置。如果把木板固定在水平地面上,再将小物块放在弹簧的左端,将弹簧压缩到上述同样程度,并用细线拴住,再烧断细线,则下列说法正确的是
A.小物体最终仍停在A.点
小物体最终停在A.点右侧某位置
小物体最终停在A.点左侧某位置
小物体最终停在哪个位置由M.,
大小关系决定
如图所示将两个相同的木块ab置于固定在水平面上的粗糙斜面上ab中间用一轻弹簧连接b的右端用细绳与固定
a所受的摩擦力一定不为零
b所受的摩擦力一定不为零
细绳剪断瞬间,a所受摩擦力不变
细绳剪断瞬间,b所受摩擦力可能为零
2017河南天一大联考如图所示斜面体B.固定在水平面上物体
静置茬
上,且A.的左端连接一轻质弹簧,弹簧左端要固定在竖直挡板上.现水平左右移动挡板,A.始终在斜面体B.上静止.斜面体B.的倾角θ=30°,物体A.的质量为m,移动过程中弹簧始终处于水平压缩状态.则下列说法正确的是( )
A.A.B.之间的接触面可能是光滑的 B.弹簧弹力越大,A.B.之间的摩擦力越大
A.B.之间的摩擦力为0时,弹簧弹力为
mg
当弹簧弹力为
mg时,A.所受摩擦力大小为mg
如图所示一块质量为M.的木板停在光滑的水平面上木板的左端有挡板挡板上固定一个小弹簧一个质量为m的小物
弹簧的劲度系数
弹簧的最大弹性势能
木板和小物块之间的动摩擦因数
木板和小物块组成的系统最终损失的机械能
如图所示左右带有固定挡板上表面光滑的长木板放在水平桌面上一质量M=1.0kg的物体A右端与一轻弹簧连
物体A受到5个力的作用
物体A对左侧挡板的压力等于3N
运动过程中弹簧的最大形变量是最小形变量的2倍
弹簧弹性势能的减少等于A物体动能的增加
如图所示竖直放置的轻弹簧一端固定在地面上另一端与斜面P.连接P.与斜放的固定挡板MN接触且处于静止状
5 个
4 个
3 个
2 个
如图质量为M.的长木板静止在光滑水平地面上在木板右端有质量为m的小物块现给物块一个水平向左的初速度v
如图质量为M.的长木板静止在光滑水平地面上在木板右端有质量为m的小物块现给物块一个水平向左的初速度v
如图所示竖直放置的轻弹簧一端固定在地面上另一端与斜面体P.连接P.与斜放的固定挡板MN接触且处于静止
2
3
4
5
如图所示竖直放置的轻弹簧一端固定在水平地面上另一端与斜面体P.相连P.与固定的光滑倾斜挡板MN接触处
2个
3个
4个
5个
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Myfirstlessonwasatameeting.AswesettledaroundthetableIheardMegwhowas1arecentoperationtalkingtoJudiththemanagerofourprojectThankyousomuchfor2mydaughterstotheirdancelessonlastweek.Don'tmentionitJudithsaidItwasnothing. Knowinghow3JudithwaswithherworkkidsandagingparentsIfoundherdrivingMeg'schildrentodancelessonsunbelievably4. IwasabouttosaymoreaboutthiswhenDonnaanothercolleagueenteredtheroom5. Sheapologizedforbeinglatesayingshejusthadhostedalunchforherfriendswhowereoverseventy.ThatwassoniceofyouIsaid6howshedidn'tliketocookorclean.Ohshesaidwavingher7Itwasnothing.SomehowIcouldstilltellthe8inhervoice.Shegainedasenseofsatisfactionfromtheentertainment款待offeredtoherfriends. Seeingtheir9tohelpothersselflesslyIstartedthinkingabouttheconceptofnothingthispeacefulandgenerouswayofliving﹣﹣﹣wasitreallynothingorweretheysimplysayingthat?Isuddenly10thatonceIspentawholeafternoonafterworkhelpingafriend11aspeechshewasgoingtodeliver.I12hertorearrange重新安排theorderofthestoriesinthelecturetomakeitsoundmore13.Afterthefifthtryshefinally14it.Shehuggedmewith15sayingthankstome.Ismiledandsaiditwasnothing. SuddenlyIrealizedthathelpingsomeonewasreallysomethingtome.Ilearntthatgivingfromtheheartdoesn't16meanhardwork.The17isfindingsomethingwelovetodoandfindingsomeonewho18thatsomething.Ourgenerositycan19othersaswellasourselves.Onceyouhaveagood20ofitit'snothing.Andit'sreallysomething. 1A.recoveringfrom B.adaptingto C.goingthrough D.joiningin 2A.guiding B.fetching C.driving D.dragging 3A.common B.busy C.strange D.practical 4A.frightened B.sincere C.gifted D.generous 5A.hurriedly B.disappointedly C.angrily D.unexpectedly 6A.ignoring B.knowing C.forgetting D.predicting 7A.eyes B.feet C.leg D.hand 8A.pleasure B.sadness C.surprise D.regret 9A.progress B.adventure C.promise D.willingness 10A.referred B.refused C.remembered D.respected 11A.preparefor B.putup C.giveaway D.takeapart 12A.begged B.invited C.advised D.permitted 13A.unbelievable B.reasonable C.sensitive D.puzzling 14A.got B.meant C.caught D.made 15A.concern B.worry C.gratitude D.apology 16A.normally B.accidentally C.necessarily D.possibly 17A.treat B.trick C.belief D.plan 18A.needs B.admires C.loves D.defends 19A.defeat B.benefit C.win D.regard 20A.order B.balance C.impression D.command
杜氏肌营养不良症一般在3~5岁时开始发病20~30岁因呼吸衰竭而死亡受一对等位基因Dd控制.亨廷顿舞蹈症一般在中年发病受另一对等位基因Hh控制.如图是某家族两种遗传病系谱图其中Ⅰ3不携带致病基因.请回答 1利用DNA分子杂交技术鉴定Ⅰ3是否携带致病基因的原理是. 2该家族中杜氏肌营养不良症和亨廷顿舞蹈症的遗传方式分别是. 3Ⅰ4的基因型是.Ⅱ3产生同时含有两种致病基因卵细胞的概率是. 4Ⅲ3患杜氏肌营养不良症的概率是. 5若Ⅲ2与一正常男性婚配生一男孩该男孩正常的概率是.
利用科学记数法表示的数原来各是什么数-5.002×104=
Fishingisapopularactivityandeveryfishermanknowstherule:Keepthebigonesthrowthesmalleronesback.Theideabehinditissimple﹣thelargerfishareprobablyolder.Ifyoukeepthesmalleronestheywon'tbeabletoreproduceandthefishpopulationwillbeindanger. Butfishingoutthelargestfishfromapopulationhasanunwantedeffect:Overtimefeweradultfishgetreallybig.Ifonlythesmallerfishreproducethenfuturegenerationswillbecomesmaller.Thisisanexampleofevolution进化inaction. OnescientistDr.DavidConoverhasspentthelastdecadestudyingtheeffectsofthekeepthebigonesruleandiftheycanbechanged. TosetuphisexperimentConoverandhisteamcaughthundredsofsilversidefishanddividedthemintosixgroups.FortwogroupsConoverfollowedtheukeepthelargeonesruleandtookoutthebiggestfish.Fortwoothergroupsheremovedonlythesmallfish.Forthelasttwogroupsheremovedfishatrandom随意的. Afterfiveyearshemeasuredthefishineachgroup.Inthetwogroupswherethelargestfishwereregularlyremovedtheaveragefishsizewassmallerthantheaveragesizeintheothergroups.Herewastheevolutioninaction:Ifonlysmallfishsurvivetoreproducethenfuturegenerationsoffishwillalsotendtobesmall. ForthesecondfiveyearsofhisexperimentConoverchangedtherulesandtookfishrandomlyfromeachgroup.Attheendoftheexperimenthefoundthatthefishthatwereinthekeepthelargeonesgroupforthefirstfiveyearshadstartedtogetlargeragainalthoughhecalculateditwouldtakeatleast12yearsforthefishinthatgrouptoreturntotheiroriginalsize. Inotherwordsittakeslesstimetoshrinkthanitdoestorecover. 1What'sthetraditionalruleinfishing? A.Keepbothbigandsmallones. B.Keepbigonesandfreesmallones. C.Keepsmallonesandthrowbigonesback. D.Keeptheonesthatcanreproduce. 2DavidConoverdidexperimentonfishinginorderto. A.findpracticalrulesinfishing B.provethetraditionalfishingrulewasreasonable C.seekforgoodfishestoreproduce D.findgoodmethodinraisingsilversidefish 3WhatdidDavidConoversexperimentprove? A.Fishermanshouldfishatcertaintime. B.Fishermanshouldkeepbigonesandfreesmallone. C.Fishermanshouldkeepsmallonesandthrowbigonesback. D.Fishermanshouldkeepfishatrandom. 4Whatdoestheunderlinedwordshrinkmeaninthelastparagraph? A.Becomesmaller. B.Becomeill. C.Becomeweaker. D.Becomeless.
ThefirstMondayinSeptemberisLaborDayintheUnitedStates.Thenationalholidaybeganmorethan100yearsago1honorlow﹣paidfactoryworkers. LaborDayalso2informalmarkstheendofsummer.ManystudentsreturntoschoolafterLaborDay.Thehotdaysofsummerturn3cool.ManyAmericanscelebratetheholiday4anoutdoorfamilybarbecue. ButLaborDaystartedwithastruggle.OnMay1st1889workersdemonstrated游行onthestreetsofParisFrance.InternationalLaborDaywasborn.Mostindustrialized5countryintheworld﹣excepttheUnited StatesandCanada﹣﹣celebrateLaborDayonthefirstofMay. ThefirstAmericanLaborDaycelebration6holdonSeptember5th1882inNewYorkCity.About10000workersmarchedthroughthestreetstoshowthe7strongoflabororganizations. FormanyyearsafterthatAmericanworkersusedthefirstMondayinSeptembertodemandbetterworkingconditionsandpay.Musicwasapartofmanyofthosemarchesandmanylaborsongstraditionallytellstoriesofconflictandhopesfor8betterlife.HereareWeShallNotBeMoved.WhichSideAreYouOn?BreadandRoses. EventhoughLaborDaydemonstrationsarenot9commonastheyareintheU.S.thesongremindsustocelebratetheeffortandlovethatmanypeoplegiveto10theywork.
下列关于人体内性激素的叙述正确的是
Youmayfinditexcitingtogetapart﹣timejobduringthesummervacation.1Whenyougetaninvitationtoajobinterviewyouarehalfwaytowardsyourgoal﹣﹣ajoboffer.Hereareafewthingsyoushoulddoafterwards. Respondtotheinvitationtotheinterview.Thankthesenderfortheirtimeandfortheopportunitytoorganizetheinterviewconfirmingthatyouwillbeavailableatthedeterminedtime.2. 3Youneedtodosomeresearchonthecompanyandlearnasmuchaboutthecompanyaspossiblebeforetheinterview.Usethecompany'swebsiteandnewspaperarticlestogatherasmuchinformationaspossible.Youshouldalsobereadytotalkindepthaboutthecompanyandthepositionyouareapplyingfor. 4It'sbesttoprepareforawidevarietyofquestionsbythinkingaboutyourowncareergoalsandsoon.Wheredoyouseeyourselfinfiveyears?isacommonquestion.Workingdiligentlyforyouofcourse!Butunlessyouareactuallytryingtogetajobinyourchosencareerthisprobablyisn'tagoodanswer. Practicewithafriend.5Notonlywillthisgiveyouawaytostructureyourpreparationbutitwillalsohelpyougetcomfortablewithgivinganswers.Practicegivingconcisecompleteanswersandmaintainingeyecontactwiththeinterviewerswhileyougivethem. A.Askpeoplearoundyouforhelp. B.Ifyouhaveafriendwhoisalsopreparingforaninterviewconsiderpreparingtogether. C.Ifyouneedmoreinformationabouttheinterviewthisisthetimetoask. D.Butdoyouknowhowtoprepareforajobinterview? E.Thinkaboutquestionstheinterviewerislikelytoask. F.Whatarethechancesforprofessionalgrowthinthisjobopportunity. G.Doyourhomework.
下列关于细胞生命历程的叙述正确的是
利用科学记数法表示的数原来各是什么数2×105=
如图是探究有关酶特性的实验装置将装置置于适宜温度下保温5min后向各试管中滴加斐林试剂并水浴加热2min观察试管中的颜色变化.相关叙述正确的是
科学家构建了含有大洋鳕鱼抗冻蛋白基因启动子和大鳞鲑鱼生长激素基因的表达载体并将其导入了大西洋鲑的细胞中获得了生长速度加快的转基因大西洋鲑.相关叙述正确的是
把下列数据用科学记数法表法出来地球上煤的储量估计为15万亿吨以上.
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