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如图甲所示,粗糙的斜面固定在水平地面上,一小滑块自斜面顶端由静止开始沿斜面下滑,在下滑过程中,图乙是小滑块的动能Ek随下滑的位移x的变化规律,图丙是滑块的重力势能Ep随位移x的变化规律,图丁是滑块的...
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高三下学期物理《》真题及答案
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水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为S.L1如图所示两个完全
B.(可视为质点)同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A.一直沿斜面甲滑到底端C.,而小滑块
滑到底端P.后沿水平面滑行到D.处(小滑块B.在P.点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且S=L
1
+L
2
。小滑块A.B.与两个斜面和水平面间的动摩擦因数相同,则:( ) A.滑块A.到达底端
点时的动能一定比滑块B.到达
点时的动能大 B.两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同 C.A.B.两个滑块从斜面顶端分别运动到C.D.的过程 中,滑块A.重力做功的平均功率小于滑块B.重力做功的平均功率 D.A.B.滑块从斜面顶端分别运动到C.D.的过程中,由于克服摩擦而产生的热量一定相同
2015年·抚顺重点高中模拟如图所示两个倾角分别为30°和60°的足够长的光滑面固定于水平地面上并处
甲滑块飞离斜面瞬间的速度比乙滑块飞离斜面瞬间的速度大
甲滑块在斜面上运动的时间比乙滑块在斜面上运动的时间短
甲滑块在斜面上运动的位移与乙滑块在斜面上运动的位移大小相等
两滑块在斜面上运动的过程中,重力的平均功率相等
如图甲所示斜面体静止在粗糙的水平地面上斜面体上有一小滑块
沿斜面匀速下滑,现对小滑块施加一竖直向下的作用力F.,如图乙所示两种情景下斜面体均处于静止状态,则下列说法正确的是
A. 施加力F.后,小滑块A.受到的滑动摩擦力增大
施加力F.后,小滑块A.将加速下滑
施加力F.后,地面对斜面体的支持力增大
施加力F.后,地面对斜面体的摩擦力增大
如图所示倾角为30°的粗糙绝缘斜面固定在水平地面上整个装置处在垂直斜面向上的匀强电场之中一质量为m电
如图甲所示斜面体静止在粗糙的水平地面上斜面体上有一小滑块
沿斜面匀速下滑,现对小滑块施加一竖直向下的作用力F.,如图乙所示两种情景下斜面体均处于静止状态,则下列说法
错误
的是 ( )
A.施加力F.后,小滑块A.受到的滑动摩擦力增大
施加力F.后,小滑块A.仍以原速度匀速下滑
施加力F.后,地面对斜面体的支持力增大
施加力F.后,地面对斜面体的摩擦力增大
水平地面上有两个固定的高度相同的粗糙斜面甲和乙底边长分别为L1L2且L1<L2如图所示.两个完全相同
B.(可视为质点)与两个斜面间的动摩擦因数相同,将小滑块A.
分别从甲、乙两个斜面的顶端同时由静止开始释放,取地面所在的水平面为参考平面,则( )
A. 从顶端到底端的运动过程中,由于克服摩擦而产 生的热量一定相同 B. 滑块A.到达底端时的动能一定比滑块B.到达底端时的动能大
两个滑块从顶端运动到底端的过程中,重力对滑块A.做功的平均功率比滑块B.小
两个滑块加速下滑的过程中,到达同一高度时,机械能可能相同
如图AB是高h1=0.6m倾角θ=37°放置在水平桌面上斜面下端是与桌面相切的一小段圆弧且紧靠桌子边
将一斜面固定在水平地面上在斜面上放一小滑块
,如图甲。在小滑块A.上放一小物体
,物体B.始终与A.保持相对静止如图乙;或在小滑块A.上施加一竖直向下的作用力F.,如图丙。则下列说法正确的是 A.若甲图中A.可沿斜面匀速下滑,加物体B后将加速下滑 B.若甲图中A.可沿斜面匀速下滑,加力F后将加速下滑
若甲图中A.可沿斜面匀加速下滑,加物体B.后加速度将增大
若甲图中A.可沿斜面匀加速下滑,加力F.后加速度将增大
如图21所示一上表面粗糙的斜面体放在光滑的水平地面上斜面的倾角为θ若斜面固定另一质量为m的滑块恰好能
如图19所示已知倾角为高为h的斜面固定在水平地面上一小球从高为H.h<H.<h处自由下落与斜面做无能
水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为SL1如图所示两个完全相
B可视为质点)同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A一直沿斜面甲滑到底端C,而小滑块B滑到底端P后沿水平面滑行到D处(小滑块B在P点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且S=L
1
+L
2
。小滑块A.B与两个斜面和水平面间的动摩擦因数相同,则( ) A.滑块A到达底端C点时的动能一定比滑块B到达D点时的动能小
两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同
A.B两个滑块从斜面顶端分别运动到C.D的过程中,滑块A重力做功的平均功率小于滑块B重力做功的平均功率
A.B滑块从斜面顶端分别运动到C.D的过程中,由于克服摩擦而产生的热量一定相同
水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为sL.1如图所示两个完全
B.可视为质点,同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A.一直沿斜面甲滑到底端C.,而小滑块
滑到底端P.后沿水平面滑行到D.处(小滑块B.在P.点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且s=L
1
+L.
2
。小滑块A.B.与两个斜面和水平面间的动摩擦因数相同,则( ) A.滑块A.到达底端
点时的动能一定比滑块B.到达
点时的动能小 B.两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同 C.A.B.两个滑块从斜面顶端分别运动到C.D.的过程中,滑块A.重力做功的平均功率小于滑块B.重力做功的平均功率 D.A.B.滑块从斜面顶端分别运动到C.D.的过程中,由于克服摩擦而产生的热量一定相同
水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为S.L.1如图所示两个完
B.可视为质点同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A.一直沿斜面甲滑到底端C.,而小滑块
滑到底端P.后沿水平面滑行到D.处(小滑块B.在P.点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且S.=L
1
+L
2
。小滑块A.B.与两个斜面和水平面间的动摩擦因数相同,则( ) A.滑块A.到达底端
点时的动能一定比滑块B.到达
点时的动能小 B.两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同 C.A.B.两个滑块从斜面顶端分别运动到C.D.的过程中,滑块A.重力做功的平均功率小于滑块B.重力做功的平均功率 D.A.B.滑块从斜面顶端分别运动到C.D.的过程中,由于克服摩擦而产生的热量一定相同
如图所示倾角为30°的粗糙绝缘斜面固定在水平地面上整个装置处在垂直斜面向上的匀强电场之中一质量为m电
将一斜面固定在水平地面上在斜面上放一小滑块
,如图甲。在小滑块A.上放一小物体
,物体B.始终与A.保持相对静止,如图乙。在小滑块A.上施加一竖直向下的作用力F.,如图丙。则下列说法正确的是 ( )
A.;若甲图中A.可沿斜面匀加速下滑,加力F.后加速度将增大 B.;若甲图中A.可沿斜面匀速下滑,加力F.后将加速下滑
;若甲图中A.可沿斜面匀加速下滑,加物体B.后加速度将增大
;若甲图中A.可沿斜面匀速下滑,加物体B.后将加速下滑
将一斜面固定在水平地面上在斜面上放一小滑块
,如图甲。在小滑块A.上放一小物体
,物体B.始终与A.保持相对静止如图乙;或在小滑块A.上施加一竖直向下的作用力F.,如图丙。则下列说法正确的是 A.若甲图中A.可沿斜面匀速下滑,加物体B.后将加速下滑 B.若甲图中A.可沿斜面匀速下滑,加力F.后将加速下滑
若甲图中A.可沿斜面匀加速下滑,加物体B.后加速度将增大
若甲图中A.可沿斜面匀加速下滑,加力F.后加速度将增大
水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为SL1如图所示两个完全相
B可视为质点)同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A一直沿斜面甲滑到底端C,而小滑块B滑到底端P后沿水平面滑行到D处(小滑块B在P点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且S=L
1
+L
2
。小滑块A.B与两个斜面和水平面间的动摩擦因数相同,则( ) A.滑块A到达底端C点时的动能一定比滑块B到达D点时的动能小
两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同
A.B两个滑块从斜面顶端分别运动到C.D的过程中,滑块A重力做功的平均功率小于滑块B重力做功的平均功率
A.B滑块从斜面顶端分别运动到C.D的过程中,由于克服摩擦而产生的热量一定相同
如图所示AB是高h1=0.6m倾角θ=37º的斜面固定在水平桌面上斜面下端是与桌面相切的一小段圆弧且
水平地面上有两个固定的高度相同的粗糙斜面甲和乙乙的斜面倾角大甲乙斜面长分别为SL1如图所示两个完全相
B可视为质点)同时由静止开始从甲、乙两个斜面的顶端释放,小滑块A一直沿斜面甲滑到底端C,而小滑块B滑到底端P后沿水平面滑行到D处(小滑块B在P点从斜面滑到水平面的速度大小不变),在水平面上滑行的距离PD=L
2
,且S=L
1
+L
2
。小滑块A.B与两个斜面和水平面间的动摩擦因数相同,则( )
A.滑块A到达底端C点时的动能一定比滑块B到达D点时的动能小
两个滑块在斜面上加速下滑的过程中,到达同一高度时,动能可能相同
A.B两个滑块从斜面顶端分别运动到C.D的过程中,滑块A重力做功的平均功率小于滑块B重力做功的平均功率
A.B滑块从斜面顶端分别运动到C.D的过程中,由于克服摩擦而产生的热量一定相同
一表面粗糙的斜面放在光滑的水平地面上如图4所示θ为斜面倾角.斜面固定时一质量为m的滑块恰好能沿斜面匀
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NeedaJobThisSummer? Theprovincialgovernmentanditspartnersoffermanyprogramstohelpstudentsfindsummerjobs.Thedeadlinesandwhatyouneedtoapplydependontheprogram. Notastudent?Gotothegovernmentwebsitetolearnaboutprogramsandonlinetoolsavailabletohelppeopleunder30buildskillsfindajoborstartbusinessesallyearround. JobsforYouth Ifyouareateenagerlivingincertainpartsoftheprovinceyoucouldbeeligible符合条件forthisprogramWhichprovideseightweeksofpaidemploymentalongwithtraining. WhoiseligibleYouth15﹣18yearsoldinselectcommunities社区. SummerCompany SummerCompanyprovidesstudentswithhands﹣onbusinesstrainingandawardsofupto$3000tostartandruntheirownsummerbusinesses. WhoiseligibleStudentsaged15﹣29returningtoschoolinthefall. StewardshipYouthRangerProgram YoucouldapplytobeaStewardshipYouthRangerandworkonlocalnaturalresourcemanagementprojectsforeightweeksthissummer. WhoiseligibleStudentsaged16or17attimeofhirebutnotturning18beforeDecember31thisyear. SummerEmploymentOpportunities机会 ThroughtheSummerEmploymentOpportunitiesprogramstudentsarehiredeachyearinavarietyofsummerpositionsacrosstheProvincialPublicServiceitsrelatedagenciesandcommunitygroups. WhoiseligibleStudentsaged15orolder.Somepositionsrequirestudentstobe15to24orupto29forpersonswithadisability. 1WhatisspecialaboutSummerCompany? A.Itrequiresnotrainingbeforeemployment. B.Itprovidesawardsforrunningnewbusinesses. C.Itallowsonetoworkinthenaturalenvironment. D.Itoffersmoresummerjobopportunities. 2WhatistheagerangerequiredbyStewardshipYouthRangerProgram? A.15﹣18. B.15﹣24. C.15﹣29. D.16﹣17. 3Whichprogramfavorsthedisabled? A.JobsforYouth. B.SummerCompany. C.StewardshipYouthRangerProgram. D.SummerEmploymentOpportunities.
Humansmakemistakes.Evensurgeonswithyearsofexperiencearenotinfallible.Butwhatifthesedoctorscouldpooltheirknowledgeandexperiencetogetherandcreateasurgicalstandardofcaretobecarriedoutbymachines? That'stheideabehindsurgicalrobotswhichmaysoonperformmostsurgeriesfromsewinguptinywoundstoperformingheartprocedures.Manyoftheseoperationsareinfactalreadycompletedwiththeassistanceofrobots.Butarecenttestsuggeststhatrobotsintheoperatingroommaysoongoastepfurtherperformingonsofttissuecompletelyontheirownfromstarttofinish. TheSmartTissueAutonomousRobotSTARsuccessfullycompletedsurgeriesonpigs.We'rethefirstgrouptodevelopautonomousroboticsurgerywithsoft﹣tissuesurgeryandwhencomparedtostandardoperationit'sbettersaysPeterKimprofessorofsurgery.Theideaisnottoreplacesurgeonsitwillmakethesurgeonsbetterandmaketheproceduressafer. ArecentMayoClinicstudyfoundthatmajorsurgicalerrors﹣includingoperatingonthewrongsiteorsideofthebodyorevenleavingtoolsorobjectsinsidethepatient﹣occureveryoneoutof22000procedures.That'srarebutrobotslikeSTARwouldaimtolowerthenumberevenfurther. InthedaVincisurgicalsystemsurgeonsplacetheirarmsinsideinstrumentsandusetheirhandstocontrolthemovementofrobotictoolsontheoperatingtablefromafar.Therobot'severymajormoveiscontrolledbysurgeonsandthusitsresultsmayvarybasedonthesurgeon'strainingorexperience. STARontheotherhandisentirelyautonomous.It'snotonlyabletoworkonitsownandperformsurgerieswithamoreflexiblehandbutit'sabletoreacttotheunexpectedincidents.Cuttingintohardtissuelikebonesisonethingbutoperatingonmovingsofttissueisfarmorecomplex.STARreactstoachangingenvironmentsimilartohowself﹣drivingcarsareprogrammedtonotonlydriveonthehighwaybutalsoreacttoanotherdrivermakingamistakeandgettinginyourway. 1TheunderlinedwordinfallibleinParagraph1probablymeans. A.quitesmart B.reallycreative C.ratherresponsible D.alwaysright 2WecanlearnfromthepassagethatSTAR. A.canperformtheoperationonitsown B.hasbeenwidelyusedintheoperatingroom C.canmakesurgeriesmuchfaster D.willtaketheplaceofsurgeons 3InthedaVincisurgicalsystem. A.robotsaretrainedfromafar B.robotsalwaysmakemistakes C.surgeryresultsdependonsurgeons D.surgeonshavetroublecontrollingrobots 4Inthelastparagraphtheauthormentionsself﹣drivingcarsinordertoshow. A.howsmartanautonomousrobotcanbe B.howdifficultself﹣drivingonthehighwayis C.howbadgettinginanotherdriver'swaymightbe D.howdangerousoperatingonpeopleis.
30分 AGoodMan It'salateSaturdayafternooninearlyMarchandIamsweatinginsearchoftheonlygiftmysonwantsfromLosAngelesa1tothehomesofthestarssuchasBradPittandJetLi. AcheerfultaxidriversaysNoproblem.Mapsellersareeverywhere!Whenthetaxistopsafellow2withathinfoldedsheetandsaysTendollars. Tendollars!Withabsolute3IinformhimThat'stoomuch.Themapmanleaves.IbeginwalkingcertainI'llfindaan4starmapsoon. Iam5.There'shardlyanybodyonthestreet.Theredon'tseemtobemanyrealstoresjustcarsandbars.Nomaps.Nostars.Blockspass.Thesunbeginstosink.Atthe edgeofWestHollywood6fellowwandersaheadsellingstarmapstosometeenagegirls. Tendollars7.Forgetit.Mysonwill8. ThatnightIcallmywife.Didyougetoneofthosemapstothestars?He'sbeentalkingabout9else. This10ishardtoignore.It'slate.Atall﹣nightmarketsnomaps.Iheadbacktothehotel.Morningiscoming.Therewillbeonelast11.AfterIcheckoutItakeataxi.Butatnineinthemorningmapsellersare12tobefound. YouknowsaysthedriverTheguyswiththemapsjustaren'tupyet!He'sright. Forgetit.Let'sgototheairport. WellsaysthedriverIcould13youoneifyoulike. Sure.Trustthisguy?Imightaswellthrowcashontothefreeway.ButexitingthetaxiI14mylastchance.Ihandhim$13andmybusinesscard.Threeweekspass.I've15onthestarmap.Mysonhasstoppedmentioningit. Thenoneafternoonstickingoutfromunderpilesofflyersthereitisabigwhiteenvelope.Thereisasmallnote.Icanhardlyreadit16Imakeoutafewphrases﹣forgive17taxi'sbeendownandfinallyhere'smapforyourson.There'snoreturnaddress.It'ssignedkindregardsM. Iholdthenoteinmyhand18whatmysonsaidtomewhenIgotbackfromLosAngeles. Didyoumeetany19Dad?heasked. NowIknowwhattotellhim. YesIdid.ImetaguynamedM. Ifyounever20anybodyyou'llneverfindthegoodguys. 1A.decoration B.map C.book D.symbol 2A.argues B.requests C.competes D.approaches 3A.assurance B.permission C.anxiety D.bargain 4A.perfect B.inexpensive C.proper D.detailed 5A.shocked B.confused C.impatient D.wrong 6A.any B.some C.another D.either 7A.still B.even C.almost D.yet 8A.believe B.regret C.understand D.admit 9A.anything B.everything C.something D.nothing 10A.idea B.news C.change D.reason 11A.try B.journey C.action D.minute 12A.everywhere B.somewhere C.anywhere D.nowhere 13A.give B.mail C.show D.spare 14A.create B.recognize C.deserve D.blow 15A.givenup B.throwndoubts C.refusedoffers D.droppedin 16A.and B.or C.but D.for 17A.fault B.delay C.carelessness D.rudeness 18A.remembering B.reminding C.reviewing D.realizing 19A.admirers B.friends C.stars D.heroes 20A.lookupto B.turnto C.havefaithin D.agreewith
如图如图1中两个被固定的点电荷Q1Q2连线的延长线上有ab两点.Q1带正电检验电荷+q仅受电场力作用t=0时恰经过b点然后沿ba向右运动其v﹣t图象如图2.则Q2带电从b到a的过程中q的电势能变化情况是.
25分假定你是李华暑假在伦敦学习得知当地美术馆要举办中国画展.请写一封信申请做志愿者内容包括 1.写信目的 2.个人优势 3.能做的事情. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.结束语已为你写好.
15分ThepolarbearisfoundintheArcticCircleandsomebiglandmassesasfarsouthasNewfoundland.Whiletheyarerarenorthof88°thereisevidence1theyrangeallthewayacrosstheArcticandasfarsouthasJamesBayinCanada.Itisdifficulttofigureoutaglobalpopulationofpolarbearsasmuchoftherangehasbeen2poorstudiedhoweverbiologistscalculatethatthereareabout20000﹣25000polarbearsworldwide. Modernmethods3trackingpolarbearpopulationshavebeenemployedonlysincethemid﹣1980sandareexpensive4performconsistentlyoveralargearea.InrecentyearssomeInuitpeopleinNunayut5reportincreasesinbearsightingsaroundhumansettlementsleadingtoa6believethatpopulationsareincreasing.Scientistshaverespondedby7notethathungrybearsmaybecongregating聚集aroundhumansettlementsleadingtotheillusion错觉thatpopulationsare8highthantheyactuallyare.Of9nineteenrecognizedpolarbearsubpopulationsthreearedecliningsix10bestableoneisincreasingandninelackenoughdata.
30分Itwasmyfirstyearofgraduateschoolandmyprofessorwasstandingontheplatform.Hewastellingusabouta1hemadeyearsago. Aboutadecadeearliermyprofessorhadbeenasalesmanageratalargecompany.Theywere2anationalcampaignandpreparingforamajorbrandlaunch.Myprofessorwas3theoperation. Foralmosttwomonthsbeforethelaunchdayhewas4alloverthecountrytotalkwithmajorpartners.5crossingthecountryonflightshewasalsotryingto6hisdepartment.Forweekshewouldhavemeetingsalldayanswer7andphonecallsallnightand8threeorfourhoursofsleep. Theweekbeforethebiglaunchdayhisbody9.Hehadtoberushedtothehospital.Majororganshadstartedto10fromthelong﹣termstress.Hespentthenexteightdaysinhospital11todoanythingasthelaunchdaycameandwent. Imaginethatyour12andenergyareabucketofwater.Inyourdailylifetherearethingsthat13yourbucketup.Theseareinputslikesleepnutritionlaughterandotherformsof14.Therearealsoforcesthatdrain使排出thewaterfromyourbucket.Theseare15likestressfromworkorschoolrelationshipproblemsorotherformsofanxiety. Theforcesthatdrainyourbucketaren'tall16.Toliveaproductivelifeitcanbeimportanttohavesomethings17outofyourbucket.Workinghardinthegymatschoolorattheofficeallowsyoutoproducesomething18.Butpositiveoutputsarestilloutputsandtheydrainyourenergy19.Theseoutputsaregradual.Evenalittleleakcanresultinsignificantwaterloss20time. 1A.prediction B.decision C.fortune D.mistake 2A.attheendof B.inthemiddleof C.atthemercyof D.onthewayto 3A.sponsoring B.leading C.assisting D.adopting 4A.researching B.driving C.flying D.inspecting 5A.Before B.Though C.While D.Since 6A.run B.promote C.expand D.observe 7A.emails B.charges C.problems D.doors 8A.pullin B.squeezein C.takein D.bringin 9A.giveup B.givein C.giveout D.giveaway 10A.disappear B.suffer C.function D.fail 11A.ready B.unwilling C.eager D.unable 12A.health B.status C.success D.reputation 13A.break B.pack C.fill D.cover 14A.rest B.recovery C.entertainment D.accommodation 15A.restrictions B.consequences C.examples D.outputs 16A.uncontrollable B.unpredictable C.uncomfortable D.unfavorable 17A.flowing B.slipping C.escaping D.growing 18A.typical B.valuable C.casual D.exotic 19A.suddenly B.surprisingly C.partly D.thoroughly 20A.over B.beyond C.after D.before
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号并在其下面写出该加的词. 删除把多余的词用斜线划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. InrecentyearstherehavebeenmoreandmoreConfuciusInstitutesbeingbuiltallovertheworldthatshowsourChineseculturehasbeenbecomemuchmorepopularthanever.AsoneoffourancientcivilizationsChinacreatesmanysplendidcultureswithinitslonghistory.TheancientChinesecultureoncehadgreatinfluencesintheworld'scivilizationespeciallyinJapanSouthKoreaandotherAsiancountry.TheChinesecultureisslowaccumulatedinthewholeChinesehistorymadeitcolorfulandbrilliant.IfonewanttoknoworstudyChineseculturemoredeeplyheorshemustspendmuchtime.Thereforeheorshecanonlygetthetipofaniceberg.
布朗运动实验得到某个观察记录如图该图反映了
有四个电源电动势均为6V内阻分别为0.5Ω1Ω2Ω3Ω.选择其中一个电源对阻值为2Ω的电阻R供电为使R上获得的功率最大选择的电源其内阻为
10分WhenIfirstcametoUKfromChinaat6Ienteredthefirstgrade.1.Isawchildrenthrowtheirleftoverfoodintothelargetrashcans﹣fromhalf﹣eatenpizzastountouchedburgers.Iwatchedthempourtheirmilkintoawhitebucket.InChinathiswasahugeno﹣noinschool.Wehadtofinisheverything. Onedaymyfirstgradeteacherannouncedthatwewouldbehavingapartyandeveryonewastoldtobringsomethingfromtheircountry.2.Mymomstayedupafterherlongdayofworkandmademanydumplings.SheputtheminthefridgeandwokeupearlyinthemorningtosteamthemandfrythemsotheywouldtasteextrafreshwhenIbroughtthemtoschool.Theysmelledgreatandlookedgoldenbrownaftertheywerecooked. Iwassoexcitedtosharethesewithmyclassandteachers.Itwasplacedinthecornerofthetablenexttoalltheotherdeliciousfood.3.OneortwokidsbravelytookapieceandknewwhattheywerebecausetheyhaditwiththeirparentsataChineserestaurant.Attheendofthepartyitwascleanup.MyteacherwalkeduptomeandaskedpointingtothedumplingsWouldyouliketotakethesehome?IcarefullyrepliedNo…4.IthoughtshewasgoingtoshareitwithotherteachersbutimmediatelyafterIsaidthatshethrewallthedumplingsintothetrashandcontinuedcleaning.Iwasconfusedwhatjusthappened? 5.AndtodayIstillwitnessthisfrequentlyinmyEnglishfiends.Pleaseeatallyourfoodortakeittogoorshareitorjustgetenoughsoyoudon'thavetothrowitaway.Thankyou. A.InChinanousuallymeansyes B.Igotsuperexcitedandtoldmyparents C.Itwasveryimpolitetotakeyourgifthome D.ThiswasthebiggestcultureshockIhaveexperienced E.WhenIgothomeIsharedtheexperiencewithmyparents F.Manykidshadthecookiesandjuicesandwerehesitanttotrythedumplings G.Ididn'tunderstandwhykidsweregettingtheirlunchfoodandnotfinishingit
15分Maybeyouhavethemostpowerfulpassportintheworldorperhapsyoucarrythe1rare.Nomatterthecaseyourpassportwill2possiblebeoneoffourcolorsbluegreenredorblack.Whatgives? Whiletherearenospecific3ruleaboutpassportcolorscountriesdofollow4certainsetofstandardswhendesigningthem.TheInternationalCivilAviationOrganizationICAOwhichworkstorecommendtheprinciplesofairtravel5suggestthatcountriesuseaspecifictypefaceandtypesizefor6officedocumentslikepassports. AdmittedlythereareafewcompulsoryaspectsoftheseinternationalIDs.Passports7requiretobemadeoutofamaterialthatbendsinordertopreventwrinklesforexample.Theyalsoneedtobereadbyamachineattemperatures8ragefrom14°Fto122°F. Nothingstipulates规定thecovercolorexceptheexistingrecommendationsfortheseinternationaldocuments.Passportshadesaren'tjustselected9randomthough.Mostcountiessillchosetousesimpledarkshadesofredgreenandblue.Why?Notonlydodarkcolorslookmoreformal10theycanhidedirtandwear.
6分SUPPORTWORKER Doyouhavetheabilitytocareforothers?Canyouunderstandhowolderpeoplefeel?Areyouagoodcommunicator?Doyouhavegoodlisteningskills?Canyouworkweekends? IfyouhaveansweredYEStotheabovewewouldliketohearfromyou ☆Startingrateof£8.56perhour ☆Freeuniform ☆Excellenttraining careers@golden﹣care.com WOWEEMAGAZINE WritersWanted WoweeMagazineislookingforwritersforitswebsite.Payisbasedonthenumberofpeoplewhoreadyourarticles.Youmayalsoreceivefreeticketstoeventsandfreeproductstotest.Thisisagreatopportunitytogetvaluableworkexperience. Wewantpeoplewhoarechattyinterestingpassionateskilled Contactusatinfo@wowee.com. CALLINGALLMODELS Thinkyoucouldbeamodel?Ifsowe'dliketomeetyou! Workingasasuccessfulfashionmodelisn'teasybutitisveryexcitingandcouldbeagreatopportunity. Girlsshouldbeover16withaminimumheightof172cmandboysshouldhaveaminimumheightof182cm.Ifyouareunder16anddonotyethavetherequiredheightwewouldstillbeinterestedinmeetingyoubutyoumustbringaparent. info@top﹣model﹣agency.uk WORKFORCOFFEEBEANS JoinBritain'snumberonecafeatCoffeeBeanswhereeverycafehasthesameaimstocreatefamily﹣liketeamsandtogiveexcellentcustomerservice. ManydifferentkindsofpeoplecomeandworkwithussostartyourcareeratCoffeeBeanstoday ☆Choosethehoursyouwork ☆Getmanagementexperience ☆Shareyourloveofcoffee JoinusasaTeamMemberAssistantManagerofCafeManagerdependingonyourskillsandexperience. Emailusatjobs@coffeebeans.co.uk. 1Whichaddressshouldyouemailatifyouwanttobeasupportworker? A.info@wowee.com B.jobs@coffeebeans.co.uk C.careers@golden﹣care.com D.info@top﹣model﹣agency.uk 2AwriterworkingforWoweeMagazinecan. A.getafreeuniform B.receivefreeticketstoevents C.bringaparent D.chooseworkinghours 3Whatcanwelearnaboutthejobsfromthejobpostings? A.Themodelopportunityisonlymeantforadults. B.Thereisnoneedtobetrainedasasupportworker. C.EmployeesatCoffeeBeanshavefewmanagementopportunities. D.ApplicantstoWoweeMagazineareexpectedtobesociableandenthusiastic.
实验小组在做“验证机械能守恒定律”实验时提出了两种方案甲方案为让小车沿倾斜的木板下滑然后测量相关物理量乙方案为将小球用细长绳悬挂固定后使小球摆动然后测量相关物理量 1你建议选择的方案是填“甲”或“乙”理由是. 2若实验小组选用了乙方案实验装置如图所示.实验中用于测量小球速度的传感器可选用传感器. 3实验前已测得DCBA各点高度分别为0m0.050m0.100m0.150m.某同学获得的实验数据如下表分析表中数据发现从B到C到D机械能逐渐减小其原因是. 次数 D C B A 高度h/m 0 0.060 0.100 0.150 速度v/m/s 1.878 1.616 1.299 0 势能Ep/J 0 0.0039 0.0078 0.0118 动能Ek/J 0.0141 0.0104 0.0067 0 机械能E/J 0.0141 0.0144 0.0146 0.0118 4表中A点的机械能数据明显偏小其原因可能是摆锤的释放点A点选填“高于”“低于”
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词2.只允许修改10处多者从第11处起不计分. DearSir/Madam I'mwritinginresponsetoyouradvertisementintheBingleyTimesinMarch2nd.I'mveryinterestinginjoiningyourDanceclassesandwouldbegratefulunlessyoucouldanswerafewquestionsIhave. Youradvertisementstatesthatanumberintheclasseswaskepttoaminimum.Howmuchpeoplearethereineachclass?AsIworkeverydayuntil5o'clockIwouldalsoliketoknowthetimesoftheclasses.InadditionI'dliketoknowifIneedanyspecialshoesfortheclassesandI'dgreatlyappreciateifyoucouldtellmewheretobuyanynecessaryequipments.Finallyasit'smyintentiontoattendtotheseclassesregularlycouldyoualsosendmedetailsofpricesormembershipfees? Thankyouforyourkindattention.Pleasereplyatyourearliestconvenience. Yoursfaithfully ElaineRichards
在锐角△ABC中内角ABC的对边分别为abc且=a. 1求角A 2若△ABC的面积为求实数λ的范围.
如图“离心转盘游戏”中设游客与转盘间的滑动摩擦系数均相同最大静摩擦力等于滑动摩擦力.当转盘旋转的时候更容易发生侧滑向外偏离圆周轨道的是
如图倾斜固定放置的“Π”形光滑金属导轨位于与水平面成θ角的平面内导轨宽为L电阻不计.宽度均为d的矩形有界匀强磁场ⅠⅡ方向垂直导轨平面向下磁感应强度大小均为B两磁场间的距离也为d.质量为m电阻为R的金属杆ab平行于导轨顶部从距离磁场Ⅰ上边缘h处由静止释放.已知金属杆进入磁场Ⅰ和Ⅱ时的速度相等且始终与导轨接触良好重力加速度为g. 1求金属杆刚进入磁场Ⅰ时的速度v大小 2定性分析金属杆穿过两磁场的过程中能量是如何变化的 3分析并说明金属杆释放处与磁场Ⅰ上边缘的距离h需满足的条件 4作出金属杆从进入磁场Ⅰ到离开磁场Ⅱ这一过程中的v﹣t图象.
8分Asdataandidentitytheftbecomesmoreandmorecommonthemarketisgrowingforbiometric生物测量technologies﹣likefingerprintscans﹣tokeepothersoutofprivatee﹣spaces.Atpresentthesetechnologiesarestillexpensivethough. ResearchersfromGeorgiaTechsaythattheyhavecomeupwithalow﹣costdevice装置thatgetsaroundthisproblemasmartkeyboard.Thissmartkeyboardpreciselymeasuresthecadence节奏withwhichonetypesandthepressurefingersapplytoeachkey.Thekeyboardcouldofferastronglayerofsecuritybyanalyzingthingsliketheforceofauser'stypingandthetimebetweenkeypresses.Thesepatternsareuniquetoeachperson.Thusthekeyboardcandeterminepeople'sidentitiesandbyextensionwhethertheyshouldbegivenaccesstothecomputerit'sconnectedto﹣regardlessofwhethersomeonegetsthepasswordright. Italsodoesn'trequireanewtypeoftechnologythatpeoplearen'talreadyfamiliarwith.Everybodyusesakeyboardandeverybodytypesdifferently. Inastudydescribingthetechnologytheresearchershad100volunteerstypethewordtouchfourtimesusingthesmartkeyboard.Datacollectedfromthedevicecouldbeusedtorecognizedifferentparticipantsbasedonhowtheytypedwithverylowerrorrates.Theresearcherssaythatthekeyboardshouldbeprettystraightforwardtocommercializeandismostlymadeofinexpensiveplastic﹣likeparts.Theteamhopestomakeittomarketinthenearfuture. 1Whydotheresearchersdevelopthesmartkeyboard? A.Toreducepressureonkeys. B.Toimproveaccuracyintyping. C.Toreplacethepasswordsystem. D.Tocutthecostofe﹣spaceprotection. 2Whatmakestheinventionofthesmartkeyboardpossible? A.Computersaremucheasiertooperate. B.Fingerprintscanningtechniquesdevelopfast. C.Typingpatternsvaryfrompersontoperson. D.Datasecuritymeasuresareguaranteed. 3Whatdotheresearchersexpectofthesmartkeyboard? A.It'llbeenvironment﹣friendly. B.It'llreachconsumerssoon. C.It'llbemadeofplastics. D.It'llhelpspeeduptyping. 4Whereisthistextmostlikelyfrom? A.Adiary. B.Aguidebook. C.Anovel. D.Amagazine.
闭合电路中电源的电动势为12V外电压为10V当有2C电量通过电路时该电路中的能量转化情况是非静电力把J的其他形式能量转化为电能静电力把J的电能转化为其他形式能量电源消耗了J的电能.
链式反应中重核裂变时放出的可以使裂变不断进行下去的粒子是
汽车在平直公路上直线行驶发动机功率保持恒定行驶时所受的阻力恒定其加速度a和速度的倒数图象如图.若已知汽车的质量根据图象信息不能求出
做竖直上抛运动的物体在任意相等时间内速度的变化量
某市准备建一个如图所示的综合性休闲广场已知矩形广场的总面积为2000平方米其中阴影部分为通道通道的宽为1米中间的两个小矩形完全相同. 1用矩形的宽x米表示中间的三个矩形的总面积S平方米的函数关系式并给出定义域 2当矩形的宽为何值时S取得最大值并求出最大值.
Anewstudyhasshownhowcomputersandrobotspoweredbyartificialintelligencecanreadhumaneyemovementstoreadhumanpersonalities. Theeyestheysayarethewindowstothesoul.Andifthatistruecomputersandrobotspoweredbysophisticatedartificialintelligencealgorithms算法maysoonhavetheabilitytopeerintoyoursoul.ThatistheresultofanewstudyontheconnectionbetweeneyemovementsandpersonalityconductedbyneuroscienceresearchersbasedattheUniversityofSouthAustraliaandPublishedinthescientificJournalFrontiersinNeuroscience. EyemovementsduringaneverydaytaskpredictaspectsofourpersonalitywrotetheresearchersledbyUniversityofSouthAustralianeuroscientistTobiasLoetscherwhoseteamfollows42studysubjectsaroundtheuniversitycampusrecordingtheireyemovementsthendeterminestheirpersonalitytraits特点withwell﹣establishedquestionnairesfordeterminingpersonalitytypeaccordingtoasummaryofthestudypublishedbythesiteScienceDaily. TheresearchersfedthedataintotheirAlalgorithmsandfoundthatcomputersrunningthealgorithmswereabletorecordhumaneyemovementsandimmediatelydetermineaperson'smajorpersonalitytraitssuchasneuroticismextraversion外向agreeablenessconscientiousnessaswellasperceptualcuriositythescientistswrote. Thenewfindingscouldimprovethewayhumanbeingsinteractwiththeircomputersandotherhigh﹣techdevicesevenrobotsallowingformorenaturalandrealisticsocialinteractionswithmachinesLoetschersaid. Peoplearealwayslookingforimprovedpersonalizedservices.Today'srobotsandcomputersarenotsociallyawaresotheycannotadapttonon﹣verbalinformationLoetschersaidinastatementquotedbyIndianExpress.Thisresearchprovidesopportunitiestodeveloprobotsandcomputerssothattheycanbecomemorenaturalandbetteratinterpretinghumansocialsignals. ThestudyrevealedpreviouslyundiscoveredrelationsbetweenspecificpersonalitycharacteristicsandspecificeyemovementtendenciesaccordingtoasummaryinBritain'sDailyMailnewspaper. 1WhatdotheunderlinedwordspeerintoinParagraph2probablymean? A.understand B.stareat C.searchfor D.concernabout 2Howdidtheresearchersconducttheresearch? A.Itwascarriedoutinalab. B.42subjects'eyemovementswererecorded. C.Thestudents'dailymovementsweretracked. D.Itssubjects'personalitiesweredeterminedbycomputer. 3AccordingtoTobiasLoetscherwhatcanweknow? A.Robotsandcomputersaresociallyconscious. B.Peoplecarelessaboutimprovedpersonalizedservices. C.Today'srobotsandcomputerscanaccustomtonon﹣verbalinformation. D.Thediscoverywillimprovetheinteractionbetweenhumanbeingsandmachines. 4Whatcanbeasuitabletitleforthetext? A.HumanPersonalityTraits B.WhatHumanEyeMovementsAre C.TellPersonalitiesbyEyeMovements. D.HowHumansandMachinesInteract
Theskinundertheeyesisdelicatewhichiswhyitsometimesappearssunkenandhasdarkercoloringthanelsewhereontheface.Agingandhealthproblemsplayaroleinsunkeneyesbutotherfactorscancontributesoitmayaffectyoungerpeopleaswell. Dehydration Themostcommoncauseofsunkeneyesisdehydrationornothavingenoughwaterinthebody.Consumingtoomuchcoffeesodaandprepackageddrinksmayincreaseproductionofurine尿液whichmayleadtodehydration. Vitaminshortages ShortagesofvitaminCvitaminKandironcancauseeyestobecomesunken.VitaminChelpswithabsorbingironanddecreasingbruising瘀斑whilevitaminKisresponsibleforbloodthickeningcausingunhealthyskin.Easybruisingandunhealthyskinwillresultinsunkeneyes. Weightloss Mostpeopletendtoloseweightintheirfacefirst.Sometimestheweightlossissuddenenoughtomakebloodvessels血管belowtheeyeseasytoseeandtheskinclearproducingtheappearanceofsunkeneyes.Suddenweightlossmayalsocausenutritionalshortageswhichcanleadtosunkeneyes. Notenoughsleeporporqualitysleepcancausesunkeneyesandaperson'sDNAorthehabitofsmokingcanalsocontributetosunkeneyes.Mostcasesofsunkeneyesrelatetothequalityofanindividual'snutritionandhealthyliving.Whenthesecausesarecorrectedsunkeneyescanberesolvedwithoutfurthertreatment.Thismeansthatcausescanbeavoidedortreatedingoodtimetopreventtherecurrenceofsunkeneyes. 1Whatcanwedotopreventdehydrationaccordingtothetext? A.Refusecoffee. B.Drinkmorewater. C.Saynotosoftdrinks. D.Havecertaindrinksless. 2Whatwillleadtobruisingbelowtheeyes? A.LackofvitaminK. B.Watershortages. C.LackofvitaminC. D.Nutritionalshortages. 3Whichofthefollowingshouldbeavoidedforpeoplelosingweight? A.Palefaces. B.Suddenweightloss. C.Cleanskin. D.Narrowbloodvessels.
8分Anxietyisanaturalresponsethatchangedgraduallyovermillionsofyearstomakeusmorecarefulandourbodiespreparedtofleedanger.Butfeelinganxiousbecauseyouheardanoiseonadarkstreetisn'tthesamethingashavingananxietydisorder.Thekeythingwelookforinthecliniciswhetheranxietyisinterfering妨碍withaperson'sday﹣to﹣daylifeorcausingthemalotofunhappinesssaysNickGreyofKing'sCollegeLondon. ToclinicalpsychologistslikeGreymaladaptive不恰当的beliefsaretypicalinanxietydisordersandareoftenusedtodeterminethetypeofanxietysomeonehas.Insocialanxietydisorderthemostcommonanxietydisorderyoumightbelievethatyourfaceturningredwillresultinpeoplelaughingatyou.Peoplewiththistypeofdisorderexperienceconstantandgreatfearbeforeduringandaftersocialevents. Ifyouhavepanicdisorderyoumightassumethatyouarehavingaheartattackifyourheartstartstorace.Thephysicalsymptomsofanxiety﹣apoundingheartdifficultybreathingfeelingdizzy﹣willthencomeoninarush.Everyonecanexperiencesuchpanicattacksfromtimetotimebutinpanicdisordertheattacksareregularandbecomeasourceofanxietythemselves. Othermaladaptivebeliefsarelessspecific.Generalizedanxietydisorderischaracterizedbycontinuousworriesaboutarangeofdifferenteventsoractivitiesforatleastsixmonths.Ifyouhavethisconditionthebeliefdrivingyouranxietycouldforexamplebethefeelingit'syourjobtotakecareofotherpeopleorthatyouhaveresponsibilitiesthatyoumustmeetatallcost.TodecidewhotoreferforfurthertreatmentdoctorsmightuseatoolcalledtheGAD7test. 1Whichofthefollowingbelongstoananxietydisorder? A.Quarrelingwithparents. B.Gettingtoschoolearlier. C.Missingalunch. D.Knockingonthewall. 2Whatissocialanxietycharacterizedby? A.Continuousworries. B.Pastexperiences. C.Maladaptivebeliefs. D.Frequentterrors. 3Whatwillhappentoyouwhenyouhavepanicdisorder? A.Youcan'tstandsteadily. B.Yourfaceturnsred. C.Youcan'ttouchanything. D.Yourhandsfeelnumb. 4Whatanxietydisorderoccursmoreoftenthanothers? A.Generalizedanxiety. B.Panicattacks. C.Socialanxiety. D.Acuteanxietyattacks.
25分假定你是李华你的外国朋友Chris在电视里看到中国春运发邮件向你询问有关情况.请你回复邮件内容包括1.原因及时间 2.30多亿人次流动 3.交通方式. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. 3.参考词汇春运﹣SpringFestivaltravelrush
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