[今日更新]江西省2024年初中学业水平考试模拟（五）.物理试卷答案

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[今日更新]江西省2024年初中学业水平考试模拟（五）.物理试卷答案试卷答案

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betaken.Therestwilltakecareofitselfifyoukeepatit.Onestepatatime.That'sthesecret.Thenhewrotedownanoldmottoontheblackboard-thelongestjourneystartswithasinglestep.Havingheardhisstaircaseanalogy(),weunderstoodwhyheaskedusthequestionandwesawhiminanewlight.Mostofmyclassmatesscoreddistinctions(成绩优异)inmaths.AndIwentontobecomeanEnglishteacher.Tothisday,wheneverIpassonMrIyer'sinvaluableadvicetomyownstudents,theybrightenupattheprospectofalighteracademicburden24.Whatisthemainideaofthefirstparagraph?A.ThewayMrIyertaughthisstudentsmaths.B.Thereasonwhymathswashardfortheauthor.C.Thestudents'pointsofviewonMrIyer'scharacter.D.Thebriefintroductionoftheauthor'smathsteacher,Mrlyer.25.WhydidMrIyerstopsolvingamathematicalprobleminclass?A.Mrlyerwasalittletiredandwantedtohavearest.B.Somestudentsmadetroubleandaffectedtheclass.C.Themathematicalproblemwasratherpuzzling.D.Somestudentsseemedimpatientandupset.26.Whatisthesecretofreachingone'sgoalaccordingtoMrlyer?A.Thereisonlyonestepbetweensuccessandfailure.B.Takeactionquicklyandmakeprogresslittlebylittle.C.Itisimportanttomakeuseofagoodopportunity.D.Don'thesitatetoaskforhelpwhenmeetingwithbarriers.27.HowdoestheauthorlikeMrIyer'sadvice?::A.Strangeandimpractical.B.Incorrectandmisleading.C.Meaningfulandvaluable.D.SimpleanduninterestingODifferentweathermakespeoplefeeldifferent.Itinfluenceshealth,intelligenceandfeelings.InAugust,itisveryhotandwetinthesouthernpartoftheUnitedStates.Peopletherehavehearttroubleandotherkindsofhealthproblemsduringthismonth.IntheNortheastandtheMiddleWest,itisveryhotatsometimesandverycoldatothertimes.PeopleinthesestateshavemorehearttroubleaftertheweatherchangesinFebruaryorMarch.Theweathercanalsoinfluenceintelligence.Forexample,ina2018reportbyscientists,IQsofagroupofstudentswereveryhighwhenaverystrongwindcame,butafterthestrongwind,theirIQswere10%below.Thewindcanhelppeoplehavemoreintelligence.Veryhotweather,ontheotherhand,canmakeitlower.StudentsinmanyschoolsoftheUnitedStatesoftengetworseonexamsinthehotmonthsoftheyear(JulyandAugust).Weatheralsohasastronginfluenceonpeople'sfeelings.Wintermaybeabadtimeforthinpeople.Theyusuallyfeelcoldduringthesemonths.Theymightfeelunhappyduringcoldweather.Butfatpeoplemayhaveahardtimeinhotsummer.Atabout18C,peoplebecomestronger.Lowairpressuremaymakepeopleforgetful.Peopleleavemorebagsonbusesandinshopsonlow-pressuredays.Thereis"goodweather"forworkandhealth.Peoplefeelbestatatemperatureofabout18C.Areyoufeelingsad,tired,forgetful,orunhappytoday?Itmaybetheproblemofweather.28.WhendopeopleintheNortheastinAmericahavemorehearttrouble?A.InFebruary.B.InJuly.C.InAugust.D.InNovember.29.Whichisnotmentionedinthetextaboutwhatweatherhasaneffecton?A.People'shealth.B.People'sappearance.C.People'sintelligence.D.People'sfeelings.

B0.在进行滑雪赛道创新设计中,一位同学设计如图所示的模型,并用小球替代滑雪运动员进行研究.该模型滑道由弧形轨道ED、水平轨道DA、半径为R=0.4m的圆弧轨道AB(AOB=30^),足够长的倾斜直轨道BC组成,所有轨道均光滑且平滑连接,并固定在竖直平面内.当小球从D的左侧弧形轨道上P点(图中未画出)静止释放后,不计空气阻力,则下列表述符合实际情况的是EA.在P点到A点的运动过程中,小球的机械能守恒B.当PD间高度为0.3m时,小球会一直贴着滑道运动C.当PD间高度为0.4m时,小球会从A处飞出DA43300CD.当PD间高度大于0.5m时,小球落到BC上

17.(15分)如图所示,两个半圆状同心圆弧,分别交于坐标轴上的a、b、c点和d、e、点。大圆弧半径为R0,,向电场(电场方向由原点0向外)分布于两半圆弧之间,两半圆弧间的电势差为U0。。半上方区域有垂直纸面向里的足够长的匀强磁场,其上边界在y=2R0处,半圆弧abc内为无场区。O点处有一粒子源,可以在xOy平面内向x轴上方各个方向均匀射出带正电的粒子(粒子的质为m,,电衡量为q),,初速度大小均为粒子先后经过电场和磁场区域。不计粒子的重力以及粒子之间的相互作用,不考虑粒子从磁场返回圆弧区域边界后的运动。63^=2,,求:(1)粒子刚进人磁场区域的速度大小;(2)当垂直于磁场上边界射出磁场的粒子做圆周运动的半径最小时的磁感应强度大小B1;(3)若磁感应强度大小B2=32B1,不能从磁场上边界射出的粒子数与总粒子数的比值。

9.如图为滑雪运动赛道的简化示意图,甲、乙两运动员分别从AB曲面(可视为光滑)上的M、N两点(图中未画出)由静止滑下,到达B点后,分别以速度v1、v2水平飞出。甲经t1后落到斜坡滑道上C点,乙经t2后落到斜坡滑道上D点。已知O在B的正下方,斜坡滑道OD足够长且倾角为θ,不计空气阻力,两运动员均可视为质点。下列说法正确的是ABDA.M点的高度低于N点的高度B.甲、乙分别落在C、D两点时的速度方向与OD间的夹角相等C.若测得OC=CD,,一定有t2BD,则有可能OC=CD