[今日更新]河南省焦作市2023-2024学年（下）八年级期中诊断试卷.物理试卷答案

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[今日更新]河南省焦作市2023-2024学年（下）八年级期中诊断试卷.物理试卷答案试卷答案

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Inhighschool,Mrs.Davieswasmymathteacher,whotookherjobseriouslyandexpec-tedherstudentstoputforththesamedegreeofcommitment.Thoughshewas30,shelookedveryyoungforherage.Andshewasoneofthemostpopularteachersinourschool.Comparedwithotherteachers,Mrs.Daviespaidmoreattentiontoherwayofteaching.Shetriedvariouswaystomakeherclasseslivelyandinteresting.Strictbutfair,sheheldourattentionwithhertime-provenapproach.Oneofherclasseswasforstudentswhoweremoreadvancedacademically.Ichosetotakeitandsoonrealizedthatthecoursewasabitovermyhead.Istruggledwiththecomplexproblemsthatothersseemedtolearnwithoutmucheffort.thOneFridayweweretestedonourabilitytouseatheorem(thatnooneintheclasshethoroughlyunderstood.Theteacherwouldgradeourpapersbasedonourabilitytoprogressthroughtheproblem.Iwasabsolutelylost.Finally,Ididn'tusetherequiredtheorem.new嵌Instead,Idecidedtousemorefamiliartheoremstoarriveattheanswer.IknewIhadfailedbecauseIhadn'tdonetherequiredassignment.Ibecameresignedtomyfate.but注意：rom学1.续写词数应为150左右；些2.请按如下格式在答题卡的相应位置作答

器)of席OurtestpaperswerehandedbackthefollowingMonday.$&RtThoughIdidn'tusetherequiredtheorem,Mrs.Daviesseemedgenuinelyproudofme.烟ng哦閣downlarlymentrfriends,angmany

12.(3分)如图所示,水鸟站在水中觅食,人能从不同角度看见水鸟是由于光照射在水鸟身上发生了(选填“镜面”或“漫”)反射,这种反射(选填“遵循”或“不遵循”)光的反射定律。水面看起来波光粼粼是因为阳光在水面发生了(选填“镜面”或“漫”)反射。

(2)在某次实验中,小车释放后依次经过光电门1、2,测得小车的加速度大小为a,,根据以上数据,当地重力加速度g=。(用m1、m2、M、a表示)

场L,磁场方向均垂直水平面向上,磁感应强度大小均为B.一边长为2L、质量为m正方形金属线框,在水平面上B.向右进人磁场,并刚好能穿出磁场.则下列说法正确的是以初速度v0A.线框ab边出磁场I和出磁场Ⅱ时的速度相同B.线框ab边出磁场I时的速度大于12n0C.线框ab边出磁场I时的速度小于12uD.线框ab边进、出磁场I的过程中,线框中产生的焦耳热为38mv0^2