[今日更新]河南省2023-2024学年度七年级下学期期中考试（第六次月考）.物理试卷答案

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[今日更新]河南省2023-2024学年度七年级下学期期中考试（第六次月考）.物理试卷答案试卷答案

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flowdoesBionicReadingwork?readaterthhinkingkptheirbrainsmuchlC.sethemeaningsofsomekeyorderkeepaneyeonpartofthewholee99.WhatbenefitdoesBionicReadingbringtopeoplewithdyslexiaA.Selectingsuitablereadingcontents.B.Keepingupwithreadingcontents.C.Limitingreadingtime.D.Reducingstressfromreading.practical0.WhatcanwelearnaboutBionieReading?journalistoldontoA.Ithasnotbeenputintousesofar.pectB.Ithasalreadybeenfullydeveloped.6ringC.Itleavesusersafurtherreadingandthinking.D.Ithelpsusersskipthenewwordsinreading.31.Whichisthemostsuitabletitleforthetext?A.NewPioneeringPluginImprovesOnlineReadingB.OnlineReadingIsSureToPerfectPeople'sBrainC.SpendingTimeOnOnlineReadingIsWorthwhileD.NewPioneeringPluginStillNeedsToBeImprovedDAnewstudydiscoversthatsharksdosleep,andtheyoftensleepwiththeireyesopen.Sincesomesharkshavetoswimconstantlytokeepoxygen-richwaterflowingovertheirgills(鱼鳃)，peoplehavelongthoughtthattheydon''tsleepatall.ResearchersfromAustraliahavenowrecordedaspeciesofsharksleepingforthefirsttime,finishingthelong-standingdebateaboutwhethersharkssleep.Toseeifsharkswereinfactasleep,theteamanalyzedthemetabolism(新陈代谢)andposeofsevendraughtsboardsharks(over24hours.Whenthesharkswererestingforfiveminutesorlonger,theiroxygenconsumptiondropped,whichsuggestedtheanimalsweresleeping.Andtheresearch-ersalsonoticedthatthesharkschangedtheirposturebylyingflatandclosertotheground.Thesharkssometimessleptwiththeireyesshutaswell,though,mostlyduringtheday.Atnight,theytendedtokeeptheireyesopenmoreoften,leadingresearcherstosuspectthatthesharks'eyeclosuremighthavemoretodowithlightthanthesleepstateitself."Notonlyaresleepingsharkslessresponsivetotheirsurroundings,buttheyalsohavelowermetabolicrate,"saidMichaelKelly,anecophysiologistatLaTrobeUniversity.“Sharksareanimportantgroupastheyaretheodestlivngwedvereae(颌类脊动物)-acharactertheysharewithus,”MichaelKellysaid.“Sharkshavebeenswimmingtheseaforover400millionyearsandhaveevolvedverylittleinthattime.Understandinglwilrovideimportantunderstandingintothefunciono.23Iodovertime."万)】

13.(10分)如图所示,一根长度L=1m、质量m=0.5kg的导体棒垂直导轨放置,空间存在垂直纸面向里、大小为5T的匀强磁场B,导体棒中通有电流I,导体棒所受安培力恰好等于所受重力,取重力加速度大小g=10m/s^2,,导体棒始终静止,求:(1)电流I的大小;(2)导体棒对导轨的作用力大小

15.安安用酒精灯对冰块加热,研究冰的熔化现象。图中甲、乙两条图线中的一条是他依据实验数据绘制而成。已知m水=0.1kg,c水=4.210^3J/(kg^C),c水=2.110^3J/(kg^C),下列分析正确的是A.安安绘制的是乙图线B.0∼1min内冰块吸收的热量为2.110^3JC.1∼3min内温度不变,说明冰块没有吸收热量D.如果酒精完全燃烧,酒精灯的加热效率可以达到100%

2.如图所示,L形的书立上放了一本书,一起静置在水平桌面上,A、B为书和书立间的两个接触点。下列说法正确的是0书书立BA.在B点书受到书立的弹力竖直向上,在A点书受到书立的弹力水平向右B.书在B点一定受到水平向左的摩擦力C.书立对书的作用力竖直向上D.桌面对书立一定有水平向右的摩擦力直