[今日更新]2024年普通高等学校招生全国统一考试·金卷 BBY-F(二)2.物理试卷答案

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A.Herealizedthatbeefwasthebestmeat.B.Hestartedtolikehome-madebeefsteaksC.Hewouldeatbeefsteaksonlyinthatrestaurant.D.Hedidn'tthinkbeefsteakswereterriblefoodanymore.30.Whycouldn'ttheauthor'smomcookbeefsteakswell?A.Sheseldomatemeatwhenshewasyoung.B.Shehadlittleexperienceincookingthem.C.Shecouldn'taffordgoodbeefatthattime.D.Sheactuallywasn'tagoodcook.31.Whatmessagedoesthetextwanttogive?A.Oneisnevertoooldtolearn.B.Failureisthemotherofsuccess.C.Greatnessstillneedslearningandgrowing.D.Everyonehasbothstrengthsandweaknesses.0ChinesetelevisionmakerSkyworthGroupisstrengtheningeffortstoventureintothe5G-powered8Kultra-highdefinitionTVsection,especiallythewholeindustrialchainrelatedtothetop-notch8Ktechnology,asitaimstogrababiggersliceofthecountry'shigh-endTVmarket.WangZhiguo,chairmanandpresidentofShenzhenSkyworth-RGBElectronic,saidthecompanyiscommittedtoprovidingacomplete8Ksolutionthatcovers8Kvideocameras,monitors,contentcreationandcloudoperatingsystems,andexpandsapplicationinawiderangeoffieldssuchasaerialphotography,education,healthcareandadvertising.Thecompanyuncovereditsnew8KTVproductQ71,whichsupports8Ksignalreception,decoding,imagesignalprocessingandscreendisplay.The8KTVshaveascreenresolutionratiothatis4.3timesclearerthanhumaneyesightandfourtimeshigherthanthe4Kones.8KUHDlivestreamingandcloud-basedbroadcastingwillgiveviewersamoreimmersiveexperience."5Gofferstechnologicalsupportfortheadoptionof8K,while8Kisoneofthebestapplicationscenariosofthesuperfastwirelesstechnology,"saidWuWei,chiefengineerofSkyworth,adding5Ghastheadvantagesofhighspeed,largecapacityandlowlatency,whichbringsaboutagoodopportunityforthepopularizationof8Kultra-highdefinitionTV.Andthecountry's8KvideoindustrywillseerobustgrowthwiththeBeijing2022WinterOlympics,whichwilluse8KUHDlivestreamingandtransmission.Thedomestic8KTVindustryisnowinanascentstage,Wusaid,addingthatSkyworthwillintensifyresearchanddevelopmenteffortsin8Kchipstoimprovetheclarity,contrastandbrightnessofimages."Whilethereisashortageof8Kvideocontent,whichrequiresadvanced,professionalequipmentsuchasspecialcamerasandmonitors,increasingthecostofproducingcontent,withtheadventofsuperfast5GtechnologyandthepopularizationofbigTVs,8Khascreatedmanyopportunities.Thebroadcastingofsportingeventsvia8Kequipmenthasalsomotivatedpeopletodemandhigh-definitionimagequality,"saidLiuFei,researchdirectoroftheconsumerelectronicsdepartmentofSkyworth.32.Whatisthemainideaofthispassage?A.SkyworthGroupisacceleratingeffortstotapinto8Ktechnology.B.5Gtechnologyand8Karedevelopinghandinhand.C.5G-powered8Kultra-highdefinitionTVhasapromisingfuture.D.Skyworthwillprovideviewersamoreimmersiveexperience.33.Theunderlinedword"nascent"inthefifthparagraphprobablymeans"A.bottleneckedB.vialC.immatureD.developed

114.(13分)如图所示,间距为L的足够长光滑平行金属导轨竖直固定,其上端用阻值为R的定值电阻连接.装置处于垂直于导轨平面向里的匀强磁场中,磁感应强度大小B,质量为m的金属棒ab从轨道底部以初速度v0沿导轨竖直向上运动,ab棒向上运动的最大高度为h,,返回到初始位置时加速度恰好为零,运动过程中ab棒始终与导轨垂直且接触良好,导轨和ab棒的电阻均不计,空气阻力不计,重力加速度为g.求:(1)ab棒运动过程中的最大加速度大小;(2)ab棒向上运动过程中,通过电阻R的电量及电阻R上产生的焦耳热;(3)ab棒从开始向上滑动到回到初始位置所用的时间.

(1)关于本实验,下列说法正确的是AC。A.圆弧轨道不需要光滑B.滑块A是空心,滑块B是实心C.滑块A每次必须从同一位置由静止释放D.两滑块与水平轨道间的动摩擦因数可以不相等

10.如图所示,粗细均匀的光滑直杆竖直固定,物块A套在光滑杆上可自由滑动,绕过光滑定滑轮的细绳端连接在物块A上,另一端竖直悬挂着物块B,开始时锁定物块A,细线与竖直37^,杆的夹角为37°,解除物块A的锁定,物块B由静止向下运动,当细绳与杆垂直时,物块A的速度刚好为零,物块B下降的最大高度为h,重力加速度为g,sin37°=0.6,h,g,37^=0.6,cos37°=0.8,则37^0.8,CDBA.物块A到最高点时,物块B的速度最大37°B.物块A向上运动过程中机械能一直增大AC.物块A、B的质量之比为1:2D.当细绳与竖直杆间的夹角为53^时,物块A的速度大小为5343gh