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2024学年第一学期浙江省名校协作体（高三9月）(物理)试卷答案试卷答案
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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
(1)小源同学在闭合开关前,滑动变阻器的滑片应移到(选填“C”或“D”)端,若闭合开关后,观察到电流表指针偏转情况如右图所示。为提高实验精确度,他下一步的操作是。
6.某实验小组设计的电吹风电路图如图所示,a,b、c,d为四个固定触点,可转动的扇形金属触片P可同时接触两个触点。触片P处于不同位置时,电吹风分别处于关机、吹热风和吹冷风的三种工作状态。该电吹风吹热风时的输人功率为460DW,吹冷风时的输人功率为60W,,小风扇的额定电压为60V,正常工作时小风扇输出功率为522W,理想变压器原、副线圈的匝数分别为n1、n2,.下列说法正确的是A.吹冷风时触片P与a、接触B.原、副线圈匝数比n1:n2=3:11C.小风扇的内阻为8ΩD.吹热风时电热丝消耗的热功率为408W
16.(14分)如图所示,在平面直角坐标系xOy的x轴下方存在方向竖直向上、电场强度大小E2=4N/CC的匀强电场,x轴上方存在方向水平向右、电场强度大小E=4N/C的匀强电场,等边三角形abc边长L=1m,底边bc在x轴上。比荷qm=110^10C/kg-1×10C/kg的带正电粒子在ν轴上的P(0,-0.75m)点以v1=0.510^5m/s的速度沿y轴正方向射出,经O点进入电场,粒子恰好经过等边三角形ab边的中点d(图中未标出),不计粒子的重力。(1)求粒子经过O点时的速度大小及d点的坐标;(2)若使粒子经过a点,求粒子从P点射出时的速度大小。
