[今日更新]万友2023-2024学年上学期七年级教学评价四(期末).物理试卷答案

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[今日更新]万友2023-2024学年上学期七年级教学评价四(期末).物理试卷答案试卷答案

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ButeocleverwhenitomforthemselvesTheycetroublebyivingnreofmpec同种个体)withurieForme,aceI%Cad8veryod)ideshadrodBuththeousthivinHowthsWellthesumpnourishedbyitsneighborwithnutrientsfromtherootsystem.andhadbeenforatleast400years!Whydodosuhathing?Itmbettertotherrdtheforstitprotectsthemfromstorms,providestherightmicroclimateandwarnsthemofattacks.28.Whydoestheauthormentionthethreeoaktrees?A.Toillustratetreescanlearnfromexperiences.B.Toshowtreescanmakeindependentdecisions.C.Toexplaintreesarequitesupportiveofeachother.D.Toprovetreeshavethesamepersonalitiesashumans.29.Accordingtothetext,whichofthefollowingbestdescribesgeneralfeaturesoftrees?A.Anxiousandbold.B.Smartandadventurous.C.Helpfulandwell-behaved.D.Adaptableandsupportive.30.Whatdoestheunderlinedphrase"dosuchathing"mean?A.Givewarnings.B.Offerassistance.C.Dependonothers.D.Providenutrients.31.Wheredoesthistextmostprobablycomefrom?A.Asciencebook.B.Atraveljournal.C.Apublielecture.D.AnexperimentreportDTheUSspaceageneyNASAhasrevealedanastonishingpicturerevealingnewsecretsoftheEarth'shomegalaxy(),theMilkyWay.Thesunisjustoneofhundredsofbillionsofstarsthatformthehugeshapeofourgalaxy.OursolarsystemsitsinaremoteregionbutthenewimagefocusesonthecenteroftheMilkyWay,a"noisy"areabecauseofallthecrowdedstars.Lightfromthisregiontakesabout26.000yearstoreachEarth.Forcomparison,lighttakesjusteightminutestoreachusfromthesun.Theresearchersusethedatacollectedbytwotelescopesthatseetheskyinwaysthatareverydifferentfromthevisiblelightoureyescanseetoformthenewimage.Mostofthedatacomesfrom370differentpicturestakenoverthepast20yearsbyNASA'sChandraXObservatory.ThissatellitetelescopedetectsX-raysoutinspace.X-raysareaformofradiationthatissentoutwhenviolenteventsheatmattertotemperaturesofmillionsofdegrees.OtherdatacomesfromtheMeerKATtelescopeinSouthAfrica,whichcandetectradiowavesfromspace.ThesewaveshavemuchlessenergythanX-rays.Theyareusuallyproducedbycoolermaterial,suchashugecloudsofgasbetweenthestars.Thebrightestsourcesineludeneutronstarswhicharethecoresofhugestarsthatranoutoffueandcolapsedtocity-sizedballsofsuperhotmatter.Manyneutronstarsandblackholesjetoutgasesthatappearinthepictureaspurplestreaks().Powerfulmagneticfieldsitheareacausethejetstobendastheygetfurtherfromtheirsoure.AstronomerDDanielWanghhasworkedontheimgevethepastyear,saidthenewpicturedescribed“aviolentorenergeticecosystem”.【23模拟调研·英语（一）第5页（共8页）LLY】

9.2023年9月5日《新浪网》刊文《下一次火星冲日是何时》。介绍说,当地球位于太阳和火星之间且三者几乎排成一条直线时,称之为“火星冲日”,并预测下一次火星冲日将发生于2025年的1月中旬。假定地球和火星在同一平面上、沿同一方向绕太阳做匀速圆周运动。已知火星半径约为地球半径的12,质量约为地球质量的19,火星的公转周期约为地球公转周期的1.9倍,[3]1.9^21.5。,下列说法正确的是A.火星冲日时间间隔约为2.1年B.火星与地球公转轨道半径之比约为3:2C.火星与地球表面重力加速度之比约为2:9D.火星与地球密度之比约为8:9

9.如图所示的轨道,AB、BC均为直轨道,其中AB段光滑,CD段为圆心角为a=53,半径为R=53^,m的光滑网弧,一可视为质点的质量为m的小球由距离BC高度为2R处由静止释放,经过段时间由D点离开轨道,已知小球经过C点时,小球对轨道的压力等于自身重力的3倍.忽略小球经过B、C两点处机械能的损失,sin53°=0.8.则下列说法正确的是53^=0.8.A.小球刚到B点的速度为2gRB.小球在BC段克服摩擦力做功为mgRmgRC.小球在D点对轨道的压力为1.8mgD.小球离开轨道后,最高点到BC的高度为R

14.(14分)如图所示,空间虚线左侧有水平向右的匀强电场,电场强度大小为E,右侧有垂直纸面向里的匀强磁场。电场中的P点处有一个质量为4m、、带电荷量为q(q>0))的带电粒子M,在电场和磁场交界线上的Q点有一个质量为m的不带电的粒子AV,P、Q间距离为L0粒子M1在电场力的作用下由静止开始水平向右运动,恰好与粒子N发生弹性正碰,碰撞后两粒子均向右运动进人磁场,两个粒子第一次回到电场的位置相同,且在该位置再次发生碰撞。已知两粒子碰撞过程发生电荷转移,不计粒子重力和粒子间的相互作用。求:(1)碰后M、N的速率;(2)碰撞后两粒子的电荷量;(3)磁场的磁感应强度大小