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河北省2023-2024学年度七年级结课评估 4L R物理试卷答案试卷答案

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College,andusedthephrasetodescribetheathleticachievementsofstudentsattheschool.HehadpreviouslybecnattheAlbertLeGrandSchool,wheretheLatinwordswerecarvedinstoneabovethemainentrance.TheOlympicoath(宣誓)"Inthenameofallthecompetitors,IpromisethatweshalltakepartintheseOlympicGames,respectingandabidingbytherulesthatgovernthem...inthetruespiritofsportsmanship,forthegloryofsportandthehonorofourtcams."WrittenbyPierredeCoubertin,theoathistakenbyanathletefromthehostnationwhilcholdingacorneroftheOlympicflag.Theathletes'oathwasfirsttakenbyBelgianfencer(击剑运动员)VictorBoinatthe1920AntwerpGames.Ajudgefromthehostcountryalsospeakstheoathwithslightlydifferentwording.(21)TheOlympicflamewasfirstburnedatinmoderntimes,A.the1952Games.B.the1924Games.C.the1932Games.D.the1936Games.(22)Fromthepassagewecanlearnthat_A.thetorchrelaywasheldateveryOlympicGamessince1936.B.theOlympicmottowasoriginallywrittenbyPicrredeCoubertin.C.theOlympicathletes'oathwasfirsttakenattheAntwerpGamesD.theOlympicjudgesmakeavowwithcompletelydifferentwording.(23)ThispassageisprobablytakenfromA.theOlympicofficialwebsite.B.adailynewsreporl.C.apromotionaladvertisement.D.anacademicresearch.BAt74JamesPattersonhassoldmorethan425millioncopiesofhis200novelsglobally,makinghimoneofthehighestpaidauthorsintheworld."Idonotworkforaliving.Iplayforaliving.Ilovedoingit,"PattersontellsCNBC.ButPatterson'sroadtosuccessdidn'thappenovernight.Hestartedwritingasasidehustleandhefacedalotofrejectionbeforegettinghisfirstbookpublished.PattersongrewupinthewoodsinNewburgh,NewYorkwithaninsurancesalesmanfatherandaschooltcachermother.Despitchavingdreamsofbcingawritcr,theidca"alwaysscemedpresumptuous",Pattersonsays.ButafterreadingbooksbyJamesJoyce,"itreallyturnedmeontoreading,andthenIstartedwriting,"hesays.Aftercollege,PattersongothisfirstjobasajuniorcopywriterattheadvertisingagencyJ.WalterThompson.Whileclimbingthecorporateladder,Pattersonwrotehisfirstbook,TheThomasBerrymanNumberinthemid-70s.Thebook"gotturneddownby31publishers",Pattersonsays.Butafteritwasfinallypublishedin1976,"thenitwonanEdgarAwardforbestfirstnovel."TheEdgarAward,whichisnamedafterEdgarAlanPoe,honorsthebestwritersinmysteryfictionandnon-fiction.Despitepublishinghisfirstbookatage26,Pattersondidn'thaveabestselleruntilhewas40."Itwasn'tlikeallofasudden,"hesays.Infact,PattersonkepthisdayjobfordecadesandgotpromotedtoCEOofJ.WalterThompsonin1988.Duringthattime,Pattersonsayshewouldreadwellover100booksayeartohelpsparkhiscreativity"IhaveahugeimaginationandI'mconstantlyasking,whataboutthis?Whataboutthat?"hesays.Despitehissuccess,Pattersonsayshedoesn'tliketogiveadvice,especiallyaboutwriting.Buthe

河北省2023-2024学年度七年级结课评估 4L R物理试卷答案第一部分

15.(14分)如图所示,长为41的不可伸长的轻绳,穿过一长为l的竖直轻质细管,两端拴着质量分别为m、2m的小球A和小物块B,开始时B先放在细管正下方的水平地面上。管的下端离水平地面的距离为2l。拉起小球A,使绳与竖直方向成一定夹角,给小球A适当的水平速度,使它在水平面内做匀速圆周运动,已知重力加速度为g,不计一切摩擦阻力(已知37^=0.6,37^=0.8)。(1)求拉小球A的绳与竖直方向夹角=37^时,水平地面对物块B的支持力FN和小球A做圆周运动的角速度1;(2)轻摇细管可使物块B离地,求物块B悬停在离地高度为1处时,小球A做匀速圆周运动的角速度2;(3)轻摇细管可使B离地后在管口下的任意位置处于悬停,当B悬停在某一位置时,上端管口的触发装置使绳断开,求A做平抛运动的最大水平位移。

河北省2023-2024学年度七年级结课评估 4L R物理试卷答案第二部分（待更新）

=30^15.(16分)如图所示,倾角0=30°足够长的斜面与水平地面在B点通过一小段圆弧平滑连接,质量m2=0.2kg的木块静止于B处。现将质量m1=1kg的小物块从斜面上的A点由静止释放。已知A、B两点间的距离x=9m,,它们与斜面间的动摩擦因数均是1=35,小物块及木块与水平地面间的动摩擦因数均是2=0.5,小物块及木块均可视为质点,所有的碰撞均为弹性正碰且不考虑碰撞的时间,取重力加速度大小g=10m/s^2。(1)求小物块与木块碰撞后瞬间小物块的速度大小v1;(2)求最终木块与B点间的距离s;(3)若在小物块与木块发生碰撞前瞬间,木块受到水平向左的瞬时冲量I=0.6N⋅s,求最终小物块与木块间的距离△s。m1θm2mgB