安徽省2023-2024学年度第一学期九年级学情调研（一）z物理考试试卷

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安徽省2023-2024学年度第一学期九年级学情调研（一）z物理试卷答案

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Therearemanyreasonsyoushouldlookfornaturalhaircareproductsinsteadofchoosingartificialoptions.Therearealsomanyplaceswhereyoucanbuythem.Ifyoucareaboutyourhairandwanttopromotehairgrowthwhiledecreasingthenumberofchemicalsthatgointoyourhair,thenyoushouldlookintopurchasingmorcnaturaloptions.Youwon'tbedisappointed.21.Inwhichcolumnofamagazinecanwefindthistext?A.Education.B.Amusemcnt.C.Life.D.Sports.22.Whatingredientmayensureshiningcolorofyourhairaccordingtothetext?A.CoconutOilandAloeVera.B.OrganicSheaButter.C.BetaGlucan.D.OrganicTeaTreeoil.23.Whatdoesthetextmainlytalkabout?A.Doingmorerescarch.B.Promotingyourhairgrowth.C.ChoosingNaturalShampoo.D.Guaranteeingnineingredients.BItseemsthateveryweekwefindoutsomeonebrokeintoabigcompany'sdatabases-liketherecentEquifaxdatabreach()-andmadeoffwithmillionsofcreditcardnumbers,passwordsandothervaluableinformation.Andnowanewkindofworry:someonecouldseizecontrolofyourwirelesshomenetworkandstealyourinformationfromunderyournose.That'sthepossibilityraisedbyacoupleofcybersecurityresearchersfromtheCatholicUniversityofLcuveninBelgium.Theproblem,theysay,isaweaknessintheveryprotocolmcanttomakewi-fisecure.ThatprotocoliscalledWi-FiProtectedAcccssIl,WPA2.AndWPA2'sweaknesscouldallowanattackerwithinphysicalrangeofyourwi-finetworktomakeacopyofthatnetworkthattheycouldthencontrol.Theresearcherscalltheirapproachakeyreinstallationattack,orKRACK.It'simportanttoknowthatKRACKattackremainsapossibilityfornow.Thesenitsrealizedthethreatwhileinvestigatingwirelesssecurity.They'llpresentthisresearchonNovemberIstattheComputcrandCommunicationsSecurity(CCS)conferenceinDallasandinDccemberattheBlackHatEuropeconferenceinLondon.IntheirKRACKassumption,wirelessdeviceswouldbefooledintoconncctingtothefalscnetwork.Andtheattackerwouldbeabletoaccessalloftheinformationthatdevicessendandreceivewhileconnectedtothatnetwork-evenifthatinformationhasbeencoded.AndroidandLinuxwouldbeespeciallyeasytoattackbecauseofhowtheirencryptionkeys(areconfigured(设定).Onemeasureofprotectionagainstsuchanattackwouldbetomakesuretheyyou'veinstall()themostup-to-dateversionsofyourapps,browsersandwirelessroutersoftware.Updatedsoftwareismostlikelytoincludethesccuritypatches(ncededtoavoidfallingvictimtoaKRACKattack,becausechancesarethatKRACKwon'tremainsimplyaproof-ofconceptforlong.24.WhatarehomeInternetusersconcernedaboutnow?A.TheirInternetmaybedisconnected.B.Theircreditcardsmightbeinaccessible.C.Theirhomenetworkmightbedestroyed.D.Theirpersonalinformationmightbestolen.25.HowcantheattackertakeadvantageoftheWPA2'sweakness?A.Byinstallingakey.B.Byapproachingphysicalrange.C.Bycopyingandcontrollingthenetwork.D.BycontrollingtheInternetusers26.WhatcanwelearnfromParagraph4?A.Thefalsenetworkcontributeslittletosuchattack.

安徽省2023-2024学年度第一学期九年级学情调研（一）z物理第一部分

(3)实验中静电计张角变小,说明平行板电容器电容(填“增加”或“减小”)实验中,能使静电计指针张角变小的是(填标号).A.只将b板靠近a板B.只将电容器b板向上平移C.只在极板间插人有机玻璃板D.只增加极板带电量

安徽省2023-2024学年度第一学期九年级学情调研（一）z物理第二部分（待更新）

15.(16分)如图所示,一个可视为质点、质量m=1kg的木块从P点以某初速度在水平面上向右m=1kg运动,木块运动到M点后水平抛出,恰好沿A点的切线方向进人粗糙圆弧轨道AB,做匀速圆周运动至O点正下方的B点。已知木块与水平面间的动摩擦因数μ=0.25,圆弧轨道的半径=0.25,R=0.5m,=53^,vB=5m/s,R=0.5m,半径OA与竖直半径OB间的夹角0=53°,木块到达B点时的速度大小u=5m/s,木块从P点运动到B点的位移方向与水平方向的夹角的正切值ta=524。取53^=0.8,53^=0.6,重力加速度大小g=10m/s^2,不计空气阻力、求:(1)木块在B点时圆弧轨道对其的支持力大小FN;(2)M、A两点间的水平距离x;(3)木块从P点运动到B点的时间t。(结果保留两位有效数字)MA