首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
在桌面上有一倒立的玻璃圆锥，其顶点恰好与桌面接触，圆锥的轴（图中虚线）与桌面垂直，过轴线的截面是边长为a的等边三角形，如图所示．有一半径为r的圆柱形平行光束垂直入射到圆锥的底面上，光束的中心轴与圆锥...
查看本题答案
包含此试题的试卷
高三下学期物理《》真题及答案
点击查看
你可能感兴趣的试题
2018年·兰州一中考前最后冲刺模拟桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌
桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图所
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB=120°顶点O.与桌面的距离为4a圆锥的底面半径圆
在桌面上有一个倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB=120°顶点O.与桌面的距离为4a圆锥的底面半径圆
桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图所
在桌面上有一个倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如
在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图
如图所示桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角
从桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图
r
1.5r
2r
2.5r
桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图
如图7所示在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边
r
1.5r
2r
2.5r
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB=120°顶点O与桌面的距离为4a圆锥的底面半径R=
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB=120°顶点O与桌面的距离为4a圆锥的底面半径R=
桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角形如图
r
1.5r
2r
2.5r
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB＝120°顶点O与桌面的距离为4a圆锥的底面半径R
如图所示桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面为等边三角
如图所示在桌面上方有一倒立的玻璃圆锥顶角∠AOB＝120°顶点O与桌面的距离为4a圆锥的底面半径R
在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面是边长为a的等
在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴图中虚线与桌面垂直过轴线的截面是边长为a的等
热门试题
更多
已知椭圆＝1与双曲线＝1有共同的焦点且双曲线的离心率为2则该双曲线的方程为．
阅读如图的程序框图输出结果s的值为其中i为虚数单位i2＝﹣1
A Oneofmyfavourite1hobbyishiking.WhenIgohikingIwil1wearproperclothingandhikingshoesforthecurrentweatherconditions.AndIwillletmyfamilyandfriendsknowwhereIwillgoandwhenIwillreturn.AlsoIwillcarryacompassandGPSunit2canguidemeandlocatemyposition.What'smoreIwilltakeenoughfoodandwater3keepmeenergeticandemergencysuppliestosurvivedangeroussituations. B Lastyeartheemptylandacrossfrommybusstopwasasademptyuglyspacewithdeadbushesandoneshorttree.Thensome4gardenerchangedthat.Theyweretiredoflookingatthesadspacewhiletheywerewaiting5thebussotheymadeitintoabeautifulgarden.Nowyoucanseecolorfulvegetableplantsandsweet﹣smellingflowers.Yellowbutterfliesflyfromplanttoplant6happyandtinybirdssinginthegreentrees.Ilovetakingthebusnow. C Smokejumpersareaspecialtypeoffirefighter.Theyjumpfromplanesintoareasthataredifficulttoreachbycaroronfoot.Whentheyarrivetheretheyfirstexaminethelandanddecide7tofightthefire.Theirmaingoalistostopafirefrom8spread.Theywillusebasicequipmenttoclearlandofplantsandotherdrymaterials.Theworkisdangerous9theylovebeingabletojumpoutofplanesfightfiresandliveintheforest.As38﹣year﹣oldAlexiTishinwho10workasasmokejumperfor15yearssaysThisisthebestjobfortoughguys.
在正方体ABCD﹣A1B1C1D1中O是正方A1B1C1D1的中心则异面直线AD1与BO所成角为
在直角坐标系xOy中曲线C1的方程为y＝k|x﹣2|k∈R以坐标原点为极点x轴正半轴为极轴建立极坐标系曲线C2的极坐标方程为ρ2﹣2ρcosθ﹣6ρsinθ+8＝0． Ⅰ求C2的直角坐标方程 Ⅱ若C1与C2有四个公共点求k的取值范围．
WelcometoAMDA Yourfutureintheperformingartsdoesn'thavetobeadream.Forover50yearsAMDAhaslaunchedsomeofthemostsuccessfulcareersintheatrefilmandtelevision.AMDAcreatesindustryprofessionalswhodon'tjustwaitforlifetohappen﹣theystagetheirowncareerpath.Nowit'syourturn. Programdescription AtAMDAwebelieveaperformermustperform.Fromthefirstdayyou'llfindmanyperformanceopportunitiesinthethreecoreareasofactingmusicaltheatreanddancebothinandoutoftheclassroomplusindividualvoicelessons.Overthecourseofyourfoursemesters学期you'llalsoimproveyourperformancetechniquethroughanintensivecurriculumthatfocusesonbothfoundationalandadvancedconceptsinactingmusicaltheatreanddance.Finallythroughcoursesincareerpreparationyou'lllearnhowtoapplyallofthistrainingtoasuccessfulcareeronstageandscreen. Philosophyandmission AMDAiscommittedtoprovidingasplendidperformingartseducationtoadiversecommunityofcreativeartists.AMDAservesasbothschoolandstagewherestudentsaregiventhesupportandopportunitytoidentifytheirownpersonalobjectivesandtodevelopandimprovetheirowndistinctiveartisticvoices.AMDAtriestocreateanenvironmentforstudentstodeveloptheskillsconfidenceimaginationandpowertocontributetotheircommunityasartistsbusinesspeoplelifelonglearnersandhard﹣workingcitizensoftheworldAboveallAMDAwantstoteachstudentsthatcommitmentandpassionarethemarksofasuccessfulandjoyouscareer. Registration 6305YuccaStreetLosAngeles 800﹣367﹣7908 https∥www.amda.edu 1WhatisthecurriculumofAMDAabout? A.Drawing. B.Philosophy. C.Performing. D.Photography. 2Howlongdoesthecourselast? A.Onesemester. B.Twoyears. C.Threesemesters. D.Fouryears. 3WhatcanstudentslearninAMDA? A.Howtosingbeautifully. B.Howtotrainaperformer. C.Thewaytobuildastage. D.Thewaytobeadirector.
我国考古人员在秦陵挖掘的宝剑到现在仍然锋利无比原因是剑锋上覆盖了一层铬．铬能形成多种化合物主要化合价有+2价+3价+6价． 请回答下列问题 1基态铬原子的外围电子排布式为与铬同周期的所有元素中基态原子最高能层电子数与铬原子未成对电子数相同的元素是． 2铬原子的各级电离能IkJ•mol﹣1数据如下表所示铬原子逐级电离能增大的原因是． 3CrCl3•6H2O实际上是配合物配位数为6其固体有三种颜色其中一种暗绿色固体与足量硝酸银反应时1mol固体可生成1mol氯化银沉淀．则这种暗绿色固体的化学式为其中铬的配体水分子的VSEPR模型为该配合物中存在的作用力有填标号． A．离子键B．配位键C．共价键D．金属键 4CrO3能将乙醇氧化为乙醛二者的相对分子质量相近但乙醇的沸点比乙醛高原因是． 5某镧La铬Cr型复合氧化物具有巨磁电阻效应晶胞结构如图所示 ①该晶体的化学式为． ②该晶体中距离镧原子最近的铬原子有个若两个距离最近的氧原子核间距为apm组成物质的摩尔质量为bg•mol﹣1阿伏加德罗常数值为NA则晶体密度的表达式为g•cm﹣3．
“α＝+2kπk∈Z”是“cos2α＝”的
已知点MNPQ在同一个球面上且MN＝3NP＝4MP＝5若四面体MNPQ体积的最大值为10则该球的表面积是
若某几何体的三视图如图所示其中正视图与侧视图都是边长为2的正方形则该几何体的体积是
设数列{an}的前n项和为Snan+1+an＝2n+1且Sn＝2019若a2＜2则n的最大值为．
已知函数fx＝lnx+x﹣1ax﹣a﹣1． Ⅰ当a＝0时求fx的最大值 Ⅱ若对∀x＞1都有fx＞0恒成立求a的取值范围 Ⅲ证明n2+1•n2+2•n2+3……n2+n＞•n2n对任意正整数n均成立其中e为自然对数的底数．
已知变量xy满足的约束条件则z＝3x+2y的最大值为
如图在四棱锥P﹣ABCD中底面ABCD为菱形∠BAD＝60°Q为AD的中点． I若PA＝PD求证AD⊥PB II若平面PAD⊥平面ABCD且PA＝PD＝AD＝2点M在线段PC上试确定点M的位置使二面角M﹣BQ﹣C大小为60°并求出的值．
氮的固定是几百年来科学家一直研究的课题．请回答下列问题 1下表列举了不同温度下大气固氮和工业固氮的部分K值． ①分析数据可知大气固氮反应属于填“吸热”或“放热”反应． ②分析数据可知人类不适合大规模模拟大气固氮的原因是． ③从平衡视角考虑工业固氮应该选择常温条件但实际工业生产却选择500℃左右的高温解释其原因． 2已知工业固氮反应N2g+3H2g⇌2NH3g△H＝﹣94.4kJ•mol﹣1恒容时体系中各物质浓度随时间变化的曲线如图1所示各时间段最终均达平衡状态． ①在2L容器中发生反应前20min内νNH3＝． ②25min时采取的某种措施是． ③时段III条件下反应的平衡常数为L2•mol﹣2保留3位有效数字． 320世纪末科学家采用高质子导电性的SCY陶瓷能传递H+为介质用吸附在它内外表面上的金属钯多晶薄膜做电极实现高温常压下的电解法合成氨提高了反应物的转化率其实验简图如图2所示阴极的电极反应式是． 4近年又有科学家提出在常温常压催化剂等条件下合成氨气的新思路反应原理为 2N2g+6H2Ol⇌4NH3g+3O2g则其反应热△H＝． 已知N2g+3H2g⇌2NH3g△H1＝﹣92.4kJ•mol﹣1 2H2g+O2g⇌2H2Ol△H2＝﹣571.6kJ•mol﹣1
在圆Ox2+y2＝4上取一点P过点P作x轴的线段PDD为垂足当点P在圆O上运动时设线段PD中点M的轨迹为E． Ⅰ求E的方程 Ⅱ试问在E上是否存在两点MN关于直线ly＝kx+对称且以MN为直径的圆恰好经过坐标原点若存在求出直线MN的方程若不存在请说明理由．
下表中的实验内容能达到实验目的或能得出相应结论的是
设P＝{x|x＜4}Q＝{x|x2＜4}则
数列{an}的前n项和为Sn且a1＝2an+1＝SnneN* Ⅰ证明数列{Sn}为等比数列并求Sn Ⅱ若bn＝1ga2n求数列{bn}的前n项和Tn．
在△ABC三个内角ABC所对的边分别为abc满足c﹣2acosB+bcosC＝0． Ⅰ求角B的大小 Ⅱ若＝12b＝2求ac的值．其中a＜c
Anythingyouwantanytimeyouneedit. ThemessageappearedoncomputerscreensacrossthecountryatthesametimeonthesamedayDecember12that12p.m..Simultaneouslyimportantlookingenvelopescontainingcardswiththesamemessagewerehand﹣deliveredtotheofficesofallthemajornewscompanies. OnefounditswaytothedeskofChrisLinabusinessreporteratThePost.Thecardwasbeautifullydesigned﹣ablackbackgroundwiththewordsprintedoutincrispwhiteletters.Therewasnoexplanationonthebackjustawebsiteaddress.Chriswenttothewebsite.Itsstylewasidenticaltothecard'sandsaidAnytimeStartingTomorrow. ThenextdaywebsitesandblogswerefilledwitharticlestheorisingaboutAnytime.WasitashoppingwebsitelikeTaoBaoorAmazon?Ajoke?Somethingillegal?Anytime'smarketinghadworked﹣itwasahouseholdnamebeforeit'devenmadeasinglesale. WhentheopeningcamethatdayatnoontheAnytimewebsitesuddenlyhadasinglefieldthatreadWhatdoyouwant?Allyouhadtodowastypethewordsintothatboxandthenspecifyhowquicklyyouwantedyouritemdeliveredwithinonetenortwenty﹣fourhours. Bloggerswerethefirsttotesttheservice.Andtheirreviewswereglowing.WithinweeksAnytimehadbecomeapartofdailylife.NobodyusedotherdeliverysitesorthepostanymoreasAnytimewasmuchcheaperandfaster. ChrisstillwonderedwhatexactlyAnytimewas.Hetriedtofindoutwhoownedthecompanybutitwasregisteredinasmallcountrythatdidnotrequiresuchinformationtobemadepublic.Hedidfindsomeinterestingfactsthough.Anyonewhochallengedthecompanyitseemedmetwithserioustrouble.AgovernmentofficialcriticalofAnytimeforavoidingtaxwasforcedtoleavehispositionafternewsstoriessuddenlyappearedclaiminghewasdishonest.TheheadofanothercompanytakingAnytimetocourtdiedinacaraccidentjustdaysbeforethecasewastobegin. ChrisbeganmakingalistofallthepeoplewhohadsomethingterriblehappentothemafteropposingorcriticisingAnytime.Bylunchhehadmorethanonehundredexamples.Somethingwasdefinitelywrong.Chrisworkedonhislisttherestofthedayemailingpeoplewhocouldprovidemoreinformationandlookingthroughnewspaperrecords.AfterworkingthroughthenightanexhaustedChrisfinallyfellasleepathisdeskat4a.m.. WhenhewokeafewhourslatertherewasamessageflashingonhiscomputerscreenStopmakingtrouble.Chrissmiled.Hehadnointentionofstoppingnowthatheknewhewasontherighttrack. 1WhatwasonthefrontofthecardsenttoChrisLin? A.Aninvitationtoacompanyopening. B.Thewebsiteaddressofanewcompany. C.ThewordsAnytimeStartingtomorrow. D.ThewordsAnythingyouwantanytimeyouneedit. 2Whydidthecompanychoosetosendthecardstomanynewsreporters? A.Becauseitdidn'thaveenoughmoneyfortraditionaladvertising. B.Becauseitwantedtoattractthereportersascustomers. C.Sothereporterswouldwritestoriesaboutthenewcompany. D.Sopeoplewouldfindthenewcompanyinteresting. 3WhatdidChris'sresearchsuggestaboutAnytime? A.Itmaybeverydangerous. B.Itspopularitywouldsoondecrease. C.Itwasdoingbusinessallovertheworld. D.Itwasbeingwidelycriticisedbyjournalists. 4HowdidChrisfeelattheendofthestory? A.Scaredthathewouldgetintotrouble. B.Confidentthathewouldfindthetruth. C.Nervousaboutwhatthecompanywoulddo. D.Satisfiedthathehaddiscoveredthecompany'ssecret.
已知函数fx在区间[0+∞上单调递减且为偶函数则满足fx2﹣2＜f1的x的取值范围是．
已知数列{an}为等差数列且a5+a9＝则tana7等于
已知函数fx＝则函数gx＝f[fx]﹣的零点个数为
已知向量＝﹣32＝﹣1λ且∥则实数λ的值为
过点﹣40作直线L与圆x2+y2+2x﹣4y﹣20＝0交于AB两点如果|AB|＝8则L的方程为．
已知关于x的不等式|x﹣a2|+|x+2a﹣5|＜5． Ⅰ当a＝时求不等式的解集 Ⅱ若不等式有实数解求实数a的取值范围．
Chuckwasinmyhigh﹣schoolEnglishclass.1SowhenhetoldmehehadbeenacceptedintothejournalismprogramattheUniversityofMissouriIwasn'tsurprised. DuringthefirstyearatcollegeChuckstoppedbyschoolafewtimes.Wetalkedaboutourworktogetherseveralyearsbefore.Wehadraisedmoneytogetherfortwenty﹣threesickandabandonedbabies.2Itwasanactivitythatinsomewayschangedourformalrelationshipintoafriendship. InhissecondyearincollegeitwasdiscoveredthatChuckhadlungcancerandhadonlyashortwhiletolive.Soheleftschoolandcamehometobeneartohislovedones. AboutsixweekslaterChuckdied.3TheyoungestofninechildrenChuckwastalentedandfullofpromise.Moreimportantlyhewasagoodpersonajustman. WhenIwenttohisfuneralhisfatheraskedtospeakwithme.HetoldmethatbeforeChuck'sdeathhechosesixitemstoburywithhim.4 HetoldmethatChuckhadalwayskeptthepiecebecausehelikedthemessageIhadwrittentohimatthebottomofthelastpage.InthatlittlenoteIaffirmed肯定histalentasawriterandIencouragedhimtoberesponsibleforthegift. 5Histakingmynotewithhimforeverofferedmeagreatopportunityforinfluencingstudents'lives.Ifeltinspiredwithasenseofpurposethatwasgreaterthaneverteachershavethepowertoaffectheartsandmindsforalongtime. A.Hewasawriterofgreatpromise. B.Chuckhelpedtoraiseseveralthousanddollars. C.WheneverIforgetmypurposeIthinkofChuck. D.Itwasagreatlossforeveryoneespeciallyforhisfamily. E.MyspiritswereliftedupasChuckwasfilledwiththejoyoflife. F.Oneofthemwasanessayhehadwritteninmyclasssomeyearsbefore. G.IwastouchedandgratefultoChuckwhogavemeaspecialgiftthatwouldchangemylife.
如果双曲线的两个焦点分别为F1﹣30F230一条渐近线方程为y＝x那么经过双曲线焦点且垂直于x轴的弦的长度为
已知椭圆+x2＝la＞1的离心率e＝P为椭圆上的一个动点则P与定点B﹣10连线距离的最大值为
热门题库
更多
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
湘公网安备 43130202000226号