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如图所示,一竖直圆弧形槽固定于水平地面上,O为圆心,AB为沿水平方向的直径.若在A点以初速度v1沿AB方向平抛一小球,小球将击中槽壁上的最低点D点;若A点小球抛出的同时,在C点以初速度v2沿BA方向...
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高三下学期物理《》真题及答案
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如图圆弧形凹槽固定在水平地面上其中ABC是位于竖直平面内以O.为圆心的一段圆弧OA与竖直方向的夹角为
如图9-44所示水平地面上有一段光滑的圆弧形槽弧的半径为R弧右侧边缘外放一小球A在圆弧的圆心处放一个
如图所示一半径为R.的圆弧形轨道固定在水平地面上O.为最低点轨道末端
B.两点距离水平地面的高度分别为h和2h,h<
两点同时由静止释放甲、乙两个完全相同的小球。不计轨道与球之间的摩擦及空气阻力,不计两球碰撞过程中的机械能损失。则 A.碰撞后乙球经过
的时间再次回到点O. B.碰撞后乙球落到水平地面上时的速度大小为
碰撞后甲球落到水平地面上时的速度大小为
碰撞的瞬间前后相比较,轨道对地面的压力变小
如图所示圆弧形凹槽固定在水平地面上其中ABC是以O.为圆心的一段圆弧位于竖直平面内现有一小球从水平桌
点沿圆弧的切线方向进入轨道。OA与竖直方向的夹角为θ
1
,PA与竖直方向的夹角为θ
2
。下列说法正确的是( )
A.tanθ
1
tanθ
2
=2
cotθ
1
tanθ
2
=2
cotθ
1
cotθ
2
=2
tanθ
1
cotθ
2
=2
如图所示一个圆弧形光滑细圆管轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接地面与
如图所示一个圆弧形光滑细圆管轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接地面与
10分如图所示一个圆弧形光滑细圆管轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接
如图所示一个圆弧形光滑细圆管轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接地面与
2017云贵川百校大联考如图所示固定在竖直面内半径均为R的两段四分之一光滑圆弧轨道ABCD与粗糙水平
O
2
E.>
R
小球两次在C 点的速度均为
小球第二次从B点运动到F点的时间比第一次从B点运动到E点的时间长
若再次改变小球的高度,小球到达B点时的速度为
,则小球在该点时对圆弧轨道的压力大小为2mg
如图所示圆弧形凹槽固定在水平地面上其中ABC是以O.为圆心的一段圆弧位于竖直平面内现有一小球从水平桌
点沿圆弧的切线方向进入轨道。OA与竖直方向的夹角为θ
1
,PA与竖直方向的夹角为θ
2
。下列说法正确的是( )
A.tanθ
1
tanθ
2
=2
tanθ
1
/tanθ
2
=2
tanθ
1
tanθ
2
=1/2
tanθ
1
/tanθ
2
=1/2
如图所示圆弧形凹槽固定在水平地面上其中ABC是以O.为圆心的一段圆弧位于竖直平面内现有一小球从一水平
点沿圆弧的切线方向进入轨道。OA与竖直方向的夹角为θ
1
,PA与竖直方向的夹角为θ
2
。下列说法正确的是 A.tanθ
1
tanθ
2
=2
cotθ
1
tanθ
2
=2
cotθ
1
cotθ
2
=2
tanθ
1
cotθ
2
=2
如图所示一个圆弧形光滑圆管轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接地面与圆
如图所示光滑轨道固定在竖直平面内其中BCD为细管AB只有外轨道AB段和BC段均为半径为R的四分之一圆
如图所示一半径为R.的圆弧形轨道固定在水平地面上O.为最低点轨道末端
B.两点距离水平地面的高度分别为h和2h,h<
两点同时由静止释放甲、乙两个完全相同的小球。不计轨道与球之间的摩擦及空气阻力,不计两球碰撞过程中的机械能损失。 A.碰撞后乙球经过
的时间再次回到点O. B.碰撞后乙球落到水平地面上时的速度大小为
碰撞后甲球落到水平地面上时的速度大小为
碰撞后的瞬间两球对轨道的压力之和小于碰撞前的瞬间两球对轨道的压力之和
如图圆弧形凹槽固定在水平地面上其中ABC是位于竖直平面内以O为圆心的一段圆弧OA与竖直方向的夹角为
如下图所示在水平地面上有一段圆弧形槽弧的半径为R.所对圆心角小于10°现在圆弧右侧边缘放一个小球A.
12分如图所示一个圆弧形光滑细圆轨道ABC放置在竖直平面内轨道半径为R.A.点与水平地面AD相接地面
如图所示一个圆弧形光滑轨道ABC放置在竖直平面内轨道半径为R.在A.点与水平地面AD相接地面与圆心O
如图圆弧形凹槽固定在水平地面上其中ABC是位于竖直平面内以O为圆心的一段圆弧OA与竖直方向的夹角为
如图所示质量为M.的弧形槽静止在光滑的水平面上弧形槽的光滑弧面底端与水平地面相切一个质量为m的小物块
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圆ρ=5cosθ﹣5sinθ的圆心坐标是
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如图是某超市一年中各月份的收入与支出单位万元情况的条形统计图.已知利润为收入与支出的差即利润=收入一支出则下列说法正确的是
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雷达图RadarChart又可称为戴布拉图蜘蛛网图SpiderChart是财务分析报表的一种现可用于对研究对象的多维分析如图为甲乙两人五个方面的数据雷达图则下列说法不正确的是
已知点27在幂函数fx=t﹣2xa的图象上则t+a=
用反证法证明命题三角形的内角至少有一个角不大于60°时应假设
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在直角坐标系xOy中直线l的参数方程为t为参数曲线C的参数方程为α为参数. Ⅰ已知在极坐标系与直角坐标系xOy取相同的长度单位且以原点O为极点以x轴正半轴为极轴中点P的极坐标为3判断点P与直线l位置关系 Ⅱ设点Q是曲线C上的一个动点求它到直线l的距离的最小值.
设fx=3ax2+2bx+c若a+b+c=0f0>0f1>0. 求证a>0.
论语•学路篇中说“名不正则言不顺言不顺则事不成事不成则礼乐不兴礼乐不兴则刑罚不中刑罚不中则民无所措手足所以名不正则民无所措手足.”上述推理用的是
在吸烟与患肺病这两个分类变量的计算中下列说法正确的是
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假定你是李华你校英文报正在举行建国70周年看生活方式变迁主题征文活动.请你根据以下要点提示投稿 1.生活方式的变化至少写两点变化 2.变化给人们带来的好处 3.你的感受. 注意词数100左右开头已为你写好不计入文章总词数 可以适当增加细节以使行文连贯. Withtheadvanceofmoderntechnologynewinventionsanddevelopmentsarerisinginourdailylife
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将十进制数37化为二进制数根据二进制数“满二进一”的原则采用“除二取余法”得如下过程37=2×18+118=2×9+09=2×4+14=2×2+02=2×1+0把以上各步所得余数从后面到前面依次排列从而得到37的二进制数为100101记作372=100101类比上述方法根据三进制数“满三进一”的原则则583=
已知复数z=x2﹣1+x2﹣x﹣2i为纯虚数则实数x=
在同一平面直角坐标系中满足由曲线x2+y2=1变成曲线的一个伸缩变换为
已知复数z1=在复平面内对应的点为A复数z2在复平面内对应的点为B若向量与虚轴垂直则z2的虚部为.
At200amthisFridaymorningIreceivedatextmessagefromafriendaskingifIhadanySmileCardsinSpanish.Iimmediately1thatIdidn'thaveany.HoweverIaskedherwhyshewantedthem2inSpanishandifSmileCardsinEnglishwouldbe3. Tomy4shesaidshehadbeenoneofthefewselectedbyherhighschooltogoonaservicetriptoPanama.ShewantedtosharetheconceptofSmileCardsand5. Withchildreninthevillages.Iwastotally6andexcitedwithhearingthenews!SoIdecidedtostop7andcallhertogetmoreinformationaboutherservicetrip.Shewasleavingthatsamedayatmidnight.ItoldherIwould8aboutitandletherknowbyafternoonifIcould9anyinSpanish.Nolucktillmidday. 10therewasonetranslationoftheoriginalEnglishSmileCardinSpanishonline.Carryingthe11Iheadedovertoalocalprintingshopandaskedtheemployeeifhecouldprint100SmilecardsinSpanishby600pm.Theemployeesaiditwas12togetitsincehewasworkingbyhimselfandwas13withorders.DisappointedI14theEnglishversionoftheSmileCardandexplainedmy15tohim.Evenhewasexcitedandpromisedthathe'dtryhisbesttogetthem16. Whentheclock17ninetheSpanishSmileCardswereready.ToexpressmygratitudeIbroughtsomeIndianfoodtothisemployeetothankhimforhis18.Iquicklygotinto19mycarandmyfiend'shouseandshewaspatientlystandingoutsideawaitingmy20.Wedidn'tgetachancetohaveaproperconversationbutthatwasgoodenough. 1A.believed B.imagined C.responded D.noticed 2A.specially B.universally C.frequently D.officially 3A.accurate B.acceptable C.valuable D.flexible 4A.surprise B.puzzle Cdisappointment D.amusement 5A.solution B.amazement C.curiosity D.kindness 6A.confused B.rocked C.concerned D.satisfied 7A.talking B.travelling C.discussing D.texting 8A.worry B.bargain C.enquire D.quarrel 9A.takechargeof B.search C.control D.getholdof 10AStrangely B.Fortunately C.Obviously D.Hopefully 11A.excitement B.dream C.courage D.doubt 12A.necessary B.worthwhile C.impossible D.natural 13A.pleased B.curious C.occupied D.nervous 14A.tookout B.gaveout C.madeup D.usedup 15A.identity B.situation C.concept D.difficulty 16A.designed B.decorated C.written D.printed 17A.recorded B.exposed C.struck D.shook 18A.commitment B.judgement C.encouragement D.assessment 19A.steppedforward B.heldon C.showedup D.spedoff 20Aapology B.arrival C.explanation D.participation
假定你是高一的李华得知第七届世界军人运动会the7thCISMWorldGames将于2019年10月18日至27日在中国湖北武汉举行.请写一封信申请去做志愿者volunteer内容包括 1写信目的 2个人优势 3能做的事. 注意 1词数100左右 2可以适当增加细节以使行文连贯 3申请信的开头已给出不计入字数. DearSir/Madam IamLiHuaastudentstudyinginakeymiddleschool.
下列命中①若实数a>b则a+i>b+i②由圆的性质类比出球的性质是合情推理③在回归直线方程=﹣0.2x+11中当变量x每增加一个单位时变量一定减少0.2单位④相关系数r越大则两个变量相关性越强.正确的个数是
执行如图所示的程序框图如果输出的a值大于2019那么判断框内的条件为
Iamoftenaskedwhyreadingissoimportant.Icouldn'thelpbutquote引用TyrionLannisterfromthebook‘Gameofthrones'writtenbyGeorgeRRMartin.ThisconversationfollowswhenTyrionwasaskedwhyhereadssomuch Ihavearealisticgraspofmyown1andweaknesses.Mymindismy2.MybrotherhashisswordKingRoberthashiswarhammer战锤andIhavemymind…andamindneedsbooks3aswordneedsawhetstone磨石ifitistokeepthesword4.Tyriontappedtheleathercoverofthebook.That'swhyIreadso5JonSnow. ToquoteGeorgeRRMartinAreaderlivesathousandlivesbeforehedies.Themanwhoneverreadslivesonly6. Anoldfarmerlivedonafarminthemountainswithhisyounggrandson.EachmorningGrandpawasupearlysitting7thekitchentablereadinghisbook.Onedaythegrandsonasked‘Grandpa!ItrytoreadthebookjustlikeyoubutIdon't8itandwhatIdounderstandIforget9Iclosethebook.Whatgooddoesreadingthebookdo?' Thegrandfatherquietly10andrepliedTakethiscoalbasketdowntotheriverandbringmebackabasketof11. Theboydidashewastoldbutallthewater12beforehegotbacktothehouse.ThegrandfatherlaughedandsaidYou'llhavetomovealittlefasternexttimeand13himtotheriverwiththebaskettotryagain.Thistimetheboyranfasterbutagainthebasketwasemptybeforehereturnedhome.Outof14hetoldhisgrandfatherthatitwasimpossibletocarrywaterinabasketandhewenttogetabucket15.TheoldmansaidIdon'twantabucketofwaterIwantabasketofwater.You'rejustnottryinghardenoughandhewentoutthedoortowatchtheboytryagain.Atthispointtheboyknewitwas16buthewantedtoshowhisgrandfatherthatevenifheranasfastashecouldthewaterwouldleakoutbeforehegotbacktothehouse.Theboyagaindippedthebasketintotheriverandranhardbutwhenhe17hisgrandfatherthebasketwasagainempty.HesaidSeeGrandpait's18! Soyouthinkitisuseless?theoldmansaidLookatthebasket.Theboylookedatthebasketandforthefirsttimerealizedthatthebasketwas19.Ithadbeentransformedfromadirtyoldcoalbasketandwasnowcleaninsideandout. Sonthat'swhathappenswhenyoureadthebook.Youmightnotunderstandorremembereverythingbutwhenyoureadityouwillbechangedinsideand20!!! 1A.wisdom B.strengths C.shortcomings D.disadvantages 2A.tool B.weapon C.equipment D.instrument 3A.as B.before C.while D.because 4A.fast B.sharp C.smooth D.important 5A.few B.much C.little D.many 6A.it B.one C.that D.those 7A.at B.down C.along D.besides 8A.confirm B.believe C.understand D.convince 9A.quickly B.finally C.immediately D.frequently 10A.turnedup B.turnedout C.turnedaway D.turnedaround 11A.fish B.coal C.earth D.water 12A.wentout B.flewout C.droppedout D.leakedout 13A.sent B.asked C.ordered D.required 14A.breath B.control C.curiosity D.consideration 15A.even B.though C.instead D.however 16A.hopeful B.necessary C.impossible D.important 17A.heard B.arrived C.glanced D.approached 18A.useless B.hopeless C.helpless D.worthless 19A.same B.equal C.strange D.different 20A.out B.around C.anywhere D.everywhere
已知i是虚数单位且复数z满足z+23+i=10. Ⅰ求z及z2 Ⅱ若z•a+2i是纯虚数求实数a的值.
LastsummerIwenttooneoftheworld'smostfamoushistoricalplacestheForbiddenCityinBeijingwhatwasthehomeoftheemperorsofthelasttwodynastiesintheChinatheMingandQingDynasties.Thepalacehas10.000rooms.InMandarintheForbiddenCityiscallingthePurpleForbiddenCity.Howeverthecolorofthepalacehimselfisnotpurple.ThecolorpurplestandsthepowerofthegreatemperorsofChina.Itwassoasacredplacethatcommonpeoplecouldnotevendreamofevergothere.TheemperorsalsohavesomeofthelargerfestivalcelebrationsattheForbiddenCity.NowtheForbiddenCityisknownasahistoricalsiteformillionsoftouristfromallovertheworld.
已知函数fx=|x﹣2|. Ⅰ求不等式fx>6﹣|2x+1|的解集 Ⅱ设ab∈2+∞若fa+b=6求的最小值.
点M的直角坐标是则点M的极坐标为
观察下列几个三角恒等式 ①tan10°tan20°+tan20°tan60°+tan60°tan10°=1 ②tan13°tan35°+tan35°tan42°+tan42°tan13°=1 ③tan5°tan100°+tan100°tan﹣15°+tan﹣15°tan5°=1. 一般的若tanαtanβtanγ均有意义你可以归纳出结论
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