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甲从高H处以速度v1水平抛出小球A，乙同时从地面以初速度v2竖直上抛小球B，在B尚未到达最高点之前，两球在空中相遇，则（ ）
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高三下学期物理《》真题及答案
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把一小球从离地面h=5m处以v0=10m/s的初速度水平抛出不计空气阻力g=10m/s2.求1小球在
如图所示将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面h处以初速度v0水平抛
两小球落地时的速率相同
两小球落地时，重力的瞬时功率相同
从开始运动到两球到达同一水平高度，球a动能的减少量等于球b动能的增加量
到达同一水平的高度后的任意时刻，重力对球a做功功率和对球b做功功率相等
如图所示物体1从高H处以初速度v1平抛同时物体2从地面上以速度v2竖直上抛不计空气阻力若两物体恰能在
从抛出到相遇所用的时间为H/v
2
两物体相遇时速率一定相等
两物体相遇时距地面的高度为H/2
两物体抛出时的水平距离为Hv
1
/v
2
9分把一小球从离地面h=5m处以v=10m/s的初速度水平抛出不计空气阻力g=10m/s2.求1小球
将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面高h处以初速度v0水平抛出两球
两球同时落地
相遇时两球速度大小相等
从开始运动到相遇，球a动能的减少量等于球b动能的增加量
相遇后到落地前的任意时刻，球a的机械能小于球b的机械能
如图所示将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面h处以初速度v0水平抛
）两小球落地时的速度相同 （
）两小球落地时，重力的瞬时功率相同 （
）从开始运动到两球到达同一水平高度，球a动能的减少量等于球b动能的增加量 （
）到达同一水平的高度后的任意时刻，重力对球a做功功率和对球b做功功率相等
地面上有一物体甲在甲的正上方距地面H高处有一物体乙在从静止开始释放乙的同时给甲一个初速度竖直上抛求1
如图所示在高处有个小球A以速度v1水平抛出与此同时地面上有个小球B以速度v2竖直向上抛出两小球在空中
从抛出到相遇所需的时间为h/v
1
从抛出到相遇所需的时间为h/v
2
两球抛出时的水平距离为hv
1
/v
2
两球抛出时的水平距离为hv
2
/v
1
如图所示将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面h处以初速度v0水平抛
两小球落地时的速度相同
两小球落地时，重力的瞬时功率相同
到达同一水平的高度后的任意时刻，重力对球a做功功率和对球b做功功率相等
从开始运动到两球到达同一水平高度，球a动能的减少量等于球b动能的增加量
将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面高h处以初速度v0水平抛出两球
两球同时落地
相遇时两球速度大小相等
从开始运动到相遇，球a动能的减少量等于球b动能的增加量
相遇后到落地前的任意时刻，球a的机械能小于球b的机械能
如图从高h处以初速度水平抛出小球①同时从地面以速度竖直上抛小球②不计空气阻力两小球恰在空中相遇则小球
如图所示质量为m带电量为+q的小球从距地面高度h处以一定的初速度v水平抛出在距抛出点水平距离为L处有
从空中同一点沿水平方向同时抛出两个小球它们的初速度大小分别为v1和v2初速度方向相反经过时间t＝__
甲从高H.处以速度v1水平抛出小球
，乙同时从地面以初速度v
2
竖直上抛小球
，在B.尚未到达最高点之前，两球在空中相遇，则( ). A.两球相遇时间
B.抛出前两球的水平距离
相遇时A.球速率
若
,则两球在
处相遇
两点分别以速度v1v2水平抛出两个相同的小球可视为质点它们在水平地面上方的P.点相遇假设在相遇过程中
两个小球从a、b两点同时抛出
两小球抛出的初速度v
1
=v
2
从a点抛出的小球着地时水平射程较大
从a点抛出的小球着地时重力的瞬时功率较大
如图所示将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面h处以初速度v0水平抛
两小球落地时的速度相同
两小球落地时，重力的瞬时功率相同
到达同一水平的高度后的任意时刻，重力对球a做功功率和对球b做功功率相等
从开始运动到两球到达同一水平高度，球a动能的减少量等于球b动能的增加量
如图所示将小球a从地面以初速度v0竖直上抛的同时将另一相同质量的小球b从距地面h处以初速度v0水平抛
两小球落地时的速率相同
两小球落地时，重力的瞬时功率相同
从开始运动到两球到达同一水平高度，球a动能的减少量等于球b动能的增加量
到达同一水平的高度后的任意时刻，重力对球a做功功率和对球b做功功率相等
如图所示为某一个平抛运动实验装置让小球从斜槽导轨的水平槽口抛出利用安置在槽口的光电门传感器测量小球平
甲乙两球位于同一竖直直线上的不同位置甲比乙高h将甲乙两球分别以大小为v1和v2的初速度沿同一水平方向
)同时抛出，且v1
)甲迟抛出，且v1
)甲早抛出，且v1>v2
(
)甲早抛出，且v1
甲从高H.处以速度v1水平抛出小球
，乙同时从地面以初速度v2竖直上抛小球
，在B.尚未到达最高点之前，两球在空中相遇，则( ).【2】(A.)两球相遇时间
(B.)抛出前两球的水平距离
(
)相遇时A.球速率
(
)若
,则两球相遇在
处
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阅读如图的程序框图运行相应的程序输出S的值为
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假设你是红星中学高三学生李华请根据以下四幅图的先后顺序以ANewWaytoExploretheForbiddenCity为题用英语写一篇短文向校刊英语园地投稿记述上周末你带英国朋友Jim游览故宫的全过程. 注意词数不少于60. 提示词二维码QRcode
设a∈R直线ax-y+2=0和圆θ为参数相切则a的值为．
在四边形ABCD中AD∥BCAB=2AD=5∠A=30°点E在线段CB的延长线上且AE=BE则•=．
设椭圆+=1a＞b＞0的左焦点为F上顶点为B．已知椭圆的短轴长为4离心率为． Ⅰ求椭圆的方程 Ⅱ设点P在椭圆上且异于椭圆的上下顶点点M为直线PB与x轴的交点点N在y轴的负半轴上．若|ON|=|OF|O为原点且OP⊥MN求直线PB的斜率．
设函数fx=excosxgx为fx的导函数． Ⅰ求fx的单调区间 Ⅱ当x∈[]时证明fx+gx-x≥0 Ⅲ设xn为函数ux=fx-1在区间2nπ+2nπ+内的零点其中n∈N证明2nπ+-xn＜．
下列实验所用试剂现象和结论均正确的是
下列有关物质性质与用途具有对应关系的是
BenefitsofSports Doingsportsisaphysicalmentalandsocialadventure.It'sagreatwayforchildrentotakeabreakfromacademicsandreleaseextraenergy.Italsohelpsthemleadfullerandhappierlivesasregularsportshaveproventoimproveoverallwell﹣being. Thephysicalbenefitsofdoingsportsareprobablythemostobvious.Regardlessofyourfitnesslevelwhenyoustartplayingsportsyou'llnoticeanincreaseinyouroverallfitnessonceyou'reinvolved.1Basketballplayersfocusonstrengthtrainingfootballplayersworkonspeedwhiletrackathletestrainthroughlongerruns.Thetrainingprocesshelpspromotephysicalfitnessandperformancesincompetitions. 2Playingsportscontributestomentalhealthhelpingtoincreaseconfidenceandself﹣worth.Apatonthebackhigh﹣fivefromateammateorhandshakeafteramatchreallyboostsachild'sconfidence.Wordsofpraiseandencouragementfromthecoachparentsandotherplayersraisetheself﹣worth.3Soafteragameit'sabetterideatoaskDidyouenjoythegameratherthanDidyouwin Childrenwhoparticipateinsportsmightalsobenefitfromthesocialaspectfeelingpartofagroupbuildingupaccountabilityandleadership.4Teamworkinvolvesbothbeingdependableasateammateandlearningtorelyonyourteammatestoachieveapositiveoutcome.Teamworkbreedsaccountabilityandchallengesyoutoberesponsibleforyouractions.Beingpartofateamgivesyouanopportunitytobealeader. Disciplineisanothersocialadvantage.Mostorganizedsportsrequireastricttrainingandpracticeschedule.Asastudent﹣athleteyouneedtobalanceacademicsandathletics.5 Thereisnoshortageofreasonstofindasporttogetinvolvedin.AreyoureadytogoPickoneandgetmoving! A.It'snotjustyourbodythatbenefitsfromsports. B.Thereforeplayingsportsisgoingtomakeyoumorefit. C.Butrememberachild'sself﹣worthshouldnotbedistinguishedbyvictoryorloss. D.Ifyouplaygroupsportsyou'llbepartofateamthattakesdirectionfromacoach. E.Nearlyeverysportrequiresphysicalactivityandtheskillsneededtobecompetitive. F.Amongtheselearninghowtofunctionaspartofateamisthemostimportantadvantage. G.Onlywithstrictdisciplinecanyoubesuccessfulbothintheclassroomandinthesportsfield.
MyPerfectImperfectLife AfewyearsagoIwasstandingatthebarre扶手杠waitingformyadultballetclasswhenIheardavoicebehindme.Sodoyouhavethisperfectlife Myfirstreactionwasto1whowasbeingaskedsuchanoddquestion.ThenIrememberedtherewereonlytwoofusintheroom.WhenIturned2theotherwomanwaslookingstraightatme. Ihadnoideahowtoanswerit.Wasshe3WhohasaperfectlifeSureoccasionallyIdidfindtheperfectdressortheperfectpairofshoes4neverwouldIusethatwordtodescribeanythingaboutmeormylife.Ifeltatwingeofguiltforsomehowgivingherthat5. Shewatchedme.Ifinally6towhisperaquickNo. Bythentheteacherhadenteredtheroomandturnedonthemusictostartclass.Withasighof7Imovedmyfeetintothebestposition.ButassoonasmykneesbentforourfirstposeIrealizedmy8hadbeendisturbed.Thiswoman'swordswouldn't9echoinginmythoughts. Iwantedtoknowhowshecameupwithherverymistaken10.Ifsheknewanythingaboutmylifesheneverwouldhavehadthe11toaskmethatquestion. Ididmybesttodoourfloorexercisesinfrontofthemirror.ForafewmomentsIdidn'tseetheusual12ofmyolderselfattemptingtouseabeautifulartformto13mygracefulness.Ionlysawthelittlegirlwhosefatherdiedwhenshewastwothechildwhowalkedhomefromelementaryschooleverydaytoanemptyhousewholearnedtosewherownclothesto14money. Perfect.Mylifehadbeenfarfromit. Whenthosememories15IwasleftwithavisionofthewomanIhadbecomethewoman16byallthosethingsIconsideredimperfect.Inowsawthewomanwhohadlearnedtobeself﹣reliantwho17herfamilyandherfriendswhodidn'ttakelifeforgranted.Wasthattheperfectthiswomanhaddetected Istilldon'tknowbutInolongerfeel18orfeellikeImustkeeptrackofallthedifficulttimestoprovemylifeisn't19.IfeveragainaskedwhethermylifeisperfectIwouldhaveadifferent20.BecausenowIseethatdespiteallitsimperfectionitis. 1A.notice B.understand C.wonder D.expect 2A.up B.away C.over D.around 3A.fair B.serious C.anxious D.wise 4A.but B.or C.for D.and 5A.intention B.instruction C.impression D.information 6A.learned B.managed C.agreed D.planned 7A.sadness B.surprise C.pleasure D.relief 8A.concentration B.patience C.confidence D.effort 9A.escape B.keep C.stop D.stand 10A.idea B.advice C.reason D.theory 11A.right B.urge C.excuse D.honor 12A.reflection B.preference C.appearance D.expression 13A.experience B.describe C.replace D.improve 14A.collect B.earn C.spend D.save 15A.faded B.failed C.floated D.flashed 16A.buried B.shaped C.watched D.followed 17A.changed B.welcomed C.valued D.protected 18A.worried B.guilty C.cautious D.desperate 19A.comfortable B.ordinary C.perfect D.meaningful 20A.solution B.message C.approach D.answer
GOINGTOUNIVERSITYissupposedtobeamind﹣broadeningexperience.Thatstatementisprobablymadeincomparisontotrainingforworkstraightafterschoolwhichmightnotbesoencouraging.ButisitactuallytrueJessikaGolleoftheUniversityofTübingeninGermanythoughtshewouldtrytofindout.Herresulthoweverisnotquitewhatmightbeexpected.AsshereportsinPsychologicalSciencethisweekshefoundthatthosewhohavebeentouniversitydoindeedseemtoleavewithbroaderandmoreinquiringmindsthanthosewhohavespenttheirimmediatepost﹣schoolyearsinvocational职业的trainingforwork.Howeveritwasnotthecasethatuniversitybroadenedminds.Ratherworkseemedtonarrowthem. Dr.Gollecametothisconclusionaftersheandateamofcolleaguesstudiedtheearlycareersof2095Germanyoungsters.Theteamusedtwostandardizedteststoassesstheirvolunteers.Onewasofpersonalitytraitsincludingopennessconscientiousness认真andsoon.Theotherwasofattitudessuchasrealisticinvestigativeandenterprising.Theyadministeredbothteststwice﹣oncetowardstheendofeachvolunteer'stimeatschoolandthenagainsixyearslater.Oftheoriginalgroup382wereontheintermediatetrackfromwhichtherewasachoicebetweentheacademicandvocationalroutesanditwasonthesethattheresearchersfocused.Universitybeckonedfor212ofthem.Theremaining170chosevocationaltrainingandajob. WhenitcametothesecondroundoftestsDr.Gollefoundthatthepersonalitiesofthosewhohadgonetouniversityhadnotchangedsignificantly.Thosewhohadundergonevocationaltrainingandthengotjobswerenotthatmuchchangedinpersonalityeither﹣exceptinonecrucialrespect.Theyhadbecomemoreconscientious. Thatsoundslikeagoodthingcertainlycomparedwiththecommonpublicimageofundergraduatesasabunchoflazybones.Butchangesinattitudethattheresearchersrecordedwereratherworrying.Intheuniversitygroupagainnoneweredetectable.Butthosewhohadchosenthevocationalrouteshowedmarkeddropsininterestintasksthatareinvestigativeandenterprisinginnature.Andthatmightrestricttheirchoiceofcareers. Someinvestigativeandenterprisingjobssuchasscientificresearchareindeedbeyondthedegreeless.ButmanyparticularlyinGermanywithitstraditionofvocationaltrainingarenot.Theresearchersmentionforexamplecomputerprogrammersandfinance﹣sectorworkersascareersrequiringthesetraits.IfDr.GolleiscorrectandchangesinattitudebroughtaboutbytheverytrainingGermanypridesitselfonarenarrowingpeople'schoicesthatisindeedamatterworthyofseriousconsideration. 1WhichofthefollowingcanbestreplacebeckonedforinParagraph2 A.Examined. B.Attracted. C.Organized. D.Recognized. 2Whatcanwelearnfromtheresearch A.Thedegreelesshavenotchangedinpersonalities. B.Goingtouniversityisamind﹣broadeningexperience. C.Workingstraightafterschoolnarrowspeople'sminds. D.Collegestudentspridethemselvesontheireducation. 3Accordingtothelasttwoparagraphs. A.collegestudentsenjoyaverygoodpublicimage B.theundergraduateshavechangedsignificantlyinattitude C.thedegreelessaremuchbetteratdealingwithchallengingtasks D.peopleshowlessinterestininvestigativejobsduetovocationaltraining 4Whatistheauthor'sattitudetowardsthefinding A.Concerned. B.Optimistic. C.Unclear. D.Sceptical.
冰晶石又名六氟铝酸钠Na3AlF6是白色固体微溶于水常用作电解铝工业的助熔剂．工业上用萤石主要成分是CaF2浓硫酸氢氧化铝和碳酸钠溶液通过湿法制备冰晶石某化学实验小组模拟工业上制取Na3AlF6的装置图如下该装置均由聚四氟乙烯仪器组装而成． 已知CaF2+H2SO4CaSO4+2HF↑ 1实验仪器不能使用玻璃仪器的原因是． 2仪器a的作用是装置Ⅲ的作用为． 3实验过程中装置Ⅱ中有CO2气体逸出同时观察到有白色固体析出请写出该反应的离子方程式． 4实验过程中先向装置Ⅱ中通入HF气体然后再滴加Na2CO3溶液而不是先将Na2CO3和AlOH3混合后再通入HF气体其原因是． 5装置Ⅱ反应后的混合液经过过滤可得到Na3AlF6晶体在过滤操作中确定沉淀已经洗涤干净的方法是． 6在电解制铝的工业生产中阳极的电极反应式为．
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(B.)抛出前两球的水平距离
( )相遇时A.球速率
( )若
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