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小代学完电学后惊奇地发现，如图所示的电路图更换不同的元件就可以进行不同的探究实验． （1）在元件处若接上未知定值电阻可以测定未知定值电阻的阻值，其实验原理是： ； （2）在元件处若接上小灯...
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如图所示为某同学在做电学实验时的电路图的一部分根据此电路图你可判断该同学在做的实验
肯定是测定小灯泡的电功率
肯定是测定小灯泡的电阻
肯定是研究串联或并联小灯泡的电流和电压的关系
以上三个均有可能
小英同学在物理实验操作考查中做测量小灯泡的额定功率的实验.图1是该实验是电路图.1请依据图1所示的电
2.00分小丽用伏安法测量标有2.5V0.5A的小灯泡L的电功率她正确连接如图所示实物电路后闭合开
某同学测小灯泡电阻的电路如图5所示其中电源电压为4.5V他按电路图正确连接好实验电路并检查各元件完好
小代学完电学后惊奇地发现如图所示的电路图更换不同的元件就可以进行不同的探究实验． 1在元件处若接
小红同学在做测量小灯泡的额定功率实验时连接的实物电路图如图甲所示.其中小灯泡的额定电压为2.0V额定
某班在进行测定小灯泡阻值的实验中⑴某小组根据已有器材连接了实物电路如图所示请根据实物连接图在框内画出
如图所示是某实验小组选用的测定小灯泡电功率所需要的电路元件.小灯泡的额定电压为3.8V估计小灯泡的阻
RLC三个元件串联的电路图如图所示
小森家有两盏墙壁灯由一个开关控制其元件符号如图所示试将其连接成电路图
小红同学在做测量小灯泡的额定功率实验时连接的实物电路图如图所示其中小灯泡的额定电压为3.0V额定功率
小丽用伏安法测量标有2.5V0.5A的小灯泡L.的电功率她正确连接如图所示实物电路后闭合开关S.发现
在电学实验中物理实验小组的同学们按照甲图所示电路图连接好电路想同时完成电学的多个实验已知电源电压为6
某班在进行测定小灯泡阻值的实验中⑴某小组根据已有器材连接了实物电路如图所示请根据实物连接图在框内画出
小希在测额定电压为2.5V的小灯泡电阻时设计了如图甲所示的电路图.1实验时小希按电路图连接了电路闭合
如图所示是某实验小组选用的测定小灯泡电功率所需要的电路元件.小灯泡的额定电压为3.8V估计小灯泡的阻
如图所示请把图中的电学元件连接成电路图要求S1只控制L1S2控制干路
有一电学元件检测仪内部电路由电源电阻和连接导线组成M.N.是它在检测元件时所用的两个接线头如图所示.
某同学测小灯泡电阻的电路如图所示其中电源电压为4.5V他按电路图正确连接好实验电路并检查各元件完好然
小丽用伏安法测量标有2.5V0.5A的小灯泡L的电功率她正确连接如图所示实物电路后闭合开关S发现小
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在“探究加速度与力质量的关系”的实验中 1对于本实验以下说法中正确的是 A．砂和桶的总质量要远大于小车的总质量 B．每次改变小车质量后需要重新平衡摩擦力 C．实验中也可不测加速度的具体数值只要测出不同情况下加速度的比值就行了 D．若要验证“加速度与力的平方成正比”这一猜想在作图线时最好以F2为横坐标 2某同学在接通电源进行实验之前将实验器材组装如图1所示下列对此同学操作的判断正确的是 A．打点计时器不应固定在长木板的最右端而应固定在靠近定滑轮的那端 B．打点计时器不应使用干电池而应使用交流电源 C．不应将长木板水平放置而应在右端垫起合适的高度平衡摩擦力 D．小车初始位置不应离打点计时器太远而应靠近打点计时器放置 3改正实验装置后该同学顺利地完成了实验．在实验中保持拉力不变得到了小车加速度随质量变化的一组数据如下表所示 请你在图2方格纸中建立合适坐标并画出能直观反映出加速度与质量关系的图线． 4从图线可得出拉力大小为结果保留两位有效数字． 5保持小车质量不变改变砂和砂桶质量某同学根据实验数据作出了加速度a随合力F的变化图线如图3所示．此图中直线发生明显弯曲的原因是．
求下列各式字母的取值范围．
TheMetropolitanMuseumofArtMetisoneoftheworld'slargestandfinestartmuseums.Followingthesuggestedroutewillhelpyouexplorethemuseum.TheTempleofDendurThis2000﹣year﹣oldbuildingstoodneartheNileRiversurroundedbyawallthatnolongerexists.Butyoucanstillpeekthroughthegateway.Whose'house'isthis?It'snotforpeople.It'sforgods.Canyouidentifythem?Theyfaceout.Akingfacesinbringingofferings.MetSpeaksBringingtogethersomeofthemostrespectedthinkersonagivensubjectMetSpeaksfeatureslecturesdiscussionstalksfilmsandforumsinwhichcompellingvoicesexploretimelyissuesthatconnecttotheMet'sexhibitionsandpermanentcollection.Programtimesaudiencesandtopicsvary.TimetoSketchSettledownforafewminutespicksomethinginthisgalleryandhavefundrawingit.Enjoythechancetolookcarefullyasyoucreateyourownsketch.You'llbesurprisedathowmuchmoreyounoticethankstoexploringartbysketching.MetAccessMaketheMetyours!Choosefromavarietyofservicesandexcitingprogramsthataretailoredtomeettheneedsofvisitorswithdisabilities.Programtimesaudiencesandtopicsvary.AskfortheAccessInformationbrochureandAccessCalendaratInformationDesksdownloadtheAccessCalendarPDForcall212﹣650﹣2010oremailaccess@metmuseum.org.AdmissionFeeincludesadmissiontotheMainBuildingandsame﹣weekadmissiontotheCloistersmuseumandgardens.1Howmuchisrecommendedtopayfor3adultand2studentvisitors?A.﹩99B.﹩111C.﹩87D.﹩1032WhatcanyouknowabouttheTempleofDendur?A.Ahighwallissurroundingthe2000﹣year﹣oldbuildingnow.B.Akingfacesoutbringingofferingsinthetemple.C.ThebuildingisdesignedforEmperortolivein.D.TheNileRiverwitnessedthehistoryofthebuilding.3WhichofthefollowingisTRUEabouttheMet?A.IssuesconnectedwitheconomiccrisiswillbediscussedinMetSpeaks.B.Visitorscanchoosesomethinginthegalleryandhavefundrawingitonthewall.C.Disabledpeoplewillfindvariousservicesandprogramsofferedespeciallyforthem.D.Youcanemailaccess@metmuseum.orgformoreAdmissioninformation.
一质点在某段时间内做曲线运动则在这段时间内
如图所示沿水平方向做匀变速直线运动的车厢中悬挂小球的悬线偏离竖直方向37°角小球和车厢相对静止球的质量为1kg．g取10m/s2sin37°＝0.6cos37°＝0.8 1求车厢运动的加速度并说明车厢的运动情况． 2求悬线对球的拉力．
ThereisawonderfulstoryaboutJimmyDuranteoneofgreatsingers.1asktobeapartofashowforsomeoldWorldWarⅡsoldiershetoldthemhewasverybusyandhecouldaffordonlyafewminutes2hewouldcomeiftheywouldn'tmindhissingingoneshortsongandimmediatelyleavingforhisnextappointment.Ofcoursetheshow'sdirectoragreed3happy.ButwhenJimmygotonstagesomethingsurprisinghappened.Hewentthrough4shortsongandthenstayed.Theapplausegrewlouderandlouderandhekept5stay.Prettysoonhehadbeenonstage6fifteentwentyandthenthirtyminutes.Oneofhis7assistbehindthestagestoppedhimandsaid'Ithoughtyouhadtogoafterafewminutes.Whathappened?'Jimmyanswered'IdidhavetogobutIcanshowyouthereasonwhyIstayed.Youcanseefor8youifyoulookatthefrontrow.'Inthefrontrowweretwomenbothof9hadlostanarminthewar.Onehadlosthisrightarmandtheotherhadlosthisleft.Togethertheywereabletoclapandthatwasexactlywhatthey10doloudlyandcheerfully.
常用的电磁打点计时器和电火花计时器使用的是填“直流电”“交流电”正常工作时每隔s打一个点．
某校有高一学生n名其中男生数与女生数之比为65为了解学生的视力情况现要求按分层抽样的方法抽取一个样本容量为的样本若样本中男生比女生多12人则n＝
某几何体的三视图如图所示则该几何体的体积为
如图所示水平桌面上叠放着AB两物体均与桌面相对静止不动则B物体受力个数为
一辆汽车沿笔直的公路行驶第1s内通过5m的距离第2s内和第3s内各通过20m的距离第4s内又通过15m的距离求汽车在最初2s内的平均速度和这4s内的平均速度各是多少
下列说法中哪些表示的是时刻
将下列各数开平方．
已知集合A＝{x∈N|x＜3}B＝{x|x2﹣x≤0}则A∩B＝
求下列各式字母的取值范围．
判断无理数都是开方开不尽的数．判断题
如图所示为AB两运动物体的位移图象．下述说法中正确的是
Whenwegiveourkidsholidaygiftsmanyofuscan'twaittoheartheirappreciativecriesof'thankyou!'oncethewrappinggetsrippedoff.Buthere'satip:You'dbewisenottoexpectmuchgratitudefromthemforwhattheyreceive.Gratitudecanmakeushappierhealthierandevenfitter.Butdothekidsshowtheirgratitudeforthestuffwebuythem?AlltheresearchI'vedonehasconvincedmethatitwon'thappen.Onemomtoldmethatwhensheaskedher16﹣year﹣oldsontothankherforbuyinghimacellphonehesaid'Butthat'swhatmomsshoulddo.'Fromateenager'sangleit'saparent'sresponsibilitytotakecareofthefamily.AccordingtoDunhamYale'sassistantprofessorofpsychology'Whenteenagerscodeitthatwayagiftisnolongersomethinggivenfreelyandvoluntarily'﹣it'sjustmomanddadlivinguptotheirobligation.Parentsdohavetherighttodemandgoodmannersandchildrenshouldthanksincerelywhoevergivesthemsomething.Butkidscan'tknowhowblessedtheyareunlesstheyhaveabasisforcomparison.Andtheydon'tlearnthatbyaparentcomplainingthatthey'reungrateful.Weneedtogiveourchildrenthegiftofawiderworldview.Showbyexamplethatgratitudeisn'taboutstuff﹣whichultimatelycan'tmakeanyofushappyanyway.It'saboutrealizinghowluckyyouareandpayingyourgoodfortuneforward.Youcancollectallthecharitableappealsandsitdowntogetherwiththekidstogothroughthem.Yousetthebudgetforgivingandthekidsdecidehowit'sdistributed.Oncetheconversationaboutgratitudegetsstartedit'smucheasiertocontinueallyear.Alsoyoucansetupafamilyroutineatbedtimewherekidsdescribethreethingsthathavemadethemgrateful.Whenkidsgoofftocollegeyoucantextthemapictureeachweekofsomethingthatinspiresyourappreciation.Teachingchildrentofocusonthepositiveandappreciatethegoodintheirlivesisperhapsthegreatestgiftwecangivethem.Andwecanalllearntogetherthatthethingsthatreallymatteraren'tonsaleatadepartmentstore.1Howdochildrenrespondwhenreceivinggiftsfromtheirparents?A.Theyshownointerestintheirparents'gifts.B.Theycan'twaittoopentheirparents'gifts.C.Theyshowmuchgratitudetotheirparentsforthegifts.D.Theytaketheirparents'giftsforgranted.2Tomakechildrengratefulforwhattheyhaveparentsshould.A.liveuptotheirobligationB.asktheirchildrentohavegoodmannersC.teachtheirchildrenbysettinganexampleD.complaintheirchildrenareungrateful3Whatcanwelearnfromthelasttwoparagraphs?A.Nogiftsaregreaterthanteachingchildrentobepositiveandgrateful.B.Childrenoughttorealizehowluckytheyaretohaveconsiderateparents.C.ChildrenaresupposedtodecidehowtodistributetheirownmoneyD.Itiseasyforparentstostarttheconversationaboutgratitude.4What'sthepurposeoftheauthorwritingthistext?A.Toexplainthereasonwhychildrenoffernogratitudetotheirparents.B.Togiveadvicetoparentsonhowtohelpchildrendevelopgratitude.C.Toencourageparentstodothingstogetherwiththeirchildren.D.Toremindparentsoftheirresponsibilitytoeducatetheirchildren.
将下列各数开平方．36
有关滑动摩擦力的下列说法中正确的是
将下列各数开平方．0.04
一质量为5kg的滑块在F＝15N的水平拉力作用下由静止开始做匀加速直线运动若滑块与水平面间的动摩擦因数是0.2g取10m/s2问 1滑块运动的加速度是多大 2滑块在力F作用下经5s通过的位移是多大 3如果力F作用8s后撤去则滑块在撤去F后还能滑行多远
判断有理数都是有限小数．判断题
将下列各数开平方．1
求下列各式的值．
Forcollegestudentsgraduationsignalsanexcitingnewbeginning.1Manystudentswonder:WhatdoIdonow?Whatcareerisbestforme?Mostexpertadviceonchoosingcareersboilsdowntothefollowingpoints.KnowingYourselfWhatareyourinterests?Abilities?Skills?2Theresultsmaysurpriseyou!Thesecanbeusefulbutthey'renotthelastword.InvestigatingInvestigatingoccupationsismuchmoredifficult.Formostpeoplethereisn'tjustone‘right'jobbutseveralthatcouldbesatisfying.3Talktopeoplewhohaveoccupationsthatinterestyou.Findoutwhattheylikeanddislikeabouttheirjob.4Manypeoplechoosetheircareersbecausetheybelievestronglyinaparticularcause.Somemightchoosetoworkinareaslikemedicinecharityorenvironmentalprotection.Somehaveastronginterestinhistoryoraloveforthearts.5Soincaseslikethesethefieldisoftenchosenfirstratherthantheoccupationitself.Soifyou'vechosenafieldself﹣assessmentwillhelpyoufindyourplaceinit.Investsometimeandeffortandfindtherightcareerforyou.A.Tryaself﹣assessmentquiz.B.SearchthroughbooksandWebsites.C.Findingyourplace.D.Butitcanalsobringalotofuncertaintyandconfusion.E.SeriousresearchhelpsnarrowthepossibilitiesF.Researchyourchosenfieldcarefully.Whatworkneedstobedone?Whattrainingisneeded?G.Thentheymightthinkabouteducationmuseumsorartproduction.
假定你是李华你所在的学校将要举办一场春节庆祝活动.你和你的同学邀请在你校的美国交换生Tom参加.请你写一封信给Tom要点如下:1.活动内容;2.邀请Tom一起表演一个中西合璧的节目;3.活动时间:2015年农历12月30日晚7:00﹣10:004.活动地点:学校学术报告厅.注意:1.词数100左右;2.可以适当增加细节以使行文连贯;3.开头语已经为你写好.DearTomYouhavetoldmethatyouareveryinterestedinhowweChinesecelebrateourtraditionalfestivals..Wearelookingforwardtoyourreply.YourssincerelyLiHua.
求下列各数的立方根．0
一个物体做自由落体运动如图所示的四幅图中表示其v﹣t图象正确的是
求下列各数的立方根．216
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