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如图所示,质量均为M的物块A、B叠放在光滑水平桌面上,质量为m的物块C用跨过轻质光滑定滑轮的轻绳与B连接,且轻绳与桌面平行,A、B之间的动摩擦因数为μ,设最大静摩擦力等于滑动摩擦力,重力加速度大小为...
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高三下学期物理《》真题及答案
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如图所示在水平桌面上叠放着质量均为M.的
B.两块木板,在木板A.的上方放着一个质量为m的物块C.,木板和物块均处于静止状态。A.
C.之间以及B.与地面之间的动摩擦因数均为μ。若用水平恒力F.向右拉动木板A.,使之从
B.之间抽出来,已知重力加速度为g。则拉力F.的大小应该满足的条件是
A.F.> μ(2m+M.)g B.F. > 2μ(m+M.)g C.F.> μ(m+2M)g
F. > 2μmg
如图所示质量为m的物块放在水平桌面上在与水平方向成θ角斜向的拉力F作用下以υ的速度向右做匀速直线运动
如图所示可看做质点的两物块A.B.质量分别为2mmA.放在光滑水平桌面上一不可伸长的柔软轻绳跨过光滑
如图所示倾角为θ=37°的光滑斜面体固定在一个小车上小车与斜面体的总质量为M.=2kg斜面体上有一个
如图所示一质量为M.的楔形木块放在水平桌面上它的顶角为90°两底角为α和βab为两个位于斜面上质量均
两质量分别为M1和M2的劈A.和B.高度相同放在光滑水平面上A.和B.的倾斜面都是光滑曲面曲面下端与
如图所示一质量为m的光滑弧形槽固定在光滑水平面上弧形槽的高为h一质量为m的物块B.静止放在光滑水平面
如图所示一块质量为M.长为l的匀质板放在很长的光滑水平桌面上板的左端有一质量为m的物块物块上连接一根
两质量均为2m的劈A.和B.高度相同放在光滑水平面上A.和B.的倾斜面都是光滑曲面曲面下端与水平面相
如图所示A.B.是两块完全相同的长木板长度均为L.质量为m两板间动摩擦因数为μ将两者边缘对齐叠放在光
如图所示一质量为M.的楔形木块放在水平桌面上它的顶角为90°两底角为α和βab为两个位于斜面上质量均
Mg+mg
Mg+2mg
Mg+mg (sinα+sinβ)
Mg+mg (cosα+cosβ)
如图所示一块质量为M.长为L.的匀质板放在很长的光滑水平桌面上板的左端有一质量为m的物块物块上连接一
如图所示质量均为M的物块AB叠放在一起放在光滑的水平桌面上.AB之间的动摩擦因数为μ物块B通过光滑定
B叠放在一起,放在光滑的水平桌面上.A.B之间的动摩擦因数为μ,物块B通过光滑定滑轮与质量为m的物块C相连.A.B之间的最大静摩擦力,重力加速度为g,轻绳与桌面平行.下列说法正确的是( )
A.要使得物块A.B之间发生相对滑动,物块C的质量m应大于
若物块A.B未发生相对滑动,物块A受到的摩擦力大小为
物块A运动的最大加速度为μg
轻绳对定滑轮的作用力大小为
如图所示一轻质弹簧弹性系数为k两端各固定一质量分别为M1=M-m和M2=M的物块A和B放在水平
如图所示在水平桌面的边角处有一轻质光滑的定滑轮一条不可伸长的轻绳绕过定滑轮分别与物块A.B.相连细绳
如图所示一块质量为M.长为l的匀质板放在很长的水平桌面上板的左端有一质量为m的物块物块上连接一根很长
一质量为M.倾角为θ的楔形木块静置在水平桌面上与桌面间的动摩擦因数为μ.一物块质量为m置于楔形木块的
质量为M.的物块静止在光滑水平桌面上质量为m的子弹以水平速度v0射入物块后以水平速度2v0/3射出则
如图所示一轻质弹簧弹性系数为k两端各固定一质量分别为M1=M-m和M2=M的物块A和B放在水平
如图所示在水平桌面上叠放着质量均为M.的
B.两块木板,在木板A.的上方放着一个质量为m的物块C.,木板和物块均处于静止状态。A.
C.之间以及B.与地面之间的动摩擦因数均为μ。若用水平恒力F.向右拉动木板A.,使之从
B.之间抽出来,已知重力加速度为g。则拉力F.的大小应该满足的条件是
A.F.> μ(2m+M.)g B.F. > 2μ(m+M.)gC.F.> μ(m+2M)g
F. > 2μmg
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﹣﹣﹣What'swrongwithyou? ﹣﹣﹣. A.I'vegotafever B.Iwearalonghair C.Ihavebeenacook D.Ilovemysister
WhenTVnewsprogramsreportwarsordisasterstheeditorsrarelyusethemosthorrifyingpicturesofdeadorwoundedvictimsbecausetheydon'twanttoupsettheirviewers.Evensoviewersareusuallywarnedinadvancethattheymayfindsomeofthesedisturbingsotheycanlookawayiftheychoose.Butthemenandwomenwhosejobsaretorecordthosescenes﹣﹣theTVcameramen﹣havenosuchchoice.Itistheirdutytowitnessthehorrorsofthewarandrecordthemnomatterhowhorrifyingandunpleasanttheymaybe.Consequentlyitisoneofthemostdangerousexposedandemotionallytaxingjobthattheworldoffers. Todaythedemandfortheirworkisrising.Theexplosionofsatellitebroadcastingand24hournewsinrecentyearshavecreatedanalmostinsatiable无法满足的demandforTVinformation.ButmajorbroadcastersandtheTVnewsagencies﹣﹣suchasReutersandWTN﹣﹣﹣haveneverhadenoughstafftomeettheworldwidedemandforup﹣to﹣datepicturessoincreasinglytheyturntoFreelanceTVcameramen. Thesefreelancecameramenareindependentoperatorstiedtonoparticularorganization.Theywillworkforanycompanywhichhiresthemforjustafewhoursorforseveralweeksinawarzone.ButifafreelancecameramanisinjuredinthecourseofthejobtheTVcompanyisnotresponsibleforhim.Thefreelancermustsurviveonhisown. TVwillalwaysneedhardvividmovingpictureswhicharefreshbutthesecompaniesfeeluncomfortablewithlargenumbersofemployeesontheirbooksexplainsNikGrowingonceforeigneditorforBritain'sChannel4NewsandnowaBBCnewspresenter. Byhiringfreelancerstheycanbuyintheskillstheyneedonlywhentheyneedthem.Italsoenablesthemtocontractouttheriskhesays. 32.TheunderlinedwordtaxinginPara1mostprobablymeans. A.demandingB.strikingC.satisfyingD.encouraging 33.TVnewsagenciesturntofreelancecamerameninorderto. A.saveexpensesandavoidrisk B.getfirsthandinformationandpictures C.lookforpicturesthatareoffinequalities D.buythehorrifyingpicturestheyneed 34.Fromthepassagewecanknowthat. A.TVcameramenshouldbegivenbetterchoiceofwork B.TVcameramenarebeingchallengedbythefreelancers C.TVcameramenhavetowitnessdisastersandkillingwhethertheylikethemornot D.TVcameramenhavetocontractouttherisksfortheircompanies 35.Theauthorofthepassageshowshisthefreelancecameramen. A.respectforB.sympathytoC.ignoranceofD.admirationto.
﹣﹣﹣Hello.I'mcallingaboutthecomputerprogrammerpositioninyourcompany.? ﹣﹣﹣Yesitis. ﹣﹣﹣I'dliketoapplyforthejob. A.Haveaseat B.Isitstillopen C.what'sthesalary D.Doyouhaveanyexperience
设NA为阿伏加德罗常数的值下列说法正确的是
﹣﹣﹣isittoday? ﹣﹣﹣It'sSunday. A.Whatdate B.Whatday C.Whattime D.Whatyear
下列有说法正确的是
﹣﹣﹣It'sbeenawonderfulparty.Thankyouverymuch. ﹣﹣﹣ A.I'mgladyouenjoyit B.Nothanks C.Itdoesn'tmatter D.Withpleasure
下列说法正确的是
﹣﹣﹣Excuseme.isitalltogether? ﹣﹣﹣Usuallyit's120yuanbuttodayit'sonlyhalfprice.
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