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一质量为m=0.1kg的滑块(可视为质点)从倾角为θ=37°、长为L=6m的固定粗糙斜面顶端由静止释放,滑块运动到斜面底端时的速度大小为v,所用的时间为t.若让此滑块从斜面底端以速度v滑上斜面,则滑...
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高三下学期物理《》真题及答案
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如图甲所示在倾角为370的粗糙且足够长的斜面底端一质量m=2kg可视为质点的滑块压缩一轻弹簧并锁定滑
在0.15S末滑块的加速度大小为8 m/s
2
滑块在0.1-0.2s时间间隔内沿斜面向下运动
滑块与斜面间的动摩擦因数
=0.25
在滑块与弹簧脱离之前,滑块一直在做加速运动
一质量为m=0.1kg的滑块可视为质点从倾角为θ=37°长为L=6m的固定粗糙斜面顶端由静止释放滑
如图甲所示在倾角为37°的粗糙且足够长的斜面底端一质量m=2kg可视为质点的滑块压缩一轻弹簧并锁定
质量m=5kg物体可视为质点在沿斜面向上的恒定的拉力F.=60N的拉力作用下由静止开始从倾角为37°
如图所示一质量为M.的木板静止在光滑的水平面上质量为m的滑块以速度v水平滑上木板左端滑块与木板共速时
一质量M=10kg长L=2.75m的小车静止在光滑水平地面上距离小车右端s=0.25m处有一个
如图甲所示在倾角为370的粗糙斜面的底端一质量m=1kg可视为质点的滑块压缩一轻弹簧并锁定滑块与弹簧
如图所示质量M.=1kg的木板静置于倾角θ=37°足够长的固定光滑斜面底端.质量m=1kg的小物块可
如图6所示在倾角θ=30°的固定斜面的底端有一静止的滑块滑块可视为质点滑块的质量m=1kg滑块与斜面
如图所示在倾角为θ=37°的固定长斜面上放置一质量M.=1kg长度L.1=3m的极薄平板AB平板的上
光滑圆轨道和两倾斜直轨道组成如图所示装置其中直轨道bc粗糙直轨道cd光滑两轨道相接处为一很小的圆弧.
如图所示质量M.=1kg的木板静置于倾角θ=37°足够长的固定光滑斜面底端.质量m=1kg的小物块可
如图所示在倾角θ=37°的固定斜面上放置一质量M=1kg长度L=1.5m的薄平板AB.平板的上表面光
一质量M=10kg长L=2.75m的小车静止在光滑水平地面上距离小车右端s=0.25m处有一个
如图甲所示在倾角为37°的粗糙斜面的底端一质量m=1kg可视为质点的滑块压缩一轻弹簧并锁定滑块与弹
如图甲所示水平地面上静止放置一质量为M.的木板木板的左端有一个可视为质点的质量为m=1kg的滑块现给
滑块与木板间的动摩擦因数为μ
1
=0.4
木板与地面间的动摩擦因数为μ
2
=0.1
木板的长度为L=4m
木板的质量为M=1.5kg
如图所示质量为M=4kg的木板长L=1.4m静止放在光滑的水平地面上其右端静置一质量为m=1kg的小
如图甲所示在倾角为37°的粗糙足够长斜面的底端一质量m=2kg可视为质点的滑块压缩一轻弹簧并锁定滑块
一质量为m=0.1kg的滑块可视为质点从倾角为θ=37°长为L=6m的固定粗糙斜面顶端由静止释放滑
如图甲所示在倾角为37°的粗糙且足够长的斜面底端一质量m=2kg可视为质点的滑块压缩一轻弹簧并锁定滑
在0.15 s末滑块的加速度为8 m/s
2
滑块在0.1~0.2 s内沿斜面向下运动
滑块与斜面间的动摩擦因数μ=0.25
在滑块与弹簧脱离之前,滑块一直在做加速运动
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已知l1x﹣my+3=0l2x+y+1=0若l1∥l2则m=
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为比较甲以两名篮球运动员的近期竞技状态选取这两名球员最近五场比赛的得分制成如图所示的茎叶图有以下结论 ①甲最近五场比赛得分的中位数高于乙最近五场比赛得分的中位数 ②甲最近五场比赛得分平均数低于乙最近五场比赛得分的平均数 ③从最近五场比赛的得分看乙比甲更稳定 ④从最近五场比赛的得分看甲比乙更稳定. 其中所有正确结论的编号为
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在等差数列{an}中a5=33公差d=3则201是该数列的第项.
在△ABC中角ABC的对边分别为abc已知向量=cosBsinA﹣B向量=2cos2﹣sinB5=5cosB+3. 1求cosA的值 2若a=4b=5求向量在方向上的投影.
已知点A01B32向量=
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Bitcoinandotherso﹣calledcryptocurrencies加密货币havebeenalloverthenewslately.Apparentlytheideaofmoneythat'snottiedtoaspecificbankoraspecificcountryisappealingtomany.Andmoreandmorepeopleshowtheirinterestinthesecryptocurrencies. Inthepastmoney'smakeupvariedfromplacetoplace.Variousobjectshaveservedascurrencyincludingbeadsivoryandshells.InWestAfricabracelets手镯ofbronzeorcopperconsideredtohavegreatworthwereusedascashespeciallyifthebusinesswasassociatedwiththeslavetradethere.ThroughoutthecolonialperiodwhentobaccowasplantedgreatlyandbroughtbigeconomicbenefitsitwasusedinplaceofcoinsorpaperbillsinVirginiaMarylandandNorthCarolina. TodayonMalaitaanislandinthePacificaspecifictypeofshellstillservesascurrencyandsomepeoplethereareevenhoardingitjustlikeBitcoinconvincedthatonedayitwillmakethemwealthybeyondimagination.MaryBrunoashopownerfromthesmalltownofAukionMalaitasaidoneofdarkershellsmightgetyouabouttwocansoftuna金枪鱼butoneofredshellsmightgetenoughtunatofeedabigfamilyforalongtime.Justlikeaplacethatcreatescoinsthere'sonlyoneplaceontheislandwheretheshellswhicharepolishedandstrungtogethertoform3﹣foot﹣longropesaremade.TheredwhiteandblackshellsallcomefromLangaLangaLagoonwhereartificialislandswerebuiltbylocalstoescapefromthewarlongago.Oncetrappedontheseislandslocalsneededacurrencytouseamongthemselvesandsotheshellcurrencywasborn. Justlikecryptocurrenciestherearethosewhothinktheislandersaresmarttoinvestinthistypeofmoneywhichisreportedtohaveriseninvalueoverthelastthreedecades.Itmightseemstrangebutwhatisapileofdollars?It'sjustaspeciallyprintedpieceofpaperthatwe'veassignedvalueto﹣﹣andprobablylessdurable耐用overtimethanthoseshells. 1WhatdoestheauthorintendtotellusinParagraph1? A.Atrendofcurrency. B.People'sinterestinBitcoin. C.Banks'controlovercurrency. D.Aneffectofcryptocurrencies. 2TheunderlinedwordhoardinginParagraph3canbereplacedby. A.selling B.polishing C.collecting D.hiding 3Accordingtothispassagewhatdeterminesthevalueofshells? A.Theircolor. B.Theirshape. C.Theirsource D.Theirweight. 4Whatistheauthorsattitudetowardstheislanders'investinginshells? A.Doubtful. B.Objective. C.Uncaring. D.Approving.
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