如图4-61所示匀质杆AB长ι,质量为C。点D距点A为。杆对通过点D且垂直于AB的轴y的转动惯量为()。https://assets.asklib.com/psource/2015103014400581399.jpg
A .https://assets.asklib.com/psource/201510301440198304.jpg
B .https://assets.asklib.com/psource/2015103014403321493.jpg
C .https://assets.asklib.com/psource/2015103014405072692.jpg
D .https://assets.asklib.com/psource/2015103014410294262.jpg
相似题目
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图示匀质杆AB长ι,质量为m。点D距点A为1/4L。杆对通过点D且垂直于AB的轴y的转动惯量为:()
https://assets.asklib.com/psource/2016071917404675162.jpg
https://assets.asklib.com/psource/2016071917404919562.jpg
A . A
B . B
C . C
D . D
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匀质杆置于光滑水平面上,两端分别作用拉力F
1
和F
2
,并且F
1
>F
2
,如图4-7所示。问:A与B、C处截面上,哪个截面张力较大()。
https://assets.asklib.com/images/image2/201705111019432551.jpg
A . A截面大
B . B截面大
C . C截面大
D . 全相同
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(2011)均质杆AB长为ι,重为W,受到如图所示的约束,绳索ED处于铅垂位置,A、B两处为光滑接触,杆的倾角为α,又CD=ι/4,则A、B两处对杆作用的约束力大小关系为:()https://assets.asklib.com/psource/2015110408451054513.png
A . FNA=FNB=0
B . B.FNA=FNB≠0
C . FNA≤FNB
D . FNA≥FNB
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质量为m,长为2L的均质杆初始位于水平位置,如图所示。A端脱落后,杆绕轴B转动,当杆转到铅垂位置时,AB杆B处的约束力大小为()。
https://assets.asklib.com/psource/2016071917100596322.jpg
https://assets.asklib.com/psource/2016071917100730435.jpg
A . A
B . B
C . C
D . D
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如图所示,均质杆AB,质量为M,长为l,A端连接一质量为m的小球,并一起以角速度ω绕O轴转动,则此系统对O轴的动量矩和动能T为()。https://assets.asklib.com/psource/2015103013290992251.jpg
A .https://assets.asklib.com/psource/2015103013292779880.jpg
B .https://assets.asklib.com/psource/201510301329465757.jpg
C .https://assets.asklib.com/psource/2015103013300053333.jpg
D .https://assets.asklib.com/psource/2015103013301585099.jpg
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杆AB长为ι,质量为m,图4-64所示瞬时点A处的速度为ν,则杆AB动量的大小为()。https://assets.asklib.com/psource/2015103014425046008.jpg
A . ['mνB . 2mνC .https://assets.asklib.com/psource/201510301443098930.jpg
D .https://assets.asklib.com/psource/2015103014431950221.jpg
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均质细直杆AB长为ι,质量为m,以匀角速度ω绕O轴转动,如图4-69所示,则AB杆的动能为()。https://assets.asklib.com/psource/2015103014493433796.jpg
A .https://assets.asklib.com/psource/2015103014503984624.jpg
B .https://assets.asklib.com/psource/2015103014505084240.jpg
C .https://assets.asklib.com/psource/2015103014510485319.jpg
D .https://assets.asklib.com/psource/2015103014512148828.jpg
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如图4-57所示平面机构中,AC∥BD,且AC=BD=d,均质杆AB的质量为m,长为l。AB杆惯性力系向AB杆质心C简化结果是()。https://assets.asklib.com/images/image2/2017051109460533960.png
A .https://assets.asklib.com/images/image2/201705110946166076.png
B .https://assets.asklib.com/images/image2/2017051109461984184.png
C .https://assets.asklib.com/images/image2/2017051109462167686.png
D .https://assets.asklib.com/images/image2/2017051109462264555.png
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如图4-79所示水平杆AB=ι,质量为2m,剪断绳BC瞬间,A处约束力为()。https://assets.asklib.com/psource/2015103015071093366.jpg
A . ['2mgB . mgC .https://assets.asklib.com/psource/2015103015072531074.jpg
D .https://assets.asklib.com/psource/2015103015073718551.jpg
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均质杆AB长L,质量m,质心为C。点D距点A为1/4L。杆对通过点D且垂直于AB的轴y的转动惯量为:()
https://assets.asklib.com/psource/2016071916560856442.jpg
https://assets.asklib.com/psource/2016071916560610651.jpg
A . A
B . B
C . C
D . D
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质量为m,长为2ι的均质杆初始位于水平位置,如图所示。A端脱落后,杆绕轴B转动,当杆转到铅垂位置时,AB杆B处的约束力大小为:()
https://assets.asklib.com/psource/2016071917342783578.jpg
https://assets.asklib.com/psource/2016071917342669276.jpg
A . A
B . B
C . C
D . D
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质量为m的两小球带等量同号电荷g,现用长为ι的细线悬挂于空中O点,如图7-1所示,当小球平衡时,测得它们之间的水平距离为x,此时绳子的张力为()。https://assets.asklib.com/psource/2015110110583655067.jpg
A .https://assets.asklib.com/psource/2015110110585186645.jpg
B .https://assets.asklib.com/psource/2015110110590351835.jpg
C .https://assets.asklib.com/psource/2015110110591689042.jpg
D .https://assets.asklib.com/psource/201511011059284507.jpg
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质量为m,长为2ι的均质细杆初始位于水平位置,如图所示。A端脱落后,杆绕轴B转动,当杆转到铅垂位置时,AB杆角加速度的大小为:()
https://assets.asklib.com/psource/2016071917373619874.jpg
https://assets.asklib.com/psource/201607191737384184.jpg
A . A
B . B
C . C
D . D
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如图所示,A点有电荷+q,B点有电荷-q,AB=2L,OCD是以B为中心,L为半径的半圆,将单位正电荷从O点沿OCD移到D点,电场力做功为( )40068d3472451d4a41fdae8b32c069ec.png
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质量均为m的匀质细杆AB,BC和匀质圆盘CD用铰链连接在一起并支撑如图。已知AB=BC=CD=2R,图示瞬时A、B、C处在一水平直线位置上而CD铅直,且AB杆以角速度转动,则该瞬时系统的动量的大小为( )(在图中画出该动量)。/ananas/latex/p/309b35a60af50995d280bd6bb68178c9b55.png
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质量为m,长为l的等截面均质杆AB在图示位置,已知角速度和角加速度分别为ω、ε,其转向如图所示,则杆的动能T为()。
<img src='https://img2.soutiyun.com/ask/uploadfile/5088001-5091000/0a17aa9b2811a784c73e007ea80e7b60.jpg' />
A.<img src='https://img2.soutiyun.com/shangxueba/ask/5088001-5091000/5089780/onerrorimg.jpg' />
B.<img src='https://img2.soutiyun.com/shangxueba/ask/5088001-5091000/5089780/onerrorimg.jpg' />
C.<img src='https://img2.soutiyun.com/shangxueba/ask/5088001-5091000/5089780/onerrorimg.jpg' />
D.<img src='https://img2.soutiyun.com/shangxueba/ask/5088001-5091000/5089780/onerrorimg.jpg' />
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已知轮子半径是r,对转轴O的转动惯量是I0;连杆AB长l,质量是m1,并可看成匀质细杆;滑块A质量是m2,可沿光滑铅垂导轨滑动。滑块在最高位置(θ=0°)受到微小扰动后,从静止开始运动,如图所示,不计摩擦,当滑块到达最低位置时轮子的角速度ω为()。
<img src='https://img2.soutiyun.com/shangxueba/ask/2874001-2877000/2876527/ct_jggysbnjxj_jggysbnjxchoose_0317(106).jpg' />
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质量为m,长为2ι的均质细杆初始位于水平位置,如图所示。A端脱落后,杆绕轴B转动,当杆转到铅垂位置时,AB杆角加速度的大小为:()
<img src='https://img2.soutiyun.com/shangxueba/ask/18627001-18630000/18627235/2016071917373619874.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18627001-18630000/18627235/201607191737384184.jpg' />
A.A
B. B
C. C
D. D
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匀质杆质量为m,长0A=ι,在铅垂面内绕定轴O转动。杆质心C处连接刚度系数κ较大的弹簧,弹簧另端固定。图示位置为弹簧原长,当杆由此位置逆时针方向转动时,杆上A点的速度为νA,若杆落至水平位置的角速度为零,则νA的大小应为()。<img src='https://img2.soutiyun.com/ask/uploadfile/3921001-3924000/580826af837126efcaa7299d9b8c14b2.jpg' />
A.σc/3
B.σc/2
C.3σc/5
D.σc
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如图所示两等长杆AB与BC在点B用铰链连接,又在杆的D,E两点连一弹簧。弹簧的刚度系数为k,当距离AC等于a时,弹簧内拉力为零。点C作用一水平力F,设AB=l,BD=b,杆重不计。求系统平衡时距离AC之值。
<img src='https://img2.soutiyun.com/ask/uploadfile/5091001-5094000/3f6f197d5ebc4a28c97f34903443ec0a.jpg' />
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均质杆AB,质量为m,两端用张紧的绳子系住,绕轴O转动,如图所示。则杆AB对O轴的动量矩______。<img src='https://img2.soutiyun.com/ask/uploadfile/5094001-5097000/25bfc49ae27d7131ad38fd12a3d87f54.png' />
A.<img src='https://img2.soutiyun.com/ask/uploadfile/5094001-5097000/696b847dfa1d71b0323af3930eb0e005.png' />
B.<img src='https://img2.soutiyun.com/ask/uploadfile/5094001-5097000/2438d36d0fbd3b3cdb1852a2c06af9f1.png' />
C.<img src='https://img2.soutiyun.com/ask/uploadfile/5094001-5097000/8bee82ebda68514da0767c11c2a13e8d.png' />
D.<img src='https://img2.soutiyun.com/ask/uploadfile/5094001-5097000/a8d077fd110f8153cb7d33f4a5abc555.png' />
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一根质量为m0,长为l的匀质细杆,一端连接一个质量为m的小球,细杆可绕另一端0在竖直平面内转动。现将小球从水平位置A向下抛射,使球恰好能通过最高点C,如图所示。求:
(1)下抛初速度v0。
(2)在最低点B时,细杆对球的作用力。
<img src='https://img2.soutiyun.com/ask/2020-07-08/963065468823554.png' />
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杆AB长为ι,质量为m,图4-64所示瞬时点A处的速度为ν,则杆AB动量的大小为()。
<img src='https://img2.soutiyun.com/shangxueba/ask/19098001-19101000/19099118/2015103014425046008.jpg' />
A. ['mν
B. 2mν
C.<img src='https://img2.soutiyun.com/shangxueba/ask/19098001-19101000/19099118/201510301443098930.jpg' />
D.<img src='https://img2.soutiyun.com/shangxueba/ask/19098001-19101000/19099118/2015103014431950221.jpg' />
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行星齿轮机构如图所示,曲柄OA带动行星齿轮II在固定齿轮I上滚动。巳知曲柄的质量为m1,且可认为是匀质杆。齿轮II的质量为m2,半径为r, 且可认为是匀质圆盘,至于齿轮I的半径则为R,今在曲柄上作用一不变的力矩M,如重力的作用可以略去不计,试用拉格朗日方程研究此曲柄的运动。