如图4-72所示,质量为m1的均质杆OA,一端铰接在质量为m2的均质圆盘中心,另一端放在水平面上,圆盘在地面上作纯滚动。圆心速度为ν,则系统的动能为()。https://assets.asklib.com/psource/2015103014575117844.jpg
A .https://assets.asklib.com/psource/2015103014581873942.jpg
B .https://assets.asklib.com/psource/2015103014583464941.jpg
C .https://assets.asklib.com/psource/2015103014590974949.jpg
D .https://assets.asklib.com/psource/201510301459195520.jpg
相似题目
-
如图所示,均质杆OA,重为P,长为l,可在铅直平面内绕水平固定轴O转动。杆在图示铅直位置时静止,欲使杆转到水平位置,则至少要给杆以角速度ω为()。https://assets.asklib.com/psource/2015103013385857936.jpg
A .https://assets.asklib.com/psource/2015103013391695325.jpg
B .https://assets.asklib.com/psource/2015103013393034152.jpg
C .https://assets.asklib.com/psource/2015103013394349804.jpg
D .https://assets.asklib.com/psource/2015103013395676362.jpg
-
质量为m1,半径为r的均质圆盘上,沿水平直径方向焊接一长为
https://assets.asklib.com/psource/2015110209540868947.png
,质量为m2的均质杆AB。整个物体绕圆盘中心O以角速度w转动,该物体系统的总动量的大小为()。
https://assets.asklib.com/psource/2015110209544972304.png
A . (m1r+m2https://assets.asklib.com/psource/2015110209540868947.png
)wB .https://assets.asklib.com/psource/2015110209545823493.png
C .https://assets.asklib.com/psource/2015110209550258813.png
D .https://assets.asklib.com/psource/201511020955055656.png
-
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
-
质量为m,长度为L的均质杆铰接于O点,A端固结一质量为m的质点如图示。当OA杆以角速度w绕O轴转动时,系统对轴O的动量矩的大小为()。
https://assets.asklib.com/psource/2016071916413125244.jpg
https://assets.asklib.com/psource/2016071916413655485.jpg
A . A
B . B
C . C
D . D
-
如图所示,均质杆OA,重为P,长为2l,绕过O端的水平轴在铅直面内转动,转到角时,有角速度ω和角加速度ε,则此时铰链O处约束力T和N为()。https://assets.asklib.com/psource/2015103013262666683.jpg
A .https://assets.asklib.com/psource/2015103013265422087.jpg
B .https://assets.asklib.com/psource/2015103013271915309.jpg
C .https://assets.asklib.com/psource/2015103013280163083.jpg
D .https://assets.asklib.com/psource/2015103013283476838.jpg
-
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
-
质量为m,长度为
https://assets.asklib.com/psource/2015110209560869610.png
的均质杆铰接于O点,A端固结一质量为m的质点如图示。当OA杆以角速度w绕O轴转动时,系统对轴O的动量矩的大小为()。
https://assets.asklib.com/psource/2015110209562211921.png
A .https://assets.asklib.com/psource/2015110209562827248.png
B .https://assets.asklib.com/psource/2015110209563284479.png
C .https://assets.asklib.com/psource/2015110209563555990.png
D .https://assets.asklib.com/psource/2015110209563846737.png
-
长为L,质量为m
1
的均质杆OA的A端焊接一个半径为r,质量为m
2
的均质圆盘,该组合物体绕O轴转动的角速度w,则系统对O轴的动量矩H。()。
https://assets.asklib.com/psource/2016071916404917192.jpg
https://assets.asklib.com/psource/2016071916404899263.jpg
A . A
B . B
C . C
D . D
-
如图所示,长为l,质量m1的均质杆OA的A端上焊接一个半径为r、质量为m2的均质圆盘,该组合物体绕O点转动的角速度为,则对O点的动量矩为( )。/ananas/latex/p/309db4c46f679ff54c8a678b8234a3b6f16.jpg
-
图示系统由均质圆柱及均质杆OA铰接而成,其质量均为m。圆柱沿斜面做无滑动的滚动,并拖动杆OA向前移动。略去杆端A与斜面与之间的摩擦,系统初始静止。若s=v,则轮心O移动距离s时系统的动能为( ).4c775999842d4026bfedb8efcea541eb.jpg
-
质量为m,长为b的均质杆AB的一端A焊在圆盘边缘上,如图。圆盘以角速度w转动,质量为M,半径R,视为均质。则系统动量的大小p=____________,对轴C的动量矩的大小LC=___________。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/79144452cfc44f8e88da2728785a4e6d.png
-
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' />
-
质量为m1的匀质杆OA,一端铰接在质量为m2的匀质圆盘中心,另一端放在水平面上,圆盘在地面上做纯滚动。圆心速度为ν,则系统的动能为()。
<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
A.<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
B.<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
C.<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
D.<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
-
如图13-14a、13-14b所示2种支持情况的均质正方形板,边长均为a,质量均为m,初始时均处于静止状态。受某干扰后均沿顺时针方向倒下,不计摩擦,求当OA边处于水平位置时,2方板的角速度。
<img src='https://img2.soutiyun.com/ask/2021-03-04/983717405984707.png' /><img src='https://img2.soutiyun.com/ask/2021-03-04/983717421168575.png' />
-
如图所示OA杆位于铅直面内,OA杆为等截面均质杆,长为L,重为P,OA杆与水平夹角θ=60°,试用动静法求突然剪断AB绳瞬时,OA杆的角加速度ε<sub>OA</sub>。
<img src='https://img2.soutiyun.com/ask/uploadfile/5088001-5091000/4c91eea9992e3b451e1782563cfbeb8b.jpg' />
-
T形均质杆OABC以匀角速度ω绕O轴转动,如图示。已知OA杆质量为2m,长为2l,BC杆质量为m,长为 l,则T形杆在图示位置时动量的大小为()。
<img src='https://img2.soutiyun.com/ask/uploadfile/2295001-2298000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
A.<img src='https://img2.soutiyun.com/ask/uploadfile/2295001-2298000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
B.<img src='https://img2.soutiyun.com/ask/uploadfile/2295001-2298000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />
C.4mlω
D.3mlω
-
质量为m,长度为L的均质杆铰接于O点,A端固结一质量为m的质点如图示。当OA杆以角速度w绕O轴转动时,系统对轴O的动量矩的大小为()。
<img src='https://img2.soutiyun.com/shangxueba/ask/18612001-18615000/18613197/2016071916413125244.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18612001-18615000/18613197/2016071916413655485.jpg' />
A.A
B. B
C. C
D. D
-
质量为m1,半径为r的均质圆盘上,沿水平直径方向焊接一长为<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/2015110209540868947.png' />,质量为m2的均质杆AB。整个物体绕圆盘中心O以角速度w转动,该物体系统的总动量的大小为()。<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/2015110209544972304.png' />
A.(m1r+m2<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/2015110209540868947.png' />)w
B.<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/2015110209545823493.png' />
C.<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/2015110209550258813.png' />
D.<img src='https://img2.soutiyun.com/shangxueba/ask/19017001-19020000/19018430/201511020955055656.png' />
-
冲击摆如图6-15所示,由摆杆OA及摆锤组成,若将OA看成质量为m,长为l的均质细长杆;将B看成质量为m<sub>2</sub>,半径R的等厚均质量圆盘,求整个摆对转轴O的转动惯量。
<img src='https://img2.soutiyun.com/ask/2021-01-21/980073358567216.jpg' />
-
均质杆AD和BD长为1,质量分别为6m和4m,在D处铰接,如题9-18图(a)所示。开始时维持在铅垂面内静止,
均质杆AD和BD长为1,质量分别为6m和4m,在D处铰接,如题9-18图(a)所示。开始时维持在铅垂面内静止,设地面光滑,两杆被释放后将分开倒向地面。试求D点落地时偏移的水平距离。
<img src='https://img2.soutiyun.com/ask/2020-12-16/976993492108863.png' />
-
均质细杆OA可绕水平轴O转动,另一端铰接一均质圆盘,圆盘可绕铰A在铅直面内自由旋转,如图所示。已知杆OA长l,质量为m<sub>1</sub>;圆盘半径为R,质量为m<sub>2</sub>。摩擦不计,初始时杆OA水平,杆和圆盘静止。求杆与水平线成<img src='https://img2.soutiyun.com/ask/uploadfile/5091001-5094000/fb0d4fc0c11c1f457036c2b0ff24f55a.png' />角的瞬时,杆的角速度和角加速度。
<img src='https://img2.soutiyun.com/ask/uploadfile/5091001-5094000/759f6220cdcda7c5a0736531e47d4446.png' />
-
题11-30图(a)所示质量分别为m和2m,长度分别为I和2l的均质细杆OA和AB在A点光滑铰接,OA杆的O端为
题11-30图(a)所示质量分别为m和2m,长度分别为I和2l的均质细杆OA和AB在A点光滑铰接,OA杆的O端为光滑固定铰链。AB杆的B端放在光滑水平面上。初瞬时,OA杆水平,AB杆铅直。由于初位移的微小扰动,AB杆的B端无初速地向右滑动,试求当OA杆运动到铅垂位置时,A点处的约束力。
<img src='https://img2.soutiyun.com/ask/2020-12-17/977084883102405.png' />
-
长为l,质量为m的均质杆AB和BC用铰链B连接,并用铰链A固定,位于平衡位置,如题10-28图(a)所示。今
长为l,质量为m的均质杆AB和BC用铰链B连接,并用铰链A固定,位于平衡位置,如题10-28图(a)所示。今在C端作用一水平力F,试求此瞬时,两杆的角加速度。
<img src='https://img2.soutiyun.com/ask/2020-12-17/977075668776376.png' />
-
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。