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

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

A . A B . B C . C D . D

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

A . mRω，mRω，mlω，ml/2ω B . 0，mRω，ml/2ω，0 C . mRω，mRω，ml/2ω，0 D . 0，mRω，mlω，ml/2ω

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

A . A B . B C . C D . D

A . T=mr2ω2B . T=mr2ωhttps://assets.asklib.com/images/image2/2017032913402451594.jpg 2C . T=mr2https://assets.asklib.com/images/image2/2017032913403977808.jpg ω2D . T=mr2https://assets.asklib.com/images/image2/2017032913404767584.jpg ω2

<img src='https://img2.soutiyun.com/ask/uploadfile/5097001-5100000/e9c4ece384262297f6d018fb8ec33928.png' />

<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' />

平行四边形机构如图所示，O₁A=O₂B=r，O₁A∥O₂B，曲柄O₁A以等角速度ω转动。设各杆都是均质杆，质量均为m，则系统的动能T=______。 <img src='https://img2.soutiyun.com/ask/5097001-5100000/617786d342c8becb24569072c35508fa.jpg' />

<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

A．能使 AB 杆平衡的 θ 值不是唯一的，而是在某一个范围 B．只要 AB 杆我的重心在销子 C 的外侧，则任意小于 90 度的 θ 值都能使 AB 杆平衡 C．能使 AB 杆平衡的 θ 值是唯一的 D．任何 θ 值都不能使 AB 杆平衡

<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

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' />

A．0.5 B．1.0 C．1.5 D．2.0

图示均质板质量为m，放在两个均质圆柱滚子上，滚子质量皆为<img src='https://img2.soutiyun.com/latex/latex.action' />，其半径均为r。如在板上作用一水平力F，并设滚子无滑动，求板的加速度。 <img src='https://img2.soutiyun.com/ask/uploadfile/5091001-5094000/cb5b90dfc2ccf09dc3c97e22ce98ccb2.jpg' />

<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' />

题11-5图(a)所示系统由均质圆盘与均质细杆铰接而成。已知圆盘半径为r，质量为M，质量为m。在图示水平位置杆的角速度为w，角加速度为a，圆盘的角速度，角加速度均为零，试求系统惯性力系向定轴O简化的主矢与主矩。 <img src='https://img2.soutiyun.com/ask/2020-12-17/977077564929829.png' />

题11-27图(a)所示，AB，BC为长度相等，质量不等的两均质杆，已知从图示位置φ=30°，β= 60°无初速地开始运动时，BC杆中点M的加速度与铅垂线的夹角为θ=30°，试求两杆质量之比。 <img src='https://img2.soutiyun.com/ask/2020-12-17/977084472010892.png' />