如图所示，两均质杆AC和BC各重P，长均为l，在C处以铰链连接，并置于光滑水平面上。C点的初始高度为h，两杆从静止开始在铅直面内落下，则铰链C到达地面C’时的速度vC为（）。https://assets.asklib.com/psource/2015103013440695338.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 . g B . 4/5g C . 3/4g D . 1/2g

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

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

A .https://assets.asklib.com/psource/2015103013500381797.jpg B .https://assets.asklib.com/psource/2015103013501944023.jpg C .https://assets.asklib.com/psource/2015103013503367764.jpg D .https://assets.asklib.com/psource/2015103013504670415.jpg

A . 整体→AC→CB→DF B . 整体→CB→AC→DF C . 整体→DF→AC→CB D . 整体→CB→DF→AC

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

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

<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' />

<img src='https://img2.soutiyun.com/ask/uploadfile/2109001-2112000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' /> A．νc=20cm/s B．νc=60cm/s C．νc=240cm/s D．νc=80cm/s

<img src='https://img2.51aidian.com/ask/2020-12-17/977086075083582.png' />

<img src='https://img2.soutiyun.com/ask/2021-03-04/983724738663112.png' /><img src='https://img2.soutiyun.com/ask/2021-03-04/983724766354696.png' />

<img src='https://img2.soutiyun.com/ask/uploadfile/5091001-5094000/3f6f197d5ebc4a28c97f34903443ec0a.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/5088001-5091000/4c91eea9992e3b451e1782563cfbeb8b.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

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' />

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' />

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' />