如图4-57所示质量为m、长为ι的杆OA以ω的角速度绕轴O转动，则其动量为（）。https://assets.asklib.com/psource/2015103014384250680.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 . mlω B . 0 C . （1／2）mlω D . （1／3）mlω

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/201510301504278200.jpg B .https://assets.asklib.com/psource/2015103015044437078.jpg C . mι2ωD .https://assets.asklib.com/psource/2015103015045744987.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/2015103014561238313.jpg B .https://assets.asklib.com/psource/2015103014562263140.jpg C .https://assets.asklib.com/psource/2015103014571540914.jpg D .https://assets.asklib.com/psource/2015103014572647006.jpg

A . ['mνB . 2mνC .https://assets.asklib.com/psource/201510301443098930.jpg D .https://assets.asklib.com/psource/2015103014431950221.jpg

A . （1／12）ml ω B . （7／24）ml ω C . （7／48）ml ω D . （7／96）ml ω

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

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/2015103014453027274.jpg B .https://assets.asklib.com/psource/2015103014454462918.jpg C .https://assets.asklib.com/psource/2015103014455682834.jpg D .https://assets.asklib.com/psource/201510301446079563.jpg

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

<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' />

如图所示，一均匀细杆长为，质量为m，平放在摩擦系数为u的水平桌面上，设开始时杆以角速度<img src='https://img2.soutiyun.com/ask/2021-02-08/981629300873302.png' />绕过中心o且垂直与桌面的轴转动，试求：(1)作用于杆的摩擦力矩;(2)经过多长时间杆才会停止转动。 <img src='https://img2.soutiyun.com/ask/2021-02-08/981629320354417.png' />

<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

<img src='https://img2.soutiyun.com/ask/2020-02-13/950461415728433.png' />

A．<img src='https://img2.soutiyun.com/shangxueba/ask/1989001-1992000/1990848/ct_jgzjgysm_jgzjgyschoose_00179(20093)2.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/1989001-1992000/1990848/ct_jgzjgysm_jgzjgyschoose_00179(20093)3.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/1989001-1992000/1990848/ct_jgzjgysm_jgzjgyschoose_00179(20093)4.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/1989001-1992000/1990848/ct_jgzjgysm_jgzjgyschoose_00179(20093)5.jpg' />

均质细直杆OA长为，，质量为m，A端固结一质量为m的小球(不计尺寸)，如图4-76所示。当OA杆以匀角速度ω绕O轴转动时，该系统对O轴的动量矩为()。 A.1/3ml2ω B.2/3ml2ω C.ml2ω D.4/3ml2ω

<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

<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' />

<img src='https://img2.soutiyun.com/ask/2021-01-21/980073358567216.jpg' />

A．0.5 B．1.0 C．1.5 D．2.0