• 2021-04-14
    均质杆 OA 长 L ,质量为 m ,则撞击中心 K 到轴 O 的距离为 ___ ______ 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/31f2048ca729431e87e849cd8d7d12a7.png
  • http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/91f5046c55a64c6781c1da2c7b008729.png

    举一反三

    内容

    • 0

      均质杆AB质量为m,两端用张紧的绳子系住,绕O轴转动,如图所示,则杆AB对O轴的动量矩_______。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/e6b5bd619c574ee293e13ff8824f0a1e.png

    • 1

      杆OA长L,以w0绕O轴转动,长R的叶片AB以相对角速度wr绕OA直杆的A端转动,若以OA杆为动坐标系,则当AB22a5AO时,B点的牵连速度的大小为_____________。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/69c1d5641e1a45149de8da65d0c79e34.png

    • 2

      有一半径为R的水平圆转台,可绕通过其中心的竖直固定光滑轴转动,转动惯量为J,开始时转台以匀角速度<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/ed67d7f8595f462fbc1cdec84d274f10.png" />转动,此时有一质量为m的人站在转台中心。随后人沿半径向外跑去,当人到达转台边缘时,转台的角速度为( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/f49b5cb39a54454d8fc78ba116473b25.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/83dfbb789f98426db5035f2c8f6db5e9.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/564d67c3c5b845259a99c3b436e962f3.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/3d173073724f4699ad244feb5d27e668.png" />

    • 3

      拉普拉斯(Laplace)方程的表达式为( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/26731bcad75f41389448b29292940653.jpg" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/40e7e55a72ee44f59b45d20c84ebe3a6.jpg" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/c65a79ea4d754174b99f34020d6e1735.jpg" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/139e8d3dc37941549e7b6b1731243172.jpg" />

    • 4

      平面一维稳定渗流的压力分布公式为( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/d08348f3b84f442d87994311dc13686b.jpg" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/2df214c86c5e4103897ba81ce2c6cd98.jpg" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/cc98e4a778cc463c965ac8115e028f86.jpg" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/bc82177c19d44acfa1b365c3d66ed0a4.jpg" />