[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f01FKkqZs8wJ_XWFFz8WMXp3DV-LcIMQ2RG_yKKOYUGU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-02 21:36:20",42889065,[8,9,10,11],"只有(1)是正确的","(1)、(2) 正确, (3)、(4)错误","(1)、(2)、(3)都正确, (4)错误","(1)、(2)、(3)、(4)都正确",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},13,"256feaf9005be01252a3aa6482242c28","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7e2d5ad53be3d12aacc56ee37db405b7.jpg","大学物理A","a1dc8f1fd23a40a5bf13e6c00dd2e310","第三章 《刚体力学基础》单元测试","有两个力作用在一个有固定轴的刚体上. ( )(1)这两个力都平行于轴作用时,它们对轴的合力矩一定是零;(2)这两个力都垂直于轴作用时,它们对轴的合力矩可能是零;(3)这两个力的合力为零时,它们对轴的合力矩也一定是零;(4)当这两个力对轴的合力矩为零时,它们的合力也一定是零.在上述说法中",[21,32,41,46,49,58,67,76,85,95],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],42889062,[25,26,27,28],"只取决于刚体的质量,与质量的空间分布和轴的位置无关","取决于刚体的质量和质量的空间分布,与轴的位置无关","只取决于转轴的位置,与刚体的质量和质量的空间分布无关","取决于刚体的质量,质量的空间分布和轴的位置","关于刚体对轴的转动惯量,下列说法中正确的是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],42889063,[36,37,38,39],"JA>JB","JA<JB","JA=JB","不能确定JA、JB哪个大","有两个半径相同,质量相等的细圆环A和B,A环的质量分布均匀, B环的质量分布不均匀,它们对通过环心并与环面垂直的轴的转动惯量分别为JA和JB, 则 ( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":45,"source":30,"type":31},[],42889064,[36,37,38,39],"两个质量分布均匀的圆盘A和B的密度分别为ρA和ρB (ρA>ρB),且两圆盘的总质量和厚度均相同.设两圆盘对通过盘心且垂直于盘面的轴的转动惯量分别为JA和JB,则有 ( )",{"answer":47,"createTime":5,"id":6,"options":48,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":30,"type":31},[],42889066,[53,54,55,56],"必然增大","必然减少","不会改变","如何变化,不能确定","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe0f66488dadac68d469b688481ba2431.png\"> 一圆盘饶过盘心且与盘面垂直的轴O以角速度w按图示方向转动,若如图所示的情况那样,将两个大小相等方向相反但不在同一条直线的力F沿盘面同时作用到圆盘上,则圆盘的角速度w ( )",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":30,"type":31},[],42889067,[62,63,64,65],"变大","变小","不变","无法判断","一轻绳绕在具有水平转轴的定滑轮上,绳下端挂一物体,物体的质量为m,此时滑轮的角加速度为β.若将物体卸掉,而用大小等于mg、方向向下的力拉绳子,则滑轮的角加速度将如何变化: ( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":30,"type":31},[],42889068,[71,72,73,74],"1\u002F3M","1\u002F6M","1\u002F9M","1\u002F81M","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F09b77a684ae6083111f728f12f9570c1.png\">一根长为L的均匀细棒可绕O点在竖直面内无摩擦转动.设棒在如图所示的水平位置时所受的重力矩为M,当棒从远端被截去\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F293f9d57b83047b61fd4725f3bc7b0f6.png\"> 长度后,剩余部分在水平位置所受的重力矩变为 ( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":30,"type":31},[],42889069,[80,81,82,83],"它的动量不变,对圆心的角动量也不变","它的动量不变,对圆心的角动量不断改变","它的动量不断改变,对圆心的角动量不变","它的动量不断改变,对圆心的角动量也不断改变","一质点作匀速率圆周运动时,下列说法正确的是 ( )",{"answer":86,"createTime":5,"id":87,"options":88,"question":94,"source":30,"type":31},[],42889070,[89,90,91,92,93],"动能不变,动量改变","动量不变,动能改变","角动量不变,动量不变","角动量改变,动量改变","角动量不变,动能、动量都改变","有一小块物体,置于光滑的水平桌面上,有一绳其一端连结此物体,另一端穿过桌面的小孔,该物体原以角速度w在距孔为R的圆周上转动,今将绳从小孔缓慢往下拉,则物体 ( )",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":30,"type":31},[],42889071,[99,100,101,102],"合外力与转轴相交","合外力平行于转轴","合外力为零","合外力矩为零","对于一个刚体来说,在下列条件中,哪种情况下系统的角动量不一定守恒? ( )"]