[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f7jAi_4_LoLl1x8nhCT5XFO5J98YIKDfTuT89U7pKUZ4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-10 22:22:58",4954154,[8,9,10,11],"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",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},15,"6922b011caae5b5198e0f13dc46e1c9f","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5e316e401bb3f04591268483204dcc21.jpg","大学物理B(2022-2023第二学期)","596e8d71400a4134be7a8fb94dafb138","刚体转动单元测验","关于刚体对轴的转动惯量,下列说法中正确的是[ ]",[21,32,35,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],4954153,[25,26,27,28],"JA>JB","JB>JA","JA=JB","JA、JB哪个大,不能确定","两个匀质圆盘A和B的密度分别为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5b50095edf141c98e8e27441a85b2d04.png\">和\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbccf126c78dd07030aff6911be9acd0b.png\">,若rA>rB,但两圆盘的质量与厚度相同,如两盘对通过盘心垂直于盘面轴的转动惯量各为JA和JB,则 [ ]","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],4954155,[39,40,41,42],"不变","变小","变大","如何变化无法判断","一轻绳绕在有水平轴的定滑轮上,滑轮的转动惯量为J,绳下端挂一物体.物体所受重力为P,滑轮的角加速度为a.若将物体去掉而以与P相等的力直接向下拉绳子,滑轮的角加速度a将[ ]",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],4954156,[48,49,50,51],"4.0 rad","8.0 rad","16.0 rad","24.0 rad","一作定轴转动的物体,对转轴的转动惯量J=3.0 kg·m2,角速度w0=6.0 rad\u002Fs.现对物体加一恒定的制动力矩M =-12 N·m,当物体的角速度减慢到w=2.0 rad\u002Fs时,物体已转过了角度△θ是[ ]",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],4954157,[57,58,59,60],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff7f25c240a9fa4102613f0ba6fe80aa.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F18c4d06febfcc44acdcdafd359e10d1b.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6b3d9832606afa866101701986784b97.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3084dce449ec90c040cd9e4fd4fb0406.png\">","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w0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 [ ]",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],4954158,[66,67,68,69],"2w 0","w 0","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F154cbb52818e2a519e4ece9c41171b4a.png\"> w 0","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F036ab92e6a4928ab49ae7240d106e374.png\">","如图所示,一水平刚性轻杆,质量不计,杆长l=20 cm,其上穿有两个小球.初始时,两小球相对杆中心O对称放置,与O的距离d=5 cm,二者之间用细线拉紧.现在让细杆绕通过中心O的竖直固定轴作匀角速的转动,转速为w 0,再烧断细线让两球向杆的两端滑动.不考虑转轴的和空气的摩擦,当两球都滑至杆端时,杆的角速度为 [ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc7a347f79a9070340609a552c532bd40.png\">",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],4954159,[75,76,77,78],"刚体不受外力矩的作用","刚体所受合外力矩为零","刚体所受的合外力和合外力矩均为零","刚体的转动惯量和角速度均保持不变","刚体角动量守恒的充分而必要的条件是 [ ]",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],4954160,[84,85,86,87],"动能","绕木板转轴的角动量","机械能","动量","一块方板,可以绕通过其一个水平边的光滑固定轴自由转动.最初板自由下垂.今有一小团粘土,垂直板面撞击方板,并粘在板上.对粘土和方板系统,如果忽略空气阻力,在碰撞中守恒的量是 [ ]",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],4954161,[93,94,95,96],"自转周期变小, 动能也变小","自转周期变小, 动能增大","自转周期变大, 动能增大","自转周期变大, 动能减小","银河系中一均匀球体天体, 其半径为R, 绕其对称轴自转的周期为T.由于引力凝聚作用, 其体积在不断收缩. 则一万年以后应有[ ]",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],4954162,[102,103,104,105],"只有机械能守恒","只有动量守恒","只有对转轴O的角动量守恒","机械能、动量和角动量均守恒","如图所示,一匀质细杆可绕通过上端与杆垂直的水平光滑固定轴O旋转,初始状态为静止悬挂.现有一个小球自左方水平打击细杆.设小球与细杆之间为非弹性碰撞,则在碰撞过程中对细杆与小球这一系统 [ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F69bad3a337ba8fc32e196a0baced91c4.png\">"]