[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGAcVxEzVqXdygSOLYpi4CY-WlmQhf-UrQqoI9yGB4PI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2025-06-15 20:38:46",201236118,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff2c900444500fb132fe123be9aceaf69.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcfb81763a379bd3a0501b45c2c7c5e17.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe0636f75fdef0a257dcc293b16a2d62e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7455c693deb66d00bf476cfbfaaf31cb.png\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},18,"ea3f10b90e568dd2f02e5e05c98e5301","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48eba3395437dd881b1b9275a0ad1028.png","大学物理[2-1]","work_42881834","第三章 刚体力学基础","一人造地球卫星到地球中心O的最大距离和最小距离分别是RA和RB.设卫星对应的角动量分别是LA、LB,动能分别是EKA、EKB,则应有( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4133170c15650f516e9190914a25fe75.png\">",[21,33,42,51,60,69,78,87,96,105],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-06-15 20:38:45",201236108,[26,27,28,29],"内力矩会改变刚体对某个定轴的角动量(动量矩)","作用力和反作用力对同一轴的力矩之和必为零","角速度的方向一定与外力矩的方向相同","质量相等,形状和大小不同的两个刚体,在相同力矩的作用下,它们的角加速度一定相同","关于力矩有以下几种说法,其中正确的是( )","v1",0,{"answer":34,"createTime":23,"id":35,"options":36,"question":41,"source":31,"type":32},[],201236110,[37,38,39,40],"只有(1)是正确的","(1) (2)正确,(3) (4) 错误","(2) (3) 都正确,(4)错误","(1) (2) (3) (4)都正确","有两个力作用在一个有固定转轴的刚体上:(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) 当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( )",{"answer":43,"createTime":5,"id":44,"options":45,"question":50,"source":31,"type":32},[],201236111,[46,47,48,49],"合外力为零,合外力矩一定为零","合外力为零,合外力矩一定不为零","合外力为零,合外力矩可以不为零","合外力不为零,合外力矩一定不为零","以下说法正确的是( )",{"answer":52,"createTime":5,"id":53,"options":54,"question":59,"source":31,"type":32},[],201236112,[55,56,57,58],"只有②是正确的","①②是正确的","②③是正确的","①②③都是正确的","关于力矩有以下几种说法:①对某个定轴而言,内力矩不会改变刚体的角动量.②作用力和反作用力对同一轴的力矩之和必为零.③质量相等,形状和大小不同的两个刚体,在相同力矩的作用下,它们的角加速度一定相等.在上述说法中( )",{"answer":61,"createTime":5,"id":62,"options":63,"question":68,"source":31,"type":32},[],201236113,[64,65,66,67],"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","取决于刚体的质量、质量的空间分布和轴的位置","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","关于刚体对轴的转动惯量,下列说法中正确的是( )",{"answer":70,"createTime":5,"id":71,"options":72,"question":77,"source":31,"type":32},[],201236114,[73,74,75,76],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F495edb9830b69a307176800385875181.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbd6054b35862dd6ce1d3ca4b2cf183b6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6d52dc6adab28d2e1d7f1703a569e83a.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0e42f21a014b1ee292e9b58a50fd1641.png\">","芭蕾舞演员开始自转时的角速度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8f970841426bd354d0f475a111db2863.png\">,转动惯量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb5eae202379fe0ec2574e2b8b898c9ca.png\">,当他将手臂收回时,其转动惯动量减少为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F892480de2d28786b9858c31ac44a125b.png\">,则角速度将变为( )",{"answer":79,"createTime":5,"id":80,"options":81,"question":86,"source":31,"type":32},[],201236115,[82,83,84,85],"卫星的动量守恒,角动量守恒","卫星的动量守恒,角动量不守恒","卫星的动量不守恒,角动量守恒","卫星的动量不守恒,角动量不守恒","人造地球卫星作椭圆轨道运动,则( )",{"answer":88,"createTime":5,"id":89,"options":90,"question":95,"source":31,"type":32},[],201236116,[91,92,93,94],"动量不守恒,动能守恒","动量守恒,动能不守恒","对地心的角动量守恒,动能不守恒","对地心的角动量不守恒,动能守恒","人造地球卫星,绕地球作椭圆轨道运动,地球在椭圆的一个焦点上,则卫星的( )",{"answer":97,"createTime":5,"id":98,"options":99,"question":104,"source":31,"type":32},[],201236117,[100,101,102,103],"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( )",{"answer":106,"createTime":5,"id":6,"options":107,"question":19,"source":31,"type":32},[],[8,9,10,11]]