[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fDw5Gqc_XAqrDRmhUYHpGBCDFsemvdZFAMBlGEU6P9us":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":15,"related":16,"source":22,"type":23},[],"2023-06-13 08:23:47",61528219,[],{"count":9,"courseId":10,"courseImg":11,"courseName":12,"workId":13,"workName":14},5,"1ea5242b1f70afc6a366dedbeff2226b","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F59380464f896f26d3f98fc28171557df.png","大学物理","work_26246959","动力学作业2","如图,一个质量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7fb6696383c1e74a2f6de6d116da87a1.webp\">的物体拴在长为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd7ba654bbb5b66192db0d9e88e2ceea3.webp\">的轻绳上,绳的另一端固定在一个水平光滑桌面的钉子上.另一质量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3e6cda41f323375f2f46fd0671e0a326.webp\">的物体,用长为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F53042bc06e78e312f8846bbb495e8fda.webp\">的绳与\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa3f8656ab34e4a86ceec6f328611d85e.webp\">连接.二者均在桌面上匀速圆周运动,假设角速度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8c2889799e2288af0690e674934b2255.webp\">,求各段绳子上的张力.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F32fcdbcf6ab660eddf5502578c24e59f.png\">",[17,24,27,32,37],{"answer":18,"createTime":5,"id":19,"options":20,"question":21,"source":22,"type":23},[],61528218,[],"一颗子弹在枪筒里前进时所受的合力大小为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F673d18e0b0be0fc953101939e16a2491.png\">( t以s为单位F以N为单位),子弹出枪口时的速率为300m\u002Fs,假设子弹离开枪口时合力刚好为零,求(1)子弹在枪筒中的时间;(2)子弹在枪筒中受到的冲量;(3)子弹的质量","v1",7,{"answer":25,"createTime":5,"id":6,"options":26,"question":15,"source":22,"type":23},[],[],{"answer":28,"createTime":5,"id":29,"options":30,"question":31,"source":22,"type":23},[],61528220,[],"质一量为10 kg的质点在力F= 120t+40(F以N为单位,t以s为单位)作用下,沿x轴作直线运动.在t= 0时,质点位于x = 5.0m处,其速度大小\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1d8161e07530bc7e7f33ad8a3a8e2654.webp\">=6.0m﹒s-1.求质点在任意时刻的速度和位置",{"answer":33,"createTime":5,"id":34,"options":35,"question":36,"source":22,"type":23},[],61528221,[],"质量为 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7fb6696383c1e74a2f6de6d116da87a1.webp\"> 的人造地球卫星沿一圆形轨道运动,离开地面的高度等于地球半径的二倍(即2R).试以 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa3f8656ab34e4a86ceec6f328611d85e.webp\">,R,引力常量G,地球质量 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3e6cda41f323375f2f46fd0671e0a326.webp\"> 表示出:(1) 卫星的动能; (2) 卫星在地球引力场中的引力势能;(3) 卫星的总机械能",{"answer":38,"createTime":5,"id":39,"options":40,"question":41,"source":22,"type":23},[],61528222,[],"质量为10Kg的物体沿x轴无摩擦地运动,t=0的时刻,其静止在坐标原点,求下列情况下物体的速度 (1)在力F=3+4x 作用下运动了3m; (2)在力F=3+4t 作用下移动了3s.(SI)"]