[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$frP0JWnMdwfbeWHr2kMTlgFSiiAhvwtZr-9Kb0NuDE6o":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-09-08 17:12:04",96534554,[8,9,10,11],"ma","m(g+a)","m(g-a)","mg",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},110,"c7fc61d5f95bdc0f3666f699a6dfd3c9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8f6fcefc671ad71f0a4f77ab880538fa.jpg","大学物理（上）","a24df6e2d9be49679033f7fd93837ac6","《质点动力学》(章)过关测试","质量m的人站在以加速度a上升着的升降机中,人对升降机的压力为( )",[21,32,41,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],96534551,[25,26,27,28],"物体总是沿着它所受的合外力方向运动","物体的加速度方向总与它受的合外力方向相同","作用在物体上的合外力在某时刻为零,则物体在该时刻的速度必定为零","作用在物体上的合外力在某时刻为零,则物体在该时刻的加速度也可能不为零","下列说法中,哪个是正确的( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],96534552,[36,37,38,39],"A、B的加速度均为g","A、B的加速度均为零","A的加速度为零,B的加速度为2g","A的加速度为2g,B的加速度为零","如图,质量相同的物块A、B 用轻弹簧连接后,再用细绳悬吊着,当系统平衡后,突然将细绳剪断,则剪断后瞬间( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F87f528d1ef56bd18e607c24dc9ca8611.jpg\">",{"answer":42,"createTime":5,"id":6,"options":43,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":45,"createTime":46,"id":47,"options":48,"question":52,"source":30,"type":31},[],"2023-09-08 17:12:05",96534555,[49,50,51,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fab05713bcc553ce7f71643fee822ff89.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd74afb7b2ca79ceaaf8ff6f6fcd8ee92.jpg\">","0","飞船在离地球表面H的高空绕地球作匀速圆周运动,飞船上的宇航员对坐椅的压力为( ).(已知地球质量为M,人质量为m,地球半径为R)( )",{"answer":54,"createTime":46,"id":55,"options":56,"question":61,"source":30,"type":31},[],96534558,[57,58,59,60],"gsinθ","gcosθ","gtanθ","gcotθ","如图所示,质量为m的物体用用平行于斜面的细线连结并置于光滑的斜面上,若斜面向左方作加速运动,当物体刚脱离斜面时,它的加速度为( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9972237bb18ca9819f910779331bc73f.jpg\">",{"answer":63,"createTime":46,"id":64,"options":65,"question":70,"source":30,"type":31},[],96534561,[66,67,68,69],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7062a8ae2a19bcad835a6991c784d7c5.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F400201f75876c121594b0864a4a48a0c.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fde0c1d6647ea33df527333c7eea70069.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F529e80f2345cf87426ed80fc52991190.jpg\">","一质量为10 kg 的质点在力F 的作用下沿x 轴作直线运动,已知F =120t +40,式中F 的单位为N,t 的单位的s.在t =0 时,质点位于x =5.0 m处,其速度v0=6.0 m\u002Fs.则质点在任意时刻的速度和位置为( )",{"answer":72,"createTime":46,"id":73,"options":74,"question":79,"source":30,"type":31},[],96534562,[75,76,77,78],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F13af0729ccb7722e9fb07ef48e775978.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4a4c70ca4be6087039b27cde839933f3.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F27c74ded8c1a9875ff1ad8ed92317d99.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F447c751f7bf4710ee037abc666476e9d.jpg\">","一半径为R的半球形碗,内表面光滑,碗口向上固定于桌面上.一质量为m的小球正以角速度w 沿碗的内面在水平面上作匀速率圆周运动.则小球的运动水平面距离碗底的高度为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F28f35cbc3514a7d83499c1a2a6ec2dc1.png\">",{"answer":81,"createTime":46,"id":82,"options":83,"question":88,"source":30,"type":31},[],96534564,[84,85,86,87],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fea523da99b64154fda1f7fabcab1c491.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc6e8b653bf6c94d3cee8bf333e5d55ca.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbe686af72a1ff98cfefb45ddb423672b.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1c7ac58270f0ad3dcafef217f1ed90da.webp\">","已知一质量为m的质点在x轴上运动,质点只受到指向原点的引力的作用,引力大小与质点离原点的距离x的平方成反比,即\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc5c2696f9bcb84f7dc45596665140ad3.webp\">,k是比例常数.已知质点在 x = A时的速度为零,则质点在x = A \u002F 4处的速度大小为( )",{"answer":90,"createTime":46,"id":91,"options":92,"question":97,"source":30,"type":31},[],96534565,[93,94,95,96],"不为零,但保持不变","随FN成正比地增大","开始随FN增大,达到某一最大值后,就保持不变","无法确定","用水平力FN把一个物体压着靠在粗糙的竖直墙面上保持静止.当FN逐渐增大时,物体所受的静摩擦力Ff的大小( )",{"answer":99,"createTime":46,"id":100,"options":101,"question":106,"source":30,"type":31},[],96534567,[102,103,104,105],"不得小于\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F052739d3cf31652b533f126481175370.webp\">","必须等于\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F052739d3cf31652b533f126481175370.webp\">","不得大于\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F052739d3cf31652b533f126481175370.webp\">","还应由汽车的质量m决定","一段路面水平的公路,转弯处轨道半径为R,汽车轮胎与路面间的摩擦因数为μ.要使汽车不致于发生侧向打滑,汽车在该处的行驶速率( )"]