[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fzL8qqmAOsD01D2TLOlR_8N-YmECO5dckq2o3Wwuaym8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-05-12 10:36:41",187253858,[8,9,10,11],"合外力为0","合外力不作功","外力和非保守内力都不作功","外力和保守内力都不作功",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},15,"0e8dfad2bc2cb3ed90603742156a4b30","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe7b1e6905a34e261fc93da0a49aa3161.png","大学物理A1","work_42343004","功 动能定理 功能关系 机械能守恒","对于一个物体系来说,在下列条件中,哪种情况下系统的机械能守恒?( )",[21,32,41,50,59,68,71,77,82,88],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],187253853,[25,26,27,28],"在两种情况下,\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0defb3e47b56748ef8500b38f0e95cbd.png\">做的功相等","在两种情况下,摩擦力对箱子做的功相等","在两种情况下,箱子获得的动能相等","在两种情况下,因摩擦而产生的热相等","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe16c33d211d5e5b96e0defdbc187f770.png\">在光滑水平地面上放置一辆小车,小车左端放置一只箱子,小车与箱子间的接触面粗糙,今用同样的水平恒力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0defb3e47b56748ef8500b38f0e95cbd.png\">拉箱子,使它由小车的左端到达右端,一次小车被固定在水平地面上,另一次小车没有固定.以地面为参照系,下列说法正确的是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],187253854,[36,37,38,39],"25m\u002Fs","20m\u002Fs","10m\u002Fs","7.07m\u002Fs","一质量为4kg的物体,在光滑的水平面受到水平变力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff40054173666c254aec2bbbbf2a3e8af.png\">(式中各物理量单位均为SI制)作用,以初速v0=5m\u002Fs从原点出发,物体运动到x=10m时的速度为( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],187253855,[45,46,47,48],"(1)(2)","(2)(3)","只有(2)","只有(3)","功的概念有以下几种说法 (1)保守力作功时,系统内相应的势能增加 (2)质点运动经一闭合路径,保守力对质点作的功为零 (3)作用力和反作用力大小相等,方向相反,所以两者作功的代数和必为零 以上论述中,哪些是正确的( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],187253856,[54,55,56,57],"动量守恒,动能守恒","动量不守恒,机械能守恒","动量不守恒,动能守恒","动量守恒,机械能守恒","在水平光滑的桌面上横放着一个圆筒,筒底固定着一个轻质弹簧.今有一小球沿水平方向正对弹簧射入筒内(如图所示),尔后又被弹出.圆筒(包括弹簧)、小球系统在这一整个过程中 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3ea6ee7db4535b9c70588b9837f3ed1c.png\">",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],187253857,[63,64,65,66],"推力不做功","推力与摩擦力做功之和为零","推力与重力做功之和为零","该重物所受力做功之和为零","将一重物匀速推上一个斜坡,下列说法正确的是( )",{"answer":69,"createTime":5,"id":6,"options":70,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":72,"createTime":5,"id":73,"options":74,"question":75,"source":30,"type":76},[],187253859,[],"一个力F作用在质量为 1.0 kg的质点上,使之沿x轴运动.已知在此力作用下质点的运动学方程为x=3t-4t2+t3 (SI).在0到4 s的时间间隔内力F对质点所作的功 ____J,动能的增量为______J",2,{"answer":78,"createTime":5,"id":79,"options":80,"question":81,"source":30,"type":76},[],187253861,[],"一个质点在力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc14e85fe750a4cf775b4aca47c5de95a.png\">作用下产生的位移\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffc6c6c724f1893ec54be2926fcb7f85b.png\">,则这个力所作的功为____J",{"answer":83,"createTime":84,"id":85,"options":86,"question":87,"source":30,"type":76},[],"2025-05-12 10:36:42",187253863,[],"一质点在二恒力的作用下发生位移为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9866eaea46f5508e9141a85482fe641c.png\">,动能增量为24J,已知其中一恒力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fda91da3dea35db32a95968c069bfd775.png\">,则另一恒力做功为( )J",{"answer":89,"createTime":84,"id":90,"options":91,"question":92,"source":30,"type":76},[],187253865,[],"一质点受力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5a8f608accfbbca43a7a52577494e2f4.png\">作用,沿X轴正方向运动.从x=0到x=2m过程中,力\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6a10f51f1d450d615e4d514d1e255c5e.png\">作功为 J.(填整数)"]