[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fm7qK-IbfDtFAvuFMXhAdLBPZtEgOHPVjOlRXj_-yoAk":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-04-06 10:02:26",181746195,[8,9,10,11],"沿水平方向","只可能沿斜面向上","只可能沿斜面向下","沿斜面向上或向下都有可能",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},15,"2ab68815d5dcc03f226d9a2f078ec372","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa04deddb533f5d8621cdcd38e66f7b74.jpg","大学物理","work_42454886","第三章作业","如图所示,一斜面固定在卡车上,一物块置于该斜面上.在卡车沿水平方向加速启动的过程中,物块在斜面上无相对滑动.此时斜面上摩擦力对物块的冲量的方向为( ) \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F430086f48d151a4510163cd578978eaa.jpg\">",[21,32,41,50,59,68,77,86,95,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],181746164,[25,26,27,28],"重力","摩擦力","万有引力","弹性力","下列力中不是保守力的是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],181746167,[36,37,38,39],"合外力为0","合外力不做功","外力和非保守内力都不做功","外力和保守内力都不做功","对于一个物理系统来说,下列哪种情况下系统的机械能守恒( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],181746171,[45,46,47,48],"动能","动量","功","功率","以下四个物理量中是矢量的是( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],181746175,[54,55,56,57],"保守力做正功时,系统内相应的势能增加","质点运动经一闭合路径,保守力对质点的冲量为零","质点运动经一闭合路径,保守力对质点做的功为零","根据作用力与反作用力的关系,相互作用的一对保守力所做功的代数和必为零","关于保守力,下面说法正确的是( )",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],181746179,[63,64,65,66],"质量","最初的动量","最初的速度","最初的动能","一运动物体受到恒定阻力的作用并最终停止,其所花费的时间取决于运动物体的( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],181746183,[72,73,74,75],"一个物体动量改变时,它的动能也一定改变","一个物体在运动过程中若其动能守恒,则其动量也守恒","两个质量不等的物体,动能相等时,质量大的动量值较大","多个质点组成的系统动量守恒时,如果一些质点的速率变大,则另一些质点的速率一定变小","下列说法正确的是( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],181746187,[81,82,83,84],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F13f3ac7a2bca1e36efc7367572545b30.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F35e70d3620e7bc119f25b55633d3bb55.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbf4b4661ee0765d1211de24301bc8b78.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc0cd49a6f187831608121fb76450b009.png\">","有一劲度系数为k的轻弹簧,原长为l0,将它吊在天花板上.当它下端挂一托盘平衡时,其长度变为l1.然后在托盘中放一重物,弹簧长度变为l2,则由l1伸长至l2的过程中,弹性力所作的功为( ) \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F759c91b81c08a04dd9cee07e0f1aebca.png\">",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":30,"type":31},[],181746191,[90,91,92,93],"减小运动员的动量变化","减小运动员所受到的冲量","减小着地过程的作用时间","减小着地时运动员所受的平均冲力","跳高运动员在跳高时总是落到海绵上,这样做是为了( )",{"answer":96,"createTime":5,"id":6,"options":97,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],181746199,[102,103,104,105],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6a7b2649a6e4a0a493765b6c4cadfb03.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0033ae2307d1e81f8ab3a01b162da428.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe71e253a55a6a0bd52eddbc7a00cde0b.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff0796eecb2e5130ea38a18a4cafd22db.png\">","速度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3512bf1ca75845dbbf80dc19b821bde4.png\">的子弹,打穿一块不动的木板后速度变为零,设木板对子弹的阻力是恒定的.那么,,当子弹射入木板的深度等于其厚度的一半时,子弹的速度是( )"]