[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fAg8Cax1alY3P1Is7otY_gzoxhXJtkAfXyLlL0TKBNOg":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-10 17:16:13",258713729,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe370426fe136b0369a1aa0aaed0fdd7a.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3ab5413ceba7cf2cbcdbe819439973e3.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F64b1707d1c8b6afa10147838bfbb4971.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fca6309c10a02619a4486d7d0572b8ccf.png\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},58,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_48482567","14-1、2、3狭义相对论的基本原理及其时空观","边长为a的正方形薄板静止于惯性系S的Oxy平面内,且两边分别与Ox、Oy轴平行.今有惯性系S¢以0.8c的速度相对于S系沿Ox轴作匀速直线运动,则从S¢系测得薄板的面积为()",[21,32,41,50,59,68,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],258713720,[25,26,27,28],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa963a1557e270a2dc42a05a2e986f2c8.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F11d303212049709cbc5666e2787623ad.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F26936e5d43eabacb72ae1ffebb845cbc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3c7650c2ed0ae666a6fa83e7c08ad840.png\">","一粒子在惯性系S中沿y轴正方向以光速c运动,当S系中的观测者以速率v沿x轴正方向运动时,观测者测得粒子的速度为()","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],258713722,[36,37,38,39],"A、B可能既不同时又不同地发生","A、B可能不同时但同地发生","A、B可能同时而不同地发生","A、B仍是同时又同地发生","在惯性系S中同时又同地发生的事件A、B,在其他运动着的惯性系中测量()",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],258713723,[45,46,47,48],"在一惯性系同时发生的两个事件,在另一惯性系一定不同时发生","在一惯性系不同地点同时发生的两个事件,在另一惯性系一定同时发生","在一惯性系同一地点同时发生的两个事件,在另一惯性系一定同时发生","在一惯性系不同地点不同时发生的两个事件,在另一惯性系一定不同时发生","关于同时性有人提出以下一些结论,其中()是正确的",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],258713725,[54,55,56,57],"Dt¢<Dt,l0<l","Dt¢<Dt,l0>l","Dt¢>Dt,l0>l","Dt¢>Dt,l0<l","两个惯性系S和S',它们的对应坐标轴相互平行,且S'系相对于S系以速度u沿着Ox轴运动.设在S'系中某点先后发生了两个事件,用固定于该系的钟测出两事件的时间间隔为Δt',而用固定于S系的钟测出这两个事件的时间间隔为Δt.又在S'系O'x'轴上放置一固有长度为l0的细杆,从S系测得此杆的长度为l,则",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],258713728,[63,64,65,66],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F107e53044d2e4d3df7f16e5fcc0214a2.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffed6e2203999e184b604df975b26f0ce.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe17454a411d0bbd0dba422144d503597.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbdd2d9024054c3a36e38e27953525681.png\">","匀质细棒静止时的质量为m0,长度为l0,当它沿棒长方向作高速的匀速直线运动时,测得它的长为l,则该棒的运动速度大小为()",{"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":79,"source":30,"type":31},[],258713732,[75,76,77,78],"两杆左右端点同时对齐","左端先对齐,然后右端对齐","右端先对齐,然后左端对齐","两杆左右端点永远无法对齐","如图所示,两根固有长度为l0的细杆正平行于x轴方向作相向匀速运动,观察者A、B分别固定在两杆上.当两杆相互接近时,观察者A首先发现两杆左端对齐(即两杆端点在x轴上坐标相同),然后是右端对齐.观察者B认为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F882358a329f11a449cd9464f39491541.png\">",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],258713735,[84,85,86,87],"大于45°","小于45°","等于45°","当S¢系沿Ox正方向运动时大于45°,而当S¢系沿Ox负方向运动时小于45°","有一直尺固定在S¢系中,它与Ox¢轴的夹角q ¢=45°,如果S¢系以速率u沿Ox方向相对于S系运动,S系中观察者测得该尺与Ox轴的夹角( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],258713737,[93,94,95,96],"10s","8s","6s","3.6s","在某地发生两件事,静止位于该地的甲测得时间间隔为6s,若相对甲以4c\u002F5(c表示真空中光速)的速率作匀速直线运动的乙测得时间间隔为",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],258713738,[102,103,104,105],"(1)一定同时, (2)一定不同时","(1)一定不同时, (2)一定同时","(1)一定同时, (2)一定同时","(1)一定不同时, (2)一定不同时","(1) 对某观察者来说,发生在某惯性系中同一地点,同一时刻的两个事件,对于相对该惯性系作匀速直线运动的其它惯性系的观察者来说,它们是否同时发生?(2) 在某惯性系中发生于同一时刻,不同地点的两个事件,它们在其它惯性系中是否同时发生? 关于上述两问题的正确答案是"]