[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fvEzS_mxzDHhmgvVdq4WBBJ1n-taGfIF7w2601CCi1Ak":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-11-06 09:27:46",164694916,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6081275b8264305f076755242433d607.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbe397add7bbaa7eec5a29f88fb7ccad2.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5b5f4eeabff267eb9a5b347b53367c39.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F879159603fe007306738af68f1c54a3f.webp\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},122,"c276bce3c601a9821dbbaaed933f8f10","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc4dbade751403f19ce5fe4056a50a610.jpg","大学物理（上）","896e006079b5490b8957b6bf8bcfe7bd","《动量和角动量及其守恒定理》(章)过关测试","质量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F12e5f1cfbac4258527a9423fb9ede306.webp\">的铁锤竖直落下,打在木桩上并停下.设打击时间\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0b29d016636bac146bcb7f89fd57e16e.webp\">,打击前铁锤速率为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6713a62651d44e61b0f7e0de23b70208.webp\">,则在打击木桩的时间内,铁锤受平均和外力的大小为( )",[21,32,41,50,59,62,71,80,90,99],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],164694912,[25,26,27,28],"子弹和木块组成的系统机械能守恒","子弹在水平方向动量守恒","子弹所受冲量与木块所受冲量大小相等","子弹减少的动能等于木块增加的动能","一粒子弹以水平速度射入静止于光滑水平面上的木块后,随木块一起运动,对于这个过程的,以下分析正确的是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],164694913,[36,37,38,39],"9.4 kg","10.1 kg","10.6 kg","14.1 kg","将一空盘放在电子秤上,将电子秤读数调整为零.然后在距盒底高度为 1.8 m 处,令小石子流自由下落,以100个\u002F秒的速率注入盒中,每个小石子的质量均为1×10-2kg,落下的高度差均相同,且落入盒内后立即停止运动,若取 g = 10 m\u002Fs2,则开始注入 10 s时,秤的读数应为( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],164694914,[45,46,47,48],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb3202993ebe76aa442ffaaed312988dc.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Faaf3ec0d97e102ea2d86dc343850c899.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8f5e8365d9c09804e250e3ae84a1e6ab.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffb0a13ab7de92caa9574a9d364315231.webp\">","质量为m 的质点以动能Ek 沿直线向左运动,质量为4m 的质点以动能4Ek 沿同一直线向右运动,这两个质点总动量的大小为( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],164694915,[54,55,56,57],"mv","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbc1624fdb8815580ac762a55630a6d0e.webp\">mv","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F26107966d311ad19581731fbc19d5ecd.webp\">mv","2 mv","质量为m的质点,以一恒定速率v沿图中正三角形ABC的光滑轨道运动,质点越过A时,轨道作用于质点冲量的大小为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8be0d3d9e2d8c3608c2cf8005da15977.png\">",{"answer":60,"createTime":5,"id":6,"options":61,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],164694917,[66,67,68,69],"速度大小为23.2m\u002Fs,速度方向为26.1°,其关系如图所示\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F481d979ba3de8bbfac4507011a3c95c8.jpg\">","速度大小为22.3m\u002Fs,速度方向为29.3°,其关系如图所示\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F481d979ba3de8bbfac4507011a3c95c8.jpg\">","速度大小为22.3m\u002Fs,速度方向为26.1°,其关系如图所示\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F481d979ba3de8bbfac4507011a3c95c8.jpg\">","速度大小为32.2m\u002Fs,速度方向为36.1°,其关系如图所示\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F481d979ba3de8bbfac4507011a3c95c8.jpg\">","质量m = 1.0kg的小球以初速率v0 = 20.0m\u002Fs沿水平方向抛出,则一秒钟之后小球速度的大小和方向分别为( )(不计空气阻力)",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],164694918,[75,76,77,78],"75N","100N","175N","225N","如图,质量m = 0.15kg的小球以v0 =10m\u002Fs速度射向光滑地面,入射角\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc30a45f849dc8a324248a3831feef69b.webp\">,然后沿\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffb92128a53b98210bf2905c891621367.webp\">的反射角方向弹出.设碰撞时间\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3dfe2b20634b4daa76e54b08ef14b0a6.webp\">,则小球对地面的平均冲力为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F26d147e73461e3e9cf98134ac3986970.jpg\">",{"answer":81,"createTime":82,"id":83,"options":84,"question":89,"source":30,"type":31},[],"2024-11-06 09:27:47",164694919,[85,86,87,88],"1:1","1:2","2:1","1:4","动量相等的甲乙两车,刹车后沿两条水平路面滑行,如果两车的质量比为1:2,路面对两车的阻力相同,则两车滑行时间之比为( )",{"answer":91,"createTime":82,"id":92,"options":93,"question":98,"source":30,"type":31},[],164694920,[94,95,96,97],"自身所受重力的2倍","自身所受重力的5倍","自身所受重力的8倍","自身所受重力的10倍","某消防队员从一平台上跳下,下落2m后双脚触地,接着他用双腿弯屈的方法缓冲,使自身重心又下降了0.5m.在着地过程中地面对他双脚的平均作用力估计为( )",{"answer":100,"createTime":82,"id":101,"options":102,"question":107,"source":30,"type":31},[],164694921,[103,104,105,106],"完全弹性碰撞","完全非弹性碰撞","非完全弹性碰撞","无法判断","两辆 A、B,可在光滑直轨道上运动,A车以3m\u002Fs的速率向右与静止的B车碰撞,A和B的质量分别为1kg和2kg,碰撞后A、B车的速度分别为-1m\u002Fs和2m\u002Fs,则碰撞的性质为( )"]