[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fMLfnSQm_SqyONFMeB3x9ZENwJeMRoLTPuOGpcXRci20":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-07 17:30:46",51384422,[8,9,10,11],"20cm\u002Fs","60cm\u002Fs","240cm\u002Fs","80cm\u002Fs",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},8,"ae6ce60254e84dd619c4f9392741ae8d","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48767fa5ce5cce276f80275b3bf695d2.jpg","理论力学","973fdea359f34b4b91b8f0f8267b2dba","第八章 测验","图示机构中,曲柄OB逆时针转动,与铅直线的夹角 φ=4t(t以秒计),曲柄OB带动杆AC,AC杆上点A和滑块在水平滑槽内运动.已知AB=OB=20cm;BC=40cm;,则当j= 90° 时,AC杆上C点速度大小vC为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F27708d798abd5cc5112ecfc2de2e66eb.png\">",[21,32,41,50,53,62,71,80],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],51384419,[25,26,27,28],"必相等","相差\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F29f98efae58a50b6af5dded11b43aa72.webp\">","相差\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fec8a0fa6fbadb71ce36c74ca3e123f84.webp\">","相差\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F966e9f1f89205212b4067529513bef65.webp\">","图示刚体作平面运动,某瞬时平面图形的角速度为ω,角加速度为α,则其上任意两点A、B的加速度在A、B连线上的投影( ). \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F58651b9512266012b716e254c2ad8817.png\">","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],51384420,[36,37,38,39],"w=0,a≠0","w≠0,a=0","w=0,a=0","w≠0,a≠0","某瞬时若平面图形上各点的加速度方向都指向同一点,则可知此瞬时平面图形的角速度ω和角加速度a为( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],51384421,[45,46,47,48],"w1=w2转向相同,vC1=vC2","w1<w2转向相同,vC1<vC2","w1>w2转向相反,vC1>vC2","w1<w2转向相反,vC1<vC2","两个几何尺寸相同、绕线方向不同的绕线轮,在绳的拉力下沿平直固定轨道做纯滚动,设绳端的速度都是v,在图示(a)、(b)两种情况下,轮的角速度及轮心的速度分别用w1、w2 、vC1、vC2 ,则w1与w2、vC1与vC2的相互关系分别是( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F655c2591999bbbe2d59dbce2f3e57c1b.png\">",{"answer":51,"createTime":5,"id":6,"options":52,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],51384423,[57,58,59,60],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1c24fc9fe89631fe42648ac7eb1adae7.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4e237615e333095886467a76e6237a2e.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff3b191c2b66a9ed21d1952e2fae4e1ac.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcc4a6a89b2c6c9bee61d98f80ca813aa.webp\">","图示平面机构在图示位置时,AB杆水平,BC杆铅直,滑块A沿水平面滑动的速度vA¹0、加速度aA=0.此时AB杆的角速度和角加速度分别用wAB和aAB表示,BC杆的角速度和角加速度分别用wBC和aBC表示,则( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa46bbf1f137cf25a483906765b53a1f4.png\">",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],51384424,[66,67,68,69],"O点","A点","B点","无穷远点","图示机构中作平面运动的构件在图示位置的速度瞬心是( ). \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F62c06d55dcb27d22b93074cebc9df74b.png\">",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],51384425,[75,76,77,78],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F943b5bc332ab36778c8ce49043908ad9.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0dc155528c96acaa1ea56fdd63ef4ab6.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5c7ff5f5be8647c6cb88d18a6e120239.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fdfc1ca696d440ce69ec5da7c7f1e7a46.webp\">","圆盘的半径为r,以匀角速度w在半径为R的圆槽内侧作纯滚动,如图所示,则轮心C的加速度大小为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F38bed0420af2456a2316323226700be0.png\">",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],51384426,[84,85,86,87],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2c1d7ccd3a5a4f044d3790e908c9746a.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03890f180350152961036239382019bf.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8c02b9663c59a95ee4002d756fd01687.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff9372727b3692fa28b738e427d293c0.webp\">","图示机构中,曲柄OA以匀角速度ω绕O轴转动,滚轮B沿水平面作纯滚动,已知OA=l,AB=2l ,滚轮半径为r.在图示位置时,OA铅直,滚轮B的角速度ωB为( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd84cadc4b841234f64cc7d004c0a9606.png\">"]