[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fA2d_hAF9PbkzYYmIZAzw0KUF2krn5PXMUMM9FRckoS0":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-09-06 21:25:26",158924816,[8,9,10,11],"2.65kN","2.366kN","1.4kN","1.5kN",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},9,"f1bc2d1a8c0fafe1ab732bd4277ed65a","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F45dc70c2d26f0e7c56851cdace428145.png","理论力学（2022秋）","7f52c45b32db41f385c9194e9afd27d8","章节测试","物块B中P=2kN,物块A重Q=5kN,在B上作用 一水平力F,如图所示,当系A之绳与水平成θ=30°角,B与水平面间的静滑动摩擦系数fS1=0.2,物块A与B之间的静滑动摩擦系数fS2=0.25,要将物块B拉出时所需水平力F的最小值为________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F68df5812cc2c824c899943bdfa275571.png\">",[21,33,36,45,54,59,64,73,82],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-09-06 21:25:25",158924815,[26,27,28,29],"Fs=20N","Fs=10N","Fs=2N","Fs=-10N","为P=100N的物体置于水平面上,如图所示,其间的摩擦因数为fS=0.2,在水平力F=10N的作用下物体静止,则摩擦力的大小为________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5a1a56b1cf1b777582a10179c687a300.png\">","v1",0,{"answer":34,"createTime":5,"id":6,"options":35,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":37,"createTime":5,"id":38,"options":39,"question":44,"source":31,"type":32},[],158924817,[40,41,42,43],"α<arctan f,杆能平衡","α=arctan f,杆能平衡","只有当α<arctan f,杆不平衡","在0<α<90°< span="">时,杆都不平衡","图示木梯重为P,B端靠在铅垂墙上,A段放在水平地面上,若地面为绝对光滑,木梯与墙之间有摩擦,其摩擦系数为f,梯子与地面的夹角为α.以下四种条件的说法,哪一种是正确的.( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2091d1c4136e786a981eb1889ffee1df.jpg\">",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":31,"type":32},[],158924818,[49,50,51,52],"静止不动","向下滑动","运动与否取决于平衡条件","向上滑动","一重W的物体置于倾角为α的斜面上,若摩擦因数为f,且tanα<f,则物体________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe864c05c39968a31e0f079d5a5c0b2e9.jpg\">",{"answer":55,"createTime":5,"id":56,"options":57,"question":58,"source":31,"type":32},[],158924819,[49,50,51,52],"一重W的物体置于倾角为α的斜面上,若摩擦因数为f,且tan α<f,若增加物体重量,则物体________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F96da88ab587e1bfed674dbd19145239c.jpg\">",{"answer":60,"createTime":5,"id":61,"options":62,"question":63,"source":31,"type":32},[],158924820,[49,50,51,52],"一重W的物体置于倾角为α的斜面上,若摩擦因数为f,且tan α<f,若减轻物体重量,则物体________ \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F06452fde9b417d035bd21df8541dacaf.jpg\">",{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":31,"type":32},[],158924821,[68,69,70,71],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F830b2fbc87e8644fcec0ce27d6fcff04.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F59d0d56ca8cd94e50ee7d3f192764c06.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6fdf6dfada34fcaa73f224027b70cb63.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7d4913c86d32418fc71db96ecd9ba2b0.png\">","图示以后轮发动的汽车在粗糙地面上行驶时,其后轮受发动机的主力偶M的作用,前轮受轮轴上的水平推力P的作用,在下图所示的四种情况中(A、B为汽车的前后轮与地面之间有滚动摩阻的情况,C、D为汽车的前后轮与地面之间无滚动摩阻的情况),哪一个是正确的受力分析图.( )",{"answer":74,"createTime":5,"id":75,"options":76,"question":81,"source":31,"type":32},[],158924822,[77,78,79,80],"FS=fSP,Mf=Δp","FS=fSP,Mf=RF","FS=F, Mf=RF","FS= F,Mf=δP","重量为P、半径为R的圆轮,放在水平面上,如图所示,轮与地面间的滑动摩擦系数为fS,滚动摩阻系数为δ,圆轮在水平力F的作用下平衡,则接触处的摩擦力FS和滚动摩阻力偶矩Mf的大小分别为________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2a7fe15acad0a8c845c75326026247b4.png\">",{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":31,"type":32},[],158924823,[86,87,88,89],"静止于斜面","沿斜面又滚又滑","沿斜面作纯滑动","沿斜面作纯滚动","一重量为P的鼓轮,其外圆直径D=200mm,内圆直径d=180mm,放在倾角为θ=30°的斜面上,在内圆上绕一绳以大小等于5P的力F平行于斜面向上拉.已知斜面与鼓轮间的静滑动摩擦系数fs=0.5,滚动摩擦系数δ=0.25mm,则,此时鼓轮的运动状态为________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F434d75d81a6fb65940b267d194393b5a.png\">"]