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04 11

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http://upload.u-state.com/viewer.php?id=8611721206378307.JPG clear explanation type in chinese... 唔該哂你地

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這題out of syllabus,要用moment of force(力距),知就行了: moment of force is the turing effect of the force It is 垂直支點的力乘以力與支點的距離 通常都會take the moment at one point Take moments aboutQ: (300)(0.5)=Tx0.75 T=200N (T 是P的讀數) Taking moment about point P: Total clockwise moment=total anti-clockwise moment (300)(0.25)=t(0.75)--where t是Q的讀數 t=100N so C is correct 2008-03-25 01:31:20 補充: 300是杆的重力 0.25 是移動了P後,杆的重心離P的距離 0.75 是P離Q的距離 2008-03-25 01:32:34 補充: 注:杆的重心位置必在杆的中點,即在杆的0.5m 位置 2008-03-25 01:44:11 補充: go to http://hk.geocities.com/viceleader982040/ceocamazing.jpg to see the force diagram 嘩!CE out seen 到去moment of force 架?

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