


原帖由 Reeve. 於 2013-10-17 17:22 發表
同樣溫緊mid term的路過
1) F1 represents the force in each of the truss members
∑Fv = -100 + 2F1cos45 = 0
F1 = (100√2)/2
F1 = 70.7 N
2)差唔多
∑Fv = Fay + Fby - 50 = 0
tan50 = Fax / Fay ...



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