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範例:靜力平衡與樞紐力(二)[89日大]

一均勻細桿，長1公尺，重量為W，在距離其上端25公分處以一釘子將此細桿釘在鉛直牆面上，使細桿可繞此釘子無摩擦地旋轉，今施一水平力F於其上端，使細桿偏離鉛直線θ角(θ<90o)(如圖)，則在平衡時釘子作用在細桿上力之量值為(A)Wtanθ(B)W√(1+sin2θ)(C)Wsecθ(D)W/(1-sinθ) (E)Wcosθ。[89日大]

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Posted in 力矩與剛體靜力平衡, 歷屆物理考題.

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By admin – 2010 年 09 月 21 日

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