质量为m的长为L的三根相同的匀质细棒对称的搁在地面上,三棒的顶端O重合,低端A,B,C的间距均为L,如一正四面体.(1)求A棒顶端所受作用力F的大小?答案是mg×1/2√2.我用三力汇交去做,力三角形相
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![质量为m的长为L的三根相同的匀质细棒对称的搁在地面上,三棒的顶端O重合,低端A,B,C的间距均为L,如一正四面体.(1)求A棒顶端所受作用力F的大小?答案是mg×1/2√2.我用三力汇交去做,力三角形相](/uploads/image/z/1737286-70-6.jpg?t=%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E9%95%BF%E4%B8%BAL%E7%9A%84%E4%B8%89%E6%A0%B9%E7%9B%B8%E5%90%8C%E7%9A%84%E5%8C%80%E8%B4%A8%E7%BB%86%E6%A3%92%E5%AF%B9%E7%A7%B0%E7%9A%84%E6%90%81%E5%9C%A8%E5%9C%B0%E9%9D%A2%E4%B8%8A%2C%E4%B8%89%E6%A3%92%E7%9A%84%E9%A1%B6%E7%AB%AFO%E9%87%8D%E5%90%88%2C%E4%BD%8E%E7%AB%AFA%2CB%2CC%E7%9A%84%E9%97%B4%E8%B7%9D%E5%9D%87%E4%B8%BAL%2C%E5%A6%82%E4%B8%80%E6%AD%A3%E5%9B%9B%E9%9D%A2%E4%BD%93.%281%29%E6%B1%82A%E6%A3%92%E9%A1%B6%E7%AB%AF%E6%89%80%E5%8F%97%E4%BD%9C%E7%94%A8%E5%8A%9BF%E7%9A%84%E5%A4%A7%E5%B0%8F%3F%E7%AD%94%E6%A1%88%E6%98%AFmg%C3%971%2F2%E2%88%9A2.%E6%88%91%E7%94%A8%E4%B8%89%E5%8A%9B%E6%B1%87%E4%BA%A4%E5%8E%BB%E5%81%9A%2C%E5%8A%9B%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9B%B8)
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