一个底面粗糙,质量为m的劈放在粗糙水平面上,劈的斜面光滑且与水平面的夹角为30°,现用一端固定的轻绳系一质量也为m 的小球小球与斜面的夹角为30 °.①当劈静止时绳子中的拉力大小为多少
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![一个底面粗糙,质量为m的劈放在粗糙水平面上,劈的斜面光滑且与水平面的夹角为30°,现用一端固定的轻绳系一质量也为m 的小球小球与斜面的夹角为30 °.①当劈静止时绳子中的拉力大小为多少](/uploads/image/z/3240105-33-5.jpg?t=%E4%B8%80%E4%B8%AA%E5%BA%95%E9%9D%A2%E7%B2%97%E7%B3%99%2C%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%8A%88%E6%94%BE%E5%9C%A8%E7%B2%97%E7%B3%99%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%2C%E5%8A%88%E7%9A%84%E6%96%9C%E9%9D%A2%E5%85%89%E6%BB%91%E4%B8%94%E4%B8%8E%E6%B0%B4%E5%B9%B3%E9%9D%A2%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA30%C2%B0%2C%E7%8E%B0%E7%94%A8%E4%B8%80%E7%AB%AF%E5%9B%BA%E5%AE%9A%E7%9A%84%E8%BD%BB%E7%BB%B3%E7%B3%BB%E4%B8%80%E8%B4%A8%E9%87%8F%E4%B9%9F%E4%B8%BAm+%E7%9A%84%E5%B0%8F%E7%90%83%E5%B0%8F%E7%90%83%E4%B8%8E%E6%96%9C%E9%9D%A2%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA30+%C2%B0.%E2%91%A0%E5%BD%93%E5%8A%88%E9%9D%99%E6%AD%A2%E6%97%B6%E7%BB%B3%E5%AD%90%E4%B8%AD%E7%9A%84%E6%8B%89%E5%8A%9B%E5%A4%A7%E5%B0%8F%E4%B8%BA%E5%A4%9A%E5%B0%91)
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