一道高中力学题--看不懂解答:为什么说 由F/mg=tanθ/2 ,可见在摆角为θ/2时小球的速度最大.质量为m的小球用长L的细线悬挂而静止在竖直位置.分别用水平拉力F将小球拉到细线与竖直方向成θ角
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![一道高中力学题--看不懂解答:为什么说 由F/mg=tanθ/2 ,可见在摆角为θ/2时小球的速度最大.质量为m的小球用长L的细线悬挂而静止在竖直位置.分别用水平拉力F将小球拉到细线与竖直方向成θ角](/uploads/image/z/9299507-59-7.jpg?t=%E4%B8%80%E9%81%93%E9%AB%98%E4%B8%AD%E5%8A%9B%E5%AD%A6%E9%A2%98--%E7%9C%8B%E4%B8%8D%E6%87%82%E8%A7%A3%E7%AD%94%EF%BC%9A%E4%B8%BA%E4%BB%80%E4%B9%88%E8%AF%B4+%E7%94%B1F%2Fmg%3Dtan%CE%B8%2F2+%2C%E5%8F%AF%E8%A7%81%E5%9C%A8%E6%91%86%E8%A7%92%E4%B8%BA%CE%B8%2F2%E6%97%B6%E5%B0%8F%E7%90%83%E7%9A%84%E9%80%9F%E5%BA%A6%E6%9C%80%E5%A4%A7.%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B0%8F%E7%90%83%E7%94%A8%E9%95%BFL%E7%9A%84%E7%BB%86%E7%BA%BF%E6%82%AC%E6%8C%82%E8%80%8C%E9%9D%99%E6%AD%A2%E5%9C%A8%E7%AB%96%E7%9B%B4%E4%BD%8D%E7%BD%AE.%E5%88%86%E5%88%AB%E7%94%A8%E6%B0%B4%E5%B9%B3%E6%8B%89%E5%8A%9BF%E5%B0%86%E5%B0%8F%E7%90%83%E6%8B%89%E5%88%B0%E7%BB%86%E7%BA%BF%E4%B8%8E%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91%E6%88%90%CE%B8%E8%A7%92)
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