一个可以视为质点的质量为m的小球,用长为l的不可伸长的细绳系在一个固定点,现将小球水平放置,并拉直细绳,然后自由落下,求经过时间t后细绳与水平方向的夹角a(0括号里错了,是夹角在0到9
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![一个可以视为质点的质量为m的小球,用长为l的不可伸长的细绳系在一个固定点,现将小球水平放置,并拉直细绳,然后自由落下,求经过时间t后细绳与水平方向的夹角a(0括号里错了,是夹角在0到9](/uploads/image/z/5903539-43-9.jpg?t=%E4%B8%80%E4%B8%AA%E5%8F%AF%E4%BB%A5%E8%A7%86%E4%B8%BA%E8%B4%A8%E7%82%B9%E7%9A%84%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B0%8F%E7%90%83%2C%E7%94%A8%E9%95%BF%E4%B8%BAl%E7%9A%84%E4%B8%8D%E5%8F%AF%E4%BC%B8%E9%95%BF%E7%9A%84%E7%BB%86%E7%BB%B3%E7%B3%BB%E5%9C%A8%E4%B8%80%E4%B8%AA%E5%9B%BA%E5%AE%9A%E7%82%B9%2C%E7%8E%B0%E5%B0%86%E5%B0%8F%E7%90%83%E6%B0%B4%E5%B9%B3%E6%94%BE%E7%BD%AE%2C%E5%B9%B6%E6%8B%89%E7%9B%B4%E7%BB%86%E7%BB%B3%2C%E7%84%B6%E5%90%8E%E8%87%AA%E7%94%B1%E8%90%BD%E4%B8%8B%2C%E6%B1%82%E7%BB%8F%E8%BF%87%E6%97%B6%E9%97%B4t%E5%90%8E%E7%BB%86%E7%BB%B3%E4%B8%8E%E6%B0%B4%E5%B9%B3%E6%96%B9%E5%90%91%E7%9A%84%E5%A4%B9%E8%A7%92a%280%E6%8B%AC%E5%8F%B7%E9%87%8C%E9%94%99%E4%BA%86%EF%BC%8C%E6%98%AF%E5%A4%B9%E8%A7%92%E5%9C%A80%E5%88%B09)
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