阿牛设计了如图的“风力仪”,轻质细杆长为a,下端固定一小球,上端可绕O点自由转动,小球质量为m,在水平风力作用下,小球偏离竖直方向30度时保持静止,此时风力大小为( ).若要提高风力
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![阿牛设计了如图的“风力仪”,轻质细杆长为a,下端固定一小球,上端可绕O点自由转动,小球质量为m,在水平风力作用下,小球偏离竖直方向30度时保持静止,此时风力大小为( ).若要提高风力](/uploads/image/z/3825674-26-4.jpg?t=%E9%98%BF%E7%89%9B%E8%AE%BE%E8%AE%A1%E4%BA%86%E5%A6%82%E5%9B%BE%E7%9A%84%E2%80%9C%E9%A3%8E%E5%8A%9B%E4%BB%AA%E2%80%9D%2C%E8%BD%BB%E8%B4%A8%E7%BB%86%E6%9D%86%E9%95%BF%E4%B8%BAa%2C%E4%B8%8B%E7%AB%AF%E5%9B%BA%E5%AE%9A%E4%B8%80%E5%B0%8F%E7%90%83%2C%E4%B8%8A%E7%AB%AF%E5%8F%AF%E7%BB%95O%E7%82%B9%E8%87%AA%E7%94%B1%E8%BD%AC%E5%8A%A8%2C%E5%B0%8F%E7%90%83%E8%B4%A8%E9%87%8F%E4%B8%BAm%2C%E5%9C%A8%E6%B0%B4%E5%B9%B3%E9%A3%8E%E5%8A%9B%E4%BD%9C%E7%94%A8%E4%B8%8B%2C%E5%B0%8F%E7%90%83%E5%81%8F%E7%A6%BB%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%9130%E5%BA%A6%E6%97%B6%E4%BF%9D%E6%8C%81%E9%9D%99%E6%AD%A2%2C%E6%AD%A4%E6%97%B6%E9%A3%8E%E5%8A%9B%E5%A4%A7%E5%B0%8F%E4%B8%BA%EF%BC%88++++%EF%BC%89.%E8%8B%A5%E8%A6%81%E6%8F%90%E9%AB%98%E9%A3%8E%E5%8A%9B)
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