1.物体质量为m=2kg,用两根轻绳AB、AC连接到竖直墙上,在物体上加一恒力F,若图中力F、轻绳AB与水平线夹角均为a=60度,要使两绳都能绷直,求恒力F的大小(g=10N)2.如图所示,物重30N,用OC绳悬挂在O点,O
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![1.物体质量为m=2kg,用两根轻绳AB、AC连接到竖直墙上,在物体上加一恒力F,若图中力F、轻绳AB与水平线夹角均为a=60度,要使两绳都能绷直,求恒力F的大小(g=10N)2.如图所示,物重30N,用OC绳悬挂在O点,O](/uploads/image/z/6984186-42-6.jpg?t=1.%E7%89%A9%E4%BD%93%E8%B4%A8%E9%87%8F%E4%B8%BAm%3D2kg%2C%E7%94%A8%E4%B8%A4%E6%A0%B9%E8%BD%BB%E7%BB%B3AB%E3%80%81AC%E8%BF%9E%E6%8E%A5%E5%88%B0%E7%AB%96%E7%9B%B4%E5%A2%99%E4%B8%8A%2C%E5%9C%A8%E7%89%A9%E4%BD%93%E4%B8%8A%E5%8A%A0%E4%B8%80%E6%81%92%E5%8A%9BF%2C%E8%8B%A5%E5%9B%BE%E4%B8%AD%E5%8A%9BF%E3%80%81%E8%BD%BB%E7%BB%B3AB%E4%B8%8E%E6%B0%B4%E5%B9%B3%E7%BA%BF%E5%A4%B9%E8%A7%92%E5%9D%87%E4%B8%BAa%3D60%E5%BA%A6%2C%E8%A6%81%E4%BD%BF%E4%B8%A4%E7%BB%B3%E9%83%BD%E8%83%BD%E7%BB%B7%E7%9B%B4%2C%E6%B1%82%E6%81%92%E5%8A%9BF%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%88g%3D10N%292.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%89%A9%E9%87%8D30N%2C%E7%94%A8OC%E7%BB%B3%E6%82%AC%E6%8C%82%E5%9C%A8O%E7%82%B9%2CO)
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