BT的物理题1,把一根质量分布均匀的铁棒一端放在桌面上,另一端用手支撑且距离桌面那端20cm,请问此时用手支撑住铁棒使其不落在桌面至少需要多少N的力?(倾斜45度,桌面是平整的,铁棒重200N,
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![BT的物理题1,把一根质量分布均匀的铁棒一端放在桌面上,另一端用手支撑且距离桌面那端20cm,请问此时用手支撑住铁棒使其不落在桌面至少需要多少N的力?(倾斜45度,桌面是平整的,铁棒重200N,](/uploads/image/z/15219183-39-3.jpg?t=BT%E7%9A%84%E7%89%A9%E7%90%86%E9%A2%981%2C%E6%8A%8A%E4%B8%80%E6%A0%B9%E8%B4%A8%E9%87%8F%E5%88%86%E5%B8%83%E5%9D%87%E5%8C%80%E7%9A%84%E9%93%81%E6%A3%92%E4%B8%80%E7%AB%AF%E6%94%BE%E5%9C%A8%E6%A1%8C%E9%9D%A2%E4%B8%8A%2C%E5%8F%A6%E4%B8%80%E7%AB%AF%E7%94%A8%E6%89%8B%E6%94%AF%E6%92%91%E4%B8%94%E8%B7%9D%E7%A6%BB%E6%A1%8C%E9%9D%A2%E9%82%A3%E7%AB%AF20cm%2C%E8%AF%B7%E9%97%AE%E6%AD%A4%E6%97%B6%E7%94%A8%E6%89%8B%E6%94%AF%E6%92%91%E4%BD%8F%E9%93%81%E6%A3%92%E4%BD%BF%E5%85%B6%E4%B8%8D%E8%90%BD%E5%9C%A8%E6%A1%8C%E9%9D%A2%E8%87%B3%E5%B0%91%E9%9C%80%E8%A6%81%E5%A4%9A%E5%B0%91N%E7%9A%84%E5%8A%9B%3F%EF%BC%88%E5%80%BE%E6%96%9C45%E5%BA%A6%2C%E6%A1%8C%E9%9D%A2%E6%98%AF%E5%B9%B3%E6%95%B4%E7%9A%84%2C%E9%93%81%E6%A3%92%E9%87%8D200N%2C)
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