质量为m的小球P与穿过光滑平板中央光滑小孔O的轻绳相连,用力F拉使P做半径为r的匀速圆周运动,求【1】拉力F【2】半径为r时突然撤去拉力,一段时间t后拉紧,P做半径2r的匀速圆周运动,放开过程
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![质量为m的小球P与穿过光滑平板中央光滑小孔O的轻绳相连,用力F拉使P做半径为r的匀速圆周运动,求【1】拉力F【2】半径为r时突然撤去拉力,一段时间t后拉紧,P做半径2r的匀速圆周运动,放开过程](/uploads/image/z/3569933-29-3.jpg?t=%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B0%8F%E7%90%83P%E4%B8%8E%E7%A9%BF%E8%BF%87%E5%85%89%E6%BB%91%E5%B9%B3%E6%9D%BF%E4%B8%AD%E5%A4%AE%E5%85%89%E6%BB%91%E5%B0%8F%E5%AD%94O%E7%9A%84%E8%BD%BB%E7%BB%B3%E7%9B%B8%E8%BF%9E%2C%E7%94%A8%E5%8A%9BF%E6%8B%89%E4%BD%BFP%E5%81%9A%E5%8D%8A%E5%BE%84%E4%B8%BAr%E7%9A%84%E5%8C%80%E9%80%9F%E5%9C%86%E5%91%A8%E8%BF%90%E5%8A%A8%2C%E6%B1%82%E3%80%901%E3%80%91%E6%8B%89%E5%8A%9BF%E3%80%902%E3%80%91%E5%8D%8A%E5%BE%84%E4%B8%BAr%E6%97%B6%E7%AA%81%E7%84%B6%E6%92%A4%E5%8E%BB%E6%8B%89%E5%8A%9B%2C%E4%B8%80%E6%AE%B5%E6%97%B6%E9%97%B4t%E5%90%8E%E6%8B%89%E7%B4%A7%2CP%E5%81%9A%E5%8D%8A%E5%BE%842r%E7%9A%84%E5%8C%80%E9%80%9F%E5%9C%86%E5%91%A8%E8%BF%90%E5%8A%A8%2C%E6%94%BE%E5%BC%80%E8%BF%87%E7%A8%8B)
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