如图所示,用轻绳吊一个重为G的小球,欲施一力F使小球在图示位置平衡(θ
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![如图所示,用轻绳吊一个重为G的小球,欲施一力F使小球在图示位置平衡(θ](/uploads/image/z/10000759-31-9.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%A8%E8%BD%BB%E7%BB%B3%E5%90%8A%E4%B8%80%E4%B8%AA%E9%87%8D%E4%B8%BAG%E7%9A%84%E5%B0%8F%E7%90%83%2C%E6%AC%B2%E6%96%BD%E4%B8%80%E5%8A%9BF%E4%BD%BF%E5%B0%8F%E7%90%83%E5%9C%A8%E5%9B%BE%E7%A4%BA%E4%BD%8D%E7%BD%AE%E5%B9%B3%E8%A1%A1%28%CE%B8)
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