质量不计的光滑木板AB长1.6m,可绕固定点O转动,离O点0.4cm的B端挂一重物G,板的A端用一根与水平面成30°夹角的细绳拉住,木板在水平位置平衡时拉力是8N,然后在O点的正上方放一质量为0.5kg的小球,
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![质量不计的光滑木板AB长1.6m,可绕固定点O转动,离O点0.4cm的B端挂一重物G,板的A端用一根与水平面成30°夹角的细绳拉住,木板在水平位置平衡时拉力是8N,然后在O点的正上方放一质量为0.5kg的小球,](/uploads/image/z/6969823-7-3.jpg?t=%E8%B4%A8%E9%87%8F%E4%B8%8D%E8%AE%A1%E7%9A%84%E5%85%89%E6%BB%91%E6%9C%A8%E6%9D%BFAB%E9%95%BF1.6m%2C%E5%8F%AF%E7%BB%95%E5%9B%BA%E5%AE%9A%E7%82%B9O%E8%BD%AC%E5%8A%A8%2C%E7%A6%BBO%E7%82%B90.4cm%E7%9A%84B%E7%AB%AF%E6%8C%82%E4%B8%80%E9%87%8D%E7%89%A9G%2C%E6%9D%BF%E7%9A%84A%E7%AB%AF%E7%94%A8%E4%B8%80%E6%A0%B9%E4%B8%8E%E6%B0%B4%E5%B9%B3%E9%9D%A2%E6%88%9030%C2%B0%E5%A4%B9%E8%A7%92%E7%9A%84%E7%BB%86%E7%BB%B3%E6%8B%89%E4%BD%8F%2C%E6%9C%A8%E6%9D%BF%E5%9C%A8%E6%B0%B4%E5%B9%B3%E4%BD%8D%E7%BD%AE%E5%B9%B3%E8%A1%A1%E6%97%B6%E6%8B%89%E5%8A%9B%E6%98%AF8N%2C%E7%84%B6%E5%90%8E%E5%9C%A8O%E7%82%B9%E7%9A%84%E6%AD%A3%E4%B8%8A%E6%96%B9%E6%94%BE%E4%B8%80%E8%B4%A8%E9%87%8F%E4%B8%BA0.5kg%E7%9A%84%E5%B0%8F%E7%90%83%2C)
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