AB是长直杆,A处有一个滑轮,AC是墙面,BC是一根水平绳子 .AC=4,BC=6.求滑轮在A处对杆的弹力F. 答案是5/4mg.为什么弹力方向由A指向BC中点呢
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![AB是长直杆,A处有一个滑轮,AC是墙面,BC是一根水平绳子 .AC=4,BC=6.求滑轮在A处对杆的弹力F. 答案是5/4mg.为什么弹力方向由A指向BC中点呢](/uploads/image/z/13340880-0-0.jpg?t=AB%E6%98%AF%E9%95%BF%E7%9B%B4%E6%9D%86%2CA%E5%A4%84%E6%9C%89%E4%B8%80%E4%B8%AA%E6%BB%91%E8%BD%AE%2CAC%E6%98%AF%E5%A2%99%E9%9D%A2%2CBC%E6%98%AF%E4%B8%80%E6%A0%B9%E6%B0%B4%E5%B9%B3%E7%BB%B3%E5%AD%90+.AC%3D4%2CBC%3D6.%E6%B1%82%E6%BB%91%E8%BD%AE%E5%9C%A8A%E5%A4%84%E5%AF%B9%E6%9D%86%E7%9A%84%E5%BC%B9%E5%8A%9BF.+%E7%AD%94%E6%A1%88%E6%98%AF5%2F4mg.%E4%B8%BA%E4%BB%80%E4%B9%88%E5%BC%B9%E5%8A%9B%E6%96%B9%E5%90%91%E7%94%B1A%E6%8C%87%E5%90%91BC%E4%B8%AD%E7%82%B9%E5%91%A2)
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