8.如图所示,一块涂有炭黑的玻璃板,质量为2kg,在拉力F的作用下,由静止开始竖直向上做匀变速运动,一个装有水平振针的振动频率为5Hz的固定电动音叉在玻璃板上画出了图示曲线,量得OA=1.5cm,BC=3
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![8.如图所示,一块涂有炭黑的玻璃板,质量为2kg,在拉力F的作用下,由静止开始竖直向上做匀变速运动,一个装有水平振针的振动频率为5Hz的固定电动音叉在玻璃板上画出了图示曲线,量得OA=1.5cm,BC=3](/uploads/image/z/9631349-53-9.jpg?t=8.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%80%E5%9D%97%E6%B6%82%E6%9C%89%E7%82%AD%E9%BB%91%E7%9A%84%E7%8E%BB%E7%92%83%E6%9D%BF%2C%E8%B4%A8%E9%87%8F%E4%B8%BA2kg%2C%E5%9C%A8%E6%8B%89%E5%8A%9BF%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%8B%2C%E7%94%B1%E9%9D%99%E6%AD%A2%E5%BC%80%E5%A7%8B%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8A%E5%81%9A%E5%8C%80%E5%8F%98%E9%80%9F%E8%BF%90%E5%8A%A8%2C%E4%B8%80%E4%B8%AA%E8%A3%85%E6%9C%89%E6%B0%B4%E5%B9%B3%E6%8C%AF%E9%92%88%E7%9A%84%E6%8C%AF%E5%8A%A8%E9%A2%91%E7%8E%87%E4%B8%BA5Hz%E7%9A%84%E5%9B%BA%E5%AE%9A%E7%94%B5%E5%8A%A8%E9%9F%B3%E5%8F%89%E5%9C%A8%E7%8E%BB%E7%92%83%E6%9D%BF%E4%B8%8A%E7%94%BB%E5%87%BA%E4%BA%86%E5%9B%BE%E7%A4%BA%E6%9B%B2%E7%BA%BF%2C%E9%87%8F%E5%BE%97OA%3D1.5cm%2CBC%3D3)
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