如图所示重为g的均匀硬棒悬于o点成竖直现在下端施一水平拉力让棒缓慢转至水平位置在棒转动的过程中拉力f始终与硬棒垂直则拉力fa逐渐变大 Template




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tomski如图所示重为g的均匀硬棒悬于o点成竖直现在下端施一水平拉力让棒缓慢转至水平位置在棒转动的过程中拉力f始终与硬棒垂直则拉力fa逐渐变大 coloring