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题目:如图所示,质量 m=2.0千克的小铁块静止于水平导轨 AB 的 A 端.导轨及支架ABCD 的形状、尺寸如图所示.支架只能绕通过C点或D点垂直于纸面的水平轴转动.支
Title: As shown in the figure, the small mass of iron with mass m=2.0 kilograms is stationary at the end of the horizontal guide rail AB. The shape and dimensions of the guide rail and bracket ABCD are shown in the figure. The bracket can only pass around point C or point D perpendicular to The horizontal axis of the paper is rotated.