问题:一个质量为M的小球用一根很长的细线悬挂在很高的天花板上,在其右侧有一质量为m的另一小球用长为l的细线悬挂在固定点O,两小球用一根很短的轻杆相连接,平衡时轻杆水平且两细线竖直平行(如图1所示),不计空气阻力,现将两小球从平衡位置图1图2拉离左边使细线偏离竖直方向一个 The problem: A ball of mass M is suspended from a very high ceiling with a long thin wire. On the right side there is a small ball of mass m suspended at a fixed point by a thin wire of length l. The two balls are connected by a very short light bar. When the balance is done, the light bar is horizontal and the two thin lines are parallel (as shown in Figure 1). Excluding air resistance, the two balls are now in equilibrium. Figure 1 2 Pull left from the left so that the thin line deviates from the vertical one