试题:如图1所示,将质量为m的匀质细铁链组成圆环,套在一个表面光滑的圆锥上,圆锥顶角为α,设圆锥底面水平,铁链圈平衡时在一平面上,该面与圆锥底面平行,则铁链内的张力大小为多少?错解:选半圆环为研究对象,图2对此进行受力分析,如图1图2所示.N代表圆锥体对半圆环的支持力,T代表 Test Question: As shown in Figure 1, a fine iron chain of mass m is made up of a ring and is set on a smooth surface cone with a conical apex angle, with the conical bottom surface leveled and the iron chain ring balanced in a plane. On the other hand, the surface is parallel to the base of the cone. What is the tension in the iron chain? Mistake: The half-ring is chosen as the study object. Figure 2 shows the force analysis, as shown in Figure 1 and Figure 2. N represents the cone Body support for half rings, T stands for