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题目.如图1所示,A、B、C为3个质点,A的质量远远大于B、C的质量,B和C的质量相等.已知A、B之间,A、C之间存在相互吸引力.B、C之间存在相互排斥力,3个质点在相互间引力或斥力的作用下运动,如果作用力合适,可以存在一种如下形式的运动.A、B、C的相对位置固定,它们构成一个平面,3个质点绕着位于这个平面内的某条轴匀速转动;因为质点A的质量远远大于B、C的质量,可认
As shown in Figure 1, A, B, C for the three particles, A mass is much greater than the quality of B, C, B and C equal mass known A, B, between A, C There is mutual attraction between the B, C there is mutual repulsion, the three particles in the mutual attraction or repulsion under the action of exercise, if the force is appropriate, there can be a form of the following movement.A, B, C relative Position fixed, they constitute a plane, the three particles around a plane located in this plane at a constant rotation; because the mass A is much greater than the quality of B, C can be identified