1“双球摆”悖论本刊2005年第4期刊登了“‘双球摆’悖论”的文章,主要内容如下.如图1,将长度为l的A、B两根杆与质量均为m的a、b两个小球固结在一起,A杆用光滑铰链O固定,这个装置叫双球摆.把双球摆拉到水平位置静止释放,在下摆过程中,通过计算知道,a球的机械能减小,b球的机械能 1 “Double Ball Pendulum” Paradox published in the 4th issue of the magazine “The Paradox of Two Balls”. The main contents are as follows. As shown in Figure 1, two poles A and B of length l are used. The balls a and b of m are fixed together, and the A rod is fixed with a smooth hinge O. This device is called a double ball pendulum. The double ball is pulled to a horizontal position and released at rest. During the process of the pendulum, it is known through calculations. The mechanical energy of a ball is reduced, and the mechanical energy of b ball