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关于卫星运行轨道,教材中有如下说明:如果人造卫星进入地面附近的轨道速度大于7.9km/s,而小于11.2km/s,它绕地球运动的轨迹就不是圆形,而是椭圆.这是为什么呢?人造地球卫星做椭圆运动时,线速度有什么特点?如图1,卫星从近地点A经M到远地点B的过程中离地球越来越远,后又从B经N到A的过程中离地球越来越近,是什么原因使卫星产生这种运动?卫星在整个椭圆运动过程中遵循什么规律?
With respect to the orbit of satellites, the teaching materials have the following explanation: If the orbit speed of an artificial satellite entering the ground is greater than 7.9km/s and less than 11.2km/s, its orbit around the earth is not a circle but an ellipse. This is Why? What are the characteristics of linear velocity when man-made earth satellites do elliptical motion? As shown in Figure 1, the satellite moves from the perigee A through M to the far site B farther and farther from the earth, and then goes from B to N to A. What is the reason for satellites to produce such movements and the rules that satellites follow during the entire elliptical movement?