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在天体运动这一知识点中,有三个问题始终是考试的热点,学生学习的难点,也是学生解题中的常见出错点.一、轨道变化问题1.同步卫星发射过程中进行轨道变化时,为什么需要加速?如图1所示,设卫星在近地圆轨道1上经过a点时的速率为v_1,在椭圆轨道2经过a点的速率为v_2,在椭圆轨道2经过b点的速率为v_3,在圆轨道3经过b点的速率为v_4.卫星速率为v_1时,做半径为r_1的圆周运
In the knowledge of celestial movement, there are three problems that are always the focus of examination, the difficulty of students ’study, and also a common error point in the students’ problem solving.One orbital change problem 1. When orbital changes occur in the process of launching a synchronous satellite, Why do we need to speed up? As shown in Figure 1, suppose the satellite passes through point a on the Earth’s orbit 1 at a rate of v_1, and the rate at which the elliptical orbit 2 passes a is v_2. v_3, the rate at which the circular orbit 3 passes through point b is v_4. When the satellite velocity is v_1, a circular circle having a radius of r_1