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第一宇宙速度是人造卫星环绕地球做匀速圆周运动的最大环绕速度,是人造地球卫星的最小发射速度,v=7·9km·s-1.推导:方法1当卫星在地球表面附近运动时
The first cosmic velocity is the maximum orbital velocity at which a satellite makes uniform circular orbits around the Earth and is the minimum launch velocity of a man-made earth satellite, v = 7 · 9 km · s -1. Derivation: Method 1 When a satellite moves near the Earth’s surface