题目内容
假设某行星的质量与地球的质量相等,半径为地球半径的4倍,要从该行星上发射一颗绕它自身运动的卫星,那么它的“第一宇宙速度”(最大环绕速度)大小应为地球上的第一宇宙速度的多少倍?(要求有计算过程)
设地球的第一宇宙速度为V;另一行星的第一宇宙速度为Vˊ
=
V=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803622663.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803653179.png)
=
=
V’=
V
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803559717.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803590599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803622663.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803653179.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803684421.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803700364.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803762346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803762346.png)
设地球的第一宇宙速度为v;另一行星的第一宇宙速度为v‘
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803809647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803871654.png)
所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803918647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803934447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803809647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803871654.png)
所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803918647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123803934447.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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