题目内容
地球质量大约是月球质量的81倍,一个飞行器在地球与月球之间,当地球对它的引力和月球对它的引力大小相等时,该飞行器距地心的距离与距月心的距离之比为:
A.1:9 | B.9:1 | C.1:27 | D.27:1 |
B
试题分析:我们可设月球质量为M,那么地球质量就为81M.设飞行器距地心距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185718726294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185718945321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241857192571052.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185719491779.png)
故选B
点评:关键是抓住两者对飞行器的引力相等列式,基础题,比较简单
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1:9 | B.9:1 | C.1:27 | D.27:1 |