题目内容
不可回收的航天器在使用后,将成为太空垃圾。如图所示是漂浮在地球附近的太空垃圾示意图,对此有如下说法,正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911380384482.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911380384482.jpg)
A.离地越低的太空垃圾运行周期越小 |
B.离地越高的太空垃圾运行角速度越小 |
C.由公式v=![]() |
D.太空垃圾一定能跟同一轨道上同向飞行的航天器相撞 |
AB
试题分析:设地球质量为M,垃圾质量为m,垃圾的轨道半径为r;由牛顿第二定律可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911383821142.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191138678967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191138912928.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191139162835.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191139427902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191139708742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191139708742.png)
故选AB.
点评:太空垃圾绕地球做匀速圆周运动,地球的万有引力提供向心力,由牛顿第二定律列方程,求出线速度、角速度、周期的表达式,然后答题.
![](http://thumb2018.1010pic.com/images/loading.gif)
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