题目内容
我国建成的北斗导航卫星系统包含多颗地球同步卫星,这有助于减少我国对GPS导航系统的依赖,GPS由运行周期为12小时的卫星群组成,设北斗导航系统中的同步卫星和GPS导航卫星的周期分别为T1和T2,轨道半径分别为R1和R2,则
A.T1:T2=2:l | B.T1:T2=1:2 |
C.R1:R2=![]() | D.R1:R2=2:1 |
AC
试题分析:AB、地球同步卫星的周期为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171236471319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171236861365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171237297550.png)
CD、由万有引力定律的公式和向心的公式有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241712379681140.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241712383271027.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241712385451211.png)
故选AC
点评:人造地球卫星绕地球做匀速圆周运动的向心力为地球对卫星的万有引力.根据万有引力定律和匀速圆周运动的规律可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241712390131562.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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