题目内容
设北斗导航系统中的地球同步卫星在距地面高度为h的同步轨道做圆周运动。已知地球的半径为R,地球表面的重力加速度为g,万有引力常量为G。下列说法正确的是( )
A.同步卫星运动的周期为![]() |
B.同步卫星运行的线速度为![]() |
C.同步轨道处的重力加速度为![]() |
D.地球的平均密度为![]() |
C
试题分析:由于同步卫星与地球同步,做匀速圆周运动,地球的引力提供向心力,则有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027124001478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027124161179.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002712431726.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027124471145.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027124621221.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027125091089.png)
步轨道处的重力加速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002712525804.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002712431726.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002712540746.png)
地球的密度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027125721426.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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