题目内容
(8分)一颗在赤道上空飞行的人造地球卫星, 其轨道半径为r =3R(R为地球半径), 已知地球表面重力加速度为g,则:
(1)该卫星的运行周期是多大?
(2)若卫星的运动方向与地球自转方向相同, 已知地球自转角速度为
0,某一时刻该卫星通过赤道上某建筑物的正上方, 它下一次出现在该建筑物正上方经过多少时间?
(1)该卫星的运行周期是多大?
(2)若卫星的运动方向与地球自转方向相同, 已知地球自转角速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140151665.png)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301402132156.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140182831.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301402132156.png)
1)根据万有引力提供向心力可得,
,所以该卫星的运行周期
,又因为r =3R,黄金代换式
,可知周期![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140401826.png)
(2)设下一次出现在该建筑物正上方经过时间
,即有
,所以![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301404941145.png)
故答案为:(1)
,(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301404941145.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301402451080.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140338966.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140369690.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140401826.png)
(2)设下一次出现在该建筑物正上方经过时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140432374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301404471198.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301404941145.png)
故答案为:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140401826.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301404941145.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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