题目内容
火星直径约为地球的一半,质量约为地球的十分之一,它绕太阳公转的轨道半径约为地球公转半径的1.5倍.根据以上数据,以下说法正确的是( ).
A.火星表面重力加速度的数值比地球表面的小 |
B.火星公转的周期比地球的长 |
C.火星公转的线速度比地球的大 |
D.火星公转的向心加速度比地球的大 |
AB
本题考查万有引力定律和有关天体运动的问题,意在考查学生对天体运动中各物理量之间的相互关系的掌握情况和分析比较能力.由mg=
得:
=
·
=
×
=
,所以选项A正确;由G
=M
r,得T=
,
=
=
>1,所以选项B正确;由G
=M
,得v=
,a=
=
,所以选项C、D都不对.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721097738.png)
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![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721238575.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721253970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721269545.png)
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![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721300445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721222675.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721331424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721347742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721331424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003721378710.png)
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