题目内容
现代观测表明,由于引力作用,恒星有“聚集”的特点,.众多的恒星组成不同层次的恒星系统,最简单的恒星系统是两颗互相绕转的双星,如图所示,两星各以一定速率绕其连线上某一点匀速转动,这样才不至于因万有引力作用而吸引在一起,已知双星质量分别为m1、m2,它们间的距离始终为L,引力常数为G,求:?
(1)双星旋转的中心O到m1的距离;?(5分)
(2)双星的转动周期.?(5分)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347413871162.jpg)
(1)双星旋转的中心O到m1的距离;?(5分)
(2)双星的转动周期.?(5分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347413871162.jpg)
(1)
(2) 2πL![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741527860.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741465652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741527860.png)
设m1到中心O的距离为x?
由 F引=F向知 ? G
①
G
②
联立①②求解得?x=
T=2πL
由 F引=F向知 ? G
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741559967.png)
G
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347416371140.png)
联立①②求解得?x=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741465652.png)
T=2πL
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134741527860.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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