题目内容
一个宇航员在半径为R的星球上以初速度v0竖直上抛一物体,经t后物体落回宇航员手中.
(1)该星球表面重力加速度gx是多少?
(2)为了使沿星球表面抛出的物体不再落回星球表面,抛出时的速度至少为多少?
(1)该星球表面重力加速度gx是多少?
(2)为了使沿星球表面抛出的物体不再落回星球表面,抛出时的速度至少为多少?
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231447902739.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231446669627.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231447902739.png)
试题分析:(1)由竖直上抛运动的公式得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231448494621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231446669627.png)
(2)为了使沿星球表面抛出的物体不再落回星球表面,抛出时的速度满足
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231451131772.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231452426888.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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