题目内容
如图所示,ABC是一条由一个半圆和一段斜面组成的光滑轨道,半圆轨道与轨道BC在同一竖直平面内且在B点平滑连接。A、B两点在同一竖直线上,且已知半圆半径为R。今在水平地面上某一点P处抛出一个小球,使它恰好从A点相切进入轨道(此过程不相碰),在B点处无能量损失,最后沿斜面上升到高度为H处。试求小球抛出点P点的位置,抛射速度Vp以及抛射角
(不计空气阻力)。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355340832612.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534021297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355340832612.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534146869.png)
C-A的过程中机械能守恒
(4分)
C-P运动过程中机械能守恒
(4分)
A-P 平抛
联立
(4分)
抛射角
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355341611034.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534208852.png)
C-P运动过程中机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534239820.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534317635.png)
A-P 平抛
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534536676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534739544.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534817887.png)
抛射角
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135534146869.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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