题目内容
一根内壁光滑的
圆周细钢管,形状如图所示,A与圆心在同一水平面内,一小钢球被一弹簧枪从A处正对管口射入,射击时无机械能损失.第一种情况欲使小钢球恰能到达C点;第二种情况欲使钢球经C后飞出,恰好又落回A点,这两种情况下弹簧枪的弹性势能之比为________.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241139219781863.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113921962227.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241139219781863.jpg)
4∶5
第一种情况弹簧枪的弹性势能EA1=mgR
第二种情况弹簧枪的弹性势能EA2=mgR+
mvc2
由平抛运动知识得vC=
,则
=
.
第二种情况弹簧枪的弹性势能EA2=mgR+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113921994225.gif)
由平抛运动知识得vC=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113922134355.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113922196316.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113922212227.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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