题目内容
如图,两个半径均为R的1/4光滑圆弧对接于O点,有物体从上面圆弧的某点C以上任意位置由静止下滑(C点未标出),都能从O点平抛出去,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010155593537.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010155593537.png)
A.∠CO1O=60° |
B.∠CO1O=45° |
C.落地点距O2最远为2R |
D.落地点距O2最近为R |
AC
试题分析:据题意,当物体从C点下滑后能够从O点做平抛运动,说明小球在O点的速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015575505.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015606796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015621550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015637459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015653745.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015684801.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001015699466.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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