题目内容
如图所示,离水平地面一定高处水平固定一内壁光滑的圆筒,筒内固定一轻质弹簧,弹簧 处于自然长度.现将一小球从地面上某一点P处,以某一初速度斜向上抛出,小球恰好能水平进入圆筒中,不计空气阻力.则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028514604568.jpg)
A小球抛出点P离圆筒的水平距离越远,抛出的初速度越大
B.小球从抛出点P运动到圆筒口的时间与小球抛出时的初速度方向有关
C.弹簧获得的最大弹性势能
与小球抛出点位置
无关
D.小球从抛出到将弹簧压缩到最短的过程中,小球的机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028514604568.jpg)
A小球抛出点P离圆筒的水平距离越远,抛出的初速度越大
B.小球从抛出点P运动到圆筒口的时间与小球抛出时的初速度方向有关
C.弹簧获得的最大弹性势能
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851476378.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851491313.png)
D.小球从抛出到将弹簧压缩到最短的过程中,小球的机械能守恒
A
试题分析:小球从抛出到将弹簧压缩至最短的过程,小球的动能、重力势能和弹簧的弹性势能总量守恒,小球的机械能并不守恒,D错误;小球抛出后,竖直方向是上抛运动,水平方向是匀速运动,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851507650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851538633.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851554475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851569640.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851601916.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851616874.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851632418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851663471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851632418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851663471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002851491313.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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