题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133440204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133659235.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133659235.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133861204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133877218.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133877428.gif)
(1)小球释放后,第一次经过最低点D时的速度和对管壁的压力;
(2)小球释放后,第一次经过最高点C时管壁对小球的作用力。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201338933959.jpg)
(1)5mg,方向向下(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133908427.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133924230.gif)
(1)A至D点,由动能定理
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133971703.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134002370.gif)
由牛顿第二定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134017597.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134033449.gif)
由牛顿第三定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134049404.gif)
对管壁的压力为5mg,方向向下
(2)第一次经过C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134064728.gif)
设管壁对小球的作用力向下
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134064610.gif)
的方向向下
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133971703.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134002370.gif)
由牛顿第二定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134017597.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134033449.gif)
由牛顿第三定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134049404.gif)
对管壁的压力为5mg,方向向下
(2)第一次经过C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134064728.gif)
设管壁对小球的作用力向下
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120134064610.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133908427.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120133924230.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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