题目内容
(8分)【物理-物理3-5】
(1)(2分)置于铅盒中的放射源发射的
、
和
三种射线,由铅盒的小孔射出,在小孔外放一张铝箔,铝箔后的空间有一匀强电场。射线进入电场后,变为a、b两束,射线a沿原来方向行进,射线b发生了偏转,如图所示,则图中的射线a为_________射线,射线b为___________射线。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241215060305017.jpg)
(2)(6分)如图所示,平放在水平面上的轻质弹簧的一端固定在竖直墙上,质量为
的光滑弧形槽静止在光滑水平面上,底部与水平面平滑连接。一个质量为
的小球从槽
高处由静止开始下滑,要使小球能与弧形槽发生第二次作用,
、
应满足怎样的条件?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241215061083992.jpg)
(1)(2分)置于铅盒中的放射源发射的
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121505983201.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121505999217.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506014191.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241215060305017.jpg)
(2)(6分)如图所示,平放在水平面上的轻质弹簧的一端固定在竖直墙上,质量为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506046219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506061325.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506077200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506046219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506061325.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241215061083992.jpg)
(1)(2分)
(1分)
(1分)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506155398.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506014191.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121505999217.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506155398.gif)
(1)(2分)
(1分)
(1分)
(2)(6分)解:设弧形槽与小球第一次分离后的速度大小分别为
和![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506233205.gif)
弧形槽和小球在水平方向满足动量守恒
--------------------------3分
小球与弹簧发生作用后以原速率返回,要使小球和弧形槽发生第二次作用
则满足
----------------------------------------------------------------------------2分
所以弧形槽和小球的质量应满足
----------------------------------
-------1分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506014191.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121505999217.gif)
(2)(6分)解:设弧形槽与小球第一次分离后的速度大小分别为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506217200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506233205.gif)
弧形槽和小球在水平方向满足动量守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506233454.gif)
小球与弹簧发生作用后以原速率返回,要使小球和弧形槽发生第二次作用
则满足
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506264260.gif)
所以弧形槽和小球的质量应满足
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121506155398.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412150628065.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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