题目内容
[物理——选修3-5](15分)
(1)(5分)以下说法正确的是( )
(2)(10分)一长为
,质量为M的木板静止在光滑的水平面上,一质量为
的滑块的初速度
滑到木板上,木板长度至少为多少才能使滑块不滑出木板。(设滑块与木板间动摩擦因数为
)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223427656266.jpg)
(1)(5分)以下说法正确的是( )
A.当氢原子从n = 4的状态跃迁到n = 2的状态时,发射出光子 |
B.光电效应和康普顿效应都揭示了光具有波动性 |
C.原子核的半衰期与原子所处的化学状态和外部条件有关 |
D.比结合能越大,原子核中核子结合得越牢固,原子越稳定 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342485185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342500204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342563204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223427656266.jpg)
(1)AD
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342781692.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342781692.gif)
(1)(5分)( AD )
(2)(10分)解析:滑块与木板相互作用系统动量守恒,滑块不从木板上滑出则滑块与木板有相等的末速度。设末速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342797185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342812237.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342828568.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412234284365.gif)
由动能定理得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342859753.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342875702.gif)
由②③得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342890858.gif)
代入得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122342781692.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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