题目内容
物理学中有些问题的结论不一定必须通过计算才能验证,有时只需要通过一定的分析就可以判断结论是否正确。如图所示,AB为倾角为
的斜面,小球从A点以初速度v0(方向与斜面成
角)抛出,恰好落到斜面底端的B点,不计空气阻力,则AB两点间的距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241245125441998.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124512435302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124512466319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241245125441998.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
C
本题考查选择题的解题技巧方法。取一特殊值,当
时运动时间
,
,把
代入四个选项只有C符合,选C。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124512778376.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124512810801.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241245128251268.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124512778376.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() |
C.![]() | D.![]() |