题目内容
如图所示,两个光滑小球P、Q先后卡在宽度不同、内壁光滑的两个槽中.甲、乙两图中球P对槽底的压力分别为FA、
,对左侧壁B处和
处的压力分别为FB、
,球Q对右侧壁C处和
处的压力分别为FC、
,则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241220386692922.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038326227.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038451214.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038467232.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038482213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038654228.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241220386692922.jpg)
A.FA=![]() ![]() ![]() |
B.FA=![]() ![]() ![]() |
C.FA![]() ![]() ![]() |
D.FA![]() ![]() ![]() |
B
由整体法,可得FA=
,FB=-FC,
=-
,即B正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038326227.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038467232.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122038654228.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目