题目内容
如图所示,在光滑水平地面上放着两个物体,其间用一根不能伸长的细绳相连,开始时B静止,A具有4kg·m/s的动量(令向右为正),开始绳松弛.在绳拉紧(可能拉断)的过程中,A、B动量的变化可能为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400418101413.png)
A.
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041903914.png)
B.
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041997927.png)
C.
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140042090919.png)
D.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400421371042.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400418101413.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041841933.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041903914.png)
B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041950930.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140041997927.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140042044936.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140042090919.png)
D.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400421371042.png)
C
在绳子拉紧的一瞬间系统动量守恒,并且A 的动量减小B的动量增大,系统的机械能有损失,选项A中系统机械能没有损失,A错;B错;C对;系统动量不可能增大,D错;
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容