题目内容
如图所示,
能在水平光滑杆上自由滑动,滑杆连架装在转盘上.
用绳跨过在圆心处的光滑滑轮与另一质量为
的物体相连.当转盘以角速度
转动时,
离轴距离为
,且恰能保持稳定转动.当转盘转速增至原来的2倍,调整
使之达到新的稳定转动状态,则滑块
( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153228713908.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227512386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227512386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227668338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227933290.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227512386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153228245260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153228245260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153227512386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153228713908.png)
A.所受向心力变为原来的4倍 | B.线速度变为原来的![]() |
C.半径r变为原来的![]() | D.M的角速度变为原来的![]() |
B
试题分析:由题意可知质量为m物体的重力提供M物体转动需要的向心力即:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153229430764.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153229633520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153229914641.png)
点评:此类题型考察了匀速圆周运动向心力公式的各种变形。在本题中要始终注意向心力来源为质量为m的物体的重力。
![](http://thumb2018.1010pic.com/images/loading.gif)
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