题目内容
如图所示, 在内壁光滑的平底试管内放一个质量为1g的小球, 试管的开口端加盖与水平轴O连接. 试管底与O相距5cm, 试管在转轴带动下沿竖直平面做匀速圆周运动. 求:
(1) 转轴的角速度达到多大时, 试管底所受压力的最大值等于最小值的3倍.
(2) 转轴的角速度满足什么条件时,会出现小球与试管底脱离接触的情况? g取10m/s
.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329386201674.jpg)
(1) 转轴的角速度达到多大时, 试管底所受压力的最大值等于最小值的3倍.
(2) 转轴的角速度满足什么条件时,会出现小球与试管底脱离接触的情况? g取10m/s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938542242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329386201674.jpg)
(1)根据合力提供向心力有:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938652765.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938698743.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938730759.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938776768.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329388231076.png)
(2)临界时重力完全提供向心力,有:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938886650.png)
得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329389321062.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938652765.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938698743.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938730759.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938776768.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329388231076.png)
(2)临界时重力完全提供向心力,有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132938886650.png)
得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329389321062.png)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目