题目内容
如图所示,一圆锥摆摆长为L,下端拴着质量为m的小球,当绳子与竖直方向成θ角时,绳的拉力大小F是多少?圆锥摆周期T是多少? (重力加速度为g) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241419256822032.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241419256822032.png)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141925823846.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141925745758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141925823846.png)
(1)对小球受力分析,可得:
①
(2)对小球受力分析,可得:
②
又:
③
联立解得:
④
本题考查的是圆周运动的问题,根据受力分析得出圆锥摆的向心力表达式,进而得到运动周期;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141925745758.png)
(2)对小球受力分析,可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141926041759.png)
又:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241419261041091.png)
联立解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141925823846.png)
本题考查的是圆周运动的问题,根据受力分析得出圆锥摆的向心力表达式,进而得到运动周期;
![](http://thumb2018.1010pic.com/images/loading.gif)
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