题目内容
在“探究单摆的周期与摆长的关系”的实验中,为防止摆球在摆动过程中形成“圆锥摆”,实验中采用了如图实-9-6甲所示的双线摆.测出摆线长度为L,线与水平横杆夹角为θ,摆球半径为r.若测出摆动的周期为T,则此地重力加速度为_______;某同学用10分度的游标卡尺测量摆球的直径时,主尺和游标如图乙所示,则摆球的半径r为_______mm.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241419077584302.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241419077584302.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141907789935.png)
单摆的摆长为l=Lsinθ+r,由周期公式
T=2π
,此地的重力加速度为g=
.
由图知摆球的半径
r=
×16.0 mm=8.0 mm.
T=2π
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141907836475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141907789935.png)
由图知摆球的半径
r=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141907961338.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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