题目内容
重G=10N的小球,用长为l=1m的细线挂在A点,靠在半径R=1.3m的光滑大球面上.已知A点离球顶距离d=0.7m,求小球对绳的拉力和对大球的压力各为多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/201406110952398694424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/201406110952398694424.png)
受力分析如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/2014061109524002517194.png)
如图由三角形相似有:
=
=
解得:T=5NF=6.5N
答:小球对绳的拉力为6N,对大球的压力为6.5N.
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/2014061109524002517194.png)
如图由三角形相似有:
T |
G |
l |
R+d |
N |
G |
R |
R+d |
解得:T=5NF=6.5N
答:小球对绳的拉力为6N,对大球的压力为6.5N.
![](http://thumb2018.1010pic.com/images/loading.gif)
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