题目内容
(1)绳子的拉力FT;
(2)气球受到的水平风力F。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241202129713640.jpg)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120212986397.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120212971400.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120212986397.gif)
对氢气球受力分析如图…………………画出受力图2分
(1)竖直方向受力平衡,则
F浮=G+FTsin60°…………………………………2分
得FT=
…………………………1分
(2)水平方向受力平衡,则F=FTcos60°=
…………………………3分
(1)竖直方向受力平衡,则
F浮=G+FTsin60°…………………………………2分
得FT=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213002577.gif)
(2)水平方向受力平衡,则F=FTcos60°=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213018567.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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