题目内容
如图(甲)所示,一根轻绳上端固定在O点,下端拴一个重为G的钢球A,球处于静止状态.现对球施加一个方向向右的外力F,使球缓慢偏移,在移动中的每一刻,都可以认为球处于平衡状态.如果外力F方向始终水平,最大值为2G,试分析:
(1)(2分)轻绳张力T的大小取值范围__________________
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241312382235151.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241312385663870.png)
(2)(2分)画出能反映轻绳张力(T)与cosθ的关系图象.
(1)(2分)轻绳张力T的大小取值范围__________________
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241312382235151.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241312385663870.png)
(2)(2分)画出能反映轻绳张力(T)与cosθ的关系图象.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131238597374.png)
开始静止时绳的拉力T最小等于G,由于F始终水平,当F=2G时T最大等于
.根据平衡条件T=G/cosθ,T-cosθ图像如图所示。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131238644909.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241312386752030.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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