题目内容
特战队员在进行素质训练时,抓住一端固定在同一水平高度的不同位置的绳索,从高度一定的平台由水平状态无初速开始下摆,如图所示,在到达竖直状态时放开绳索,特战队员水平抛出直到落地。不计绳索质量和空气阻力,特战队员可看成质点。下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048438334961.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048438334961.png)
A.绳索越长,特战队员落地时的水平位移越大 |
B.绳索越长,特战队员在到达竖直状态时绳索拉力越大 |
C.绳索越长,特战队员落地时的水平速度越大 |
D.绳索越长,特战队员落地时的速度越大 |
C
试题分析:据题意,特战队员随绳摆动到最低点后做平抛运动,设绳子长度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843848280.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843864313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843879303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843895527.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843911773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843926650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048439421130.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843957929.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843973619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004843989792.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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