题目内容
如右图所示,一运送救灾物资的直升飞机沿水平方向匀速飞行.已知物资的总质量为m,吊运物资的悬索与竖直方向成θ角.设物资所受的空气阻力为F阻,悬索对物资的拉力为F,重力加速度为g,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242143480951595.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242143480951595.jpg)
A.![]() | B.![]() |
C.F=mgcos θ | D.![]() |
B
试题分析:以物资为研究对象,分析受力情况:重力mg、悬索对物资的拉力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214351215229.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214352120353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214352120353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214351215229.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242143557231188.png)
故选B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242143568312938.jpg)
点评:本题是实际的情景,实质是简单的物体平衡问题,分析受力、作出力图是关键.
![](http://thumb2018.1010pic.com/images/loading.gif)
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