题目内容
如图所示,卡车通过定滑轮以恒定的功率P0拉绳,牵引河中的小船沿水面运动,已知小船的质量为m,沿水面运动时所受的阻力为f且保持不变,当绳AO段与水平面夹角为θ时,小船的速度为v,不计绳子与滑轮的摩擦,则此时小船的加速度等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035071561548.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035071561548.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
A
试题分析:假设卡车速度是v0,对小船运动分解,小船的速度为v的沿绳分量与卡车速度相同,如图:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035072342279.png)
由几何关系可知,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003507249581.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003507265849.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035072803020.png)
由牛顿第二定律可知,小船加速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035072961094.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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