题目内容
由消防水龙带的喷嘴喷出水的流量是0.28m3/min,水离开喷口时的速度大小为16
m/s,方向与水平面夹角为60度,在最高处正好到达着火位置,忽略空气阻力,则空中水柱的高度和水量分别是(重力加速度g取10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004223473344.png)
A.28.8m,1.12×10-2m3 | B.28.8m,0.672m3 |
C.38.4m,1.29×10-2m3 | D.38.4m,0.776m3 |
A
试题分析:水在空中做斜抛运动,将水的速度分解到水平方向和竖直方向,在竖直方向上的分初速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042235041031.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004223520967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004223535749.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042235661241.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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