题目内容
静止的城市绿化洒水车,由横截面积为S的水龙头喷嘴水平喷出水流,水流从射出喷嘴到落地经历的时间为t,水流落地点与喷嘴连线与水平地面间的夹角为
,忽略空气阻力(重力加速度g取10
),以下说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859050273.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859066388.png)
A.水流射出喷嘴的速度为![]() | B.空中水柱的水量为![]() |
C.水流落地时位移大小为![]() | D.水流落地时的速度为![]() |
B
试题分析:由题意知,水做平抛运动,θ为总位移与水平方向的夹角,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859175945.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859190783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859222651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003859237933.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038592531077.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038592841309.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目