题目内容
某汽车从静止开始以加速度
匀加速启动,最后做匀速运动.已知汽车的质量为
,额定功率为
,匀加速运动的末速度为
,匀速运动的速度为
,所受阻力为
.下图是反映汽车的速度随时间及加速度、牵引力和功率随速度变化的图象,其中可能正确的是( ) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415323217610846.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153230101283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153230195338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153230678321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153230803302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153230944367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153231100318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415323217610846.png)
ACD
试题分析:汽车在运动过程中
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153232254745.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153232348516.png)
点评:此类题型考察了汽车以恒定加速度启动过程中各物理量变化问题。在这类问题中,通常是由速度引起牵引力变化,并随之使得加速度变化,而加速度变化又会影响速度的变化。
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目