题目内容
电磁火箭总质量 M ,光滑竖直发射架宽 L,高H ,架处于匀强磁场 B,发射电源电动势为 E,内阻r,其他电阻合计为R,闭合 K 后,火箭开始加速上升,当火箭刚好离开发射架时,刚好到达最大速度,则求火箭能飞行的最大高度。(设重力加速度恒为g)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204486902192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448706868.gif)
Mg=BIL………………2’
E感=BLVm………………2’
I=
………………2’
∴Vm=
………………2’
M
=Mgh………………2’
h=
=
…
E感=BLVm………………2’
I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448721475.gif)
∴Vm=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448737726.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448753225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448768338.gif)
h=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448784408.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120448706868.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目