题目内容
如图6-2-14,摩托车做腾跃特技表演,以初速
冲上高为h、顶部水平的高台,然后从高台水平飞出。若摩托车始终以额定功率P行驶,经时间t从坡底到达坡顶,人和车的总质量为m,且各种阻力的影响可忽略不计,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201001192742.gif)
小题1:人和车到达坡顶时的速度
;
小题2:人和车飞出的水平距离s;
小题3:当h为多少时,人和车飞出的水平距离最远?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100103196.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201001192742.gif)
小题1:人和车到达坡顶时的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100134182.gif)
小题2:人和车飞出的水平距离s;
小题3:当h为多少时,人和车飞出的水平距离最远?
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100165620.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100197754.gif)
小题3:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100212612.gif)
小题1:
对人从坡底到达坡顶,利用动能定理:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100212645.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100243620.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201002591189.gif)
小题3:
利用不等式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100275471.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100290604.gif)
即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120100212612.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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