题目内容
屋檐上每间隔一定时间滴出一滴水,当第5滴水滴正欲滴下时,第1滴刚好到达地面,而第3滴与第2滴水滴正分别位于高1m的窗户的上、下沿,(如图所示,取g = 10m/s2),试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241623555991124.png)
(1)相临两滴水的时间间隔;
(2)此时第2滴水距离地面的高度.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241623555991124.png)
(1)相临两滴水的时间间隔;
(2)此时第2滴水距离地面的高度.
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162356052714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162355740742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162356052714.png)
试题分析:(1)设相邻两滴水之间时间间隔为△t,第2滴、第3滴下落高度分别为h2、h3,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162356395169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162356395169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162357378889.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162357815890.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162355740742.png)
联立各式,得:△t=0.2s 2分
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241623583301104.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241623586261118.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162356052714.png)
点评:解决本题的关键掌握初速度为0的匀加速直线运动,在连续相等时间间隔内的位移比为1:3:5:7.以及掌握自由落体运动的位移时间公式
![](http://thumb2018.1010pic.com/images/loading.gif)
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