题目内容
拖拉机是农村的重要运输工具,某拖拉机的车头的前轮的直径d1=0.80m,后轮的直径d2=1.25m,两轮轴心相距L=2m,某时刻在前轮的最高点A一泥块被水平抛出,0.2s后在后轮的最高点B另一泥块也被水平抛出,两泥块恰好落在地面的同一位置,如图17所示,则拖拉机的速度是多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241153439423063.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241153439423063.gif)
由于两轮被拖拉机的底板连接在一起,故两轮的线速度相等,设拖拉机的速度为v,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115343957520.gif)
泥块被抛出后做平抛运动,则在水平方向的位移:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344004640.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344207673.gif)
由几何关系得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344223455.gif)
联立可得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344238507.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115343957520.gif)
泥块被抛出后做平抛运动,则在水平方向的位移:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344004640.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344207673.gif)
由几何关系得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344223455.gif)
联立可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115344238507.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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