题目内容
如图所示,质量m=1kg的小球用细线拴住,线长l=0.5m,细线所受的拉力达到F=18N时就会被拉断;当小球从图示位置释放后摆到悬点的正下方时,细线恰好被拉断;若此时小球距水平面的高度h=5m,重力加速度g取10m/s2,求小球落地处与细线恰被拉断时的位置间的距离?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241350534083888.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241350534083888.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053455544.png)
最低点:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053501793.png)
代入数据,得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053595571.png)
此时细线恰好被拉断,沿圆弧的最低点的切线方向以此速度飞出,做平抛运动。
竖直方向:
代入数据,得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053813378.png)
水平方向:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053845418.png)
代入数据,得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053954485.png)
合运动方向:
代入数据,得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135054531601.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053501793.png)
代入数据,得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053595571.png)
此时细线恰好被拉断,沿圆弧的最低点的切线方向以此速度飞出,做平抛运动。
竖直方向:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053642650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053813378.png)
水平方向:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053845418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053907168.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053954485.png)
合运动方向:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135053985624.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135054531601.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目