题目内容
如图所示,长度为L=1m的绳,系一小球在竖直平面内做圆周运动,小球的质量为M=0.5kg,小球直径不计,小球通过最低点时的速度大小为v=2m/s,试计算:
(1)小球在最低点的向心加速度;
(2)小球在最低点所受绳子的拉力。(g取10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241339374591078.png)
(1)小球在最低点的向心加速度;
(2)小球在最低点所受绳子的拉力。(g取10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241339374591078.png)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133937708402.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133937505542.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133937708402.png)
(1)向心加速度公式
(5分)
(2)在最低点时
(5分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133937771858.png)
(2)在最低点时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241339378641206.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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