题目内容
如图所示,一底端有挡板的斜面体固定在水平面上,其斜面光滑,倾角为
。一个劲度系数为k的轻弹簧下端固定在挡板上,上端与物块A连接在一起,物块B紧挨着物块A静止在斜面上。某时刻将B迅速移开,A将在斜面上做简谐运动。已知物块A、B的质量分别为mA、mB,若取沿斜面向上为正方向,移开B的时刻为计时起点,则A的振动位移随时间变化的图像是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209246664756.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209250259443.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209254628587.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824220923855255.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209246664756.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209250259443.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242209254628587.jpg)
B
试题分析:刚移开B时应为简谐振动的最低点,此时弹簧的形变量:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824220926367396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824220927147337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824220928083373.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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