题目内容
在“测定匀变速直线运动的加速度”实验中,用的是电火花计时器,它使用______电源(填交流或直流),电源频率为50赫兹,每隔______秒打一个点,得到记录纸带如下图所示,图中的点为记数点,在每两相邻的记数点间还有4个点没有画出,则VC =______, VE =_______ 小车运动的加速度为______
。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636137936776.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163613606489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636137936776.png)
交流 0.02s 0.51 m/s 0.91 m/s 2 ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163613606489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163613606489.png)
试题分析:电火花打点计时器采用的是220V的交流电压,根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163614120489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163614292880.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163614510689.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636150561028.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636152751051.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636155401312.png)
点评:在处理纸带问题时,往往根据匀变速直线运动的中间时刻速度等于该段过程的平均速度求解计数点的速度,根据逐差法求解物体运动的加速度,
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目