题目内容
如图所示为研究匀变速直线运动的实验中所选用的一段打点纸带,打点计时器的打点周期为0.02秒。在实验得到的纸带上确定七个计数点A、B、C、D、E、F、G,每两个相邻的计数点之间还有四个点没有画出,测得AB间的距离为
="3.61cm" ,BC间的距离为
=4.41cm, CD间的距离为
=5.20cm,DE间的距离为
=5.99cm(计算结果保留三位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017357925750.jpg)
① D点的瞬时速度
= m/s;
②小车的加速度
= m/s2。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735714300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735729331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735745331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735761319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017357925750.jpg)
① D点的瞬时速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735807482.png)
②小车的加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017358071582.png)
①
= 0.560m/s②
="0.793" m/s2(0.790 0.800)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735807482.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017358391572.png)
试题分析:①每两个相邻的计数点之间还有四个点没有画出即时间间隔
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735854449.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017358851165.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001735901521.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017359171271.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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