题目内容
(8分)用如图所示装置测重锤下落过程中所受阻力的大小.测出重锤质量为
,从高处由静止开始落下,重锤上拖着的纸带通过打点计时器打出一系列的点.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500292252020308.png)
①纸带上A、B、C、D、E为连续的五个计数点,两相邻计数点间有1个打下的点,但纸带上有一段不太清洁,C点不能准确定位.测出A点距起始点
的距离为
,点A、B间的距离为
,点D、E间的距离为
,如题6图2所示.使用交流电的频率为
.则根据这些条件计算重锤下落的加速度
的表达式为:
.
②若已知当地重力加速度的值为
,试用这些物理量和纸带上的测量数据表示出重锤在下落的过程中受到的平均阻力大小为
= .
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922504337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500292252020308.png)
①纸带上A、B、C、D、E为连续的五个计数点,两相邻计数点间有1个打下的点,但纸带上有一段不太清洁,C点不能准确定位.测出A点距起始点
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922551292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922582318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922598283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922613316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922645304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922645283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922660299.png)
②若已知当地重力加速度的值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922676273.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922707302.png)
①
(4分) ②
(4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922738726.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922754981.png)
试题分析:①由交流电的打点周期为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922769513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922801472.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922816645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922832817.png)
②对重锤由牛顿第二定律可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002922847602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029228631316.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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