题目内容
(6分)某研究性学习小组在做“验证机械能守恒定律”的实验中,已知打点计时器所用电源的频率为
,查得当地重力加速度
.测得所用重物的质量为
,实验中得到一条点迹清晰的纸带,把第一个点记作
,每两个计数点之间还有几个点未画出,另选择连续的3个计数点
、
、
作为测量的点,如图所示,经测量知道
、
、
各点到
点的距离分别为
、
、
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021006361695.png)
根据以上数据可以获知两计数点间的时间间隔为 s,重物由
点运动到
点,重力势能减少了
,动能增加了
.(保留三位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100183476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100199712.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100277529.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100293252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100308298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100355306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100480306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100308298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100355306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100480306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100293252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100573539.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100589588.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100605579.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021006361695.png)
根据以上数据可以获知两计数点间的时间间隔为 s,重物由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100293252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100355306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100667266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100667266.png)
t=0.1s
(每空2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100698775.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100714717.png)
试题分析: 由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100745421.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100761891.png)
重物由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100293252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100355306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100823699.png)
运动到B点时的速度:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100839702.png)
重物由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100293252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100355306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002100901714.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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