题目内容
(4分)如图是通过重物自由下落的实验验证机械能守恒定律。关于本实验下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023368544731.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023368544731.png)
A.从实验装置看,该实验可用4-6伏的直流电源 |
B.用公式![]() |
C.本实验中不需要测量重物的质量 |
D.测纸带上某点的速度时,可先测出该点到起点间的时间间隔,利用公式![]() |
BC
试题分析: 电磁打点计时器采用的是4~6V低压交流电源,选项A错误。验证的方程若是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336870795.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336917498.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336932586.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336948337.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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