如图所示,绝缘弹簧的下端固定在斜面底端,弹簧与斜面平行,带电小球Q(可视为质点)固定在光滑绝缘斜面上的M点,且在通过弹簧中心的直线ab上。现把与Q大小相同,带电性也相同的小球P,从直线ab上的N点由静止释放,在小球P与弹簧接触到速度变为零的过程中( )
![](https://img.xkw.com/dksih/QBM/2020/10/22/2576626348441600/2579135802400768/STEM/4e064352-6b29-4310-8e8f-60f5e4f6b413.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/2020/10/22/2576626348441600/2579135802400768/STEM/4e064352-6b29-4310-8e8f-60f5e4f6b413.png?resizew=190)
A.小球P的速度一直减小 |
B.小球P和弹簧组成的系统机械能守恒 |
C.小球P的动能最大时,其动能等于电场力与重力做功代数和 |
D.整个过程小球机械能变化量等于电场力与弹簧弹力做功代数和 |
更新时间:2020-10-26 08:08:08
|
【知识点】 利用功能关系计算电场力做的功及电势能的变化
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