a very easy question (_physical 一带电油滴在匀强电场E中的运动轨迹是一条类抛物线(从a到b),电场方向竖直向下.若不计空气阻力,则此带电油滴从a运动到b的过程中,能量变化情况为()A动能减少B
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averyeasyquestion(_physical一带电油滴在匀强电场E中的运动轨迹是一条类抛物线(从a到b),电场方向竖直向下.若不计空气阻力,则此带电油滴从a运动到b的过程中,能量变化情况为(
a very easy question (_physical 一带电油滴在匀强电场E中的运动轨迹是一条类抛物线(从a到b),电场方向竖直向下.若不计空气阻力,则此带电油滴从a运动到b的过程中,能量变化情况为()A动能减少B
a very easy question (_physical
一带电油滴在匀强电场E中的运动轨迹是一条类抛物线(从a到b),电场方向竖直向下.若不计空气阻力,则此带电油滴从a运动到b的过程中,能量变化情况为()
A动能减少
B电势能增加
C动能和电势能之和减少
D重力势能和电势能之和增加
我选的是D吖,为什么不可以,重力势能不是增加了吗?
a very easy question (_physical 一带电油滴在匀强电场E中的运动轨迹是一条类抛物线(从a到b),电场方向竖直向下.若不计空气阻力,则此带电油滴从a运动到b的过程中,能量变化情况为()A动能减少B
总能量守恒
从a到b动能增加
重力势能和电势能之和减少
重力势能没增加也没减少,因为重力势能不变,动能也不变,电视能做正功,电视能减少,c正确
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