I'm glad to hear that no one counted this r equal zero as a node.
我很高兴没听到有人把r等于0这处也算作是一个节点。
At infinity, there's no stored potential energy, and it drops off more and more negative as one over R.
在无限远处,没有储存的势能,并且它向负方向减少,当距离超过R时。
If it's going in a circle, you will say from now on, that it, indeed, has an acceleration, even though no one's stepping on the accelerator, of amount v^2 over R.
如果它在一个圆周上运动,你会说从现在起它其实有加速度,即使没有人去踩油门,加速度大小为 v^2 / R
应用推荐