R And the track has a radius R, and at this moment in time the angle equals theta, and here is the object.

轨道半径是，在这个时刻,角度等于θ,这是物体。

youdao

Let this be the angle d theta so it moves in a short amount of time over an angle d theta dS and the arc here is dS, R and the radius is R.

这是角度dθ,它运动了一会儿,运动过角度dθ,弧度是，半径是。

youdao

That's exactly right, y0 because then the distance R between here and the y zero is R, so this is the potential energy as a function of angle theta.

它非常正确，因为这样，这里和,的距离是，因此这是势能,关于θ的变化。

youdao

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