因此，速度的大小即是,矢量V的模长。

So, speed, which is the scalar quantity is going to be just the magnitude of the vector, V.

youdao

这里v表示速度的大小。

This is the magnitude of that v.

youdao

若想知道f撇的大小，撇等于f乘以1，then，f，prime，equals，f，times，one,加上,乘以cosθ

If now we want to know what f prime is, f v/c plus v over c times the cosine of theta.

youdao

Whenever you see a particle moving in a circle, even if it's at a constant speed, it has an acceleration, v square over r directed towards the center.

只要看到质点做圆周运动,即使是匀速圆周运动,也存在一个加速度,大小为 v^2 / r,方向指向圆心

耶鲁公开课 - 基础物理课程节选

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

耶鲁公开课 - 基础物理课程节选

The size of that is v^2 over R.

它的大小是 v^2 / R

耶鲁公开课 - 基础物理课程节选