Are the lines perpendicular to each other?
这些直线相互垂直吗？
What she's going to do is to start loading up the electrons, and you see this wand here move slowly, and start become perpendicular.
她要做的是开始加载电子，你可以看到这个棒子移动得很慢，并开始变得垂直了。
When a surface is perpendicular to the rays, their intensity is at its maximum.
当表面与射线垂直时，射线的强度最大。
一个与半径垂直的矢量。
So, the gradient is perpendicular.
所以，梯度向量是垂直的。
So, it's perpendicular to my curve.
它垂直于曲线。
Well, it means that OP and a are perpendicular.
就像前面说过的，这就是说op和A互相垂直。
And it will still be perpendicular to the curves.
它还是垂直于那些曲线。
This was evident from the perpendicular wrinkles.
这可以从那些垂直的折皱上看出来。
The gradient vector would be going perpendicular to the level.
梯度向量应该垂直于等值线。
In other words, it's perpendicular to the plane of the two vectors.
换句话说，它垂直于，两个向量所处的平面。
Then it becomes zero when I perpendicular, and then it becomes negative.
当垂直时，它变到，然后它变为负数。
And so the liquid will say "I'm going to be perpendicular to gravity."
此时液体会说，“我要与重力相垂直。”
It more or less goes perpendicular with the fault rupture of the earthquake.
海啸的行进方向与地震断层破裂带通常会相互垂直。
That means that the gradient of f is perpendicular to the level set of g.
也就是说f的梯度向量,应该与g的水平集垂直。
You have two choices: it's either coming at you perpendicular into the blackboard.
你们有两种选择：，垂直于你们自己，垂直于黑板。
v So -- So if the gradient vector is perpendicular to v OK, that's a good start.
所以梯度向量垂直于,很好，这是一个很好的开始。
Being perpendicular to the surface means that you are perpendicular to its tangent plane.
垂直于曲面也意味着垂直于它的切平面，垂直于曲面也意味着垂直于它的切平面。
The directional derivative in a direction that's perpendicular to the gradient is basically zero.
垂直于梯度的方向上,方向导数为零。
Now, if it's perpendicular to the plane, then in that case, it's perpendicular to the blackboard.
如果它垂直于这个平面，在那个例子里，它垂直于黑板。
And suppose I'm rotating it about an axis perpendicular to the blackboard through that point.
假设我将其绕着，通过这点垂直于黑板，的轴旋转。
Of course, we always split it into perpendicular directions because of the way that we analyze this.
当然，我们把它分为，垂直方向，就像，我们分析的那样。
OK, so now if we have a dot product that's zero, that tells us that these two guys are perpendicular.
所以我们现在有了一个点积为，这告诉我们两者是垂直的。
Why is that? Well, let's say that we know how to find a vector that's perpendicular to our plane.
为啥呢？呃，就是说，我们知道，怎么画垂直于这个平面的向量。
On a snowboard, the torso's natural position is more or less perpendicular to the direction of motion.
在单板上，人的躯干大致和运动方向垂直，十分自然。
Well, we've learned how to detect whether two vectors are perpendicular to each other using dot product.
呃，我们学过怎么用点乘,来判断两个向量是否垂直。
Consider a ball that is spinning about an axis perpendicular to the flow of air across it (see left).
观察一个旋转轴与空气流动方向垂直的足球(见上图)。
Does the gradient vector, why is the gradient vector perpendicular in one direction rather than the other?
梯度向量的垂直方向，为什么是这样而不是另外一个方向？
Does the gradient vector, why is the gradient vector perpendicular in one direction rather than the other?
梯度向量的垂直方向，为什么是这样而不是另外一个方向？
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