The car real driving cycle usually is a velocity-time curve based on times.
乘用车实际行驶工况通常可表示为基于时间的一段时间-速度曲线。
The start-up time of the mill is calculated to be 7.94~ 10.32 s by a linear formulation for the rotating velocity-time relationship to be 7.94~ 10.32 s.
采用线性关系表示异步电动机启动阶段转速与时间的关系，计算出立式行星磨的启动时间范围为7.94~10.32s。
So what matters is this changing velocity and the impact time.
因此速度改变量和撞击时间,才是重要的。
So notice that the acceleration is constant in time, is not changing but the velocity is changing.
请注意此处的加速度，是一个常数，不随时间变化而变化，不过速度是变化的。
This report gives you a good indication of velocity over time.
该报告给您了一个很好的随着时间的速度的指示。
We need to know the velocity of the neutron which we can talk about with energy and we need to know the time, when did this take place?
我们需要知道中子的速率，我们能够用能量来谈论它，我们需要知道时间，它什么时候会发生？
So if I strobe this apple while it was falling I would see the separation, when it strobes to increase with time, because the velocity goes up with time.
如果用频闪相机拍摄，苹果下落的过程，可以看到频闪的间隔，苹果的距离，随着时间不断变大，因为速度随着时间而变大。
Also that velocity, v, in that equation number five will also change with time because it's an elliptical orbit.
同样的，第五个方程序，中的速度同样，会随时间改变，因为这是椭圆形轨道。
Concretely, if you imagine that you are putting something in there, you know, if you are in a velocity field the curl will tell you how fast your guy is spinning at a given time.
具体来讲，想象一下，你要放东西在那里，如果是在一速度场内，旋度告诉你，在给定的时间他旋转的速度。
And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.
根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。
So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.
如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。
The use of this security architecture significantly enhances the combatant commander's ability to use precise positioning, velocity and time, in all environments.
这个安全架构的使用大大提高了作战指挥的能力，可在所有环境下快速及时的精确定位。
So, the velocity vector is the derivative of a position vector with respect to time.
速度向量，是位置向量关于时间的导数。
That means when I drop an apple — - and I'm going to drop another one today — that the velocity increases with time.
这也就是说，当我让苹果落下时……，…今天又得摔一个苹果-，它的速度会渐渐增加。
And we have a string here and the string is attached to this ball and the whole thing is going around and so at one moment in time this has a velocity, like so.
这是绳子，绳子的一端连着小球，小球与转盘一起转动，一段时间后，小球得到这样一个速度。
If the speed doesn't change, then the velocity, of course, does change because the direction changes all the time, but the speed does not.
若速率恒定，那么速度当然会变化，因为方向时刻是变化着的，但是速率没变。
We want to go to the acceleration at any moment in time just the way we did that with velocity.
关于任意时刻的，加速度，和讲速度的时候一样。
The vertical velocity changes as a function of time and height above ground for the deep warm cloud.
在深厚暖云中，垂直速度随时间和高度而变化。
If you were thinking of a velocity field, that would measure how much fluid is passing through the curve in unit time.
想象一个速度场，它能够度量，单位时间内流体的量。
This velocity will give me a certain time, and this velocity will give me a certain time.
速度会给我一段时间，速度会给我一段时间。
The Global Positioning System enables properly equipped users to determine precise time and velocity and worldwide latitude, longitude and altitude to within a few meters.
GPS允许持有对应设备的用户来确定精确的时间、速度、经纬度以及海拔，而误差只有几米。
In his blog, Misuse of velocity in Agile projects, posted last year Mark Levison defines velocity as the amount of work completed by the team divided by the time taken to complete it.
MarkLevison在他去年的博客文章“敏捷项目中开发速度的误用”中，他定义了开发速度是团队完成的工作量除以完成时间。
And now you will understand how we define the instantaneous velocity at time t which is different from an average velocity between two time intervals.
现在明白了吗，t时刻，的瞬时速度是怎样定义的，与两时刻间的平均速度相比，瞬时速度并不一样。
Now, I would think that it is reasonable to ask the following question: What is the average velocity, for instance, between time zero and time four?
现在，我认为,提出如下问题,是十分合理的：,比如说，平均速度是多少，在0到4秒之间？
We define average velocity as the position at time four seconds minus the position at time zero, 4 divided by four.
我们定义平均速度，是四秒时的位置，减去0秒时的位置，除以。
I now would like to write down, in most general form the equation for the position and the velocity as a function of time for a one-dimensional motion whereby the acceleration is constant.
我来把更一般的形式，写出来吧，在一维空间中，位置和速度，作为时间函数的，一般形式，这里的加速度是一个常数。
By the time he passed four thousand feet he had reached terminal velocity, the wind was a solid beating wall of sound against which he could move no faster.
他穿越四千英尺的高度时，已经达到极速，呼啸着的海风就像一堵坚实的墙，拦在前面，使他无法以更快的速度前进。
But to get the planet's mass, astronomers normally need to follow up with time-consuming radial velocity observations at some of the planet's biggest telescopes.
但测量行星的质量，天文学家通常还需要使用地球上最大的天文望远镜，来测算径向速度的耗时。
We measure the distance and we measure the time, and we take the ratio to get the velocity, just as you learned to do in high school.
我们测量距离，测量时间，然后两者相比得到速 度，就像你高中学到的那样。
You could say the position vector at another time, or at any time, but in fact, what's also true is that the velocity vector is in the plane.
你可以说，位置矢量在另一个时间或在任何时间，无论如何，位置矢量始终在这个平面上。
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