Acceleration and velocity are both vectors.
加速度和速度都是矢量。
Acceleration to 60 mph takes a mere 5.7 seconds.
加速到每小时60英里仅用5.7秒。
The engine delivers instant acceleration whatever the revs.
不论转速如何，发动机都可以立即加速。
That change is the rapid acceleration of urbanization.
这种变化就是城市化的急剧加速。
We have come to expect an acceleration of music during car chases and creaky doors in horror films.
我们已经开始期待在汽车追逐时音乐的加速和恐怖电影中嘎吱作响的门。
I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.
我可以测量它了，因为我把它拉到了一厘米，我发现它对一个已知质量施加的加速度。
Do not confuse ever the tangential acceleration, which is along the circumference, with centripetal acceleration.
不要把沿圆周的切向加速度与向心加速度混淆。
There is now an acceleration in the rates at which they are becoming both cleverer and cheaper: an explosive combination.
现在，它们正在加速变得更聪明、更便宜：这是一个爆炸性的组合。
First, as they grow taller, big trees become thicker and less flexible: when winds blow across the surrounding cleared land, there is nothing to stop their acceleration.
首先，随着大树长高，它们变得越来越粗、越来越不灵活：当风吹过周围的空地时，没有什么可以阻挡它们加速。
Species extinction, deforestation, damming of rivers, occurrence of floods, the depletion of ozone, the degradation of ocean systems and many other areas are all experiencing acceleration.
物种灭绝、森林砍伐、河流筑坝、洪水、臭氧层损耗、海洋系统恶化和许多其他变化都在加速发生。
This is an acceleration on March, when revenue passenger kilometers increased 2.9%.
这是3月份的一个加速，付费旅客周转量增加了2.9%。
It's a very modest acceleration.
一个很小的加速度。
That is the instantaneous acceleration.
这也就是瞬时加速度。
We call it "centripetal acceleration."
我们称之为“向心加速度
What does that mean for the acceleration?
就加速度而言这意味着什么呢？
And, as it rotates, it USES acceleration.
随着它的旋转，就产生了加速度。
GPU acceleration and hardware compositing.
GPU加速和硬件合成。
We will discuss velocities and acceleration.
这节课主要讨论速度和加速度。
It means "hardware acceleration" for Web video.
对在线视频进行硬件加速。
That is 40 times the acceleration due to gravity.
大致是重力加速度的40倍。
That is only one-fifth of the gravitational acceleration.
仅为重力加速度的,五分之一。
It's a phenomenal acceleration, the simple vacuum cleaner.
仅仅一个普通吸尘器，就拥有如此了得的加速度。
Now let's talk about the acceleration aspect of optimization.
现在，让我们来谈谈优化的加速方面。
And we can calculate now what the centripetal acceleration is.
这样我们，就能求出向心加速度。
And angular acceleration is the derivative of angular velocity.
角加速度等于，角速度的导数。
So, that means the acceleration is parallel to the position.
这意味着加速度与位矢平行。
If the acceleration goes down, the period of oscillation goes up.
如果加速度减小，振荡周期变大。
If the acceleration goes down, the period of oscillation goes up.
如果加速度减小，振荡周期变大。
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