独木船的加速度方向如何？
因此我决定，在此处改变正方向，加速度方向就始终为正了，符号变了。
So the moment that I decide to define this the plus direction will also come out to be the same sign as this one so I flip the signs there.
研究表明，追逃双方机器人的控制作用使得彼此的加速度方向一致时，双方都取得最优控制策略，同时也证明了微分对策方法在处理碰撞问题时的有效性。
The research indicates that the controlling strategy is optimal when they have the same acceleration direction, and the differential games are efficient in dealing with collision problem.
前提要求就是，具有向心加速度，朝这个方向，向心力的作用。
There is a requirement that there is a centripetal acceleration, which is in this direction, a centripetal.
我们已经推导出了加速度,是这个方向。
We know that the acceleration is in this direction. We derived that.
这意味着如果我们在这点观察运动的轨迹，它的加速度是指向这个方向的。
So, what that means is that if I look at my trajectory at this point, that the acceleration vector is pointing in that direction.
在这个方向需要有一个加速度，故重量会增加。
There will be weight increase so there is here an acceleration upwards.
这一也十分重要-，加速度与力方向相同。
That's also important — the acceleration is in the direction of the force.
在y方向几乎,没有加速度。
但请看加速度，却是+2，方向是这样的。
But there is the acceleration which is plus two in this direction.
所以速度的符号,和平均加速度的符号,这二者都取决于,这里x正方向,是如何定义的,和0点的选取没有关系。
So the signs in the velocity and the signs in average acceleration depend crucially on how I have defined my increasing value of x not where I choose my zero points.
前代nano利用加速度计来在你旋转设备时自动调整屏幕方向。
The previous nano used the accelerometer to automatically reorient the screen when you rotated the device.
加速度在这个方向上，我规定它为正方向“，这个为负方向。”
Acceleration is in this direction and I will call this "plus" and I will call this "minus."
关于力和加速度，我们可以写出以下公式(现在我们只要看纵轴方向就可以了)。
In terms of forces and acceleration, I can write (now just in the y-direction).
我确实还得收集更多的数据，看看点击后的速度是不是恒定的，但让我先看看点击之前竖直方向的加速度吧。
Yes -i need more data to really see if the final velocity is constant. However, let me look at the distributions of vertical accelerations before the tap.
我确实还得收集更多的数据，看看点击后的速度是不是恒定的，但让我先看看点击之前竖直方向的加速度吧。
Yes - I need more data to really see if the final velocity is constant. However, let me look at the distributions of vertical accelerations before the tap.
我的意思是加速度只沿这一个方向，它只要对速率求导即可。
I mean, acceleration is also going to be along the line, and it's going to has to do with the derivative of speed.
物体运动，并向上加速度，因为摩擦力方向斜上，值为这个。
It is moving, so sure, it's going to be accelerated so the frictional force is in this direction, has this value.
在y方向上没有加速度，只有在x方向上移动时才有，这就是分解它的原因。
There is no acceleration in the y direction, only in x direction when it starts moving, and that's why we split it.
所以就会产生向心加速度，在这个方向上，这些微粒会说，“啊哈，重力是这个方向的。”
Therefore, there is now a centripetal acceleration in this direction, and so the particles now say "Aha! Gravity is in this direction."
因此加速度必然,是在x正方向-,这里是正好，必然如此。
Therefore the acceleration since I call - that the "plus x direction"-- that was my plus sign-- must come out plus.
那y方向上,0时刻的加速度是多少？
既然在y方向上,没有加速度，法向力也等于mgcosθ
Since there is no acceleration in the y direction, the normal force must be also mg cosine theta.
通过对实型铸造干砂振动填充紧实中的振动方向、维数、频率、加速度及干砂种类等诸多影响要素的测定实验，研究了实型铸造振动紧实干砂的性能。
Vibratory compactability of dry sand in full mold foundry has been researched by experiments on effective factors such as vibratory direction, dimensions, frequency, acceleration and dry sand sorts.
方向上如果没有加速度，There，is，no，acceleration，in，the，x，direction,但是你最好相信,方向是有加速度的。，in，the，y，direction。,所以当我们处理y的方程时,需要考虑到加速度-,与处理x方向完全不同。
x but you better believe that there is one y So only when we deal with the y equations - does this acceleration come in-- not at all when we deal with the x direction.
目的证实LEJ - 1型全方向m -型超声心动图测量心室壁运动速度与加速度的临床意义。
Objective To confirm clinical significance of wall motion velocity and acceleration measured by LEJ-1 omni-directional M-mode echocardiography (OME).
你知道加速度意味着，不是改变速度就是改变方向。
And, you know acceleration means either change of speed or change of direction.
讨论了加速度与受力、运动方向之间的关系。
The relationship among acceleration, force and the motion direction is discussed.
此时，其运动状态将发生改变，表现为速度、加速度、运动方向的改变。
Now, their motion states will change, such as their motion velocities, accelerations and motion directions.
性能指标的提高一直是微机械加速度计领域的重要研究方向。
The improvement of performance has been the important research direction in micromachined accelerometers since its appearance.
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