I wanted to know how many milliseconds is the touchdown delayed because of the air drag.
我想知道，因为空气阻力，延迟多久以后落地。
That's not bad, so this takes the air drag into account, and it is not even an approximation.
并不糟糕，算上了空气阻力，这甚至不是一个近似值。
In the absence of any air drag, I would get a nice parabola which will be completely symmetric.
在没有阻力的情况下，会得到一条抛物线，非常均衡的。
If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.
如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。
And so to a reasonable approximation, you will get an elastic collision, but, of course, there's always air drag.
据合理估计，你得到一个弹性碰撞，但空气阻力总存在。
Of course, then they open the parachute and then the air drag increases enormously and then they slow down even further.
当然，当他们打开，降落伞，空气阻力剧增，他们下降的更缓慢。
Because of its dense nature, a large mass can be formed into a small space, minimizing air drag and reducing energy loss.
由于其密集性质，一个大集体，可形成一个小空间，减少空气阻力，减少能源损耗。
If there were no air drag — remember we dropped - an apple early on from three meters — it will hit the floor at about 780 milliseconds.
如果没有空气阻力-，记得早些时候，我们从3m处扔苹果-，在780毫秒以后，会掉到地上。
Thesis shows that the insulator surface pollution process has matter with Brownian motion, the air drag force, turbulent diffusion, gravity.
论文研究表明，绝缘子表面积污过程与布朗运动、气流曳力、湍流扩散、重力自沉降有关。
Automotive frontal area is projected area of automobile driving direction, which is necessary parameter of measuring automotive air drag coefficient.
汽车迎风面积是指汽车在行驶方向的投影面积，汽车迎风面积是求汽车空气阻力系数的必需参数。
However, if you could jump up way - near the top of the atmosphere — - where the air drag is negligible — then you would be weightless for quite some time.
而且由于空气阻力，不可能完全失重-，不过如果十分接近大气层顶端-，那么空气阻力便可以忽略。
So you see that it's even a pebble you wouldn't expect to be... to have a very large effect on air drag, it is huge, provided that you throw it from a high building.
所以即使一块卵石,也不要预期。,对空气阻力有很大影响，如果把一个很大的,东西从很高的楼上扔下。
Of course, in reality, the baseball player knows better They give effect to the ball, they deal with air drag they spin the ball, and then these equations are not valid.
当然，还是棒球选手更了解现实情况,他们用特殊的抛球方式减小空气阻力,他们使球在飞行时带自转，这些公式就无法应用了。
One weak wind conditions, surface pollution mainly related to Brownian motion and turbulent diffusion, under strong wind mainly associated with the air drag force.
其中弱风环境下，表面积污主要与布朗运动和湍流扩散相关，强风环境下主要与气流曳力相关。
If you take a pebble with a radius of about one centimeter and you throw it off a high building, it will reach a speed which will not exceed 75 miles per hour because of the air drag.
如果拿一个半径是，1厘米的小卵石，从高楼上扔下去，它的速度因为空气阻力，不过超过每小时75英里。
The analysis of aerodynamic force data shows that differ front shape is very important to aerodynamic force. For example, coach model air drag coefficient can be lowed to 0.5759 from 0.7509.
试验数据分析结果表明，不同客车前部造型对气动力影响非常显著，如通过改善造型可使空气阻力系数由0.7509降为0.5759。
Drag is the force of air resistance pushing against a ball's motion and slowing it down, while lift is a force causing a ball to swerve off a straight path.
拉力是一种物体在空气中所受到的阻力，它能产生与球运行方向相反的作用力，减缓球的运行速度，而升力则是一种能使物体偏离直线运行轨迹的力。
Disrupted air, where the flow 'separates' from the body, creates turbulence which creates drag - which slows the car down.
与身体分隔的紊乱的空气产生涡流进而造成空气阻力，使得车速下降。
The aerofoil of a wing creates more lift than drag, but exactly how much depends on its design and the speed of the air passing over it.
飞机上的机翼制造升力超过阻力，但具体取决于机翼的设计和当时经过的空气流动速率。
The software can work out, for example, the exact rate at which a plane should rise into thinner air (to reduce drag) as fuel burn makes it lighter.
比如，它能够计算出飞机向最薄的云层（以减轻阻力）上升的准确率，以减轻飞机自身重量。
The flow of air over the surface of the ball was turbulent, which gave the ball a relatively low amount of drag.
球的表面流动的空气形成湍流，这使得球的阻力相对较低。
This, the researchers believe, is caused by the surface of the water smoothing out a vortex of air coming off the flying fish and reducing drag.
研究者相信，这源于水面平滑了飞鱼迎面的风涡，降低了阻力。
When the shape of a wing creates more lift from the air passing around it than it does drag (air resistance), an aircraft will fly.
当鱼鳍的形状通过流动的空气产生比其(空气)阻力更多的升力时，飞行物便能飞翔。
A: At highway speeds you are best off closing the Windows and sunroof, because opening them often causes enough drag to offset any savings from turning off the air conditioner.
答：当在高速公路上行驶时，你最好把车窗和天窗都关上，否则通常会带来相当大的阻力，抵消掉不开空调省下的油钱。
At altitude, the air pressure is lower, and so are aerodynamic effects such as drag and lift, ultimately causing balls to travel faster and straighter than they would at lower altitude.
由于地处高海拔地区，气压较低，因而作用在球上的阻力及升力所产生的空气动力效应也会发生相应反应，最终导致球在空中飞行速度比在低海拔地区快，飞行的路线也更直。
The forces on a spinning ball that is flying through the air are generally divided into two types: a lift force and a drag force.
空气中运行的旋转球的受力通常分为两种：升力和阻力。
Once the ice is dislodged, gravity or air-drag force such as on an airplane wing do the rest.
一旦接合部分被融化了，剩下的事情就可以交由重力或空气摩擦力(如在飞机的机翼上的空气摩擦力)来完成。
The disadvantage of leading-edge slats is that the air acceleration in the slot requires energy (it creates additional drag).
板条不利的领先优势是，在槽中的空气加速需要能量（它创造更多的阻力）。
In Johannesburg, the exact same shot would either fly over the crossbar or hit the wall, as the lower air density reduces both drag and the effect of spin.
在约翰内斯堡，完全相同的射击既可能比球门飞得高也可能撞到人墙，因为更低的空气密度既降低了拖曳力也降低了旋转效应。
In Johannesburg, the exact same shot would either fly over the crossbar or hit the wall, as the lower air density reduces both drag and the effect of spin.
在约翰内斯堡，完全相同的射击既可能比球门飞得高也可能撞到人墙，因为更低的空气密度既降低了拖曳力也降低了旋转效应。
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