The elevator whisks me with terminal velocity to the twentieth floor.

电梯以终端速度急速将我送到20楼。

Different objects have different terminal velocities, depending on their surface area, their mass, things like that.

不同的物体有不同的最终速度，这取决于它们的表面积，它们的质量，诸如此类。

An object floating in a wind tunnel is experiencing the same net forces as an object falling at terminal velocity.

漂浮在风洞中的物体正在承受与以最终速度下落的物体相同的净力。

That's around 10 times the terminal velocity of rain.

这大约 是雨的终端速度的 10 倍。

For most of its journey, it's moving at a constant speed known as its terminal velocity.

在其大部分旅程中，它都以恒定速度移动，称为终端速度。

We've been able to build structures that fall in a more stable trajectory at slower terminal velocities than equivalent seeds.

我们已经能够构建以比等效种子更慢的终端速度落入更稳定轨迹的结构。

Every object has its own terminal velocity, the maximum speed it will reach in free fall through still air.

每个物体都有自己的终端速度，即它在静止空气中自由落体时所能达到的最大速度。

After just 40 seconds of free fall, he reached a terminal velocity over 1300 kilometers per hour.

自由落体仅 40 秒后，他的终端速度就达到每小时 1300 公里以上。

That's because hail can reach terminal velocities of over 200 kilometers per hour.

这是因为冰雹的最终速度可达每小时 200 公里以上。

So the bigger the hailstone, the faster its terminal velocity.

因此冰雹越大，其终端速度越快。

Pennies reach terminal velocity after falling only around 15 meters.

便士仅在 15 米左右下落后就达到了最终速度。

And that's why the hammer keeps speeding up while the feather reaches terminal velocity early and just stays at that speed.

这就是为什么锤子不断加速，而羽毛提前达到终端速度并保持在该速度。

This tumbling behavior means pennies don't actually have a single terminal velocity.

这种翻滚行为意味着便士实际上没有单一的终端速度。

A penny actually has two terminal velocities and it oscillates between them.

- 一分钱实际上有两个终端速度，并且它在它们之间振荡。

(both laughing) But something more aerodynamic would have a higher terminal velocity.

（两人都笑了）但是更符合空气动力学的东西会有更高的终端速度。

Terminal velocity is reached when the force of gravity pulling an object down is equal to the force of air resistance pushing it up.

当向下拉物体的重力等于将物体向上推的空气阻力时，就达到了终端速度。

But why is its terminal velocity so much higher even though ice itself is slightly less dense than liquid water?

但是，为什么尽管冰本身的密度比液态水稍低，但它的最终速度却高得多呢？

Because of air drag, the terminal velocity of a penny is between 30 to 50 miles per hour, or maybe even less if there's wind.

由于空气阻力， 一分钱的终端速度为每小时 30 到 50 英里，如果有风的话， 速度可能会更低。

So the reason pennies aren't dangerous is because their terminal velocity is at most about 80 kilometers per hour.

因此，便士之所以不危险，是因为它们的最终速度最多约为每小时 80 公里。

And the larger raindrops have a higher weight to surface area ratio, and so they have a higher terminal velocity, so they will be falling faster.

较大的雨滴具有更高的重量与表面积比，因此它们具有更高的终端速度，因此它们会落得更快。