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如果真的有超能力:飞行 – 译学馆
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如果真的有超能力:飞行

If superpowers were real: Flight - Joy Lin

如果人类能
If humans could fly,
不利用工具和器械飞行
without tools and machines,
你觉得我们最快能有多快?
how fast do you think we would go?
截止2012年 短距离冲刺
As of 2012, the world record
最快速度的世界纪录
for fastest short-distance sprint speed
大约每小时27英里
is roughly 27 miles per hour.
跑步速度取决于奔跑者的腿
Running speed depends on how much force
用了多少力量
is exerted by the runner’s legs,
根据牛顿第二运动定律
and according to Newton’s Second Law of Motion,
力是质量和速度的乘积
force is the product of mass times acceleration.
牛顿第三定律说明
And Newton’s Third Law states
每种运动
that for every action,
都会有一个相等的反作用力
there is an equal and opposite reaction.
这就意味着跑步需要
So, that means running requires
有地面提供阻力
having a ground to push off from,
地面反向推动奔跑者的脚
and the ground pushes back against the runner’s foot.
因此飞行实际可能
So, flying would actually be
和游泳更相似
more similar to swimming.
迈克尔·菲尔普斯是水中最快的人类
Michael Phelps is currently the fastest human in water
也是至今得奖最多的奥运会选手
and the most decorated Olympian of all time.
猜猜他能游多快?
Guess how fast he swims?
答案可能会让你惊讶
The answer may surprise you.
他的最快记录
His fastest recorded speed is
不到每小时5英里
less than 5 miles per hour.
一个在路上跑的小孩能很容易地超过
A child on the ground can easily outrun
水中游泳的迈克尔·菲尔普斯
Michael Phelps in water,
但这是为什么呢?
but why is that?
让我们回到牛顿的第三运动定律
Well, let’s go back to Newton’s Third Law of Motion.
当跑步时 我们靠用脚
When we run, we move forward
推向地面往前进
by pushing against the ground with our feet
地面也会有反作用力
and the ground pushes back,
推动我们向前
propelling us forward.
地面是硬的
The ground is solid.
从定义看 这意味着粒子
By definition, it means the particles
本质上就受困于地面
are essentially locked into place
粒子必须往回推 而不能乱窜
and must push back instead of getting out of the way,
但水是液体 可以随意流动
but water is liquid and flows easily.
当我们移动四肢
When we move our limbs
反推向水时
to push back against the water,
一部分水分子
a part of the water molecules
就可以从其它水分子中间滑过
can just slide past one another
而不是反推回来
instead of pushing back.
现在 我们来想想飞行
Now, let’s think about flying.
空气有更多能让分子
Air has a lot more free space
自由穿梭的空间
for particles to move past one another,
因此我们会浪费甚至更多能量
so even more of our energy would be wasted.
为了前进 我们需要
We would need to push a lot of air backwards
向后推动很多空气
in order to move forward.
宇航员在航天飞机上移动
Astronauts move around in shuttles
处于零重力的外太空
in zero gravity when they’re in outer space
他们要靠抓住天花板上和地上
by pulling on handles installed on the ceiling walls
装的把手移动
and floors of the shuttle.
现在 想象一下你拥有了漂浮的能力
Now, imagine you were given the ability to float.
你会如何在街道上穿行
How would you move around in the middle of the street?
你其实没办法依靠在空气中
Well, you wouldn’t get very far
游泳走太远 对吗?
by swimming in air, would you?
不 我认为不行
Nah, I don’t think so!
现在 再假设你有漂浮的能力
Now, assuming you were granted the ability to float
也有了可以有效移动的速度
and the speed to move around efficiently,
我们来讨论一下你飞行的高度
let’s discuss the height of your flight.
根据理想气体定律
According to the Ideal Gas Law,
PV=nRT
PV=nRT
压力和温度正相关
pressure and temperature has a positive correlation,
表示他们同增或同减
meaning they increase and decrease together.
这是因为当气体的体积扩大
This is because the air expands in volume
压力降低
with less pressure,
分子就有更多活动空间
so the molecules have more room to wander around
不会互相碰撞产生热量
without colliding into each other and creating heat.
由于大气压力在高海拔
Since the atmospheric pressure is a lot lower
会低很多
in high altitudes,
高空会变得非常寒冷
it would be freezing cold
如果你在云端飞行
if you were flying above the clouds.
你需要裹紧自己
You’d need to wrap yourself up
来维持你的体温
to keep your core body temperature
在95华氏度以上
above 95 degrees Fahrenheit,
否则你会开始剧烈颤抖
otherwise you’d start shivering violently,
意识也开始逐渐模糊
gradually becoming mentally confused
最终从空中掉落
and eventually drop out of the sky
因为温度过低时
due to loss of muscle control
你会失去对肌肉的控制
from hypothermia!
那么 理想气体定律表明
Now, the Ideal Gas Law implies
当压力降低时
that as the pressure decreases,
气体体积增加
gas volume increases.
因此 如果你径直向上飞的太快
So, if you were to fly straight up too quickly,
你体内的惰性气体就会迅速膨胀
the inert gas in your body would rapidly expand
就像汽水被摇晃后会嘶嘶冒气一样
the way soda fizzes up when shaken.
这种现象叫“减压症”
The phenomenon is called “the bends,”
压力降低引起的疾病
decompression sickness,
或者叫“潜水员症”
or “divers disease”
因为深海水肺潜水员上浮过快时
since deep sea scuba divers experience this
也会经历这个
when they come up too quickly.
这会导致痛楚
This results in pain,
麻痹
paralysis,
甚至死亡
or death,
取决于你血液中的气泡有多少
depending on how foamy your blood becomes.
好吧 假设你想仅仅
Okay, well, let’s say you want to fly
飞离地面几米
just a few meters above the ground
这样你仍然可以看到路标
where you can still see the road signs
也能容易地呼吸氧气
and breath oxygen with ease.
你仍需要护目镜和头盔
You’ll still need goggles and a helmet
保护你不撞到飞鸟
to protect you from birds,
昆虫
insects,
街道标志
street signs,
电线
electrical wires,
和其他飞行的人
and other flying humans,
包括飞行警察
including flying cops
小伙子 如果你不遵守飞行规则
ready to hand you a ticket
他们随时都会给你开一张罚单
if you don’t follow the flying rules, buddy.
记住 如果你在半空中发生事故
Now remember, if you have a collision mid-air
撞到失去意识
that knocks you unconscious,
你将会经历自由落体
you would experience free fall
直到你撞到地面
until you hit the ground.
没有了社会或物理定律
Without society or the laws of physics,
飞行会是一个特别棒的能力
flying would be a totally awesome ability to have.
但是 即使我们仅仅能在离地面
But, even if we could all just float around
几英尺的地方漂浮
a few feet above the ground
只能像蜗牛一样缓慢移动
and only moving at a snail’s pace,
我告诉你 这仍然是我想要的酷酷的能力
I’m telling you, it’s still a cool ability that I’d want,
你不觉得吗?
wouldn’t you?
是啊 我也这么觉得
Yeah, I thought so.
那么 下一堂你想探索的
Now, which superpower physics lesson
超能力物理课是什么?
will you explore next?
改变身体外形和成分
Shifting body size and content,
超高速
super speed,
飞行
flight,
超级力量
super strength,
永生
immortality,
或者隐身
and invisibility.

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视频概述

人真的有可能飞行吗? 让科学道理告诉你 其实飞行比我们想象中困难

听录译者

收集自网络

翻译译者

可可天使

审核员

审核团1024

视频来源

https://www.youtube.com/watch?v=0GDYCxQYbjg

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