If superpowers were real: Super speed - Joy Lin

Kada bi supermoći bile stvarne: nadljudska brzina - Džoj Lin (Joy Lin)

Prevodilac: Mile Živković Lektor: Anja Saric

Some superheros can move faster than the wind.

Neki superheroji mogu da se kreću brže od vetra.

The men in Apollo 10 reached

Ljudi u Apolu 10 dostigli su

a record-breaking speed

rekordnu brzinu

of around 25,000 miles per hour

od oko 40 000 kilometara na čas

when the shuttle re-entered

kada se šatl vratio

the Earth's atmosphere in 1969.

u Zemljinu atmosferu 1969.

Wouldn't we save a lot of time

Zar ne bismo uštedeli puno vremena

to be able to move that fast?

kada bismo mogli da se krećemo tako brzo?

But what's the catch?

Ali u čemu je caka?

Air is not empty.

Vazduh nije prazan.

Elements like oxygen and nitrogen,

Elementi poput kiseonika i azota,

even countless dust particles,

čak i bezbrojne čestice prašine,

make up the air around us.

čine vazduh oko nas.

When we move past these things in the air,

Kada se krećemo pored ovih stvari u vazduhu,

we're rubbing against them

mi ih dodirujemo

and creating a lot of friction,

i stvaramo dosta trenja,

which results in heat.

što za posledicu ima toplotu.

Just like rubbing your hands together warms them up

Isto kao što zagrejete vaše dlanove kada ih trljate jedan o drugi

or rubbing two sticks together makes fire,

ili kada trljanje dva štapa stvori vatru,

the faster objects rub together,

što brže se predmeti trljaju,

the more heat is generated.

to se stvara više toplote.

So, if we're running at 25,000 miles per hour,

Ako bismo onda trčali brzinom od 40 000 kilometara na sat,

the heat from friction would burn our faces off.

toplota od trenja bi nam istopila lice.

Even if we somehow withstood the heat,

Čak i kada bismo nekako izdržali toplotu,

the sand and dirt in the air

pesak i prašina u vazduhu

would still scrape us up

bi nam opet naneli

with millions of tiny cuts

milione sićušnih posekotina

all happening at the same time.

u isto vreme.

Da li ste ikada videli prednji branik ili rešetku od hladnjaka na kamionu?

Ever seen the front bumper or grill of a truck?

What do you think all the birds and bugs would do

Šta mislite, šta bi uradile sve ptice i insekti

to your open eyes or exposed skin?

vašim otvorenim očima ili izloženoj koži?

Okay, so you'll wear a mask

U redu, nosićete masku

to avoid destroying your face.

da izbegnete uništenje lica.

But what about people in buildings

Ali šta je sa ljudima u zgradama

between you and your destination?

između vas i vašeg odredišta?

It takes us approximately one-fifth of a second

Potrebna nam je otprilike petina sekunde

to react to what we see.

da reagujemo na ono što vidimo.

By the time we see what is ahead of us

Do onog trenutka kad vidimo šta je ispred

and react to it -

i na to reagujemo -

time times velocity equals distance

vreme X brzina = udaljenost

equals one-fifth of a second

= jednoj petini sekunde

times 25,000 miles per hour

X 40 000 kilometara na čas

equals 1.4 miles

= 2,2 kilometra -

- we would have gone past it

prošli bismo to

or through it by over a mile.

ili kroz to, za preko kilometar.

We're either going to kill ourselves

Ili ćemo se ubiti tako što ćemo proći

by crashing into the nearest wall at super speed

kroz najbliži zid pri nadljudskoj brzini,

or, worse, if we're indestructible,

ili još gore, ako smo neuništivi,

we've essentially turned our bodies into missiles

zapravo smo svoja tela pretvorili u rakete

that destroy everything in our path.

koje uništavaju sve ispred sebe.

So, long distance travel at 25,000 miles per hour

Tako bismo od dužih putovanja pri 40 000 kilometara na čas

would leave us burning up,

potpuno izgoreli, bili bismo

covered in bugs,

prekriveni insektima

and leaves no time to react.

i ne bismo imali vremena za reagovanje.

What about short bursts

A šta sa kratkim trkovima

to a location we can see

do nekog mesta

with no obstacles in between?

gde ne vidimo nijednu prepreku?

Okay, let's say a bullet

Recimo da će metak pogoditi

is about to hit a beautiful damsel in distress.

predivnu damu u nevolji.

So, our hero swoops in at super speed,

Naš heroj uleće pri nadljudskoj brzini,

grabs her,

hvata je

and carries her to safety.

i nosi na bezbedno.

That sounds very romantic,

To zvuči veoma romantično,

but, in reality, that girl will probably suffer

ali bi ta dama zapravo verovatno istrpela

more damage from the hero than the bullet

više štete od heroja nego od metka

if he moved her at super speed.

kada bi je pomerio pri nadljudskoj brzini.

Newton's First Law of Motion deals with inertia,

Njutnov prvi zakon kretanja tiče se inercije,

which is the resistance to a change

što je otpor na promenu

in its state of motion.

u njenom stanju kretanja.

So, an object will continue moving

Tako će objekat nastaviti da se kreće

or staying at the same place

ili će ostati na istom mestu

unless something changes it.

ukoliko ga nešto ne promeni.

Acceleration is the rate the velocity changes over time.

Ubrzanje je stopa po kojoj se brzina menja tokom vremena.

When the girl at rest,

Kada devojka miruje,

velocity equals zero miles per hour,

brzina je nula kilometara na čas,

begins accelerating to reach the speed within seconds,

počinje da ubrzava da dostigne brzinu u nekoliko sekundi,

velocity increases rapidly

brzina se naglo uvećava

to 25,000 miles per hour,

na 40 000 kilometara na čas,

her brain would crash into the side of her skull.

njen mozak bi udario u lobanju.

And, when she stops suddenly,

A kada bi naglo stala,

velocity decreases rapidly back to zero miles per hour,

brzina se naglo smanjuje do nula kilometara na čas,

her brain would crash into the other side of her skull,

i njen mozak bi udario u drugu stranu lobanje

turning her brain into mush.

i pretvorio se u kašu.

The brain is too fragile to handle the sudden movement.

Mozak je suviše osetljiv da se izbori s naglim kretanjem.

So is every part of her body, for that matter.

Uostalom, kao i svaki deo njenog tela.

Remember, it's not the speed that causes the damage

Zapamtite, nije brzina ta koja prouzrokuje štetu,

because the astronauts survived Apollo 10,

jer su astronauti preživeli Apolo 10,

it's the acceleration

već ubrzanje

or sudden stop

ili naglo zaustavljanje

that causes our internal organs

čine da naši unutrašnji organi

to crash into the front of our bodies

udare u prednji deo naših tela

kao što bismo se pomerili napred u autobusu

the way we move forward in a bus

when the driver slams on the brakes.

kada vozač nagazi na kočnicu.

What the hero did to the girl

Ono što je heroj učinio devojci

is mathematically the same as running her over

je matematički isto kao da ju je pregazio

with a space shuttle at maximum speed.

svemirskim brodom pri punoj brzini.

She probably died instantly at the point of impact.

Verovatno je umrla odmah po trenutku udarca.

He's going to owe this poor girl's family an apology

Porodici ove jedne devojke će dugovati izvinjenje

and a big fat compensation check.

i ogroman ček za nadoknadu patnje.

Oh, and possibly face jail time.

Da, i verovatno će ići u zatvor.

Doctors have to carry liability insurance

Doktori moraju da imaju osiguranje od odgovornosti

just in case they make a mistake and hurt their patients.

za slučaj da pogreše i povrede svoje pacijente.

Baš se pitam koliko bi koštala polisa osiguranja za superheroje.

I wonder how much superhero insurance policy would cost.

Now, which superpower physics lesson

Sada, koju ćete lekciju o supermoćima iz fizike

will you explore next?

istražiti nakon ove?

Shifting body size and content,

Menjanje veličine i sadržaja tela,

super speed,

superbrzina,

flight,

let,

super strength,

nadljudska snaga,

immortality,

besmrtnost,

and

ili

invisibility.

nevidljivost.