Thedon101
119172
3330
64
Feb 20, 2019 2:52 PM
Thedon101
119172
3330
64
TRDirty
We need a mythbusters reunion now
Haiddon
that's assumed to be the amount of energy required, but it would likely just char a hand shaped section, and leave the rest raw.
MakeMyOtherDay
Sounds like something that would be on XKCD - What if?
anitabieror6
that's a frozen chicken though right? what if its thawed?
ShouldersDeepInAHorse
Yes... if the chicken did not mind being blackened and pulverized instantly.
DrDantheMedicalman
Probably the genuine reaction
phlebus36
well look: logic would say your hand would cook faster being smaller: so good luck with that
nosoupforoldmen
THE FORCE YOU WOULD NEED TO SLAP IT AT WOULD DISINTEGRATE THE CHICKEN SO THERE'S NO POINT
SquidShadeyWadey
My father, Physicist with plenty of experience in thermodynamics and real nasty shit, No it will not
mrsnugglemuffins
I'm gonna ask my science teacher that and see how she reacts
LavChaos
I'm awaiting this response.
fsosaolea6
But is it true?
BrockEffingSamson
You'll make some lovely chicken paste all over the wall.
ThereIsntAnyCheeseInMyAss
You will break your hand.
HelloToe
FullPlateHero
We need Randall Munroe to break it down in the next edition of What If. Pretty sure it would involve at least a sonic boom.
Makerofroads
The problem with the calculation, is that the guy calculated heating the entire chicken (which is made up of different things) to 400 deg.
Taistelutenori
Schetchuan?
v
DarkwingDuc
Saskatchewan?
thorinsbeard
https://www.reddit.com/r/theydidthemath/comments/9ogy3o/request_how_hard_do_i_need_to_slap_a_chicken/
jeebz24
I think its technically correct, but the force would obliterate the chicken, no? You wouldn't get a nice cooked chicken, you'd get MUSH
rebel1996
Airplane windshield test with a chicken canon.
legalizeC4
This chicken will just explode. No time for it to be cooked. Just because you slap it at mach 4 doesn't mean inertia isn't a thing.
PikaChunin
Okay, what if you moved the chicken through the air fast enough at the right altitude and let the friction generate heat?
legalizeC4
Again the forces involved would come into play. Titanium has no problem with that. Flesh, maybe a little before it's turn apart.
Immisorator
Imagine someone attached testing this. At that speed, the chicken would cease to exist in a solid state. It may become a cooked liquid mush
TheNippleHunter
Still cooked tho
STINKPICKEL
youhavemail
Randy Johnson!
SamuraiChemist
Yes, but only if the chicken is a perfect sphere in a vacuum.
DorthLous
You're the closest to anything right. Most people seem to have missed your hand (rip) moving 4 times the speed of sound and not reaching.
MustardDuck
And also not break up at impact, which is.... a questionable assumption
legalizeC4
To what end though? Accelerating a ball of flesh and bone from 0 to mach 5 instantly. Can't think of anything organic that can take that.
RonanOReilly4
So thats 5996.335277 km per hour,
RonanOReilly4
99.93892 km per minute
RonanOReilly4
1.6656 km per second
RonanOReilly4
1665.6 meters per second
RonanOReilly4
which is about 5 times the speed of sound - mach 5 (?)
RonanOReilly4
you're not cooking anything - just making a splattered chicken (and hand)
madhatterzhat
Screw the physicists, someone get me an engineer and a jet engine.
GodsFoot
Yes?
ShouldersDeepInAHorse
I mean, they do throw chickens into jet engines to test them.
Imakestuffwithcnc
You rang
bananhammock
ImgursLibertarian
That analysis assumes fully adiabatic conditions. It's like a microcanonical ensemble.
PickleRickk91
And a god damn pencil sharpener! ...wait what
dunecat1337
Need a vacuum chamber.
soccerninja814
For every physicist saying that something is impossible, there is an engineer trying to prove them wrong.
Everfearful
Mathematicians and physicists build the toys engineers play with. And engineers do so love to break their toys...
yzark01
Na they just lay the ground work, an engineer's literal job is to take that theory and build something useful out of it
TheSpanishInquisitor
Incognito39
I just wanted to use it
BunnyBroohaa
Ghostwalkers
PreviousNameWasStalkable
I didn't. Care to elaborate?
TheSpanishInquisitor
https://www.reddit.com/r/theydidthemath/comments/9ogy3o/request_how_hard_do_i_need_to_slap_a_chicken
PreviousNameWasStalkable
Oh those amazing glorious bastards! Thank you :)
bobon123
As a Physicist, the most annoying mistake is to think that a cooked chicken is at 200°C. Has he never roasted a chicken?
TheGoudeAbides
If he’s in grad school, no.
pointastic
I'm disappointing by the lack of outrage over this aspect in most of these posts.
Othernate
but to get an internal temperature of 165 or whatever, the outside has to be hotter, right?
bobon123
Yes, that is the source of his mistake: he confused the fact you set the oven at 200°C with the temperature of the chicken.
Othernate
Huh, that makes a lot of sense. So if you're punching a chicken at mach 5, do you think it'll heat evenly?
DavidBrooker
It makes way more sense to consider adiabatic heating from the air than transfer of kinetic energy.
DavidBrooker
Or, I guess, adiabatic warming is more correct, since adiabatic itself implies no heating.
waitwasthatreal
Yeah, the assumption that all the kinetic energy is transferred to heat is completely wrong.
ElSephiroth
the chicken would probably end like the wasp in One Punch Man
DavidBrooker
Also yes. No momentum conservation gave them an indeterminate system.
Steffn
No, _adiabatic_ heating from the air doesn't make more sense.
DavidBrooker
Meaning the air is warmed adiabatically, not the chicken. Adiabatic heating dominates over viscous heating at even modest Mach numbers.
DavidBrooker
(unless you are upset that 'heating' is used to describe temperature change despite no heat transfer - then blame the English language)
Steffn
It's the adiabatic part, where would you set the system boundary?
DavidBrooker
Here I would follow a streamline far upstream to stagnation for adiabatic heating. Assuming a large flow rate (reasonable at high speed) 1/2
DavidBrooker
I would then assume that the stagnation streamline is isothermal along the boundary with the chicken (less reasonable). 2/2
BrazilianThunderPanda
M4K3R
https://media.giphy.com/media/9WXyFIDv2PyBq/giphy.gif
Rantaf
Yes, very good.
Othernate
Is it really, though? At best it's an anti-joke.
Rixius44
No u
dgregs
What I don’t understand is how there was so much estimation used, yet the answer is given to the hundredths place.
aboynamedsam
ElSephiroth
with estimations it is closer to that value than to a round up. I guess.
MikeTheScientist
Everything in the world can be somewhat estimated and still happen almost 100% of the time...
TheJudgeHasItBackwards
Assumptions are different than estimations, and can be precise, but the number of sig figs was silly for sure
dgregs
Someone needs to review their sig figs.
goflyblind
at least there were units.
Yesisaidthat
Fresh out of those, but I do have fig Newtons.
Virunuss
Wasn't it more that a lot of -assumptions- were made, not so much estimations?
HerrBisch
Didn't they say something like "let's assume you need to heat a chicken to 400 degrees to cook it"?
Crabshroom
Hopefully not celsius.
dreikommavierzehn
That's an assumption in this context, not an estimation. He's setting up the boundaries for the following calculation.
HerrBisch
I think you're splitting hairs here. The relevant thing is that the figure of 400 degrees was not precisely measured or calculated.
dreikommavierzehn
This distuingishment is crucial. It means that we don't care* about a measurement or calculation of those 400°, because it is the premise.
derju
Wirst estimation was that all kinetic energy would be transformed into heat (and only heating the chicken) while in reality most would 1/2
BunnyBooBear69
Not only that, but also how they straight up ignored the fact that the chicken will lose heat between each individual slap.
derju
Besides only a fraction of the kinetic energy would be transferred to the chicken and a fraction of that converted to heat directly
NotRaiko
Thats why you just gotta slap it once really really fast.
derju
Accelerate the chicken (probably mush at this point)
snipekill1997
Well what do you think will happen as the chicken slows down due to friction?
derju
Quite some energy will be lost accelerating the air and creating turbulences. Even if it was a perfect inelastic collision this guys math1/2
derju
Is way of
UsernamesAreStupidAnyways
Well, they were only calculating how much kinetic energy you needed to get the requisite amount of thermal energy. Not the other effects 1/2
UsernamesAreStupidAnyways
the impact would have on the chicken. 2/2
derju
Quastion was how fast you would have to slap a chicken to cook it, so he should at least treated it as an perfect inelastic collision 1/2
derju
In a vacuum. No matter what way you look at it the math is phony at best
UsernamesAreStupidAnyways
You all do realise that the question and the answer were very likely made just for shits and giggles, right? The kind of accuracy people 1/2
Legomastar
So I saw the post, I understand the physics, but I don't get how this is seen as funny. Can anyone explain the humor?
olekingcole001
Mathematically correct, but realistically ridiculous. Similar way to get this reaction- tell them Albert Einstein flunked math class.
smashpro1
The absurdity.
xdvgx
Slapping is an unconventional cooking method, and it would be difficult to slap anything at mach 4, let alone a chicken. Hence, humerous.
Chefroy
Why is anyone worried about cooking a chicken by slapping? And they are putting so much thought into. Thats why its funny to me.
Gaidenninjacat
The math in the post was so off I don't even know where to begin.
Broonstar
It's the spherical horses all over again. Math, that while correct, would never work in reality.
Etereo
Self referential for the sake of it, that is enought on the internet
Strauss73
Actually I don't think it was meant to be funny.The guy actually did the calculations.The funny part is the fact that someone did.
TunnelRat13
Well, if you cook chicken to 400F, you've made ashes. Second, we can slap about 150mph tops.
GrandePadre
It’s funny because physicists are able apply complex math to solve serious life enhancing questions. We’re asking about slapping chickens
jdcream
DavidBrooker
*badly
TheGoudeAbides
Physicist here. This. Also I’d assume the slap needs to be a purely inelastic collision. That and air resistance gon make your hand hot.
PleaseRespectMyAsshole
I'm not a physicist or even really a smart man but wouldn't that just blow the damn chicken to pieces?
Retromorphic
So... It would cook the chicken... Hmm interdasting...
Yesisaidthat
Better question, how big of a piece of ice would you have to toss at the sun for a piece of ice to reach/touch the sun's surface?
Retromorphic
Actually not much ice per-se, but the water would have to be highly compressed. There is a planet like this, check it out
Retromorphic
GJ 436 b
GuardsmanMiku
depends how fast you throw it
DorthLous
... Air Resistance? We're talking 4 times sound barrier here. You will literally shatter yourself.
GuardsmanMiku
mach 4 at sea levels probably gonna incur some shock heating
Retromorphic
Maybe, but I don't see how shatting yourself is relevant
GrandePadre
But is it cooked or just seared? What’s the R-value of chicken skin? How will I sleep tonight not knowing?
TheEmeraldProphylactic
Near side cooked, far side raw (apparently)
potshot
Well more like the entire chicken is a combination of fine red mist and unidentifiable meaty chunks.
cntdn
It's fuckin obliterated, along with the hand
STINKPICKEL
Visual of it ...
CreatureFromtheBlackLegume
Wear a glove
TheGoudeAbides
Gloves not hot?
DavidBrooker
Air resistance isn't anywhere near the heat load of compression heating. Viscous heating is probably negligible.
DavidBrooker
eg: compute the skin temperature of Concorde from compression and you get 200C. Add in friction and you only go up a couple degrees
TheGoudeAbides
Fair enough. Though I am wondering how the internals of a hand would handle the accelerations. Both probably end up liquified or dissociated