The Black Hole Tipping Point

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This video is about the Schwarzschild radius of a black hole, (its "event horizon"), and how much mass and density is required to reach the point of no return where an object like a star, neutron star, red giant, etc will collapse into a black hole singularity. You can calculate it yourself using just the volume equation for a sphere, and the equation for the Schwarzschild radius (and knowing the speed of light and Newton's gravitational constant).
REFERENCES
Lecture notes on black holes: eagle.phys.utk.edu/guidry/astr...
Mass of cat: www.google.com/search?q=mass+...
Schwarzschild radius: en.wikipedia.org/wiki/Schwarz...
LIGO Neutron Star Binary Merger: www.astronomy.com/news/2017/10...
Tolman-Oppenheimer-Volkoff Limit: en.wikipedia.org/wiki/Tolman%...
Neutron Star Equation of State & Density: chimera.roma1.infn.it/OMAR/dot...
Neutron Star Radius: citeseerx.ist.psu.edu/viewdoc/...
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich

Пікірлер: 2 500

@Madamoizillion 6 жыл бұрын

"Cats aren't as dense as rocks." I dunno, I've met some pretty dumb cats.

@BladeOfLight16 6 жыл бұрын

Still not as dense as rocks. Don't believe me? Which one would run away if you try to drill into it?

@aqimjulayhi8798 6 жыл бұрын

BladeOfLight16 *facepalm*

@Abdega 6 жыл бұрын

BladeOfLight16 turns out not all cats run, Now if you’ll excuse me, I have to clean my living room

@gia257 6 жыл бұрын

perhaps the rock would if it had legs, to do a proper comparison you need a saw first

@maryanne5670 6 жыл бұрын

Madamoizillion hahahah good one

@Fajowski50 6 жыл бұрын

I like how cats are an official unit of measurement on the internet.

@TKNinja37 6 жыл бұрын

Cats are the official unit of all Internet measurements. It is known.

@justinrosman1020 6 жыл бұрын

Nigel Thornberry it is known.

@petersalucci5444 6 жыл бұрын

Nigel Thornberry haha yeah

@gtPacheko 6 жыл бұрын

Toyota corollas are too

@AnonymousXenomorph 6 жыл бұрын

I thought is was bananas

@ElisaCecconello 6 жыл бұрын

"Ferb, I know what we are gonna do today!"

@catgirlsleepy 3 жыл бұрын

*deletes the universe*

@giovannimorsa429 3 жыл бұрын

"Hey, where's Perry?"

@astroboy3291 3 жыл бұрын

That made my day! xD

@dailysacrificedoublee 3 жыл бұрын

Giovanni Morsa Dooby dooby doo BAH dooby dooby doo, BAH

@adityasudhir3928 3 жыл бұрын

Let's make a black hole

@thewatcherinthecloud 6 жыл бұрын

Medicine's preferred test animal: Mice Biology's preferred test animal: Frogs Mathematics' preferred test animal: Rabbits Physics' preferred test animal: Cats I wonder what chemistry's preferred test animal is.

@victorayorke7123 6 жыл бұрын

Undergrads.

@crazydave9938 6 жыл бұрын

Spherical cows.

@hunterp913 5 жыл бұрын

Moles

@rydernigga5675 5 жыл бұрын

Humans

@bentrayn 5 жыл бұрын

Definitely moles

@theCodyReeder 6 жыл бұрын

A cat has a density of just less than 1g/cm^2 no math needed I just put a cat in a tub of water. I am regretting that decision though.

@Fun_maths 3 жыл бұрын

Hahaha

@captainchicky3744 3 жыл бұрын

Oh hey youre here

@hasanmuhammad6651 3 жыл бұрын

@@x_x5009 nooooo :(

@terigonUSAS12 3 жыл бұрын

the cat will literally kill you

@user-rc8bb7yb1e 3 жыл бұрын

hmm

@colinsmith1495 6 жыл бұрын

... "How to turn your cat into a black hole." ... Awesome, man.

@spaceracer6861 6 жыл бұрын

Strap a slice of bread, preferably toast-shaped, with butter on the side facing up, on the cat's back and throw it somewhere. I'll let you figure out the rest.

@michaelhedrick3000 4 жыл бұрын

Space Racer you monster

@paulmichaelfreedman8334 3 жыл бұрын

Simple. Just squeeze real hard

@stevehenderson6090 4 жыл бұрын

4:10 Google is going to wonder why so many people are looking the the density of a cat

@soratachibana3572 3 жыл бұрын

I saw the two "the" yes it takes about a year for someone to notice

@alexg_v0.040 3 жыл бұрын

@@soratachibana3572 lol

@ShirleyCurryTheOlderGamer 6 жыл бұрын

In reading the comments I'm so happy to see how many know about Schrodinger's Cat, the double-slit experiment, and String Theory!!

@zachatyshafer9836 3 жыл бұрын

schrodingers cat was an idea used to disprove superposition. its not actual science. What he was saying was that a cat cannot be both alive and dead at the same time, so neither can a particle. He was wrong

@kkpzplayz9909 3 жыл бұрын

Hi grandma Shirley!!!

@justmehere_ 3 жыл бұрын

schrodingers cat and the double slit experiment are like the most famous experiments in physics, they are like the first thing you hear when you start learning about quantum

@Adhjie 2 жыл бұрын

@@zachatyshafer9836 yes dirac i know u calculate while einstein hunch got him the place quit yapping ur sea wiltcha?-gloomy kyouma at the sim attractor fieldian of kotoamatsukami worldline when all the dud is still at the urheimat literally alone in a not long ago broken apart island cipangu

@hexcodeff6624 2 жыл бұрын

If you can't write Schrödinger, because you have no ö-key and are not willing to copy-paste it from somewhere, which is completely understandable, then write Schroedinger, with an oe instead of an ö. It's still correct and easy to write.

@thenotflatearth2714 6 жыл бұрын

If I fall into a black hole, will my family receive money from the insurance company? Because the lawyers and everyone in the company will observe from the outside of the black hole, meaning they can always see my red shifted shape on the event horizon. Which means to them, the accident hasn’t happened and never will, because they will never see me fall into the black hole, but only me falling but slowing down and becoming redder constantly. But from my perspective I did, soooooo....

@Shinsei. 6 жыл бұрын

theoretically they'd know you're beyond any saving and most likely dead. your family will receive the cash dont worry ;)

@georgehiggins1320 6 жыл бұрын

stop.

@MattDesignsTV 6 жыл бұрын

That is one quite interesting question actually, I've asked that myself a few times already, so I think, if you fall into a black hole (from your perspective), your family (or whoever else) could be thinking, that you are already dead, since now a days people know, that falling into a black hole isn't falling into a black hole from every perspective🤔

@d.thieud.1056 6 жыл бұрын

Supreme but you will not die untill te black hole dies, you will dall slower and slower but never actualy die because time runs so much faster for you than the outside world

@vornamenachname2727 6 жыл бұрын

Dorssen Derhaeg You might starve after some time

@MegaPhester 6 жыл бұрын

Internet police will scratch their heads when they see the thousands of searches on cat density and nuclear physics...

@ronraisch510 6 жыл бұрын

what is the density pls???

@4ltrz555 5 жыл бұрын

@M.A. R he asked what's the density of the cat.

@TJStellmach 4 жыл бұрын

@@ronraisch510 Well, a cat floats in water, but only just barely. So its density is roughly that of water, 1 metric ton per cubic meter.

@Exaspatial 4 жыл бұрын

I like how you called them "Internet police".

@scienceium5233 3 жыл бұрын

welcome to nerds organization

@PictureFit 6 жыл бұрын

I'm just here for the confusion.

@arham5313 6 жыл бұрын

PictureFit love your videos man

@tragik528 6 жыл бұрын

You're just here for attention.*

@shardulbhalerao414 6 жыл бұрын

Tragik, It depends.

@rupayandas5088 6 жыл бұрын

it depends

@joshurlay 6 жыл бұрын

Tragik Wouldn't you be here for the attention too then? Just wondering, is a person automatically seeking attention when they post a comment from a verified channel?

@yanivhekter6608 6 жыл бұрын

Let's assume that cats' density is exactly 1 g/cm3, the mass of the black hole will be 136,000,000 sun masses with a radius of 401,200,000 km.

@hoedoe5981 4 жыл бұрын

Nearly same result

@imademedikasurya3917 4 жыл бұрын

Same

@scienceium5233 3 жыл бұрын

i got 490 000 000

@nickchester8194 2 жыл бұрын

would there not also be a proportional increase in density as you add cats?

@Mysoi123 Жыл бұрын

@@nickchester8194 yeah its technically not true since the volume shrinks as the mass increases. the problem assuming a spherical object occupied the volume of the black hole with the density of a cat.

@TheOneTrueLeo 6 жыл бұрын

So do I feed the cat until it becomes big enough to collapse into a black hole or do I start rolling up enough cats in a ball? Please clarify!

@fleurlovin3522 6 жыл бұрын

Why would you do that?? Post a fake link

@SKyrim190 6 жыл бұрын

You do the first one if you are that super weird episode of Garfield that has him growing into a fat devouring giant. You do the second if you are katamari

@nobrainer1923 6 жыл бұрын

Why use cat why not do you

@dragoncurveenthusiast 6 жыл бұрын

I would suggest to do the second. If you try the first, most of the new mass will be fat, which has a much lower density than other types of tissue such as muscle. In the first case, you will need more mass until your cat finally becomes a black hole.

@MrTete30000FR 6 жыл бұрын

Depends on the density of the food your feeding to him I guess

@thechaosgardener 3 жыл бұрын

Lots of theoretical cats are getting theoretically harmed in theoretical physics.

@bismoose5444 4 жыл бұрын

"Cats, The Sun and Earth aren't black joles... *yet* " Ok, Henry, calm down

@gabrielboffdeon1694 3 жыл бұрын

2020, please DO NOT DO THIS

@ranjinijaikumar7212 3 жыл бұрын

@@gabrielboffdeon1694 2020 didn't... But 2021 will!

@keithtorgersen9664 Жыл бұрын

@Himanshu Raj, 2022 didn’t but 2023 will!

@Corn138 4 ай бұрын

⁠@@keithtorgersen96642023 didn’t but 2024 will!

@HotelPapa100 4 жыл бұрын

1:57 It's actually the other way around. In a supernova the mass of the star is so large that, lacking more radiation pressure of new fusion, it collapses into a black hole anyway. The supernova is a result of the rebound of neutrinos generated in the process racing through the material of the star still outside the Schwarzschild-radius.

@kenj0418 6 жыл бұрын

Assume a spherical cat of uniform density...

@DielectricVideos 6 жыл бұрын

Sounds like a problem from my EMAG class...

@christopherg2347 6 жыл бұрын

...while ignoring the effects of gravity...

@genericgamer1271 6 жыл бұрын

Lol

@lorenzopiglia8671 6 жыл бұрын

...and ignore effects of friction

@alexanderchia901 5 жыл бұрын

that's my cat,spherical in shape with the density of a neutron star ha...ha...ha virgin jokes

@mikew1332 6 жыл бұрын

I live with two black cats. To one of them, I explained what a yoctometer is. To the other, I described the difference in density between cats and rock. Despite the small sample size, I'm confident that I measured a nearly identical effect for each. Both cats ignored me, one slightly more emphatically than the other but within the range of error. Cats don't care about black holes, Henry. Even black cats.

@beastslayer9691 4 жыл бұрын

4:10 - I challenge you.... Me - challenge declined

@robertgoff6479 3 жыл бұрын

"Cats aren't as dense as rocks." Worth the whole video for that line.

@Dandelion_Stitches 6 жыл бұрын

TIL cats aren't as dense as rocks. I don't know if my observational data corroborates that though, at least not when they jump on my chest at 3 in the morning.

@ray-Bolantah 6 жыл бұрын

Winkberry 🤦🏽‍♂️ that is exactly the point of the assignment.they already gave you the answer for rock density. Now they challenge you to find out the answer but swapping (rock density >cat density). But since cats are composed of more than 1 element you’d have to separate every single element of a cat and then look up their density, then add that together and multiple🤷🏽‍♂️

@Dandelion_Stitches 6 жыл бұрын

Ray Dominguez I don't see how that will stop them from waking me up. In fact, taking them apart would probably make me unable to sleep for a month!

@ray-Bolantah 6 жыл бұрын

🤦🏽‍♂️

@nut1867 6 жыл бұрын

🤦🏽‍♂️

@paulmeyer6202 6 жыл бұрын

🤦🏽‍♂️

@AbudBakri 6 жыл бұрын

Schwarzschild is now my favorite word. I will try to sneak it into sentences.

@matko8038 6 жыл бұрын

SchwarzSchild*

@AbudBakri 6 жыл бұрын

This pizza is Schwarzschild

@mirist_kalt 6 жыл бұрын

Dr.StickFigure you just sad black child lol

@nefaristo 6 жыл бұрын

Dr.StickFigure by sneezing I suppose

@AbudBakri 6 жыл бұрын

Jan Edzard now I like it even more

@ESL1984 6 жыл бұрын

You didn't mention the fact that the observable universe seems to be inside it's own Schwarzchild radius.

@ESL1984 6 жыл бұрын

Btw, black holes don't need to be dense, a lot of massive black holes are not so dense.

@georgelionon9050 6 жыл бұрын

Yes, albeit technically crunching in the numbers, they are off by a factor of about 10, which isn't really that much to be honest... It has to be that way, considering the universe is bigger than the observable universe, and it continues to be more or less the same as what we can observe (which all evidence seems to support). There must be some point, at which any given density is considered to a black hole from an outside observer...

@adrianflemmen7305 5 жыл бұрын

If IT wasnt for the universe expanding the universe would have been a black hole

@JFreex 4 жыл бұрын

Mind blown... didn't know that. It would be interesting if our observable universe acting as a black hole could attract other galaxies or stuffs towards us ... aliens maybe (LOL) ?

@JFreex 4 жыл бұрын

@@adrianflemmen7305 Btw I wonder if the expanding (observable) universe could be explained by gravitational force of things outside the range we can observe :/ (though I don't think it would hold true, since the gravitational force might be too weak to attract our universe away from us)

@upsidedown5763 6 жыл бұрын

“I challenge you to figure it out using the equations and leave it in the comments” Considering that I understood about 1/10 of the video, I would say my answer would be 5

@rhapsoblu 6 жыл бұрын

First, assume a spherical cat.

@flammablewater1755 6 жыл бұрын

My cat is pretty much spherical.

@joelhaggis5054 6 жыл бұрын

flammablewater I'm so glad this comment exists.

@zedacht8389 5 жыл бұрын

cylindrical would be a way better approximation tho.

@ddunseo 5 жыл бұрын

First, let cat be in a spherical bowl. It's possible, because cat is liquid.

@kumarashish2051 5 жыл бұрын

Rather than assuming lets feed the cats too much that they come close to a sphere 😂

@billrussell3955 6 жыл бұрын

This is one of the best simple physics videos I've seen in a while that actually shows some of the mathematics, and recognizes the man that gave it to us!!! Thanks so much for producing it!!!

@joshuamason2227 5 жыл бұрын

Unclear instruction, my cat turned into a neutron star

@davialex3559 4 жыл бұрын

Some time ago I've realized that densiti can be directly related to a specific Schwarschild Radius and calculated for some materials. Interesting or not, a black hole can have a gravitational surface acceleration enven smaller than the Earth, too

@jetkwan2935 6 жыл бұрын

What is the average density of a cat?

@materiasacra 6 жыл бұрын

approximately 1 kg/liter, like water Main variability: the amount of air in the lungs, which adds to the volume but almost nothing to the mass. Are you squeezing all the air out of your cats? Other important factor: fat percentage. Is your cat fat? Then it is more buoyant :-)

@jetkwan2935 6 жыл бұрын

Buoyancy isn't of much significance here methinks 😐

@materiasacra 6 жыл бұрын

Submerging your cat in water is an - admittedly dangerous - way to measure the volume of your cat, which you can combine with its weight to obtain its density :-)

@jetkwan2935 6 жыл бұрын

materiasacra water displacement eh?

@tanishsurana4972 6 жыл бұрын

Fk Kwan weight your cat , submerge it in a tub full of water, measure the volume water displaced, calculate density by formula mass/volume .Thats it. And also hope that the cat survives

@MrCarlozan96 6 жыл бұрын

According to my calculations, assuming an average cat density of around 850 kg*m^-3, I obtained a radius close to 4,34*10^8 km, which is almost 2.9 AU. I'm pretty sure of my result but I think that some peer review would be very helpful. If you are interested, I did it by finding the radius from the sphere formula and putting it into the Schwartzchild radius formula. I than isolated the mass and guessed the cat's density in order to calculate it. In the end, I put the newly found mass in the sphere formula in order to get the final radius.

@tkftns 6 жыл бұрын

Mr.Carlozan can you help me find it please, firstly you used the M=density x 4/3π x r³ to get the radius of what? And which Mass you put in the M?

@Anvilshock 6 жыл бұрын

Schwarzschild* It's literally spelled out in the video as well as its description. Just replicate letter by letter. How fucking dense must one be to still get it wrong??

@TheSocks221 6 жыл бұрын

I think you estimated a cat´s densitiy a little to high

@norbertasc9126 5 жыл бұрын

Nice!

@seohyunpark6400 4 жыл бұрын

I obtained a significantly lesser answer (1.36au) since I used 380 kg/m^3 as a cat’s density (8.9 pounds as the mass and 648 in^3 as the volume). I’m not completely sure of my answer though.

@abhishekkaundal7663 4 жыл бұрын

3:51 Pretty cruel way to compress your cat

@Gerben0 3 жыл бұрын

Squish that cat!

@christopherbrent3759 3 жыл бұрын

Just make a cardboard box one trillionth the size of a nucleus and the cat will compress itself.

@ethanyap8680 4 жыл бұрын

I know I'm a nerd, but you'll thank me later. To find the radius of material where it correlates to the event horizon, I derived this cute little equation. z = ~6.2087*10^-27 p = density R = Square root of (1/pz) Derivation if anyone's interested: Swarschild radius = 2GM/c^2 R = radius M = p×4/3×r^3×pi New Swarschild equation = (8Gp×pi×r^3)/3c^2 C, G and pi are constants, so the equation simplifies to (6.2087×10^-27)pr^3 If Swarschild radius and radius is the same, then Z = 6.2087×10^-27 R = Zpr^3 1 = Zpr^2 1/Zp = r^2 R = Square root of 1/Zp Thanks for reading this

@puckry9686 4 жыл бұрын

Thanks

@Captain_Mike82 6 жыл бұрын

When my cat is asleep on my lap, he becomes much more dense than rock.

@ourboyroy9398 6 жыл бұрын

try throwing a rock with an equal volume to your cat and compare the results

@alexwang982 4 жыл бұрын

It’s a joke mate

@Buchaven959 6 жыл бұрын

Please see "A Mole of Moles" article by Randall Munroe for help getting started on your own cat black hole!

@crazydave9938 6 жыл бұрын

That's a meat moon of moles. Gross.

@user-ss3oz7by1g 3 жыл бұрын

I was thinking about that! Here's the link, for anyone looking for it: what-if.xkcd.com/4/

@duxtorm 3 жыл бұрын

This video would've been so blood helpful when I was trying to figure out how many salmon you'd need for it to compress into a black hole

@gunyukwunny 2 жыл бұрын

Currently doing that with bees. This is very hard.

@duxtorm 2 жыл бұрын

@@gunyukwunny I would tend to agree.. what is the gravitational force of a bee?

@duxtorm 2 жыл бұрын

@@gunyukwunny The so called _"smart"_ discord people kept on insisting "nah, you just need one because any amount of mass can become a black hole", like oy! Smartass! I meant by itself, just left to its own devices, how many fokn fesh would it take to make a black hole! Then I was mocked :3

@PsychicImpala 3 жыл бұрын

I don’t know why I’m so addicted to this channel when I have no clue what any of this means

@justvibin1087 6 жыл бұрын

Ok I actually have a degree in astronomy and I calculated the answer: a lot.

@thedeemon 6 жыл бұрын

That's within factor of 2 or 3 from the right answer. Accepted!

@ahmedrayyan4318 6 жыл бұрын

Jazzy Jay Please tell me how they got the 140 million km radius for the Earth’s swarchzchild radius

@justvibin1087 6 жыл бұрын

Ahmed Rayyan That is the mass and density needed to create the collapsing forces to create a black hole. Use constants like the speed of light and gravity to calculate....its complicated.

@rowboat_3464 4 жыл бұрын

But according to the only video on your channel, 2 years before you posted this you were in a science class playing with water and dye, in the case that you were at the end of your college semester i dont think that is something college students would do, plus you didnt sound that old at all

@cyborgbob1017 3 жыл бұрын

Thanks, I really needed that

@Mike__B 6 жыл бұрын

Correction over why giant/massive stars make black holes, the super nova is not compressing the core, the gravity of the star and the fact it's no longer making energy to balance out that gravity squeezes the core to become a black hole. Plus there's more than enough mass in the cores of these very massive stars (>25Ms) that they can overcome both electron and neutron degeneracy, so in the end gravity just wins. Even if the star did not explode in a super nova the core would become a black hole.

@rocketcrazy3467 6 жыл бұрын

Although, in the end only super big stars and very large combining stars supernova. And also the supernova does help creating the black hole, but you are right the star doesn't have to go supernova to create a black hole, if sufficiently massive

@JM-us3fr 6 жыл бұрын

So what causes the explosion? I thought the supernova was the result of the non-core mass rebounding off of an ultra-dense core. It follows that the core cannot be a black hole until after the supernova, otherwise the surrounding mass would just fall into the black hole resulting in no supernova. Isn't that right?

@Bodyknock 6 жыл бұрын

Remember the black hole within the core is incredibly, incredibly small compared to the size of the rest of the star. Some of the matter will fall into the hole but a huge amount of matter will miss the hole and ricochet and rebound off everything else near it. Think of it like having a bathtub with a tiny, straw-sized drain and shooting a firehose at the drain. Yes, all the water that directly hits the drain will be gone forever down the drain, but a huge amount of water will miss the drain and bounce back off the tub and water near the drain.

@luongmaihunggia 6 жыл бұрын

Yes, you are right, super massive stars become black hole because all the fusion reactions in the star have stop and can't no longer push against the star massive gravity so it can't prevent the star from collapse on it self and become a black hole.

@Mike__B 6 жыл бұрын

@QED not sure what the latest research says, but I seem to recall it was not well understood. What I got from it "back in the day" was the collapsing layers initiated a massive fusion event since the compression causes temperatures to spike to hotter than the core originally was, this creates all sort of weird things (particle pair creation, rapid fusion, etc) and this sudden burst of energy is what "rebounds" the layers outward. Very similar to white dwarf SN1a creation, where carbon fusion just runs wild once they pass the Chandrasekhar limit and kaboom.

@markhuebner7580 2 жыл бұрын

Very well done! Lots of good visual perspectives derived from the equations presented. Math and multiple real world examples of the math applied!

@Bammab127 6 жыл бұрын

"Today we have little Timmy who force-fed his cat until it reached 300lbs. Now little Timmy, why did you feed him this much?" "We ran out of food" "Okay, but why were you feeding him?" "I was told if I gave my cat enough mass, it can become a black hole"

@chimkinNuggz 6 жыл бұрын

Why make blacks holes out of cats when u can just put a cat in a box and predict it is alive and a blackhole at the same time

@anselmschueler 6 жыл бұрын

No. The cat is both dead and alive in the famous thought experiment because there's a 50% success rate killing machine in there. If you make a 50% success rate black hole machine, why the box?

@wingdings5812 6 жыл бұрын

Schwarzchild's Cat

@icarus745 6 жыл бұрын

I like the way you think.

@marksmod 6 жыл бұрын

@jimm638 6 жыл бұрын

more accurately, there is actually a 50% chance the cat did/didn't compress down to the size to become a black hole..

@YouSwellow 6 жыл бұрын

Schwarzschild has to be the most "OC" name ever

@stug6974 6 жыл бұрын

*schild

@PhoenixBlazer39 6 жыл бұрын

Original Character?

@nealdesai8779 6 жыл бұрын

Of Course?

@Thror251 6 жыл бұрын

It's a scam, It doesn't work

@starling1226 6 жыл бұрын

OC? Original Character? Orange County? What do you mean by "OC"?

@poios4148 6 жыл бұрын

I think this is the best video you have made yet!Please don't stop posting!!!

@frozenfire2634 4 жыл бұрын

Love how you pronounce schwarzschild

@frozenfire2634 4 жыл бұрын

@@keysmash_roa no

@overpowered5919 6 жыл бұрын

4:11 Its okay, I take your word for it lol

@elefant213 6 жыл бұрын

I am from Germany and it is funny how you say "Schwarzschild" 😁

@matko8038 6 жыл бұрын

XD Shworzschild

@Lucas-eb6gt 6 жыл бұрын

Es hört sich an wie "Shortschild"

@abxorb 6 жыл бұрын

Hey, at least they didn't pronounce it as "Shwarts-child", like most do.

@matko8038 6 жыл бұрын

AbXorb ahahahaha

@XxDungeonGamingxX 6 жыл бұрын

black shield, he said that at 1:18

@mattkreinheder55 Жыл бұрын

Great video, really helped me understand this concept!

@jengl_exe 6 жыл бұрын

I really like the little challenge at the end of the video involving doing the math. It's a great little bonus with the video, and I'd honestly be totally ok with seeing more of that.

@milomhoek 6 жыл бұрын

Instructions unclear, my cat has collapsed in to a black hole!

@georgelionon9050 6 жыл бұрын

My cat coughed up one!

@crmesson22k 6 жыл бұрын

that is a lot of cats

@forestfire2670 6 жыл бұрын

A cat lovers dream and nightmare. Trillions of cats to cuddle but trillions also burnt by the heat of the sun or killed by the vaccum of space...

@tfkfunguy9109 6 жыл бұрын

Oooooooorrrrrrrr just one genetically modifide large big cat

@Scorpionwacom 6 жыл бұрын

Don’t care much. I like mice and gerbils.

@MattieCooper10000 6 жыл бұрын

Kitties are TENDERS!

@letsgetreal2501 6 жыл бұрын

Have to agree😂

@TheEvilCommenter 6 жыл бұрын

"Cats aren't as dense as rock. " Idk my cat gets stuck in a tree pretty regularly.

@adamlifevictor5772 4 жыл бұрын

He meant dense as in DENSity not IQ

@Strav9 6 жыл бұрын

Finally a video where I can comment on I missed minute physics comment section

@Yamnasm 6 жыл бұрын

The last one was toxic as hell, wasn't really worth looking at.

@AutismIsUnstoppable 6 жыл бұрын

That video was toxic as hell. heres a copy of my comment from it. "after careful analysis the statistics tell us we're biased and even hint at where those biases are or aren't coming into play know the paradox is that we've remained so reluctant to fight our biases even when they're put in plain sight." So after explaining how there can seem to be bias but in fact be down to personal choice of the individual (what college course they chose) your conclusion is "we've remained so reluctant to fight our biases even when they're put in plain sight."

@mostlysure1077 6 жыл бұрын

Autism Is Unstoppable yea, I too was confused by his conclusion considering what the Simpson paradox is. He was all like statistics don't mean shit. bois just didn't want to do the same types of jobs as girls, and then instead of saying that because of this we should be careful of bias, he says collages CAN exploit this paradox so we are now ignoring bias and this is bad news for equal rights.

@lynniesaade4710 6 жыл бұрын

One minor error: The Schwarzschild radius is the radius of the event horizon, but it is NOT the internal radius (i.e. distance from event horizon to center) of the black hole, because the interior is extremely curved. There isn't even a way to uniquely define the internal volume there. It depends on choice of coordinates.

@MegaAwesomeNick 6 жыл бұрын

This video misses the third way a black hole can be made not only by mass density but out of pure energy. Its called a kugalblitz and it happens when you pack enough energy into a space that it the energy mass equivalence passes the Swartzschild radius. It takes a lot of energy though.

@KohuGaly 6 жыл бұрын

mass and energy are equivalent in general relativity - they are pretty much the same thing, just expressed using different units...

@JM-us3fr 6 жыл бұрын

Also there's another way. Primordial black holes are natural deformations created during the birth of the universe, and they began with no associated mass.

@jimm638 6 жыл бұрын

yeah, not in our lifetimes..or probably even the next 30 generations lifetimes

@luongmaihunggia 6 жыл бұрын

Dude, that is still density. +1 sin for being stupid *ding!*

@vircaprae3060 6 жыл бұрын

Kugelblitz* Schwarzschild*

@31_samayrakshit_xi_sc44 4 жыл бұрын

Thank you for your info !

@MegaMewtwo151 6 жыл бұрын

Brilliant video guys, keep it up

@bitvanbite 6 жыл бұрын

So that's what happened to my cat.

@SlippyLegJones 6 жыл бұрын

Swallowed by a young demogorgon obviously.

@peternebesny5542 4 жыл бұрын

What I learned today: Cats aren't as dense as rocks

@limbo5190 3 жыл бұрын

I love how you explain complex things using simple maths.

@tylerhorihan786 4 жыл бұрын

Great tutorial! very easy to follow. did it at home in just a few minutes!

@duaneappo4150 4 жыл бұрын

You put together half a solar system of cats and made a black hole. Well done bro!!! I thought it would take longer???

@Miimu5210 6 жыл бұрын

why is there hair around my black hole?

@SamTheLumbee 6 жыл бұрын

Mi 😂

@memeislovememeislife3369 6 жыл бұрын

Wrong channel 😂😂

@materiasacra 6 жыл бұрын

Around is the best you can do, because black holes themselves have no hair, according to a very famous statement by Wheeler: en.wikipedia.org/wiki/No-hair_theorem

@garethdean6382 6 жыл бұрын

Actually there have been some recent papers suggesting holes may in fact have soft electromagnetic hair: arxiv.org/abs/1606.03226

@prokokex1365 5 жыл бұрын

So much for no-hair conjecture😂😂😂🤣🤣🤣🤣🤣🤣😂😂😂

@AllHailZeppelin 5 жыл бұрын

This video is gonna cause a huge spike in Google searches for “density of a cat” BTW, the answer is √(3c²/8πGρ), or ~389 million km (2.6x the distance from the Earth to the Sun)

@juicelyric8111 6 жыл бұрын

Please keep uploading!

@it_was_my_cat 4 жыл бұрын

Therefore, you don't necessarily need a lot of density in order to make a black hole. Supermassive black holes can actually be less dense than air.

@liv9589 6 жыл бұрын

I love the way you say schwarzschild

@ThatWarioGiant 6 жыл бұрын

DerGuteKönigDesAssozialenNetzwerks Sektion c1-37 yeah I’ve always heard it pronounced Schwartz Child

@owen_z_schwartz 6 жыл бұрын

WarioGiant But there’s no t in it and do you hear others pronounce the ch or not. Coming from someone with the last name Schwartz. (Pronounced: sh-warts)

@Szydencer 6 жыл бұрын

It's pronounced ʃvaʁʦʃɪlt or Shhh-Farts-Shield. Picture farts that are made at the Schwarzschild radius, being inaudible on the account of being sucked right into the black hole immediately.

@Grimner6 6 жыл бұрын

hey, i got a question : what would happen if you were to put a planet on another (like litteraly the planet's ground touching the earth's)? But not by dropping it, just by putting it gently so there's no collision damage.

@ZsoltPinters 6 жыл бұрын

Grimner after millions of years they would become one giant melted planet with more vulcanic activity than hell

@Grimner6 6 жыл бұрын

i guess, but i'd be interested in having a precise explanation, of how the first seconds / minutes / days would go... can the two planets can stay on top of another for a given period, etc...

@Stickyxgo 6 жыл бұрын

If you put another planet "gently" onto earth with no velocity with respect to earth alot will happen. Most notably since the earth has an equatorial speed of 465.1 m/s you would expect a massive collision as soon as the planets touch, followed by 1000+ meteroids being swung onto the surfaces of the planets, followed by massive destruction within the first few days. Extinction for sure

@Grimner6 6 жыл бұрын

yep i guess x) but i mean if you find a way to put it gently like litteraly 0 issues until the other planet has "landed" Exctinction is for sure, but i'm still curious about the details :P If we were to not go extinct at the few first seconds, how would we feel gravity? if you were at the place where the other planet has landed, could you climb on the other one? How would the oceans, the clouds and all that stuff behave? Please upvote if you're also curious :D

@LordPelegorn 6 жыл бұрын

well it depends on the mass of the second planet in relation to earth (obviously). if they were the same mass the new center of gravity would at the touching point of the planets which means that at that exact point you would not feel any gravity at all (expect the sun and so on but not from the two planets) meanwhile on the other side of the earth the gravitational pull would all of a sudden double making everything twice "as heavy". Of course such a situation would not be stable at all since the matter of the planets would now be pulled towards the new center of gravity and not to the center of the planets anymore probably breaking the earths crust and resulting in huge waves towards that point. after long enough the planets would merge to one big one id image

@cynsen 6 жыл бұрын

This is such a great channel!

@PulmonesLock 6 жыл бұрын

Thank you. I enjoyed this allot

@elijah_10000 6 жыл бұрын

I watch these videos to make myself seem smart...

@georgelionon9050 6 жыл бұрын

Emphasis on seem :-/. You don't get really smart through a few minutes. It takes a little more investment.

@elijah_10000 6 жыл бұрын

George Lionon dont get all but hurt, it was a joke

@georgelionon9050 6 жыл бұрын

Thats why I also had upvoted your comment, due to all the but hurt :-/

@elijah_10000 6 жыл бұрын

George Lionon haha...fair

@Reoh0z 6 жыл бұрын

I'm not sure about that, my cat's pretty dense...

@vinq8621 6 жыл бұрын

I just realized I love the music because it's low mellow, and not shrill and distracting- but it still adds a lot to the quality of the video.

@MayOrMayNotBeAHuman 4 жыл бұрын

I think this would have been a good video to mention the fact that black holes under a certain mass cannot sustain the density required to “stay” a black hole for a significant amount of time. Basically, compressing any old mass down to a tiny volume won’t actually work, because the forces inside the tiny black hole pushing out will exceed the force pushing the matter together.

@Chigger 5 жыл бұрын

"I know what we're gonna do today, Ferb!"

@bilthon 6 жыл бұрын

I was expecting you to talk about the kugelblitz

@densmack2967 6 жыл бұрын

Nelson Perez I think I will be the only one to get that lol

@owenczyzynski5938 6 жыл бұрын

I get it

@owenczyzynski5938 6 жыл бұрын

It’s a black hole made out of light

@cemadatepe5188 6 жыл бұрын

It's the theoretical black hole that forms from an immense concentration of light. Den smack, not the only one to get it.

@komplettichselbst 6 жыл бұрын

Kudos to you for being the first English speaker I have heard to pronounce 'Schwarzschild' almost correctly. Virtually everyone pronounces it as Schwarzs-child and not Schwarz-schild. The difference in English is enormous

@sohamdutta5536 6 жыл бұрын

Density of organic body (used human, for simplicity): 1062 kg/m3 Setting r = rs, we get a required mass of 260683794751969427943582913324619137024 kg for that density Plugging back into the cubic root radius equation, we'd need to stack cats to a radius of 3.8841885 × 10^11 meters Which is more than twice an astronomical radius (distance from earth to the sun), 1.496e+11 meters (calculation can be improved by measuring cat density by dunking cats in water and measuring volume displacement)

@chaitanyaparanjape7837 6 жыл бұрын

Expression for radius at tipping point is ( as per I calculated ) = c ( 3/8 . pi . density . G )^1/2 As we can see , it is dependent only on density & inversely proportional to sqr root of density so , to answer your question , I just need to put in value for density of cat Idk what Is the value for density of cat though 😂 I hope this is enough Love your videos btw , so much helpful & interesting

@PieterPatrick 6 жыл бұрын

Please drown a cat under water to find out its volume. :-)

@theinsanitypenguin 6 жыл бұрын

density will most likely be close to 1(kg/L) = 1000kg/m^3 due to the fact that most animals are made mostly out of water

@chaitanyaparanjape7837 6 жыл бұрын

Insanitypenguin Oh yeah right , Thnks!!

@maxsch.6555 5 жыл бұрын

0:47 Lmao that sounds so funny for me as German😂

@laurinkaebelmann6373 4 жыл бұрын

Ja, seine Aussprache ist köstlich amüsant;)

@anshuman7113 3 жыл бұрын

@NearVSMello 4 жыл бұрын

Calculated the schwarzchild radius for my mass - I would have to be crushed so small that comparing me to a hydrogen atom would be like comparing a baseball to the Sun.

@DrakeMagnum 6 жыл бұрын

Great video

@nayhem 6 жыл бұрын

I am disappointed that each slide with a black hole drawn in it doesn’t vanish into it.

@thewitchking84 6 жыл бұрын

0:06 it's "spaghetti", only 1 "g" and 2 "t"s, so it is "spa *ghetti* fication"

@donaldthomson7682 5 жыл бұрын

Thanks for your Input !!! This guy Karl Swartzschild had it all figured out LONG before all this stuff Today about 'Event Horizen' Give the guy his Credid Due and sfarf calling it 'SWARTZSCHILD PERIMITER '

@nilankoor 6 жыл бұрын

This is the one of the very very few minutephysics videos that I actually understood completely.

@xDarkHGx 6 жыл бұрын

Hey minutephysics! After 1 hour of calculations I have got to the value of r= 2.74 x 10^15 m. I'm pretty sure my answer is completely wrong but because I've spent too much time on this one I just want to check. If that's not the answer please someone tell me what I am doing wrong. Have a nice day guys! Love your channel :D

@Neighbour249 6 жыл бұрын

I personally had a radius of 4.033x10^11 and some other guy in the comments had the same, post the mass you found.

@xDarkHGx 6 жыл бұрын

Parpaing Well...I found a mass of 1.84 x 10^42

@xDarkHGx 6 жыл бұрын

Parpaing I first got the mass equation and substituted the r^3 to rs^3 (because in the video there was a hint saying that r=rs) and then after a lot of huge numbers I found this mass that I said. Then I used the rs equation with the mass I've found and got that radius. But you're probably right since another guy got that radius too. Can you tell me what you did? Thanks!

@Neighbour249 6 жыл бұрын

What density did you use ?

@xDarkHGx 6 жыл бұрын

Parpaing I used a density of 1.062 kg/m^3 that I found on a random cat website

@scotthannan8669 6 жыл бұрын

What about the density of very small rocks or witches?

@crazydave9938 6 жыл бұрын

1 witch = an equal mass of wood, or your average duck but taller.

@hexcodeff6624 2 жыл бұрын

You just got the award for only english educational channel which pronounces Schwarzschild's name somewhat correctly.

@soisaus564 Жыл бұрын

*" Hey how's your shield and wife doing? Yeah they're nice "*

@joelhaggis5054 6 жыл бұрын

Ah, I too have a sphereical cat.

@zimautanimation 6 жыл бұрын

If cat become blackhole, does it mean it same as disapear. Since cat almost have zero gravity?

@AntSwift1 3 жыл бұрын

Very small black holes will just detonate because of Hawking radiation

@Hello-bs8dn 3 жыл бұрын

@@AntSwift1 Did you mean disappear? I might be wrong though

@scienceium5233 3 жыл бұрын

@@Hello-bs8dn no they will denote because e=mc2 so the black hole's mass is converted to energy and that cannot disappear and so it will detonate

@Hello-bs8dn 3 жыл бұрын

@@scienceium5233 Ohh okay!

@Adhjie 2 жыл бұрын

@@scienceium5233 self conservation of fmb until big crunchy meal shivers

@MattieCooper10000 6 жыл бұрын

So....the sun....is made out of cookies that my 6 year old can play with?

@toshiro0o 6 жыл бұрын

Can you do a followup explaining the concept of regular black holes (like the Bardeen solution), the Cauchy radius and the possibility of having an expanding universe inside? You could first explain Penrose diagrams and the static de Sitter solution. I think this channel could do with a few more advanced videos like this, even if it's explained mostly with pictures and graphs like now.

@qqq1701 6 жыл бұрын

Could you give a black hole a bunch of stuff to make it less dense and lose its black holeness? It would still have super gravity but lose the ability to stop light.

@Dylanhero1 6 жыл бұрын

So what your saying is add a bunch of not very dense stuff to a black hole in order to make the black hole less dense and "uncollapse". That wouldn't work since the black hole's gravitational strength is more than sufficient to crush anything you add to it and make it as dense at the black hole is, so the black hole's density isn't decreased and it stays a black hole.

@qqq1701 6 жыл бұрын

Ya, I was thinking about it more after I posted and it wouldn't work. There wouldn't be anything to see anyway. Just a very dense ball.

@patrickjacobs6875 6 жыл бұрын

The black hole actually loses mass by radiation named after Stephen Hawking. In a very slow process the black hole radiates energy as any black body object would, such as the sun does every day. However, since the black hole is massive but infitesimally small, it takes an extremely long time. Eventually, however, it will disapate.

@SlippyLegJones 6 жыл бұрын

I'd imagine the reason for that is that if you add a not very dense object to a black hole it would have the ability to condense the object more. Likely condense it down past it's Schwarzschild radius creating more black hole (obviously since you're adding a not dense material/object it would increase the size by nearly nothing) but that's just a guess.

@luongmaihunggia 6 жыл бұрын

Adding mass into black hole would only increase it mass and can't decrease it density +1 sin for asking stupid question *ding!*

@suwinkhamchaiwong8382 6 жыл бұрын

"The first 314..." I see what you did there. ;)

@goneutt 6 жыл бұрын

You're going to have to revisit that bit about neutron star collisions. They detected the gravity waves from a collision, and instead of two neutron stars collapsing into a black hole, they exploded into a shower of heavy elements.

@FlorenceSlugcat 3 жыл бұрын

Thank you. I have been looking for a tutorial to hide my cat from my boyfriend for so long. Now I can finally compress it to microscopic size. That hydrolic press will finally become handy after all!