The amazing thing is if the string went around the entire known universe with a diameter of 46 billion light years - and you pulled it out 2 meters in every direction you would still only need an extra 12 and a bit meters.
Imagine though if it went around the entire universe then some kid dropped it because the ice cream van was coming around it would take you like millions of years to realize that the string had dropped, by which time he would've paid for and finished his ice cream and picked up the string again MIND BLOWING STUFF, HUH LOL
My Tad's car had some running along the windshield for a few weeks that was too tight to get off. Eventually a 7'5" man came and held it up to his chin for a few seconds before leaving with the string. That was the weirdest thing I've ever seen.
I've just come across this channel and I am chuffed. Rob and Deane opened up my mind to such wonder, day after day for years. Seeing them now is like catching up with some long lost uncles.
I liked this one. Something counterintuitive explained by math. Those thinking the world is flat-start walking in a straight line until you fall off. Have a friend make a video of how far you can walk before plummeting to wherever.
@@mikespearwood3914 it's not a lie, how about you try to walk on water or sail it to Antarctica ? If you can then you will be escorted back by the military by force. Talk about freedom. If you really think they care about you , then why do they fine you if you don't vote?
I remember when I assisted in this project. Holding those strings up and coordinating it at the right time was super tricky. I was in Greece at that time and we have to hold those strings up at midnight.
I really love the way he explains it in a casual sense, like "three and a bit" and "2 meters or so" it really lets you focus on the base concepts and not get confused/bogged down on specific numbers, often times simpler really is better in teaching (at least at first)
@@jamie123b Yes, and he explained it well I think kids especially can grasp "three and a bit" better than trying to have them remember several decimal places
The radius of the earth = 6371km Circumference = (2×π×6371) New circumference = (2×π×6371.002) New-old = ~12.5m That's actually amazing! Such a drastic change producing such a small one in the circumference
curvature rate of earth = .666ft per mile squared. Earth going around sun = 66,600mph Gravity discovered in 1666 (666 newtons) The north and south arctic circles are at 66.6 degree latitude. Diameter of the moon = 6x6x60 Surface temperature of Uranus = 6x6x6 Plutos Orbital Velocity = 4.666km/s Speed of sound in knots = 666 earth circumference in nautical miles = 600 x 6 x 6 Mars 1.666 AU from sun Saturn orbital distance 1,426,666,422km The sun is 666 times brighter than venus Longest time a female astronaut has been in space = 666 days.
Such a clear, concise, and excellent explanation done in 2 minutes and 17 seconds...and even had time for a commercial break! Most modern-day UA-camrs need to take a note from him.
Sometimes the algorithm truly blesses me with these gems - also this is one of the simplest yet most mind boggling things ever, and I’ve been watching science and maths related stuff for years.
It's easier to think of it in terms of a square instead of a circle. In fact, draw it on some graph paper. If you wanted to raise the string off the surface of a square planet by a unit, you'd only need 2 units of string per side, regardless of the planet's size. Now think of it as a square with rounded corners. Still 2 units per side. Now round those corners so far that the rounded bits meet and it becomes a circle. Guess what? Still 2 units per side.
That's am amazing way of simplifying it! Oddly enough, I was trying to wrap my mind around it just the other day, thinking back how our maths teacher tried to explain it to us by creating a huge circle on the school ground. Unfortunately, he used yarn, which was quite flexible and defeated the purpose.
Just quickly Googled, the diameter of the Earth is about 7,900 miles, so is it really that surprising that adding 12 feet or ~0.0023 miles to the total diameter constitutes a relatively small increase in circumference?
The most fascinating part about this for me was the realization, that it doesnt matter whether you wan to extend the cord to fit a space of two metets two a tin can or to earth, either way you will need the exact same amount of string :o
The problem here is your assumption that R / (R+10) is a constant is incorrect. Note: 2 / (2+10) = 2 / 12 = 0.167. Note: 100 / (100+10) = 100 / 110 = .909. Can you do this? It is not a conundrum, just an assumption that believing that because R / (R+10) seems to be a constant, it is NOT a constant when putting real numbers in there. Also, you have to use real measurements. The usage of 6.28 feet in your video is incorrect. How did you come up with feet if you cancelled out R? Try the entire calculation using feet (convert miles to feet first), then see what you get. Sorry to burst your bubble.
Hey Deane and Rob. If you have a chance to do it over again, make sure you pull the knotted string one way and then the other to demonstrate that it is a loop. :-D
Only just finding this program, and boy are these great. Simple execution but interesting and thought provoking. If these aired in Canada it would of been one of my favorites growing up.
no you dumb fuck it's 2 different things. when you're saying "WOULD'VE" it's a fucking contraction of WOULD HAVE you dumb shit....of course means of course you'll do something....there's no fucking verb in there
Length of string required to go all the way around the Earth L1=2 pi r (where r is the radius of the earth ) Length of string required to go all the way around the Earth and 2 meters higher L2= 2pi (r+2) =2pir +4pi Extra string needed L2-L1= 4 pi ~ 12 and a bit
Figured this out with a bloke at a wedding the other day on the back of a napkin. Smart choice to seat the engineers next to the physics teachers, keeps them away from the normal people.
At an est. 40million metres, he now needs to return to shop to buy 12.6 more metres? Dingbat.. Say a ball has 50m of string, thats 800580 balls. This man had a lot of balls.
One of my favourite child book series was Encyclopaedia Brown, a really smart kid detective. I think he was once asked if you could walk around the surface of the earth how much farther would your head travel versus your feet. Stupid me once worked out the world circumference and then worked out the extra world circumference and got the difference. Why didn’t I just do it Robs way? Doofus.
Reminds me of an other 'string-around-the-world'-question. If you loop a (non-elastic) string tight around the Earth (so you can't lift it from the ground) and then add 1 meter (3 ft and a bit) of string; if you pick up the string with two fingers, how high do you have to lift your fingers holding the string so that it is taught again? Only one point of the string is lifted up, contrary to the case in the video where all of the string was lifted.
That feels really hard to answer, considering there isn’t a true equation for ellipse circumference. No idea how you’d solve that besides trying to find a formula that gets close
@@monhi64 It doesn't become an ellipse, it's a partial circle with two straight bits that come to a point. If you hold your eye next to the lift-point, the two straight bits seem to stretch to the horizon on either side.
I am pretty sure you wouldn’t have to add any string as the elasticity of it would easily compensate. Now that would be a good question, what would be the least elastic material you could use that wouldn’t require adding more to it?
In case anyones wandering. The '3' he mentioned is actually 3.141592... or π. The circumference of a circle is 2πr or πd, so its the diameter times 3 and a bit
Er.. True but you can't apply that to the Earth. The stated diameter of a spherical Earth is 7,917.5 miles - No one has actually measured that distance with a physical empirical measurement.
Santiago, Rob is correct (as always :), the circumference of a circle is 2 π r If you increase the radius by say 2 metres then the new circumference is 2 * 3.14 * 2 = 12.56 m longer.
Exactly. Say the diameter of any circle is X. The circumference is therefore 3.14X (I can’t make the pi symbol). So if you increase the diameter by 4 you get 3.14 (X+4) which is 3.14X. + 12.56.
My grandad died holding the string over the Atlantic Ocean. Fought a kraken that thought the string was spaghetti and tried to eat it. Not on his watch it wasn't. RIP Poppop, your sacrifice will not be forgotten
Uncle Creepy What I don’t understand is why he has to add the length when all that has to be done is lift the rope all across the globe. I mean why should it fall short if lifted?
Flight sim ZM he said to imagine as if the rope was tight all the way around, basically saying you couldn’t lift it unless there was slack/extra length
@@zainhussein1975 by lifting it up, they are holding the string further away from the centre, increasing the radius and thus doubling the diameter, so the circumference - and length of string needed - would also increase.
This is how _all_ math and science should be presented, not just the science that is aimed towards kids; I don't care what level it is - this kind of relaxed, playful and passionate style is highly preferable for literally all levels, assuming of course that the subjects are taken seriously.
When he untied the string at about 1min, I expected it to retract back across the planet flying away like the bag of Magic winds from the spongebob movie.
The math: If the radius of the Earth is R metres, then the circumference of the Earth (and the length of the string) is 2pi*R. Raising the string by 2 metres is the same as increasing the radius by 2 metres. The circumference of that would be 2pi*(R+2). Distribute and you get 2pi*R + 4pi. 4pi is about 12.6
This was by far their most expensive demonstration on the show. Several men died in the process to set up the initial demo, but it was worth it.
It took funding from dozens of nations and 7 years to complete. But the kiddies watching on Saturday morning sure did appreciate it.
RIP to those guys who tried to hold up the string over an active volcano.
It was almost as great a feat as the moon-tarp.
I was there. My job was to hold it up above water, so it won't sink below sea level.
@@plokijum The poor people who would have to cut through a whole mountain or hill to get the string to lay flat.
All those years memorizing digits in pi, when all I could have just said was "3 and a bit".
I take it you didn’t learn the easy way to count either “1, 2, skip a few, 99, 100”.
355/113 should be close enough for anyone. And as a bonus it uses 3 odd digits, twice each.
Darren Bottin when I was in high school 22/7 was close enough.
😂😂😂😂
60 and a bit percent of the time it works every time.
If you guys were wondering how Australians made long distance phone calls in the 80's, watch the next episode where they tie the cups on!
GeekWorthy hey!! that's our secret
😅
Hahaha well done
And it worked too. Organising a teleconference took a bit of organising though.
Damn, you've found the secret to our NBN network! Now everyone will be able to play games with 500 ping!
Props to him for literally tying the string around the world to prove a point, I wish there were more people like him! ❤️
Read my name
@@Collas42 lol
@@Gehrmann_Sparrow haha
@@WiseMysticalTree4 touch grass
Wait really? They actually did tie a string around the world?
Yup, tying a string around the globe and realizing it's actually not what you wanted to do at all.
Sounds like a typical Tuesday afternoon for me.
This show has the perfect australian humor that I like
For me here in Canada it's a typical Monday night, as we are 12 hours behind you.
"Yeah now i'm finally done. Wait... Oh no, not again"
The amazing thing is if the string went around the entire known universe with a diameter of 46 billion light years - and you pulled it out
2 meters in every direction you would still only need an extra 12 and a bit meters.
Well put - Rob
Imagine though if it went around the entire universe then some kid dropped it because the ice cream van was coming around
it would take you like millions of years to realize that the string had dropped, by which time he would've paid for and finished his ice cream and picked up the string again
MIND BLOWING STUFF, HUH LOL
Damn that is incredible!
@@martinkuliza Man... science is beautiful
@@xhappybunnyx
isn't it just
mathematicians around the world have their minds instantly destroyed, turning into vegetables as Australian man calls pi "3 and a bit"
He can't be Australian if Australia doesn't exist
Real mathematicians don't have any problems with that at all because they understand the concept and purpose of approximation.
So do ten-year-olds, who this was for - Rob
@@CuriosityShow
Lol. Awesome.
I'm a mathematician, and I prefer 3.abit over precision in this context. :)
Man, that's one of those things you can do the math on a hundred times, and still not believe.
As long as you don’t tie another string around the world every time you do the math…
@@Kalle72 or we use an elastic band instead
i literally dont get it lol this is some bogus
The only thing that helped me was that you already have all this string, adding 12m would create some slack u could use n I guess it'd be enough
@@nathanmingle7 “the only thing that helps me is accepting that the answer is true”? Lmao
The interesting part is that you also need 12 meters to do the same around an apple, or any other round item regardless of its diameter
Don’t forget the bit as well
Yeah that's interesting
I can't believe this
@@himynameisben95 you don't need to believe it, it's a mathematical fact
@@himynameisben95 you can just imagine it, I did it too and now I know why and how it works..
PI = 3.a bit
cute
Accurate
more accurate if you use 3.a bitttttttttttttttttttttttttttttttttttttt
😂
Don't mention pi around kids, they want to eat it!
ah, that explains the length of string running across my back garden
My Tad's car had some running along the windshield for a few weeks that was too tight to get off. Eventually a 7'5" man came and held it up to his chin for a few seconds before leaving with the string. That was the weirdest thing I've ever seen.
I'm hungry for 3 and a bit with sauce.
@BENJAMIN FRANKLIN than*
Vsauce?
Toast I’ll have some apple-three and a bit please.
I've just come across this channel and I am chuffed. Rob and Deane opened up my mind to such wonder, day after day for years.
Seeing them now is like catching up with some long lost uncles.
My pleasure - subscribe at ua-cam.com/users/curiosityshow for lots more - Rob
Just throwing on a playlist with Auto-Play on and its entertainment for hours. Love their personalities and the DIY aspects.
I’m both impressed by the idea conveyed, but also the simplicity of how it was explained. Bravo.
Is this string theory?
yes
SkrilHexNukehul
Bravo 👏
Nope. String theory is a theory about what elementary particles are made out of.
@@umnikos wooosh
@@skril733 Maybe he knew it was a joke, and anti-joked your joke. You would need to be WOOOOOSHed yourself.
I liked this one. Something counterintuitive explained by math. Those thinking the world is flat-start walking in a straight line until you fall off. Have a friend make a video of how far you can walk before plummeting to wherever.
Their bullshit logic is Antarctica is actually an ice wall surrounding the edge. (Don't ask me where the Arctic is supposed to be in their model.)
@@mikespearwood3914 it's not a lie, how about you try to walk on water or sail it to Antarctica ? If you can then you will be escorted back by the military by force. Talk about freedom. If you really think they care about you , then why do they fine you if you don't vote?
But Earth is a dodecahedron.
@@themerchant2579 Mate, you couldn't body slam a penguin. The earth is not flat, son. The only thing here that is flat is your comprehension.
The globers are steeped in such an amazing amount of cognitive dissonance, it’s FLAT-out comical!
"3 and a bit, times 4, is 12 and a bit" straight facts 🤯
I don't think he actually put that string all the way around the world...
U don't say
What makes you say that
proof
Reeffeeder
Lies
I mean obviously he would have had help.
I really love when he said "3 and a bit" it shows that he is a great teacher
That so clearly explained! I was dumbstruck when the figure of 12 meters was first mentioned
Many thanks, lots more at ua-cam.com/users/curiosityshow - subscribe if you haven't - Rob
Pie is 3 and a bit.
Middle finger to people memorizing 17,000 digits of pie lol.
"Pie"
“17,000”
"Quahtasy"
No, he didn't.
It's an assumption.
Yum
The "you-can't-handle-pi-yet" stage of education
Just the effort to go around the world and place the string is alone very amazing
I remember when I assisted in this project. Holding those strings up and coordinating it at the right time was super tricky. I was in Greece at that time and we have to hold those strings up at midnight.
And the only way you could make a call to co-ordinate everyone was to tie the cups on the ends.
I really love the way he explains it in a casual sense, like "three and a bit" and "2 meters or so" it really lets you focus on the base concepts and not get confused/bogged down on specific numbers, often times simpler really is better in teaching (at least at first)
I always loved this bare bones logically explaining a concept.
If the video didn't give you an aneurysm the comments sure will.
@@Natsukashii-Records Huh? The comments seem mostly like people making jokes
The three and a bit is really 3.14159 I.e. Pi
@@jamie123b Yes, and he explained it well I think kids especially can grasp "three and a bit" better than trying to have them remember several decimal places
Bit is an official unit of measurement for aussies and brits 😀
Works for telling time too 😂
If a bit is too much, use a smidge instead.
Rick Sanchez137A so's bites and gigabites
Butt is a unit of measurement, so I'm not gonna assume that's wrong.
@@raezor82 as in a butt load?
The radius of the earth = 6371km
Circumference = (2×π×6371)
New circumference = (2×π×6371.002)
New-old = ~12.5m
That's actually amazing! Such a drastic change producing such a small one in the circumference
curvature rate of earth = .666ft per mile squared.
Earth going around sun = 66,600mph
Gravity discovered in 1666 (666 newtons)
The north and south arctic circles are at 66.6 degree latitude.
Diameter of the moon = 6x6x60
Surface temperature of Uranus = 6x6x6
Plutos Orbital Velocity = 4.666km/s
Speed of sound in knots = 666
earth circumference in nautical miles = 600 x 6 x 6
Mars 1.666 AU from sun
Saturn orbital distance 1,426,666,422km
The sun is 666 times brighter than venus
Longest time a female astronaut has been in space = 666 days.
What’s really crazy is that the area of the circle inside the string would increase by about 80 million m^2 (80 km^2) with just 12.56 m of string
How many sheets of bubble wrap would you need to wrap a flat Earth? Glad you asked. The answer is twelve and a bit, and here's why...
Mmmmyyyddyyuuuyyyy BIIIIIITITTTSTSTTSTSSTTSSVSSSHSHSSHSHSHSHSHSS
(A Bit) -> ○○
If they’d shown this kind of video in my maths class, many hours would’ve been saved
Amazing explanation in just 2 and a bit minutes
I see what you did there 🤣🤣
I just can’t believe he has a string around the whole world
The explanation was so easy to follow and intuitive!
I loved this show as a kid and I can learn from it even today!
I learned more about circles and Pi in this short two minute video than the years I’ve spent at school learning about it!
Such a clear, concise, and excellent explanation done in 2 minutes and 17 seconds...and even had time for a commercial break! Most modern-day UA-camrs need to take a note from him.
These are wonderful. Thank you.
My pleasure. Subscribe at ua-cam.com/users/curiosityshow for hundreds more segments - Rob
TheSlave1Taxi Great name. How much is cab fare to Tatooine? Carbonite slab was a bit too big for the overhead compartment of the plane...
Finally the question answered as to whether Rob is very tall or Deane is very short...
hehe
Sometimes the algorithm truly blesses me with these gems - also this is one of the simplest yet most mind boggling things ever, and I’ve been watching science and maths related stuff for years.
Glad you enjoyed it - Rob
@@CuriosityShow r-rob? You’ve come back to the video to grace us with your presence after about 3 years!
@@CuriosityShow i wasted all my time getting to 50+ digits thanks to "3 and a bit"
jokes aside this was a very cool video
It's easier to think of it in terms of a square instead of a circle. In fact, draw it on some graph paper. If you wanted to raise the string off the surface of a square planet by a unit, you'd only need 2 units of string per side, regardless of the planet's size.
Now think of it as a square with rounded corners. Still 2 units per side.
Now round those corners so far that the rounded bits meet and it becomes a circle. Guess what? Still 2 units per side.
That's am amazing way of simplifying it! Oddly enough, I was trying to wrap my mind around it just the other day, thinking back how our maths teacher tried to explain it to us by creating a huge circle on the school ground. Unfortunately, he used yarn, which was quite flexible and defeated the purpose.
Yeah I like this much better
Sure 2 units per side of a circle. "per side" of a circle.
@@avi88 a circle has infinite sides so it still works
@@number42iscool So, then as per Cathode Ray Kobold, the answer would be 2Xno. of sides, so 2Xinfinity, and not 4pi. See how that doesn't work?
Just quickly Googled, the diameter of the Earth is about 7,900 miles, so is it really that surprising that adding 12 feet or ~0.0023 miles to the total diameter constitutes a relatively small increase in circumference?
The most fascinating part about this for me was the realization, that it doesnt matter whether you wan to extend the cord to fit a space of two metets two a tin can or to earth, either way you will need the exact same amount of string :o
This is giving me brain-freeze
The problem here is your assumption that R / (R+10) is a constant is
incorrect. Note: 2 / (2+10) = 2 / 12 = 0.167. Note: 100 / (100+10) =
100 / 110 = .909. Can you do this? It is not a conundrum, just an assumption
that believing that because R / (R+10) seems to be a constant, it is NOT a
constant when putting real numbers in there. Also, you have to use real
measurements. The usage of 6.28 feet in your video is incorrect. How did you
come up with feet if you cancelled out R? Try the entire calculation using
feet (convert miles to feet first), then see what you get. Sorry to burst
your bubble.
"I've just tied a string around the earth, problem is that's not what I meant to do"
Well shjt man, how did you fuck that one up?
There is reason to use a couple more decimals of pi, add two more decimals and it rounds up to 13.
The fear of the strings pulling away from him untying it 🤣
It's 02:30 on a week night and I have no idea why I watched this. Goodnight.
Hey Deane and Rob. If you have a chance to do it over again, make sure you pull the knotted string one way and then the other to demonstrate that it is a loop. :-D
Curses, never thought of that - Rob
LOL....... but of course
Only just finding this program, and boy are these great. Simple execution but interesting and thought provoking. If these aired in Canada it would of been one of my favorites growing up.
Many thanks - lots more if you subscribe at ua-cam.com/users/curiosityshow - but you may already be there- Rob
Firestorm Danger Dash **would’ve lol
@@UFCMania155 've course
no you dumb fuck it's 2 different things. when you're saying "WOULD'VE" it's a fucking contraction of WOULD HAVE you dumb shit....of course means of course you'll do something....there's no fucking verb in there
@@UFCMania155 ua-cam.com/video/cVUbpTFkDdo/v-deo.html
This was actually very surprising even though i know the math. Wow
Thanks, Lots more at ua-cam.com/users/curiosityshow please spread the word - Rob
Big ups to all those brave bastards that had to hold up the string along the oceans somehow
We’ve come so far as a species...
Many thanks, lots more at ua-cam.com/users/curiosityshow subscribe if you haven't - Rob
So much easier when you can visualise the problem.
I wish there was a way to represent three and a bit mathematically.
τ/2
This broke my intuition.
That was the point of the entire exercise. ;-)
This man asking the real questions.
“And a bit” the most precise of all mathematical measurements.
Length of string required to go all the way around the Earth
L1=2 pi r (where r is the radius of the earth )
Length of string required to go all the way around the Earth and 2 meters higher
L2= 2pi (r+2) =2pir +4pi
Extra string needed L2-L1= 4 pi ~ 12 and a bit
False. How can you get the string past the international security force guarding the edge?
Just put your tin foil hat on and you'll slip straight past.
You bribe them.
well ............ you can because they grew up watching curiosity show so they know it's all done for science and they let him through
Figured this out with a bloke at a wedding the other day on the back of a napkin.
Smart choice to seat the engineers next to the physics teachers, keeps them away from the normal people.
At an est. 40million metres, he now needs to return to shop to buy 12.6 more metres? Dingbat..
Say a ball has 50m of string, thats 800580 balls. This man had a lot of balls.
When you wear a shirt inside-out, the entire universe except you is wearing that shirt.
Damn, wish I could have had this dude as a teacher
I rate this video a 3...and a bit
Out of 3 and a bit I hope
Please remove the string around my house.
Thanks for the video and the explanation because me and my neighbors were wondering who the hell ran the string through the subdivision.
Lol
We finally found the guy from the math problems
One of my favourite child book series was Encyclopaedia Brown, a really smart kid detective. I think he was once asked if you could walk around the surface of the earth how much farther would your head travel versus your feet.
Stupid me once worked out the world circumference and then worked out the extra world circumference and got the difference.
Why didn’t I just do it Robs way? Doofus.
Not at all. Sounds like a smart kid to enjoy that book and try to answer the question - the very thing we were trying to encourage - Rob
@@CuriosityShow
That it did my very good friend, that it did.
Cool, and a bit. 👍🇦🇺
Many thanks - please spread the word - Rob
Well I wasn't expecting this video to be a maths puzzle but it was a good one😁😁
I did this myself and got it right. It only took me 20 minutes and several curses directed at my high school math teacher.
I actually thought this was made in 2008 until I checked the description.
Reminds me of an other 'string-around-the-world'-question.
If you loop a (non-elastic) string tight around the Earth (so you can't lift it from the ground) and then add 1 meter (3 ft and a bit) of string; if you pick up the string with two fingers, how high do you have to lift your fingers holding the string so that it is taught again? Only one point of the string is lifted up, contrary to the case in the video where all of the string was lifted.
Well I wanna know the answer, but I don't know how to apply the question to the math.
That feels really hard to answer, considering there isn’t a true equation for ellipse circumference. No idea how you’d solve that besides trying to find a formula that gets close
@@monhi64 It doesn't become an ellipse, it's a partial circle with two straight bits that come to a point. If you hold your eye next to the lift-point, the two straight bits seem to stretch to the horizon on either side.
Well I want to know the answer as well.
@@DreadX10 like a tear drop shape right? Surely there are formulas to solve that
Shaggy!!! Is that you???
😄 I was thinking the same thing
I am pretty sure you wouldn’t have to add any string as the elasticity of it would easily compensate.
Now that would be a good question, what would be the least elastic material you could use that wouldn’t require adding more to it?
Dried butter
In case anyones wandering. The '3' he mentioned is actually 3.141592... or π. The circumference of a circle is 2πr or πd, so its the diameter times 3 and a bit
I just think it's amazing he wrapped it around the Earth.
14 Flat Earthers thumbed down this video.
Pi - 3.14, diameter * pi = circumference
Er.. True but you can't apply that to the Earth. The stated diameter of a spherical Earth is 7,917.5 miles - No one has actually measured that distance with a physical empirical measurement.
@@DivergentDroid
7915.5 * 3.14 = 24,860 mile circumference of earth + 12 meter
They don't have to for this to hold. If you watch, you will realise that the circumference of the Earth is not actually important here - Rob
Santiago, Rob is correct (as always :), the circumference of a circle is 2 π r
If you increase the radius by say 2 metres then the new circumference is 2 * 3.14 * 2 = 12.56 m longer.
Exactly. Say the diameter of any circle is X. The circumference is therefore 3.14X (I can’t make the pi symbol). So if you increase the diameter by 4 you get 3.14 (X+4) which is 3.14X. + 12.56.
I think with a string all around the world you'd probably have enough flexibility in it to lift it 2 meters without adding any more string.
Definitely
My grandad died holding the string over the Atlantic Ocean. Fought a kraken that thought the string was spaghetti and tried to eat it. Not on his watch it wasn't.
RIP Poppop, your sacrifice will not be forgotten
Grandfatherless
@@auahahahahhaa3150 at least I'm not maidenless
lol....ahhh..h..h
3 and a bit has to be the best description of Pi I’ve ever heard.
How long is a piece of string? 12m it seems 🤪🤣
Actually, it's 12m and a bit.
Thanks for sharing this - good maths lesson!
A pleasure - Rob
Damn this guy is 6 foot 8? Lmao never thought
No shot you actually went around the earth with a string
Hi. I am lost. What hidden that I fail to see here?
What do you mean what’s hidden? What got you lost?
Circumference = Pi x diameter
He added 4m to the diameter which increased the circumference by 12.6m
Uncle Creepy
What I don’t understand is why he has to add the length when all that has to be done is lift the rope all across the globe. I mean why should it fall short if lifted?
Flight sim ZM he said to imagine as if the rope was tight all the way around, basically saying you couldn’t lift it unless there was slack/extra length
@@zainhussein1975 by lifting it up, they are holding the string further away from the centre, increasing the radius and thus doubling the diameter, so the circumference - and length of string needed - would also increase.
Him: undoes the knot
Me: 🤯
This is how _all_ math and science should be presented, not just the science that is aimed towards kids;
I don't care what level it is - this kind of relaxed, playful and passionate style is highly preferable for literally all levels, assuming of course that the subjects are taken seriously.
Mind officially blown! Such a simple explanation!
A nice one! A campus colleague told me 30 years ago a variant of this riddle. It's simple math, but it's surprising!
I remember that i walked outside and was like wtf did someone tie a string around the world
😂😂😂
Round of applause for the extras, too!
This is a better explanation of geometry than my anything I got in high school
When he untied the string at about 1min, I expected it to retract back across the planet flying away like the bag of Magic winds from the spongebob movie.
I don’t know why this was recommended to me but I’m not complaining
Finally after three long years this was recommended to me
The math:
If the radius of the Earth is R metres, then the circumference of the Earth (and the length of the string) is 2pi*R.
Raising the string by 2 metres is the same as increasing the radius by 2 metres. The circumference of that would be 2pi*(R+2). Distribute and you get 2pi*R + 4pi. 4pi is about 12.6
All of us are just awake at 1am super baked, watching an old Australian kids show, and I wouldn't have it any other way
Remembered why I hated math class in under a minute, thank you. Gonna go Hulk my head through a wall now
The string went right through my house
the man just cut the clouds just for this, what a damn legend
The fact he put this string AROUND THE EARTH blows my mind!