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The Rocket Equation: Mathematician vs Astronaut

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Huge thanks to Chris Hadfield and their amazing team for making these videos possible. chrishadfield.ca/
You can watch just my rocket equation derivation without the coolest person in the world getting in the way. • The Rocket Equation: a...
You can go and watch Lucie Green's first two video with Chris Hadfield right now, the third one with 'aurora surfing' is out in a week.
• How the Space Shuttle ...
• The Story of Space Shu...
Here is my previous video with Chris where we talk about Orbital Mechanics.
• Orbital Maths at NASA ...
Our trip to NASA was organised by the fantastic folks over at Cosmic Shambles.
cosmicshambles...
/ cosmicshambles
With thanks to NASA and the team at the Kennedy Space Center Visitor Complex via agreement with Trunkman Productions Ltd and The Cosmic Shambles Network. To discover more about the KSC please visit www.kennedyspa...
Free resources for teachers!
We have a complete guide to the mathematics in this video as well as some student worksheets and activities.
think-maths.co...
CORRECTIONS
- One fantastic correction from Dogan Erbahar which I will paste a copy of here:
"When equating the momenta you already put the minus sign in front of v_e. But then at the end you are again substituting on the equation. The resulting equation is correct but that minus sign is there not because of v_e. It is there because your dm is negative that your rocket is losing mass. So should be placed in derivation."
- Let me know if you spot any other mistakes!
Thanks to my Patreons whose generous funding I used for a vacation to Cocoa Beech Florida NO REFUNDS.
(Or maybe everyone involved donated their time, covered their own expenses and my Patreons only had to pay for that flip-chart. True story: I bought that flip-chart in the USA as it seemed silly to fly one over from the UK and afterwards the NASA outreach team kept it, which I think means it officially 'works at NASA'. That flip-chart now has a cooler job than me.)
Here is a random subset of those fine Patreon People:
Baadrix
Stephen Tierney
Erin Eldridge
Christian Gruber
David Wagner
Richard Fourie
Nicholas Koceja
Kristian Joensen
Andy B
Jordan Scales
Filming and editing by Trunkman Productions
Extra help during the shoot thanks to Melinda Burton and Joanna Gostling
Flipchart by Matt Parker
Audio by Peter Doggart
Music by Howard Carter
Design by Simon Wright and Adam Robinson
MATT PARKER: Stand-up Mathematician
standupmaths.com/

Опубликовано:

29 авг 2024

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Комментарии : 792

@oslier3633 4 года назад

Engineers: let’s add 30% for rounding error.

@rjmorpheus 3 года назад

Factor of safety my dude :D

@kelly4187 3 года назад

That's me playing Kerbal Space Program, spending 2 hours planning a mission on paper and then having it explode in 2 minutes.

@alidurrani4645 3 года назад

thats like the maximum overloading condition

@reactorfour1682 3 года назад

Oslier that’s me calculating delta v in KSP.

@MrFijiBoySako 3 года назад

e=pi

@yeeterdeleeter 4 года назад

"8000/3500 ... that's about 2" "and e is 2.7 ish" As a physics student, the amount of rounding going on in this video was just perfect

@yeeterdeleeter 4 года назад

and in the next sentence e was rounded to 3. now it is truly perfect

@cvkline 4 года назад

In my astrophysics class, the professor was an absolute expert at this kind of rounding. Pi on top, 4 on the bottom, enh, just cancel them both. Ooh, this integral is hard, but this sin term won't change much across our limits of integration, so enh, just call it a constant and pull it out of the integral and now it's just a polynomial. Once he derived Chandrasekhar's limit from the basic physics laws, and in about half an hour of showing us all the leaps of thought, wound up with a numeric value that was surprisingly close to the actual value, within 25% or so. He'd always finish out these derivations by comparing what he got to the accepted value, and then say "Enh, that's close enough for government work." [Edit: 25% is probably an exaggeration, he was probably further off than that. Another of his favorite quips was "after all those approximations, shortcuts, and simplifications, if I can get within a factor of 2 of the right value, that's pretty much bang-on as far as I'm concerned."]

@CesarTheWelfareCaptain 4 года назад

@@cvkline Absolute CHAD teacher you got

@appa609 4 года назад

Charley Kline astro guys are always pros at this. π? 1 is close enough lol

@andymcl92 4 года назад

@@cvkline For one Astronomy class in first year, we had to memorise 20 equations and be able to derive 10 of them. The derivation for tidal forces we got shown went over several pages and used multiple subtle approximations. The recommended textbook for that year's astronomy just differentiated the equation for gravitational force, and then swung the dr to the other side. 3 lines.

@alperenerol1852 4 года назад

Me trying to sleep... My brain at 3am: inaudible maths noise while Chris talks about rocketry

@alhadinon 4 года назад

Me, trying to concentrate on both audio channels at once: 😊 ☺ 😐 😳 😵 🤯 🤕

@jordanwhitlock2215 3 года назад

Don’t forget the music too

@jackeea_ 4 года назад

Finally, I've seen a "e is more or less 3" in the wild!

@MubangaDNB 4 года назад

So e “is more or less” Pi

@rednammoc 4 года назад

It's the Parker "e".

@captainoblivious_yt 4 года назад

E = π

@angelmendez-rivera351 4 года назад

Oh, you haven't seen anything. There are certain calculations in cosmology in which physicists round e = 10.

@sleepydog9968 4 года назад

@@angelmendez-rivera351 madness

@andrewbergspage 4 года назад

"and you're just a bit of metal and flesh…" Chris Hadfield, bionic man

@Anvilshock 4 года назад

Gladly, they didn't have to rebuild him for six million dollars.

@DonutFlameFPS 4 года назад

"Let's say 8..." "8 is an easy number" "...thousand"

@VirtuelleWeltenMitKhan 4 года назад

haha

@peterknutsen3070 4 года назад

Still an easy number. The “...thousand” part is just an order of magnitude issue.

@arvindsrinivasan424 4 года назад

Peter Knutsen spoken like a physicist

@Mad_Elf_0 4 года назад

It's a very rough estimate. I can't remember where the difference starts to be meaningful, but that's the wrong equation for gravitational potential energy above a certain height.

@vincentpelletier57 4 года назад

@@Mad_Elf_0 It depends how far up you are compared to the radius of the Earth. If you are 400km up, and the radius is 6371km, then the approximation is still reasonably good. But if you try to go to the Moon (384 400 km) then that "mgh" bit is completely wrong.

@neonblack211 4 года назад

I like how "Oiled Cement" is the best analogy he could come up with for near frictionless space flight

@neonblack211 4 года назад

@John Smith thats what i said

@senorlopez1412 4 года назад

@John Smith yea

@matthewrossilini5808 4 года назад

Yeah i kinda raised an eyebrow at that. Haha.

@Norsilca 4 года назад

Sounds like he's trying to convey that it's still got some vibration to it, but a surprisingly small amount

@webby2275 3 года назад

@@Norsilca Possibly so! However, untextured concrete actually has a very low friction coefficient. It gets textured in order to combat this, mostly using float or broom finishes. I'd say that this probably wasn't what he had in mind making the comment, but it works even better than at first glance!

@BeardyBaldyBob 3 года назад

For anyone who is interested... given it cost approx $54,500 per kilo for the space shuttle (once you add in the R&D, vehicle & program costs etc.), that's $54.50 per gram. The mass of a righteous moustache like that sported by Chris is approx a third of a gram, thus, it cost NASA about $18.17 to fire that bristly lip warmer into the void each trip 👍

@leogama3422 Год назад

That's why astronauts are required to go to the bathroom just before launch

@tparadox88 4 года назад

I had a late night and an early morning and I was watching this on the bed after work so I dozed off for a moment and then I opened my eyes and saw Chris looking directly at the camera saying "you're lying on your back." and I had a bit of a panic moment.

@CrimsonEclipse5 4 года назад

PoV: Chris Hadfield has kidnapped you and strapped you on to a rocket.

@miratparmar6779 3 года назад

That was hilarious, thank you for sharing

@leogama3422 Год назад

How was the launching?

@EmanuelsWorkbench 4 года назад

Chris is one of the nicest guys. So approachable and friendly. I pleasure to work with when I did work with him a decade or more ago!

@bhaveshjaat4737 3 года назад

What work you did with him

4 года назад

"That's actually what astronauts fly on. - Maths." Should be a t-shirt.

@luisgeniole369 4 года назад

"From the wheel to the skyscraper, everything we are and everything we have comes from a single attribute of man - the function of his reasoning mind."

4 года назад

@@thanasispapadopoulos7922 in France "maths" is most commonly used, for "mathématiques" (plural). Though some people use "mathématique" (singular), like Cédric Villani, who is known for loving old fashioned behaviour and style. The plural seems right to me, at least until the unification is complete ! :) en.wikipedia.org/wiki/Langlands_program

@SachAlvarez 4 года назад

ok nerd

@coolfred9083 4 года назад

Maybe the US edition could say math, but maths is not incorrect either.

@user-bj3iu5bv2w 3 года назад

"That's actually what astronauts fly on. -Meth." Would sell better though!

@kennethbatstone 4 года назад

I'm deaf in one ear. I had to watch this twice and wear my headphones the wrong way round. It was worth it.

@shadowseek27 4 года назад

rip man

@ucanhtranvu1554 4 года назад

Sorry to hear that. Matt has a video with just maths audio in the description if you need it. :D

@brendanmay9585 4 года назад

me too

@mathsandsciencechannel 4 года назад

Yeah

@ramen_emperor5125 4 года назад

respect

@daniele_93 4 года назад

Sad fact: that 10-15% of "payload" is actually about 90% structural components of the stages. Only about 1-2% of the total initial mass is the real final payload.

@jacksonmacd 4 года назад

I was wondering about that, too.

@_aullik 4 года назад

@Jason Bowman Well it was before spaceX got so cheap. Now is somewhere along the lines of $2.5k per kg.

@General12th 4 года назад

@Jason Bowman The price has gotten slightly lower.

@zapfanzapfan 4 года назад

If the weight of the Shuttle itself is counted then about 5% or the starting weight reached orbit. Those 450s isp engines are awesome.

@_aullik 4 года назад

@@zapfanzapfan Those 450 isp engines are actually pretty stupid as they cannot lift the vehicle by themselves. So you always need those massive SolidMoneyBurners To get you up there.

@georgplaz 4 года назад

3:25 I love how Chris takes the battle by pushing the camera too far from the whiteboard, making it impossible to read 😂

@umchoyka 4 года назад

"Your F is steady and your m is going down... your a is going up" It really is

@scottgriswold384 4 года назад

Came here to post this. That's some truth right there.

@matron9936 4 года назад

*Approximately

@Reydriel 4 года назад

lmao

@DoganErbahar 4 года назад

Ok one technical detail. When equating the momenta you already put the minus sign in front of v_e. But then at the end you are again substituting on the equation. The resulting equation is correct but That minus sign is there not because of v_e. It is there because your dm is negative that your rocket is losing mass. So should be placed in derivation. That's how books derive it. (Confuses me also everytime I try to derive in class...) very good video, thank you anyway...

@standupmaths 4 года назад

Well spotted! I’m always loosing track of my negatives (and tend to just make sure I’ve made an even number of mistakes). I’ll add that to the corrections.

@trucid2 4 года назад

Negative infinitecimals? You just broke my brain.

@singularity108 4 года назад

To put in other words, "I don't know how but you used the wrong formula but got the right answer" P.s: Please don't attack me, i know it's not true!

@georgplaz 4 года назад

@@standupmaths don't worry. worst case: the rocket decelerates and the astronauts burn up in the atmosphere

@appa609 4 года назад

Yeah just do it in rocket frame much cleaner.

@aiboffin295 4 года назад

And here I was thinking I’d never understand poetry, thank you Chris.

@aiboffin295 4 года назад

And Matt I guess…

@ampeyro 4 года назад

Poetry with explosions is the best kind of poetry.

@Ennar 4 года назад

Matt: "I am an SI unit kind of individual." Chris: "Yes, you are."

@angelmendez-rivera351 4 года назад

Most people are.

@JM-lc3ki 3 года назад

I want to be patriotic but I just can’t lol, SI is better in every way

@deograciascorderoii7299 3 года назад

What's an SI? Sorry I'm a caveman trying to catch up

@Ennar 3 года назад

@@deograciascorderoii7299 Système international (d'unités), i.e. International System of Units. It's a common standard of measurement units used in all of sciences and most of the world - metric system. Most notably not used in USA.

@IMMORTALSYMPHONIES 4 года назад

Matt: Thats an order of magnitude, lets ignore it. Astronauts: Not so fast dude!

@Simio_Da_Tundra 4 года назад

Nobody: Matt Parker: e^-(8/3.5)≈e^-2≈1/9 I wonder why they say he does math like a physicist

@emlun 4 года назад

I was hoping he'd approximate it as e^-e

@SimonBuchanNz 4 года назад

It's a parker e.

@tekvax01 4 года назад

@@SimonBuchanNz hahahahahah! I was waiting for that one! :P

@ugurcansayan 3 года назад

TBH it is pretty close considering those roundings. XD e^-(8/3,5) = 0,1017013923042268292630681245966135276786674905359158653442327045... 1/9 = 0,1111111111111111111111111111111111111111111111111111111111111111...

@jasonpatterson8091 4 года назад

All of the KSP players are thinking, "Well, if you're going to bother with gravitational drag, you need to factor in atmospheric drag as well."

@technicalfool 4 года назад

Before or after the first few rapid unintentional disassembly events?

@jasonpatterson8091 4 года назад

@@technicalfool During usually. One of those, "Oh, yeah. That's why I'm not going to space today," moments.

@jcota2003 4 года назад

Ah yes the KSP Kracken... Lost many a beautiful rocket to its sometimes janky physics engine... But love the game anyway.

@discretelycontinuous2059 4 года назад

What the hell is *Gravitational Drag*?

@sixstringedthing 4 года назад

That moment when you realise you have totally underestimated how much extra dV you should allow for the atmospheric drag on your latest creatively designed monstrosity...

@ranseus 4 года назад

"When your 'F' is steady and your 'M' is going down, your 'A' is going up." -- Chris Hadfield tells an astronaut dad joke.

@flowerwithamachinegun2692 4 года назад

You can mock me all you want but I don't get it...

@user-un7gp4bl2l 4 года назад

Chris Kacso F=ma. If F is held at a constant value, if m gets smaller then a has to get bigger and conversely.

@Max-ui5gc 4 года назад

And how is that a joke?

@flowerwithamachinegun2692 4 года назад

@@user-un7gp4bl2l I am familiar with the preachings of the Lord Sir Isaac Newton and the 2nd law of motion, but I don't get why is it a [dad] joke

@andymcl92 4 года назад

"Your A is going up." Your "A" is what you're sitting on...

@noterictalbott6102 4 года назад

Imagine visiting and seeing Matt Parker and Chris Hadfield just hanging around. What a treat that would be.

@gnaskar 4 года назад

"The greatest compromise ever made for a spacecraft." Damning with faint praise if anyone ever did.

@HorzaPanda 4 года назад

You missed the most important thing that makes aeroplanes more efficient: They don't have to carry their own oxygen XD

@appa609 4 года назад

Yeah and they get to push off the air behind them. Jet engines get Isp of like 25000 m/s.

@masondaub9201 4 года назад

@@appa609 they don't exactly push on the air behind them. They use the air as reaction mass so they can go for the best ratio of flow and thermal expansion for thrust. Simply not carrying oxygen would only double the efficiency but in reality it's like 10x more efficient

@appa609 4 года назад

Mason Daub We're saying the same thing.

@karhukivi 4 года назад

@@appa609 No you're not! No "pushing" on the air involved.

@ann_onn 4 года назад

@@appa609 Jets and rockets are *more* efficient at lower external air-pressures. Having air behind the jet does not help in any way whatsoever - it prevents the exhaust from escaping. They do not push off anything. That's a silly idea which silly conspiracy theorists claim, when saying rockets can't fly in a vacuum. It's simple. You squirt gas in one direction, and you go in the other. Like, if you fire a gun, you go backwards. It doesn't matter whether the bullet hits anything or not.

@kikivoorburg 4 года назад

What a bad time for my headphones to be broken. :( Edit: ok if I turn on mono audio I can hear Chris clearly and Matt has a video of just the maths available on his second channel! Crisis averted!

@morkmon 4 года назад

just turn them around

@TheReligiousAtheists 4 года назад

*chris-is FTFY

@kikiacademy9628 3 года назад

17:26 that's the face a mathematician would do when hears the word 'combination'. A pure expression of joy.

@AdamSpanel 4 года назад

Mathematicians idea of fun: drawing arrows in RED!

@konstantintsiolkovsky6633 4 года назад

Yes Comrade

@donovanshea3308 3 года назад

Sometimes we spice it up and use orange!

@qu765 4 года назад

You did a good job editing this together, it looks like this all took lots of effort. Great video! Enjoyed it very much!

@petersmythe6462 4 года назад

"As the engines start to bend and warp your vehicle." Sounds like what happens in Kerbal Space Program.

@MattSimmonsSysAdmin 4 года назад

Happens in real life, too! Rockets can be bendy!

@gnuthad 4 года назад

@@MattSimmonsSysAdmin Not just "can be", they really are bendy.

@Sol17Opacus 4 года назад

*M O A R S T R U T S*

@MarkPentler 4 года назад

RUD... 😩

@Hevlikn 4 года назад

Pure Chaos; Chris to camera, the alarm, and Matt muttering in the background. Love it!

@konstantintsiolkovsky6633 4 года назад

Finally someone got around to deriving my equations. Good job, comrades!

@KeritechElectronics Год назад

Very interesting but overtly simplified. as Chris said around 15:00. In this example we only considered a single-stage rocket without parts of considerable mass being jettisoned (SRBs,pwyload fairing, launch abort system, subsequent stages). Works for stratospheric (sub-orbital) rockets, but anything like Saturn or SLS is a lot more complex to calculate. Real damn cool setting, and seeing Chris "Major Tom to Ground Control" Hadfield is a joy for ever.

@spaileam5801 4 года назад

Hey Matt, consider changing the thumbnail for this one! I'm sure someone else was confused like me and thought you'd re-uploaded last week's video. Loving Chris on the show 🎉

@soundninja99 3 года назад

Chris Hadfield is so cool. Just look at all that swagger oozing out of him here

@spookmineer 4 года назад

I applaud you for keeping your composure vs Chris Hadfield. Omg. Thanks Chris for space oddity!

@budmartin8297 4 года назад

I don't want to take anything away from the shuttle's success, but having been born in 61, the highlight of my visit to the cape, was seeing the Saturn V up close. I was awe struck. It was the reason I got an engineering degree. Enjoyed the video!

@kushmandey6880 3 года назад

I derived this equation only once in an online propulsion class. But now I realized it was just a velocity differential that I was calculating. I'm subscribing this channel right away.

@LEDewey_MD 4 года назад

This is a brilliant episode! And perfect timing, because space programs around the world are accelerating us into the future of space travel!! Thanks for this wonderful episode!

@CelloSeanMuller 4 года назад

I watched the maths! “I’ve been told integrate like a physicist!”

@disgruntledwookie369 3 года назад

Oh man I'd LOVE to hang out chatting rocket physics with Chris. He's a proper legend.

@AFGeneralBillyMitchell 4 года назад

Matt called it Cape Canaveral and not Orlando. I’m so proud of him!

@jadebox 4 года назад

Closer. But, KSC is on Merritt Island. :-)

@larto42 4 года назад

Jokes on you. Only one of my headphones work, so I'm left with the maths explanation watching in confusion and wondering what Chris might possibly say in the foreground 🤷🏻‍♀️

@andymcl92 4 года назад

Try switching your audio to mono in the accessibility settings on your phone :)

@LoganStargazer 3 года назад

@@andymcl92 or turn your headphones around.

@creativenametxt2960 3 года назад

@@LoganStargazer that's a very nice joke

@gabedude68 4 года назад

Only 6 mins in and its 3am but gotta say: Great teamwork, making the Math fun and relevant, and Chris Hadfield is a Hero and a Legend, doesn't just do an awesome job, but brings it to the Public and makes it real.. If he's up for it, I want him to get to land on the Moon on a SpaceX Starship, someday.

@Craznar 4 года назад

Sad I can't listen to either of these :( Well - turns out there is barely any 'left' anyway... so I get to listen to Chris.

@gordonrichardson2972 4 года назад

My plug in speakers seem to be missing Matt's part of the channel...

@benh8312 4 года назад

@@gordonrichardson2972 his part is much quieter so that you can focus on Chris if you don't have headphones, and you can hear just Matt if you watch the other video

@Eternalwindschaine 3 года назад

the last 10 seconds gave me the chill. well done.

@SaturnCanuck 4 года назад

Chris Hadfield the greatest Canadian Astronaut ever.

@sethb196 4 года назад

Chris is such a BA. Huge fan. Started talking about Bob and Doug, I was like 'I watched that!' definitely one of my heroes. Great video!

@amomchilov 4 года назад

"The very first human-capable rocket that Al Shepard flew on" Am I missing something? Al Shepard was the first American in space, but the Soviets+Yuri Gagarin beat them to the punch. Was the rocket ready first, even though it was used second?

@ChaineYTXF 4 года назад

Really neat. Nice of Chris Hatfield to have played along

@bmw123ck 4 года назад

19:27 this has to be the best match ever

@manonthebrain 4 года назад

Do you see that flicker in the clouds too?

@RupinChheda 2 года назад

When they split the audio on the two channels, that was awesome.

@McMurica 3 года назад

2 astronauts casually fly in a plane overhead. "oh look there goes bob"

@antivanti 4 года назад

Chris is an inspiring guy to listen to. But I would like to also recommend his son Evan's RU-vid project Rare Earth. Very interesting mini documentaries from around the world.

@SteveLEKORodrigue 4 года назад

Awesome video! I would listen to Chris all day long.

@zehnkleinesturzkampfflugzeuge 4 года назад

You should do two more versions of this video: -one showing Matt as writing up the equation with the voice of Captain Hadfield as telling the details of a rocket ride -one showing Cpt. Hadfield gesturing and we should hear Matt talking delta m and V and e and ln.

@sidosoft 4 года назад

Interesting how during the derivation of the Tsiolkovsky equation, and during the discussion of multistage rockets, Tsiolkovsky is not even mentioned.

@wyattstevens8574 Месяц назад

Fun fact about V_f due to XKCD and his article about orbital speed: for the ISS (in which case V_f is probably more like 7.6 km/s instead of just 8 as shown) and you put on "I'm Gonna Be" while aboard, across the entire song the line "I would walk 500 miles / And... 500 more..." is almost exactly true of you across that time because you go *almost exactly* 1000 miles while the music's playing! About gravity at 13:49, V_f is just right (the 7.6 to 8 km/s figure here) so the ISS stays at the same altitude (about 410 km above the surface) with about 0.9 g's pulling on it. And for anyone curious, Hadfield holds the world record for "first music video in space," which fittingly was of Space Oddity!

@kevwang0712 4 года назад

I was watching this with the built-in mono speakers on a computer monitor and saw that the comments were all talking about the stereo separation, so I went to hook up some speakers. I'm going to watch this again with some earbuds to get the whole immersive effect.

@cjphelp 4 года назад

I love the estimating tricks. "2 and a bit, and e is 2.7ish, ... in the worst case approximation it's 3 to the power of 2, so 9". This idea of being able to go from actual to somewhat estimated to very rough estimation is a really great "number sense" skill.

@isaortruiz 4 года назад

3:31 you got that half right, I AM lying on my back, just not in a rocket ship

@MerrickKing 4 года назад

Mass of fuel is mf... **cries in Engineer**

@88porpoise 4 года назад

Well now I am sad. I have to wait until I can grab a headset to watch this, twice.

@bmw123ck 4 года назад

This is an awesome way to get views on vids hahaha

@sheath420 4 года назад

You can watch the math part in Matt's second channel link in description

@cheaterman49 4 года назад

9:58 Bit of a technical point here (I thought that's where you were getting at) - exhaust speed will vary depending on altitude, because of atmospheric pressure :-) equilibrium basically would be chamber pressure - outside pressure, so the higher the outside pressure, the lower the differential, and the lower the exhaust speed :-) that's why your specific impulse is so much worse at sea level! There's also intricate details about engine bell design to prevent it from blowing itself up when used at lower altitudes (if it's a vacuum-optimized nozzle it'll be bigger and subject to these issues). Great video in any case, love it!

@cataleast 4 года назад

Absolutely love the audio edit of Matt fading out as Chris walks up to the camera :)

@wartab 4 года назад

This video brought back the memories of the Kennedy Space Centre we visited in January. It was extremely impressive to see everything these. Hope you enjoyed it as well, Matt.

@kangourouuu1 3 года назад

Imagine sitting on top of 10 trucks of explosives ready to go off. That's frightening. Now imagine two concurrent explainations of a rocket takeoff in different channels without headphones. Nightmare-inducing!

@josephregan1007 3 года назад

I love how he corrects himself and says “that’s how astronauts fly”. What a great dude

@limbridk 3 года назад

Such a great video. Both Chris and Matt were a delight. 10/10.

@Zeno2Day 4 года назад

Ty for the video. Interesting how the two of you illustrated and rationalized mathematizing of rocket phenomena.

@eL_K_Dee 4 года назад

OK can we all admit we listened to hadfield first and then rewatched to listen to Matt?? dont deny itttttttt

@dantreadwell7421 3 года назад

I love Chris Hadfield. Dude is literally a genius on anything he wants to do.

@cnschu 4 года назад

a few seconds in, and he talks about the "first human capable rocket" and points to an american rocket.

@CarFreeSegnitz 4 года назад

Yes, the US won the race to landing a man on the Moon but lost pretty much every other race. USSR: first satellite, first living thing, first man in space & orbit at the same time, first anything to the Moon, first interplanetary probe. In the late 1950s America was panicked, the USSR was demonstrating they could put a nuclear warhead anywhere in the US and the US had NO response. Up until just a few months ago America was completely dependent on Russia to put American astronauts up. For nine years Russia had the only human launch vehicles that America could access. China would have summarily given them the finger even if NASA came begging. I will grant that the US has won probably the most important modern race that of reusable orbital rockets. Everyone else must build reusable rockets or be left permanently in the dust.

@bulwinkle 4 года назад

I really approve of this collaboration by two of my favourite kinds of people, a thinker and a doer.

@sam-n9v 3 года назад

At 19:21 when the Shuttle engines clutch at full power and the beat drops it's a reminder to me why I love space and engineering.

@Jeff13mer 4 года назад

The video I never thought I needed. Thank you so so so much for making this video. Loved it

@tiemen9095 3 года назад

It is nice how oversimplified this is, but still shows the essence of the problem very much.

@MattH-wg7ou 4 года назад

One of the biggest reasons, in terms of the rocket equation, that jets are so much more efficient than rockets is that they're air breathing. Pulling oxidizer from the air instead of having to carry and accelerate it's own oxidizer. But yea not having to fight gravity without the benefit of lift obviously plays a role as well!

@xbzq 4 года назад

You can switch channels on Desktop by going into DevTools on Chrome or Edge and then pasting the code found here in the console. Then hit Enter. Always hit Enter. Then type left(); (then Enter) or right(); (then Enter) to select a channel. stereo(); selects regular stereo. mono(); makes both channels the same. wide(number); will make it towards mono for 0 1. gain(l2l, l2r, r2l, r2r); will mix the channels any way you like. You could swap them with gain(0, 1, 1, ); for instance.

@Grantallica 4 года назад

Cmdr Chris is such a good sport, in the 1% of the 1% of human experience. When he talks, you'd always do well to listen

@rdoetjes 3 года назад

Awesome awesome awesome! It’s so cool that they now have the booster rockets outside standing upright and the orbiter inside. It’s been 14 years since I last went to Cape Canaveral but I should go again and behold that beautiful orbiter.

@stvp68 4 года назад

That sudden long shot at 2:30 makes me wonder if they had to film this multiple times, or if they filmed everything at a distance and just created the medium shots and close-ups during editing.

@jizburg 3 года назад

Thats a well rehearsed anecdote if ever i heard one ^^ awsome story.

@jonas1340 4 года назад

Good timing ^^ I've got an exam next week concerning the derivation of the equation ^^

@jonas1340 4 года назад

Ok, turns the maths video is good for thinking everything through to understand the resulting difference to my lectured equation ^^

@PapaFlammy69 4 года назад

11111

@bgandrreviews8184 4 года назад

hey flammy!

@victortolentinocruz6438 4 года назад

Pappa flammy??????

@jerotoro2021 4 года назад

31?

@anandsuralkar2947 4 года назад

Hii

@heh2393 4 года назад

876?

@ricsanders69 4 года назад

This was SO cool...I tried to listen to both!! But my brain couldn't do it!!! Bravo gentlemen...you both are amazing...thank you for this. :-D

@_Tp__ 3 года назад

When he says he will do his maths in the left channel and Chris will talk about his experience in the right channel and I remove my right headphones

@loqkLoqkson 4 года назад

Even with right balance at 0, left at 100, master volume at 100, and youtube at 100, Matt is only the same volume as Chris. finally, with the right headphone off as well, I can hear Matt. Or you can just use the link in the description to hear matt... listening to Chris lets you understand what it's like to be Chris Hadfield. listening to Matt might let you experience being Chris Hadfield

@Rubrickety 4 года назад

I can't even imagine what it must feel like to tap into such awesome power, to experience the sheer, giddy, visceral thrill of being able to integrate like that.

@HaydenSpoelstra 3 года назад

11:37 Matt looks so happy with himself! Someone needs to make this into a meme

@AdityaSharma-ng3bc 4 года назад

If I would have been one of the visitors present there, I would have either fainted or ran like a mad horse towards Mr.Hadfield Can't understand how people can ignore an actual astronaut while looking at some rocket(non functional).

@kelly4187 3 года назад

Probably that effect where people look different in reality than in TV. There was also a bit of distance involved. I probably would have been running at Matt!

@johnpawlicki1184 4 года назад

That 10 to 15% also includes the rocked, at least the last stage. Lots of propellant.

@pkmath12345 4 года назад

Wow great comparison for sure haha I like it outdoor

@jujhaarsingh7889 4 года назад

I don't think you can use mgh in this case for potential energy because it is an approximation for h

@searchbarwebs 4 года назад

I don't have a clue with any of the maths bits but its still super entertaining.

@JoshSmith-db2of 4 года назад

14:00 mgh is no longer a good approximation for gravitational potential energy when you are talking about heights of rockets. mgh is only really meant to be used near the surface of the Earth. For this situation you would use PE = GmM/r

@joopie99aa 3 года назад

The height of the orbit is pretty small compared to the radius of Earth, so it's a decent approximation. In fact if you do the math, the exact calculation gets you ~3.69 x 10^6 J/kg, while the approximation gets you ~3.92 x 10^6 J/kg. So an error of about 6%. Not bad.

@matthewhubka6350 4 года назад

On iPhone you can go into the accessibility settings, then the audio visual settings, and then move the slider all the way to the left or right to hear only one of them. I believe there should be something like that on android as well