Coffee and the problem is great except I'm much better at coffee than I am even understanding the problem
@user-vn8pw4yf3h
6 ай бұрын
16:09 still trying to understand the algebra lol
@icecrack4579
6 ай бұрын
@@user-vn8pw4yf3hIt's a partial derivative as denoted by the curvy d symbol. Idk why it is the partial derivative, but it's still functioning like a regular derivative w.r.t time in this case.
@GH-oi2jf
6 ай бұрын
It's like watching a piano recital of Chopin pieces. I am not musical and cannot understand how the arcane notation of music can be turned into audible form so (seemingly) effortlessly, yet I see (and hear) that it can be and I can appreciate the result.
@Pingviinimursu
6 ай бұрын
A banger of an idea, except I don't drink coffee and don't understand how I'm even supposed to approach the problem 😂
@thomaskalinowski8851
6 ай бұрын
This is why I majored in history rather than physics. Historians generally don't need to know math. What do they need to know about? Clothmaking. A good working knowledge of clothmaking is essential to being a historian.
@AndrewBlucher
6 ай бұрын
24:09 As a retired academic I'm thinking "this guy was teaching this stuff!". Nice work identifying this as Prof Longhurst's book. You're right about the (mostly obsolete) books we hold on to. I guess when I go someone will just send mine for shredding, with no idea who all those famous (to me) authors are. Sigh. Feeling mortal today, I spread my Mum's ashes yesterday.
@archivethearchives
6 ай бұрын
Sorry to hear about your mum.
@AndrewBlucher
6 ай бұрын
@@archivethearchives Thankyou.
@AnnoyingNewsletters
6 ай бұрын
Will your library to Dr. Collier?
@AndrewBlucher
6 ай бұрын
@@AnnoyingNewsletters Hi Don, now that IS an amusing thought! I think the freight cost from the other side of the world would be prohibitive. Regards, Andy PS I liked your username.
@charliekim2939
Ай бұрын
I have some physics, astronomy/cosmology and math books, and a thousand or so DG, Decca, Philips, etc. CD's (of John, Ludwig, Wolfgang, ..., Gustav.) I cannot carry them with me to an assisted living or a grave (or crematorium), whichever comes first. Thinking about throwing them away into a recycle and/or trash bin breaks my heart, but it is inevitable. (Sigh!. Just like Angela sighs from time to time.) Then, bury or burn them with me? Not practical. Wait a second! I am only mid-70 and still have (hopefully) a decade or so to go over them once again, item by item, cover to cover. I wish I could go peacefully with a book on my lap and a soft chamber piece playing on my earbud. I think I am psychologically ready to go telling people around me a genuine "I wish you well."
@qtw5142
6 ай бұрын
horrified as a mathematician watching a physicist write 200/3 as 70
@RibusPQR
6 ай бұрын
Physicists committing math crimes, mathematicians being horrified; a cycle as reliable as a pulsar
@pllpsy665
6 ай бұрын
Since 200/pi = 60 we can conclude that after taking the average 200/3=70 . No problem here.
@kirchdubl1652
6 ай бұрын
technically speaking mathematicians also have to round down 200/3 to some number of decimals. They cannot show infinite number of digits.
@m.f.3347
6 ай бұрын
as long as the approximation is smaller than your margin of error you've got nothing to worry about :^)
@adjutant
6 ай бұрын
...70 +/- 70 checks out👍
@AlexDoesYouTubes
6 ай бұрын
Oh shit, I have time to watch this before my menial retail job!!!
@jordancate5401
6 ай бұрын
Good to know there are others.
@guycoolSpore2
6 ай бұрын
@@jordancate5401 Is it good? Is it good for us to know there are others suffering like we do?
@kevindevine5033
6 ай бұрын
My man......hehe.
@TheAces1979
4 ай бұрын
That textbook story was so cool. What a find! That's like ending up with a certified Picasso that you bought at garage sale. So fucking rad!
@judahmatende3769
6 ай бұрын
my weekly shot of advanced physics from my personal dealer ❤️ you!
@altrucker18
6 ай бұрын
I loved this as I was making breakfast and drinking coffee! Thanks for sharing your book and its cool history.
@charyaka
6 ай бұрын
Same
@daviddean707
6 ай бұрын
O dear I hope this is ironic as I've abandoned STEM for creative writing and almost every young writer wants you to know that their protagonist uses a dealer.
@Tayken9127
6 ай бұрын
Angela "It's a really easy problem, we don't need the solution", me completely lost nodding "uh huh".
@bobshowrocks
6 ай бұрын
Hey, this is tangentially related to my day job!! Precise GPS algorithms also rely on figuring out how much the signals are delayed while traveling through the ionosphere. We're kind of working the problem the other way around, and use several approximations but it's very cool to see the same basic problem from a different point of view. BTW the use of ancient mellenial memes? *chef's kiss*
@pluto9000
6 ай бұрын
I watched to the end so my Int stat has increased.
@Smo1k
6 ай бұрын
Not unless you solved the problems underway.
@balijosu
Ай бұрын
-cha
@NickC84
6 ай бұрын
I absolutely love those old textbooks too. Which reminds me, speaking of old books, I have a collection (well parts of it) of the "Most important books of the Western World" and it has several books in one. Like one has Faraday, Lavoisier and.. Pascal? I think. Anyways... I was reading part of the Faraday section and HOLY HELL. I mean, I know Faraday is one of the most famous experimental physicists of all time (if not THE most famous), but you can immediately tell why when you read his papers. Like, I won't even type an example because it would be 3 pages of how he setup the experiment and tried pretty much every single iteration of the different ways it could be performed and made notes of all of it. Even if it amounted to nothing. Dude was a machine.
@Asiago9
6 ай бұрын
It's even more impressive when you remember his only training was reading books between him binding books
@sebster100
6 ай бұрын
I have the same book! It's Fourier, not Pascal. Which makes it foundational for pretty much all of modern engineering and science one way or another between the three of them.
@snozwanger760
6 ай бұрын
What a wonderful way to start the day. Thank you Dr Collier. Your videos have been one of the valuable bright spots in the difficult world we live in, and I am very grateful for the time and effort you put in to making them. What a gem, to have randomly recieved Dr Longhurst's annotated copy of that text book.
@testboga5991
6 ай бұрын
Elegantly put, fellow spacetime traveler!
@Broockle
6 ай бұрын
Did you know of him/her before?
@orangebutnotred
6 ай бұрын
HOT and JIGGLING ions near your location!
@DFGdanger
6 ай бұрын
🥵🥵🥵
@BohoAstronaut
6 ай бұрын
😂
@Robert_McGarry_Poems
6 ай бұрын
BOOM! 😂
@ryanamendt8363
6 ай бұрын
I love ion on ion action.
@Bassotronics
6 ай бұрын
The Hoax Hotel
@nowhereman8374
6 ай бұрын
I loved you doing the solution as I drank my coffee. Plasmas are also very important in down to earth applications like semiconductor manufacturing. Keep up the good work.
@bn3121
6 ай бұрын
That last part about Glen's notes is so touching. It's super cool to get the thoughts of someone who was teaching the class on the textbook being used to teach it!
@sciencenerd7639
6 ай бұрын
I really get a kick out of the fact that you have the exact same molecular cell biology textbook in your bookshelf that I have. I think it's even the same edition. That was my favorite class in college. Your videos are great, thanks.
@woodreauxwoodreaux6298
6 ай бұрын
The music in your videos is always great. The aesthetics this episode were extra awesome. And don't worry, your hair looks great, keep doing what you're doing.
@marshalleubanks2454
6 ай бұрын
It's pretty straightforward to calculate the 1/f^2 term from first principles when the plasma is neutral. The positive ions have a much larger mass than the electrons so to first order a passing E&M wave does not move them compared to the motion of the electrons. So, a passing E&M wave moves the electrons off of their default position, and the charge of the stationary positive ions provides a restoring force. So, you have a second order harmonic oscillator with the plasma frequency (f_p) being the resonant frequency, and so the response to a wave at frequency f goes as (f_p/f)^2 - as long as f >> f_p.
@sciptick
6 ай бұрын
Oh, hey, Marshall. Have your people briefed you yet on phased-array antenna techniques using non-planar arrays?
@marshalleubanks2454
6 ай бұрын
@@sciptickAll VLBI is in practice done with non-planar arrays.
@judgekonnan
6 ай бұрын
I did the coffee part successfully. Hopefully that's half of my grade.
@inappropriatejohnson
6 ай бұрын
Your production values are getting pretty great........the steaming-coffee outro is lovely. Thanks
@cmmartti
6 ай бұрын
The lighting is also much better in this video, probably because she's near a window and it's daytime.😊
@samforsyth
6 ай бұрын
I’m not a scientist or mathematician or anything. I have degrees and background in writing and audio/visual communication…. If I weren’t poor, and I had some pull somewhere… I’d send recruiters after you nonstop to teach any subject. You’re such a fun and effective communicator.
@SuLokify
6 ай бұрын
Your current lighting setup is really aesthetically pleasing. Love the glasses shadows, especially works well with dark hair and eyes and other shadows. Sorry if that's weird I just found it really striking.
@deoclonix
6 ай бұрын
I LOVE this! Also, the fact that you got a copy of the book with annotations from someone who taught the class is SUPER cool 😎
@coldthinker2233
6 ай бұрын
One minor addition. Plasma is super important for a lot of industrial proceses and it has room to enter into so many more. For example plasma is esential in producing microelectronics and all sorts of surface coatings and other material proceses. So there is a lot of interest in it even when you take space or fusion out of the equation.
@Laurent-u5w
6 ай бұрын
It is only fir graduate engineer that learn plasma. The question: how to realize plasma? Concerns engineer. Physycist stays at the general principle of physic. Fluid dynamic or heat transfer are much more well manage by engineer than physicist. E.g pitot probe for conpressible fluid like the air and for viscous fluid have the same shaoe? No. Even if in pitot theory the viscosity doesn t appear clearly
@svt4001
6 ай бұрын
70 parsecs, (+/- 70 parsecs)! I literally laughed out loud!
@richardbloemenkamp8532
6 ай бұрын
Well I can believe the +70 parsecs but I don't believe the -70 parsecs. The idea that the uncertainty is symmetric around the answer is usually not true for large uncertainties. More often you find plus or minus a factor 2, thus +100%, -50% which is symmetric on a log scale.
@FreemanPresson
3 ай бұрын
@@richardbloemenkamp8532 Better yet, I misheard it as 7 ± 70 pc, and thought, "So, back when they thought the beam might be coming from the opposite direction? Confuuuuusing!
@phaaroyt
6 ай бұрын
I tried to solve the problem before you did, but I'm bad at math, so my answer was "European honey badger." I'm not sure which step I got wrong but I noticed it by the time you got to the Taylor series.
@RockyTremblay
5 ай бұрын
Angela is brilliant and fun. Coffee never tasted so good.
@nusaman
6 ай бұрын
It’s amazing how much an object mean when you know it’s history. Your attachment to this book, its provenance, is the hallmark of a true nerd. Love it.
@throckmortensnivel2850
2 ай бұрын
Another brilliant presentation from Dr. Collier. Keep'em coming!
@albertqhumperdinck
6 ай бұрын
COFFEE AND A PROBLEM, this is so good, you are so good, I am beside myself, Dr Collier, Angela, you are gift to the world at large and to my continuing education. This is EXACTLY what I want to do on a Sunday morning! I have my notebook out and everything!
@XKloosyvv
6 ай бұрын
Sunday morning, fresh sheets, cold drink, a cool, gentle breeze, and physics. Perfection.
@Amira_Phoenix
6 ай бұрын
Lucky you, we're having torrential rains here at the Mediterranean ⛈️
@mattinlb533
6 ай бұрын
SUNNY IN THE HOT TUB IN PALM SPRINGS 🙃
@ianTnai
6 ай бұрын
Awesome that book went to you! You have just shared it with the world. What a great outcome!
@FreddieSmith-rl2ww
6 ай бұрын
That was the exact text book used in my plasma physics class back in 1978! I attended the University of New Mexico In Albuquerque where Sandia National Labs resides. I was an undergrad student, the only one in the class, competing with many grad students who worked at either Sandia NL or the Air Force Weapons at Kirtland AFB. Huge amounts of research in nuclear weapons effects and inertial confinement at these facilities. And when Reagan became President the money flowed. While attend UNM and afterward I spent 15 years doing EMP and ionizing radiation effect studies of defense systems both in theory and testing. Exciting research about a not so nice issue. This brought back a lot of memories! And, I agree, Chen created an excellent textbook. Please keep up the good work.
@_PatrickO
6 ай бұрын
Illinois EnergyProf (Prof David Ruzic U of Illinois) has a great video on inertial confinement from about 4 years ago called "Inertial Confinement's Progress". He has a bunch of good videos on fission and nuclear reactors.
@BrianFedirko
6 ай бұрын
I love watching Angela work through reason and using generality. This demonstrates to all of us that there is "specifically" this trick, and of tricks there are many that give us the same general answers. It demonstrates that there are so many ways to skin a cat, as I assume Schrodenger would be agreeable with the skinning of cats. To arrive at where we are at in the universe, and at the same time arrive at being closer to understanding "fusion" with plasma is poetic and demonstratable.. We use the gigantic to study the insanely small, and the ways of thought bring us useful answers to apply to the real world around us. Relativity is about being relative, it's amazing we can include an absolute in the equation. Gr8! Peace ☮💜
@bluediamonds4911
6 ай бұрын
As a freshman studying physics and nuclear engineering your videos are so enjoyable and make me look forward to what's to come on my journey. I also just think you're an amazing and funny creator and love all of your videos. Thank you so much!!!
@fmdj
6 ай бұрын
24:50 aww your tribute to the dead teacher here is beautiful, cool edition of that book that you have
@hcgtrplaya92986
6 ай бұрын
I was initially skeptical of this video, but your monologue on the aesthetic appeal of a textbook on the intro kept me hooked. Instantly set the mood.
@NoNeedtoFeedtheJudge
6 ай бұрын
My profesor in EE would say old textbooks had so much condensed information that to unpackage it all it would have to be 1000 pages. I do wish they would combine the digestive ease of information and older textbook graphics and questions. Love your videos! Thank you!!
@orange-micro-fiber9740
6 ай бұрын
15:25 "part b is just plug and chug." lol, I haven't heard that phrase in 20 years. What a trip!
@teddymasters1347
6 ай бұрын
Do I spend all my time doing (undergrad) research thinking about pulsars? Yes. Am I delighted in having Dr Collier explain them to me? Also yes.
@cjgeminitarot6836
6 ай бұрын
What I’ve learned from your videos is that in ten years, we’re having another physics revolution. No matter where we are in time: in ten years, it’s coming, babe.
@ivolol
6 ай бұрын
Getting super duper excited about how the Faraday effect could significantly affect photons' polarisation over stellar distances, before slightly abashedly looking into the camera and wondering if anybody at all would find that just as exciting an example. I can barely wrap my head around the physics and oh god my brain is struggling to grasp back any knowledge of college calculus left but your energy sure did still punch through the screen at me. Thanks for the videos. 🥰 edit: no, I didn't take any notice of the top of your head until I had to pause to check out what this new grey box was informing me. I was actually checking to make sure I understood the algebra workings out correctly
@neongrey333
6 ай бұрын
3:24 holy shit the texture of that paper it's gorgeous like yeah the stuff you pointed out with the cover and diagrams are great but wow!! the paper!!!
@borgoltat8862
6 ай бұрын
Angela. I am a physics major. This is amazing. I will watch these.
@culwin
6 ай бұрын
0% Autotune✅ 0% Alcohol✅ 0% Aliens✅ JUST PHYSICS 🔥🔥🔥🔥💯💯💯
@wtfpwnz0red
6 ай бұрын
"We don't really deal with plasma much on earth." Styropyro: "heck"
@ivanklimov7078
6 ай бұрын
damn how do you manage to consistently make vids on topics relevant to me specifically at the moment. i've just started a course on em waves in plasma at uni, it's a little different, we're mainly talking about the earth's ionosphere instead of pulsars and such, but still it's great to get a different, less formal view on the problem. love your output, keep it up!
@JackKirbyFan
6 ай бұрын
I LOVE these segments. I had no idea you did this. Keep it up. Thank you. And yes, when I got my EE degree, I was equally frustrated that all we did was math and the math was for the math. Often times you didn't need to know the subject, just how to crank out partial derivatives.
@Jaybirdtweet
6 ай бұрын
That was lovely, what a wonderful find, old books are the best! Great channel
@stutzpunkt
6 ай бұрын
Honestly…this is some of the best deadpan humour on all of the internet 😂
@ralphc7842
6 ай бұрын
I watched this a few weeks ago. Today at work I was randomly looking at some books that our former library discarded (ya know everything is on line). My good luck, I found a copy of this book, the condition is not as good as the one Dr. C has but good enough for government work! Always looking forward to your videos, great stuff.
@Polsaar
6 ай бұрын
this video was a journey of self discovery. thank you so much.
@yeroca
3 ай бұрын
About 15 years ago, I visited a small observatory in eastern Oregon at Pine Mountain. At the time, they were making some observations having to do with the polarization of light through plasmas, so it's a real thing :D
@andytroo
6 ай бұрын
my favourite "one weird trick for distance" is to use super-distant lensed events - different paths arrive at different times. if you can find events separated by 30 years, then you have a difference in distance traveled by 30 light years. if you can use the difference in brightness, or redshift on the two paths to get an absolute measure of distance , not just a relative one that a single redshift measurement would do - "Strongly lensed supernovae as a self-sufficient probe of the distance duality relation"
@seanemery6019
6 ай бұрын
I regret that I have but one like to give for this video. Headed to Patreon now to see what videos I've missed. Please keep doing your thing here on youtube.
@wbebbs
6 ай бұрын
Thanks, Collier. Very well presented, informative, clear.
@pjvandijk3987
6 ай бұрын
I share your emotions about second-hand science books. We stand on other's shoulders. I always hope there is a name of the previous owner in there. My bookcase is a sanctuary for (affordable) old science books.
@onehitpick9758
6 ай бұрын
I was going to dispute the ability to measure distance accurately this way due to disproven assumptions of "average plasma" , but you got me with the 70 parsecs plus or minus 70 parsecs.
@paulkacinari2382
6 ай бұрын
Pulsars hate her for this one weird trick!
@pabilbadoespecial
6 ай бұрын
Fun fact, Chen's book is based on the notes from John Dawson. The same diagrams and figures are in the notes, but just hand drawn by Dawson.
@Stevenontheside
6 ай бұрын
thanks for showing us the most* beautiful textbook, and great find. Unbelievably, you are teaching and writing the book to us as a perfect steward also. Thanks for buying and transcribing.
@TsubataLately
6 ай бұрын
Beautiful books definitely spark joy in me. A favorite author of mine recently released some gorgeous editions of his most famous novel. I wanted to cry, they were so lovely. The departed professor's annotations really do make that beauty a treasure.
@csours
6 ай бұрын
Imagine you're a pulsar. I'M A PULSAR WOO WOO WOO WOO
@ultravioletdream
6 ай бұрын
Love the pseudo clickbait title! Your videos are entertaining and I always learn something; even if that is how inadequate my understanding currently is :-)
@samishahin9642
6 ай бұрын
Thank you for working through this problem Professor Collier! Can't wait for the next lecture 🤓
@Bassotronics
6 ай бұрын
I love this woman. So smart and lovely.
@dee5tank
6 ай бұрын
I had to listen in after seeing the video's clickbaity thumbnail. I heard it in my head with Angela's wry wit and irony, and I adore it. 😂❤
@FrancisFjordCupola
6 ай бұрын
But we have had nuclear fusion for billions of years. At a relative safe 1 AU distance.
@jsteeles
6 ай бұрын
The book cover kind of reminds me of my 1st edition of the Silmarillion which is also from the 70's love it so cool
@emmafountain2059
6 ай бұрын
That is a gorgeous textbook.
@gavinmatthewlyall
6 ай бұрын
Dame Jocelyn (no) Bell she don't give a hell she found what she found - you can't get around it no matter who got the Nobel for it
@bobjoe3738
6 ай бұрын
I found the solution on page 459 of the 3rd edition... It converts the distance of x = 1.9x10^18 meters to 63 parsec. Great video, I learned a lot..
@amilkyboi
6 ай бұрын
Working on plasma physics homework as I watch this. That first edition of Chen is certainly more aesthetically pleasing than the third edition I own.
@gornser
6 ай бұрын
I see what you did there and applaud. Jocelyn Bell Burnell did the work
@liamf5311
6 ай бұрын
Irish geek here I thought u meant they hate jocelyn bell Burnell for discovering them and her discovery stolen btw love your content keep going and sabine hossenfelder will hate u lol
@Galahad54
6 ай бұрын
Cool video and book. Speaking of beryllium, some of the oldest stars in the Milky Way, in NGC 6397, date back to 13,537,200,537 +- 969 years ago (Galaxy Quest, 1998, historical document). Amazing, considering that observing the spectral lines for beryllium required a space-based observational platform.
@ConsecDesign
6 ай бұрын
Your lighting and audio are so much better!
@tobiasstewart5632
6 ай бұрын
I always go into your videos with the best intentions…I dropped out of school for a reason
@jestingrabbit
6 ай бұрын
RIP to Glen
@takanara7
6 ай бұрын
You can hear this phenomenon in soundwaves on ice, like you'll hear these weird sci-fi sounds as the frequencies get dispersed in the ice.
@michaelblacktree
6 ай бұрын
My takeaway from this video is that astrophysics math is really fuzzy. 😛
@tim57243
5 ай бұрын
Love the ironic clickbait in the thumbnail. Not many KZitemrs are measuring distances to pulsars.
@houmamkitet9555
6 ай бұрын
This was a really fun watch, i do struggle with the part about finding which equations to use for solving it
@futurepastnow
6 ай бұрын
in 1976 the US Energy R&D Administration projected how long fusion power would take to develop at various different funding levels. With "maximum effective effort" aka blank check funding, they believed we'd have a working fusion reactor by 1990. With various later projected dates based on lower funding levels. They called the 1976 level of funding "fusion never". The actual funding for fusion power since then has been below the "fusion never" line.
@heel57
6 ай бұрын
Thanks for an Interesting video. Don't bother about if your hair does not look like you think other people expects it should look - it is irrelevant - you have so many additional attributes to offer!
@UnMoored_
6 ай бұрын
Immediately reminded me of bumping into Frank in the elevator with his electric scooter well after his retirement.
@wbbartlett
6 ай бұрын
My brain turned to plasma just reading the problem
@rossjennings4755
6 ай бұрын
Oh look, you found my subfield! It's sort of weird that the textbook put this in terms of df/dt ~ f^3, rather than dt/df ~ f^-3, or rather Δt(f) ~ f^-2, which is how I'm used to thinking about it. I mean, I guess df/dt is the actual slope of the "line" seen in that plot from Jodrell Bank (which is one of the most common ways people tend to plot these things). But I'd argue that df/dt is kind of the "wrong" thing to look at (even though mathematically it's all equivalent): it suggests that t should be thought of as the independent variable, when really f is the independent variable.
@Space_Gaucho
6 ай бұрын
I just sat down with a coffee and this is a very welcome coincidence. Also the part in your hair kinda looks like the bottom part of pulsar graph you showed if its rotated 90° clockwise, very on topic!
@lbgstzockt8493
6 ай бұрын
I love the fact that I am not the only one who gets confused with angular and regular frequency.
@martijnvanweele6204
6 ай бұрын
Angela Collier and the Half Blood Prince
@mjkluck
6 ай бұрын
Good stuff, Doc.
@ExecutionSommaire
6 ай бұрын
11:12 well if your hair looks like a figure about high energy cosmic rays hitting the atmosphere, this is a win
@WiiSpords
6 ай бұрын
That is a pretty text book, but does it come with an informational CD-ROM?
@stiofanmacamhalghaidhau765
6 ай бұрын
not in 1976. 1996 maybe, 2006 yep for sure
@youngc570
6 ай бұрын
Angela, please get a coffee cup that says "String Theorists' Tears".
@jdmr4815
6 ай бұрын
I understood none of this, but that's fine. It's fine.
@ishamyyl
6 ай бұрын
"it's a cozy" yes :) "weekend" yep :) "morning" true :) "And you solve the problem right along with me" absolutely not :) Homie, there's no way. I will enjoy every moment though! ☕☺️🌅🌄
@NoisyMayhemInc
6 ай бұрын
I remember tracing those embossed book covers with my fingers And the Love Hate tattoos across my mums knuckles with the other hand The 70s 😁
@johnsouza4391
6 ай бұрын
The snark factor in the comments is actually higher than the video this time. I actually had to laugh out loud, LOL.
@anthonybrennan4416
6 ай бұрын
11:10 Obviously some Kind of Super Hero mark ! Dr. Colliers super power is rescuing Forgotten physicist From Obscurity.
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