RealRandoms i took physics in my junior year, and at first it was really hellish for me, but i recommend watching “the organic chemistry tutor’s” videos about physics on youtube. they’re super detailed and clear, and i ended up getting a 96 on my midterm! compared to like a 54 on my first quiz lol. he really helped me build a strong foundation for understanding new concepts in physics and i wish i had found him sooner
Real qoute from my 3rd year professor "So to understand spin, imagine it as a sphere rotating except that it is not a sphere and it is not rotating. Clear?"
My entire time at uni was the professor thinking that I went home and memorized every single lecture with perfect recall even 5 months later lool How am i supposed to assume an indentity or resymbolization months after it was used once for 5 minutes aha
Even though I studied engineering and not physics, I clearly recall my prof telling us the project we got stuck on was easy, we just had to take whatever reasonable assumptions necessary... Leaving us with the much harder problem of knowing which assumption was reasonable.
@@GalileoAV Same here. Physics one is a perfect world sandbox where you can plug your ears and ignore things that complicate a system, like air resistance.
@@nathanseybold6679 Si Ramo's "Orbital Guidance," is a basic text on how to hit Moscow. You can read it in a cage in an office on Army-Navy Drive, down in Virginia, with a Marine corporal standing at ease a little bit behind you. The essential point of the entire book is that the Earth is a sphere, not flat like you learned in engineering school. Ellipses, not parabolas.
@@Speedster___ it's the insane amount of contradictions in the title...there's introductory physics and there's ADVANCED introductory physics...you could be working at nasa and you still haven't gotten to advanced intermediate yet!!..same thing with professional beginners. Funniest thing is that uni book titles are actually like that irl lol
If you cant do the integral youself say "thats MATlab's job anyway" On a Fields and Waves final one of our questions was to just explain the meaning of an equation. It was basically just an integral across the spectrum of light reaching the surface of the earth * transmissivity of silicon at each wavelength (basically an effeciency of a solarpanel), something that is just a concept question as a computer can do it in under a second. (And a human would die trying)
Hate to break it to ya but philosophy is not the place to turn to for answers.... As a physics and philosophy double major over here, I am still lost af in terms of my decisions.
That's not what academic philosophy courses deal with. As a philosophy double major, that is a HUGE misconception when people take a philosophy course. We aren't sitting under trees talking about the meaning of life...
I remember a professor demonstrating the theorem for N=1 and telling us to do induction in our homes to prove the general case (it was one of the most important theorems of the course, too). Damn, we hated that woman
@@ericdaniel323 dude i hate this. i am not majoring in math, but I am trying to understand math for computerscience and in general because I am interested and every time I see this, it throws me up xD
taking E&M right now and the professor after setting up a problem is always asking before he moves on, "do you guys want me to do this?... No I'll let you guys try it on your own or maybe for homework idk." And it turns out to be finding the E field of a cone using cylindrical coordinates that gives an integral that wolfram would gain sentience from and personally refuse to ever solve another equation again.
Idk why but that last joke got me Professor: “it was pretty straight forward, only Andrew missed it, of course.” Andrew: “what?.... Oh yeah, I said it was zero.”
First day of physics undergrad: Professor says that we'll be using matrix algebra to solve a set of problems. I commented that I'd never studied matrix algebra. Professors pauses, looks at me and says, "You'll figure it out." Later that same semester: I go to the math lab, hoping to get help with a problem. The grad student running the lab looks at the problem and says: "Yeah, no one here will be able to do that."
@@giggidyguy7149 I did not know that. In Spain is almost imposible to start a bachelor degree in math, physics or engineering without knowing matrix algebra.
the spin thing is even more relatable for a chemist who doesn't really get physics that well, but is trying to understand NMR.
5 лет назад
NMR is the craziest shit ever. I don't know how deep down the rabbit hole you got but understanding stuff like coherence pathways and 2-3D pulse sequences, is just too much for me. Thankfully I can still run spectra.
@believe German K5 Ok i Will try. First of all spin is the result of a famous experiment, the Stern Gerlach one: in their apparatus, briefly put, a beam of energetic electrons (like a laser) goes through a narrow path between magnets (a non-perfectly uniform magnetic field) and the path results split in two paths (up path and down path) at the end of the pathway the electrons took. This baffled scientists. Others eventually could even repeat with a very low flux of electron (imagine one electron per second) and the electron had a 50% of either going up or down. This killed determinism, even from a statistical physics point of view: how could an electron go either up or down? Then the electron must live in a "spin" state which is 50% of the times up and 50% of the times down. Spin up, spin down. How does the electron "decide" whether it goes up or down in the Stern Gerlach apparatus? Well this is the beginning of quantum mechanics. Spin is one of the seeds of quantum mechanics and its postulates! I can suggest some readings like Griffiths introduction to Quantum Mechanics if you would like a very soft intro to QM, or Shankar Principles of quantum mechanics for clear statement of the axioms, or even Introduction to Hilbert Spaces with Applications by Debnath if you want a formal axiomatic introduction to quantum mechanics. Briefly speaking, spin is a quantum "magnetic dipole" property of fundamental particles, and leads it to the quantum interaction with magnetic field. An electron can be both spin up and spin down until a measurement is made (such as stern Gerlach, it blocks the spin to either up or down after the magnetic interaction which counts as a measurement by the environment). Have a great day :)
@@florianm9693 You ever heard of the "this model is mostly false and usually incorrect but we've been using it for several years now, so it is a common practice to know and use it"?
OMG!! You probably don’t remember this but we were in the same art class in 11th grade!! I was casually scrolling through my recommended page and I saw you name. I was like “wait a minute, that name sounds similar” I’m so glad to find your page and see you are doing amazing. ❤️
@@Novozymandiaz they referring to electron spin and how it influences neighboring subatomic particle behavior... but yeah, it is generally something rotating around an axis, similar to overpriced tops.
Undergrad : Kirchhoff’s Loop Rule - The sum of all the voltages around any closed loop in a circuit is always equal to zero. Grad: Kirchhoff’s Loop Rule is for the birds.
Your course titles written on the board were brilliant! Relativistic Astrology?! Quantum Geology?! Loved them all. And that "one of these books will help me" [pulls out Basic Japanese text]. Had me literally laughing out loud.
The multiple books for homework hurts on a whole other level, i had 3 math methods books and 3 course specific books, combined with internet and still couldn't figure the damn thing out :(
@@marcoaranas It's not uncommon for professors to make their graduate level courses research like. In such a case they'd say "I dunno, figure it out" because that's roughly what your advisor would say if you ask them most research questions. Though in the latter case that's because you're the expert on your project, not them. They legitimately just don't know.
I had a terrible undergrad professor she deliberately would not use standard notation and asked questions in such a way it was difficult to research, plus her lectures were just her reading from a textbook. She was the worst.
@Giovanni Mahoney It is just about the shift of positions of planets and constellations when your mother is giving you birth while moving at a relativistic speed?
@@johndunigan5473 Welcome class! So, here is your equipment, the strings are already on. So we start in the standard tuning, EADGBE, and let us try playing Smoke on the Water for a warmup!
"I said it was zero". lmao *relatable* Undergrad friend: "UGH I got this impossible problem!!! I've been working on it for days!! How are we suppose to deal with these sine functions!! AAARGHGHG." Me: "It's one." Undergrad friend: "WHAT? You haven't even looked at the problem." Me: "There is a symmetry argument and it is 1." Undergrad friend: "HOW could you possibly know that?!" *two days later* "It's 1."
Yeah! First thing i take a good look when facing an integral is the integration interval, and then see if the functions are dislocated, and even or odd.
That's interesting. Because it can be the opposite of what is taught. Many undergraduate courses tell students that the Schrodinger equation is a postulate; in graduate school, one derives it.
(Edit: spelling) That's not how I learned it. Please see "A Modern Approach to Quantum Mechanics" by Townsend. Wikipedia has a section for the derivation, too, albeit incomplete. en.wikipedia.org/wiki/Schr%C3%B6dinger_equation#Derivation
In my last semester as an undergrad, I took mostly grad classes (but in chemistry), and what stood out to me as absurd was how undergraduate classes get lectures, lecture recordings, homework problem sets, multiple texts, supplemental instruction, discussion, TAs, and a library full of tutors to help, whereas grad classes get the professor's lectures, a recommended textbook if you're lucky, and your tears.
Foundations of Advanced Introductory Physics for Beginners 3: Grad Student: "Hey Prof, what's the recommended book for this course?". Prof (in thick russian accent): "Book? There is no book" (then recommends Landau and Lifshitz on course web page as the only reference).
I see you are the lucky one. My professors recommended a book that we never use at all and it was expensive, and upon reading the author, it was my professor. Freaking cheap way of making money.
“One of these damn books has got to help me with my homework” Me, watching this after spending 3 days working on my first grad assignment just to go to class empty handed: The Bach is probably fine
I watched this video a while back and I was like, "Yeah, right." Now, after my first semester as a physics grad student I'm like, "Dang, this guy was spittin' facts!"
Professor: Does anybody have any question so far? Students: (Eyes on the desk to avoid eye contact with professor) ... Professor: Good! We are now moving on to next chapter which talks about...
We actually skip the next chapter (although you probably ought to read it during the weekend, do all the related problems and get another book as this will be on the exam) and move on to something completely different.
@@u.v.s.5583 Professor: I am sure you all must have excelled at this course already, now let's digress into some interesting physics in different dimensionalities.
Here's something funny and from personal experience: When I was learning quantum mechanics in college, it made absolutely no sense to me. But when I took the quantum class in grad school, because they go over the calculus in much more detail (Hence why you need the Dirac notation), everything suddenly became a lot easier to understand.
Im sorry dont you immediatly use dirac notation in your grad class? Because im a 3rd year physics grad and in my QM class we immediatly started going deep with Dirac notation, bloch rapresentation etc... sounds weird to not use diracs notation in QM
This is one hell of a video I've watched in ages. Please please please keep making such videos. From 1:33, I got a big big woaaahhh. We used to study from Griffith's as well during undergrad and I remember sitting in the library with I guess 4 books opened for the homework of my graduate school electromagnetic theory course 😂😂 Totally totally dope video. ❤️
@@sunshinedaniela8572 Thank you for catching that. I don't remember if that was suppose to be part of the joke, or just a typo I didn't catch lol. Thanks regardless.
The question on ‘spin’ had me 🤣 I studied spin chain systems, and when I was asked by the panel what exactly is spin, they got a mouthful of word salad.
1:42 "One of these books HAS to help me with..." No, no, they don't and they won't. Almost two years in grad school and I still struggle with that harsh reality.
As a physics student, that moment when you can’t find answer or any resemble hint from any sources is so relatable😂😂 I dig into tons of books and online research papers yet I finally give it up
The answer is written in the Ancient Scroll. First law of Spin: He who thinks he understands spin does not understand spin. Second law of Spin (Palpatine's theorem): spinning is a good trick.
The part where you pulled tons of books as graduate student to solve a simple question is so true!! 🤣🤣 I literally bury my desk in heaps and heaps of library books 🤣🤣
The spin question is so true. Also I noticed the 1/137 finestructure constant and then the pi/137 reference to the cgs-system, where you just move multiples of pi from some equations to others, just so that some of the equations in electro-magnetism look a bit easier.
I swear re-watching your skits and relating to it more and more each time is the best crap. XD I started watching your stuff as an undergrad and I'm a grad student now, so it's just really fun.
Spin is like an object in non-Euclidean geometry. We call them points, lines, angles, etc. but they bear absolutely no resemblance to our real world understanding of those words and what's more are so algorithmically sturdy that we could call them frogs, cows and chickens and everything we are saying would still be correct. Spin is like that.
I was a math major and I feel this so hard 😂 but instead of undergrad vs grad it was like the first 5 semesters vs the last 3 for me, especially with the 6 page hw assignments and the you’ll learn this later/you should’ve learned this already 😭
Very funny!!! Typical physicist humor. When I was an undergrad I had some physics major friends and I would hear these sorts of jokes and stories quite frequently. Loved the line on the whiteboard about Foundations of advanced introductory physics for professional beginners!! 😄
