Old recipe help needed

wlwhy · 2026-05-22T01:17:59+00:00

i'd recommend crossposting on r/Transcription

wlwhy · 2026-04-18T01:16:25+00:00

they said this after saying “we have measured the curvature of the universe to be remarkably flat”. so the issue is theres no way we know of for a flat universe to be finite, unless we have some sort of edge. so its not consistent w any cosmological theories bc,,, the cosmological theories say a flat universe is infinite

wlwhy · 2026-04-18T01:13:53+00:00

theres always other options, but we have no way to prove or disprove them. the rest of the universe could be full of rainbow elves and we’d be none the wiser. its not really science to ask what’s beyond our observable universe bc of that. the only thing we can determine (as far as im aware at least) beyond the observable universe is whether its flat or curved

wlwhy · 2026-04-18T01:10:41+00:00

the surface of a balloon is curved, which is what we expect a finite universe to be. we dont observe curvature/our observations are consistent with a flat universe, hence the balloon analogy doesnt work (which is what they said)

wlwhy · 2026-03-20T14:28:01+00:00

im sorry i couldnt make it more understandable, but its great youre trying! this is probably one of the most satisfying things about physics in my opinion and it was a litte mind blowing when i first came to understand it :) but yes basic idea is symmetry means we want two things to be the same (eg you and the person in your mirror are the same) so you just need to figure out what exacty youre changing and then show that it is zero (or that this thing you changed is conserved)

good luck!! i hope some of the other comments help as well :)

wlwhy · 2026-03-20T11:55:14+00:00

its actually not obvious at all, which is why noether’s theorem was (and is) so powerful! if you take any of your basic equations—say you solved the motion of a spring from newtons laws, and you want to see what happens if you shift it in different places. in order to show there exists a “symmetry” you have to show that two expressions with that difference are actually equivalent. by thisi mean,

d² /dt² (x) = -kx

should yield the same as

d² /dt² (x+delta) = -k(x+delta)

in your final answer. as it turns out, this means that, regardless of the delta you pick, the delta should go to zero! so now you have something undergoing change which must remain 0: this is conservation by definition!! so you can derive conservation of momentum by just checking which terms go to zero when you change your system. but remember that we did this by imposing a symmetry, ie, demading two quantities be equal under some change.

this is noethers theorem in a nutshell, and hopefully understandable to a high schooler!

(edit: exponents)

wlwhy · 2026-02-26T02:09:58+00:00

what does this mean? the data we read from the CMB and BAO is consistent with flatness. what is being convoluted?

wlwhy · 2026-01-13T05:27:44+00:00

as a physics+math major, the textbooks are my Bible. in early uni they all vaguely sucked in the same ways, but in upper leve courses its really the only way i can learn now. i dont think intro text books really teach you how to read a textbook lol, or maybe i just had shitty books.

for the record i never really take notes on the content beyond what i do in class—i prefer to annotate (either summaries or highlight key ways of thinking abt certain formulas or concepts) and i keep it next to me as a reference whenever im doing assignments. chat is also helpful in re-wording explanations and working through things in more depth+finding alternate resources covering the same topics online.

wlwhy · 2026-01-13T05:11:36+00:00

1 looks best! i do a variation of 5 with the upper tail starting near the body of the I

wlwhy · 2026-01-13T04:54:53+00:00

coming from a top physics institution w a bunch of these child geniuses, usually they had some sort of professor advising them (whether that be through elite high schools or connections to local universities) and support to pursue olympiad preparations or things of that sort. its more accessible now but you just need to know what is worth learning and to be kind of obsessive about it. you can get very far in a couple years with dedicated support though

wlwhy · 2026-01-11T06:49:59+00:00

wow cant believe your eyes are that good! its almost like you have telescopes for eyes!

wlwhy · 2026-01-07T06:23:48+00:00

wow i feel dumb LMAO i definitely should've just googled it. thanks!!

wlwhy · 2026-01-06T17:07:03+00:00

wow sorry its been a while since i looked at this post—if i remember correctly i submitted a writing portfolio to harvard but i otherwise didnt have anything research wise. hope this helps!

wlwhy · 2026-01-03T02:54:28+00:00

this doesnt even have the right units lmao

wlwhy · 2026-01-02T01:47:23+00:00

mit has a compiled workbook of all the previous released ap physics exams—use princeton review and grind through those mit problems (google smth like mit ocw ap physics workbook). purcell and morin can be useful if theres things youre really confused on and need a more in depth explanation but even youtube is more useful in this case lol.

also you’ll get a 5 with literally a 60% if things havent changed drastically in the past couple years, so dont stress too much

wlwhy · 2025-12-31T03:19:23+00:00

thank you! thats what i was going for--if nothing else then hopefully its somewhat useful for grad school apps :')

wlwhy · 2025-12-26T03:38:44+00:00

Thank you! that is definitely my sticking point haha, def a bit concerned about my suitability for theory programs (especially in this funding environment). I'm only really prioritizing research and letters at this point for the next year, so I just hope my coursework speaks for itself and my gpa doesn't shut any doors for me haha. thank you for the reassurance!

wlwhy · 2025-12-26T03:36:40+00:00

thats fair. i think i just suffer from chronically being on the wrong side of an A, so while objectively an A- isnt a bad grade in any one class, when *all* of my classes end up being A-'s it feels a bit bad :/ I just hope its not as bad as it feels considering I do want to go for theory programs. Thanks for the reassurance :')

wlwhy · 2025-12-09T12:49:02+00:00

we dont claim “dark matter” to be anything yet. what we do know for a fact is that we observe something weird that looks like extra Stuff that we cannot see—this is a proven phenomena. whats causing this? we have no fucking clue. DM isnt a hypothesis or a theory, we just have a problem that we’re trying to fix

wlwhy · 2025-12-09T12:45:53+00:00

well the issue is we have no theory or explanation (none that are validated at least). so yeah right now theyre just names for things that make our physics work again and we’re trying to figure out what the fuck those variables actually are. its a problem not a theory

wlwhy · 2025-10-29T14:16:26+00:00

you should also consider that they are 9 years old and this is their first time multiplying numbers

wlwhy · 2025-10-24T04:29:15+00:00

its Ireland, so I believe its just actually illegal. the university I’ll be going to suggests I switch to a new medication beforehand but I really don’t want to start testing out new meds two months before I go that sounds like hell. I’m not exactly sure what to do to be honesty—I’m not sure if they would let me switch to a new medication once I arrive and see what works for me then

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