Motivate me to revise first year degree physics
I'll bump with picture of what I've done, each page of notes I write
>pic is my desk
>>26576019
why would i.. if you can't motivate yourself and need people to praise you then you should just die....
don't take it personally, no sentiment behind it.
>>26576019
There is no point in studying. Most degrees are worthless, especially if you are in america and you'll probably end up with a shit job anyway.
>>26576176
I don't disagree with you. I wrote a rough draft of my suicide note yesterday.
Just thought it would be nice to talk to someone today.
>>26576216
I dropped out of my degree and are currently neet. I want to learn because physics is interesting as fuck. I just struggle with procrastination.
>>26576019
What else were you going to do with the time?
Thats what I tell myself, but I still never do anything.
>>26576237
If you have to do it, i think the note is a bad idea, just say you are gonna travel around the world.
If you must an hero, do it in a remote location.
>>26576237
I often write suicide notes just to imagine how people would react
>>26576283
Why
>>26576259
I just wrote you a big reply, but when I went to delete the last word it sent me back a page, and now the reply is gone.
Sorry
>>26576283
>>26576324
I probably wouldn't use a suicide note, I'll just disappear. But it felt reassuring to write one. Like one day soon I'll have the courage to do it.
>>26576324
Doing an hero in your hometown or your local area will bring a lot of fuss and trouble to everyone in that location. So if you can avoid it, people will appreciate it, when suicide happens police need to investigate and need to go around troubling people.
Nobody has to know about it, nobody cares.
>>26576346
i feel you
>>26576346
Don't worry senpai, I'll pretend I got a response anyway.
Personally I'm going to learn how to cook!
Tomorrow!
>>26576462
https://www.youtube.com/watch?v=Z-cT8Qe7y3k
https://www.youtube.com/watch?v=ZXsQAXx_ao0
I find these two videos helpful.
If you're going to learn how to cook tomorrow, make sure you have all the ingredients you want to use today.
Order them online if going to the shop is too much.
>>26576389
I hadn't thought about the impact of a police investigation.
There's this place in Asia where people commit sudoku by jumping into an open volcano.
Would be a convenient way to go, and it would have a 100% success rate.
>>26576534
ow wow, that's a really clean way to do it
Bump. I'm actually trying to major in physics too.
>Buxton water
Mah nigga
>>26576595
Best way that I can imagine.
All other ways that don't require human interaction involve getting eaten by maggots/animals/crabs at the bottom of the ocean.
>>26576628
How're you finding it? I got ill for 3 weeks and fell so far behind, and lacked the motivation to catch up in my own time.
>>26576683
u kno it
>>26576501
I know what I need to get and where to get them, plus I don't have anything else to do for the day.
Going to the shop is rough, but i'll manage.
Good luck with you revision senpai.
>>26576019
>first year
If your in uni first year counts to nothing. Just pass.
>>26576737
well no, you can go into the wilderness overdose on sleeping pills and let the animals and the ground eat you.
You say you're going on a hike give them a different location, and pack your tent, spend one night outside, sleep on it, and if you are convinced take the pills the next night and do it
>>26576761
Thanks man, good luck with your cooking. I hope it's delicious!
>>26576774
I dropped out of my degree, but the first year didn't count towards anything.
>>26576776
>don't involve getting eaten by maggots/animals/crabs
The whole 'sleep on it' never seems like a good idea. I know that if I die I will feel 0 pain afterwards. If I feel okay the next day, I know that in a few hours/days I'll want to kill myself again.
Just do it.
i'm a physics major and top of my clsss. i recommend just study maths first:
>linear algebra
>calculus
>multivariable calculus
>real analysis
>differential equations
>>26577077
Cheers for the advice.
I'm okay at all of those, I just need to write it all up, which is what I'm doing now.
I'm bad at remembering formulas, things like the different integrals of trig fuck me up.
As long as I have an understanding, and the ability to quickly look up to verify the maths that I want to use, I'm happy that I understand the subject enough.
>>26577077
If you're still here, can you tell me why there's an additional r^ on the first gravitation equation, and how r^ differs from a regular r with a vector arrow ontop of it?
>>26577369
Ignore the first bit.
>how does r^ differ from a regular r with a vector arrow on top of it?
>>26577369
r hat is a unit vector (an arrow with length 1). r with an arrow does not have length 1 in general.
>>26577390
you can ask me whatever questions anon. i'm bored today.
>>26577422
it's useful because it's just the 'direction' part of the vector.
>>26577422
Not too sure what you mean by length 1?
From what I've googled, the hat just means a vector that is normal to a curve/plane/surface. Is this correct, and how do I know what curve it is normal to?
>>26577508
it means length 1. sometimes 'normal' is another word for length 1 and sometimes 'normal' means perpendicular/orthogonal to some line or plane. you know how vectors have magnitude and direction?
the magnitude of the vector is 1 when it has a hat on it. so r hat is in the same direction as r arrow but it has length 1.
>>26577547
So the r hat is just giving the direction and nothing else?
So in the gravitational equation, the r hat is in the same direction of the force, which is towards the centre of the planet?
It's basically there just to balance the vectors of the equation and for clarity?
>>26577508
What is important is that the strength of the force is given, up to a constant, as something that decays as 1/r^2, independently from the direction of the force.
This means that if you take the norm of F-arrow(i.e the length), the vector you use to describe the direction has to have norm 1(norm of F-arrow = |magnitude| x [norm r-hat]), otherwise you would get a different value.
>>26577605
at each point in space, there is a force given by that equatoin up there.
just imagine r hat as an arrow of length 1 that has a tail at the origin and points in the direction of the position you're interested in knowing the force at.
r hat points in the opposite direction so away from the center of the planet. the negative sign makes the force point to the center.
it's there to tell you the direction the force points to. sometimes they give a scalar equation and assume you know they which direction the force is in.
>>26577705
so the point is: if v arrow is some vector, v hat is a vector in the same direction but with length 1 or 'unit length'
>>26577705
>>26577622
Okay, thank you. I think I understand.
How am I meant to know which direction the hat is trying to point in other equations? Or will I be given enough information that it's obvious? I've never had the need to use the hat
>>26576019
quit school and invest your money elseway
is a /revision/study/ general a good idea?
>>26577783
The letter used should be known from the context, the hat should tell you the length of the vector is one(perhaps you've encountered i-hat, j-hat, k-hat by now).
>>26577769
Why do they have to be in the same direction?
>>26577816
It's just a notation. If you have any vector v you can always normalize it by multiplying it by the inverse of its norm. The direction will stay the same.
>>26577814
Sounds amazing desu
I think it would help people on the board to get work done. As long as it doesn't turn into "Do my homework pls /b/"
/sci/ and similar boards have a shit fit if you ask them questions
>>26577816
that's just convention. e.g. if i gave you w with arrow on top, then i write w hat, it's understood that w is the vector in the direction as w with magnitude or length 1.
>>26577783
you'll know. e..g in that equation up there, r with an arrow on top is the position vector (ie the arrow from the origin to the position of the point in space where you are interested in knowing the gravitational force
>>26577854
what would such a thing consist of? It'd be pretty cool to have a place to dump your notes after each page, so you can help out people doing similar subjects and also get help from people that notice mistakes in your work.
Asking questions would be good too
>>26577815
I have, and i can work with those terms, but i've never encountered anything in which i couldn't calculate without the hats. I've had no use for them, and could do whatever question just as well without them.
>>26577848
you're confusing the fuck out of me, you're using the words normalize and norm to mean the normal? Or are these completely different words?
>>26577875
Hm okay. I'll have to practice some questions before I understand the point of this.
I'm guessing it's stupidly easy, but everything I've read is conflicting and I'd need someone to draw me some pictures or for me to ask them 20 stupid questions in a row before i understand
So because I know that the force is towards the Earth, r-hat has to be away from the Earth because the equation has a -.
So the direction of the vectors and hats have to be the same on both sides of the equations, and are both influenced by -'s?
>>26577939
>dump notes after each page
no, please don't. i'll answers your question but in return i want a humourous image.
>>26578050
>you're using the words normalize and norm to mean the normal? Or are these completely different words?
they are different, by norm in this context I mean the length of the vector
I think people should use perpendicular or orthogonal instead of normal which is confusing.
>>26577939
Taking before and after pictures of what you're doing.
Even just showing people that you've tidied your desk, or showing some maths, or an essay, or a drawing and have people tell you well done.
All just comfy working, people asking questions about others work, and asking for help.
Lots of pictures, lots of encouragement
>>26578082
That's where I'm getting confused.
I use perpendicular or normal interchangeably. Never used norm to mean the length of a vector, magnitude instead
>>26578050
normalize means to take a vector and turn it into a unit vector by dividing by its length.
norm is the same as magnitude or length.
>So because...
first you have to understand what r arrow on top is. r arrow on top is the position vector. and r hat is the corresponding unit vector. so when you look at that equation up there it is saying the force of gravity is in the opposite direction as the position vector and has that magnitude GmM/r^2.
>>26578137
make a thread then.
robots don't want to be robots. the only ones who want to remain robots are mentally ill. the ones who go 'ree normies' unironically are literal retards or newfags.
>>26578176
So if my picture correct?
If vector r = 10m,
vector r = 10* r hat
>>26578333
I might do, I'm bad at making threads. I'm too self centered in the way that i write and no one wants to reply to me
I've said 'I' 6 times in this reply to you.
I'll keep it in mind and give it a go in a few days maybe.
>>26578380
yes you get it now. but the first equation doesnt make sense since one side is a vector and the other is a scalar. if the first equation was |r| = 10, then yes. oh another convention commonly used is to use r instead of |r|. e.g. if i gave you v with an arrow on top, v would mean the length or magnitude of v wtih arrow.
>>26578415
Thank you
So how would I write it if I wanted to say that vector r had a magnitude of 10m?
>>26578510
r = 10 m or
|r| = 10 m.
you have to be flexible with different notation. it's like words how the meanings depend on context.
>>26578510
i've answered your questions, now post a funny picture as stated in our contract.>>26578074
>>26578603
desu i won't worry about pedantic notation like bothering to do |r| just for notes, as long as I understand what i mean
i'm never going to use physics for anything other than fun
pic isn't funny, but i've always enjoyed it
it's also relevant to the thread
>>26578657
i dont save funny pictures, i'm still looking
>>26578778
>>26578704
ok, that will do.
>>26578862
don't put me under pressure like that
taking me back to high school days in the classroom
"lets go around the table and everyone say something funny"
any other anons have physics or maths questions? i'll help you out of neethood.
>>26578704
>pic isn't funny, but i've always enjoyed it
It's funny if you imagine the chick to be one of those feminists who posts sexualised nudes and then expects men to pretend they don't see anything sexual in them.
>>26580742
I like thinking about when she was taught about the difference between accurate and precise, that in class she was thinking about her nipples, and a smile came over her face when she decided that later that night she'd draw on herself and take a picture.
>>26579650
How do I integrate this?
>>26580957
I'm guessing it's one of those impossible integrals used to bait undergrads on /sci/ and /b/?
I'd give it a go if it used x's instead. It takes 10x more processing power if it's not in x's.
>>26580995
I only took calc 2 literally forgot everything. I'm not a math or physics major tho.
>>26579650
Solve and get Nobel prize in mathematics.
>>26580957
Yeah. Just use a wolfram alpha or some shit. If you teacher expects you to do this by hand, he's an asshole.
>>26581234
Nope gotta do it by hand m8
>>26580957
Differential Equations? Looks like the stuff I saw in that course.
Of course first you'll want to seperate the two portions inside the inegral, and make two integrals.
Then you'll want to cry and think about how you're using math to avoid the fact that you'll never have gf.
>>26580957
sorry i don't know. just use wolfram.
>>26581763
>Then you'll want to cry and think about how you're using math to avoid the fact that you'll never have gf.
you're hurting me anon
>>26577814
>>26577854
>>26578137
i've made a general about this. let's see how it goes for now.
>>26583502
>>26583519
Nice man, I'm not gonna jam up your study thread with useless posts, but that's a really cool idea. Wish these sort of things popped up more often.
>>26583652
no problem anon. glad to help as i have trouble motivating myself to study, too. perhaps this'll be a help to all us bots with no mates to turn to.
>>26583519
OP here,
again, i'm so glad that you've made the general
i've saved the pic you made
i want this to be bigger than brit feel
