So.. I am currently in need of a book reference which would have a deep insight of mechanical physics (just like Griffith's Electrodynamics for Electrostatics) for Mechanical Physics at Undergraduate level

Do you have any ideas? I want to understand the reasoning well, the direction of the current is clockwise and the force is vertically upwards.

Hello community! My friends and I are trying to do a simple modern physics project on desmos that we’re too lazy to do. Should take about 2-3 hours, and we’ll pay you 60$. Let me know if you are interested. Attached is the project guidelines.

Ok I am not a physics student but we are forced to take the QM course and I did most of the QM from this book but not sure if my solutions are correct and on point. Any help is appreciated.

Taking E&M currently, statics for the rest of the fall and dynamics in the spring all out of Griffiths, I don't hate the textbook, but I feel I would do better with some supplements with more worked examples and just some alternative explanations.

Also if you have any recommendations for textbooks which use Einstein summation convention and/or "extended/advanced" esc(?? Professor went on about this for two lectures and completely lost me lmao)

Appreciate it!

Hello everyone. I want your advice about how to do an experiment to show vapor pressure differences between two different solutions separated by a semipermeable membrane? Raoult's law states that different solutions have different vapor pressures. Osmosis is able to separate two different solutions. Theoretically, this vapor pressure gradient generated at fluid air interface between two different solutions can create a cycle for energy harnessing? Thanks with best regards Dr. Hewa

Hey y'all!

I'm a junior physics major in a fairly small program, and next semester they're offering guided self-study deal over General Relativity. From what I gather, it'll be like a "flipped classroom" situation where we read on our own, have weekly discussions with the professor, and (hopefully) have some problem sets throughout.

That aside, I'm wondering how I should prepare over the winter break. I have taken and am comfortable with the three calculi, differential equations, linear algebra, and an intro proofs course. I have been exposed to tensor notation in classical mechanics but I'm nowhere near comfortable. I have a working understanding of special relativity but I'd probably get a low B or a C on a sophomore SR exam if I had to take it now.

Which issue is more pressing to rectify, the math or the SR? And what tools/resources are available. I have my old modern physics textbook (Felder and Felder and I've found PDFs on Leonard Susskind's Theoretical Minimum books for SR and GR. Is this enough? Or should I look for more advanced materials to prepare?

Thank you for your insights!

Is this loss?

Hey All,

I'm a freshman physics major located in the Bay Area. I don't have any research experience or anything like that, so I was wondering what opportunities there are for me this summer (preferably remote or local) to help me in my career (Physics, Engineering or something in tech, I'm not totally sure yet) For what it's worth, I do think I will get pretty decent grades this semester and I do know a little bit of Python. Any help is appreciated. Thanks!

I don't have a resume either 💀

I'm applying to about 15 US PhD programs, all of which are in the top 25. Only a couple do not accept the PGRE; for the rest it's optional, and for some of those (e.g. Caltech, Stanford), it's recommended. I'm applying for computational/theoretical condensed matter.

Here are my stats:

• 4.00 GPA. I did my lower division coursework at a respected community college where the top grade is an A. I've been doing my upper division coursework at a state school ranked in the top 50 for physics, and some classes there award A+ as the top grade. I've obtained the highest possible grades in all of my courses.
• Several scholarships, three of which are merit scholarships for physics/mathematics.
• Research experience at one of the major national labs (one summer full-time, and then about a year of research part-time after that); REU at a school ranked in the top 20 for physics (still working on the project from that).
• Participation in a competitive bridge program run by one of the top theoretical physics institutes.
• I expect to have three great letters of recommendation.
• I'm a nontraditional student - I already have a separate B.A. in philosophy from an Ivy, as well as a J.D. from a top 5 law school (doubt this will mean that much, but figured I'd mention it anyway).

Based on the threads I've read, I'm leaning toward sending it, since while not amazing, it's still a pretty good score, and at least it will ensure that no one suspects I bombed/would have bombed. At the same time, given my great GPA, I wouldn't want it to detract from my application either. If anyone has inside knowledge of how admissions committees tend to think about this these days, I'd great appreciate it.

I am in my 3rd year of physics undergrad degree (taking all second year courses), I am currently taking calculus 3 and got a 56% on my first midterm where the average was 42%. I just got out of my second midterm for the class and know that I couldn’t have gotten over 30% on it. I made absolutely everything up because I didn’t know how to do any of the questions. I studied for 3 days straight and still didn’t know how to do the questions without looking at the textbook. both midterms are worth 15% each and i’ve gotten 100% on almost every assignment for which they are worth 20% total. I feel so defeated and I’m so worried I’ll never memorize everything. The final is worth 50% and it’s in about a month. If anyone has any tips on memorizing everything from this class and passing my final with at least a 75 I would really appreciate it.

In currently in my intro to QM class, and I really want to learn the topics, but am struggling with how griffiths is explaining it. Does anyone have book recs that are a bit simpler to understand and master the basics? Thanks!

Say you are looking at 3 spectral lines from a single object like a galaxy, should the redshift z be the same for all three lines? Why or why not? If they are different, wouldn't that lead you to three different values for the velocity of the galaxy? How would that make sense- I would think they'd get stretched the same amount, thus leading to the same ratio z. Even the Δλ wasn't exactly the same. Maybe they were measured from different parts of the galaxy so from slightly different distances? or is it just measurement error?

We were given the rest wavelength of each line, and the measured wavelength. I calculated redshift z then used v=cz to find the recessional velocity of the galaxy based on each line. They were all slightly different, with the longer wavelengths resulting in a lower velocity. Not sure if that pattern is coincidence or not.

(I already completed the problem I'm just wondering why it makes sense (or doesn't?) to get different values)

Hello, this is my first year teaching AP Physics or any physics and I am having to relearn it all.

The problem is from Openstax University Physics Volume 1 Chapter 5 number 55.

https://preview.redd.it/e3b8ifjlu22e1.png?width=1656&format=png&auto=webp&s=5b41e7032a4434b8c2083f3a926862034d86131b

Here is the posted answer:

https://preview.redd.it/vccw2tfmu22e1.png?width=730&format=png&auto=webp&s=d05a57bc1d6b271a8793eb2c6d49dc0aad1c60f7

My question is, they asked for Tension and then said that the Tension was T. Then they state that T is mg which I get, but then they state that F = 2Tcos(theta). Why are we finding F? Where did that come from in what they asked and why is it important?

Thanks for your help!

Suppose a ball with mass m is at R distance away from earth centre
its kinetic energy at that point is zero but it will contain potential energy right?

Now this potential energy will be = -GMem/R

So at distance R total mechanic energy is equal to =

1/2m(0)^2 --GMem/R=-GMem/R

WHAT DOES NEGATIVE TOTAL ENERGY MEAN
& WHY IT FEELS WIERD

my understanding is potential enegy is basically the maximum kinetic enegy a partcle can acheive at that point *-1

Does anyone have a good recommendation for a new laptop?

Preferences: 16”+ Laptop, (open to touch screen), long battery life (I play Nancy drew games on my laptop at most)

Currently using a 2019 MacBook Pro & looking to upgrade.

Hello, my ultimate goal is understand quantum physics, and nuclear physics. However, I do not have any education past high school. I work a lot and can’t go to school right now, but I am hopelessly fascinated by physics. I want to learn on my own, and I’m wondering if anyone has advice about the order in which I should learn the topics. Where do I even start? What books or websites would you recommend? Thank you guys in advance for the help and for reading this far 🙏

I'll be starting grad school (physics phd) in Jan 25, and frankly I'm slightly concerned. While I am definitely excited to start this journey, its been quite awhile since I was in school as I have spent some years working in a completely unrelated industry.

I tried doing some revision but it felt kinda overwhelming, and the main thing I'm scared of is starting grad school and appearing to be just some dumb guy...

Does anyone have any advice on how I should handle my (very short) time before starting grad school? Thanks!

I’m really struggling in this class currently and I am trying out different study methods or resources that can help me learn the concepts because god knows Pearson isn’t cutting it.

Are there any good resources to learn how MOSFET works? I’ve been reading my school’s textbook and I don’t really get how it works.