Physics Definition and 987 Threads

What exactly is condensed here?

I'm a graduate theoretical physics student at the (almost) end of his master's degree with a fairly varied curriculum, as I attended both QFT (and sub-courses on qed qcd etc) and GR courses. However in my latest intro to quantum gravity classes I familiarised with tetrads and, after a lot of...

Hi, you all, I open this thread to ask for any recommendation concerning integration as well as ODE/PDE solving techniques for physics. I love mathematics, and I usually read material on pure mathematics (most notably abstract algebra and a bit of topology) but here I'm more interested in the...

The question is on the title. I was just thinking if exist some magazine on physics and maths whose only focus is to publish interesting problems and solutions?

Hello, I'm trying to decide between physics and electrical engineering. I like building electrical stuff, and I like solving physics problems, but my main goal is to try to build power systems that integrate things like what can be found in this paper https://arxiv.org/abs/1401.0520. I would...

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Summary: I always feel so satisfied when I self-study physics. It takes me time to truly appreciate what I'm learning when I'm under the pressure of university exams, but eventually when I understand it, I love it too. However, I can't explain why I love it. Hey everyone, I appreciate this...

Hello, I'm not sure if this is the right place to post my question, however I still want to know. Recently, my teacher asked me the following question: "In which of the cases will the cooling time be the least: 1. the ball is suspended from the ceiling 2.the ball lies on a stand with a thermal...

I'm going into my final year of undergraduate theoretical physics. I have had a bit of a deviation in what I want to do and would really like to work in software development in the future. How difficult would it be for me to deviate from my current position and what steps should I take to to...

I found an article by James Bjorken (https://arxiv.org/abs/hep-th/0210202) which argues that universes with different size would have different physics (like different Standard Model parameters). When applying this reasoning to our own universe, Is this pure conjecture? Or is there some truth...

can you theoretically put a mirror in space, take a photo of earth/dirts reflection and see it in the past?

Hi Folks!I have limited understanding of physics. I am trying to put into words the working principles of a mixer grinder, specifically for making a mango milkshake. So far, these are the steps I have come up with: Where am I wrong? What things have I gotten right? Thanks!

I think part (a) is simple enough. Here is what I have done. (a) ##G=\sigma T^{4}_{s} - OLR## $$ =\sigma (294)^{4} - 160 = 254 Wm^-{2} $$ Part (b) is where I am confused. I think I'm supposed to apply the second relevant equation, in order to get the change in average surface temperature due to...

I want to do a masters related to quantum computing from a physics background and my criteria for the place is: 1. A quantum computing group with experimental realizations and industrial ties. 2. A strong theoretical physics department with research in fundamental physics 3. A good chance of...

I graduated with Physics and Applied math degrees ~4 years ago with a really low gpa ~2.7 with research experience on CMS. I then completed a B.S. in Electrical Engineering last year with a 3.7 and a MS in Artificial Intelligence with a 4.0. Over the past 4 years I've been working as a...

However, I do not understand it at all. Since two point sources at A and B are exactly out of phase. The mid point is a node where the amplitude is zero with zero oscillation. How can part (a) be zero? Should that be a quarter of the wavelength away from the mid point?

I'm a physics graduate from Delhi University, India. Aspirant of Theoretical Physicist . Right now , cleared Clerk in Govt. of India exam. About to get Job. I want to go for some top notch college in USA/Europe for Graduate physics. But also interested in Computer Software Engineering. Want to...

I'm currently pursuing B.Sc degree with major applied math and minor physics. Do you guys think is it worth to switch to comp sci as my minor in terms of employability?

Summary: How fast is the response time? Just a quick question? How fast is response time here?

I apologise if this has been answered before. I am about half way through the mechanics chapters in the classic University Physics I am wondering when I get to the chapters on electromagnetism is it worth reading them if I’m going to be reading Griffiths anyway? Would it be best just to get...

And if there are an infinite amount of frequencies, doesn't that mean that an extraterrestrial civilization could be reaching out without us being able to receive their signals. And even if we did receive their signals, how would we understand their form of communication? What if they...

I am currently on track to do a degree in Physics and Philosophy next academic year in the UK, but have been recently thinking about switching my application to Mathematics and Philosophy. (I am aware I could switch to a theoretical physics, or a maths and physics degree, but then I couldn't do...

let's say i would like to drop by one of my pals on a certain planet, 7ly away. I got to 42 years but it doesn't really sound correct.

I am unsure of what career to choose. I really like Physics and Math, and I have this desire to know more about things, which is what EP has to offer. I think that EP is mainly theoretical and does not teach many practice, but I believe that I can complement this by entering groups in my...

I was wondered if anyone could give me some tips on what to expect going into a career in systems engineering. I completed my undergrad BS in Physics last year and I have worked as a student trainee optical engineer for two years (Intermittent schedule). I just completed my first year of grad...

There is a difference in the questions (amount, difficulty) between fundamentals of physics extended 11th edition and principles of physics 11th edition? And both textbooks treat the theory the same in terms of derivations?

My student needs to select either University of Michigan or UMD for his BS degree in Physics. His goal is to go to graduate school after that. His interests are in Nuclear Physics, in particular Fusion energy. He has a full ride to UMD which is also instate. If he were to go to UMI, he will only...

I managed to master the single variable, multivariable, and vector calculus, linear algebra, and some ordinary differential equations. After that, I studied advanced advanced introductions to classical mechanics and electrodynamics. I'm currently studying waves and oscillations and don't intend...

Hi I am new to the forum. I am a investor, athlete, and a "field physicist." I got a bachelors in physics and Hopefully soon can get a phD. I like to do basic experiments that demonstrates physics.

I am a junior applied physics major. I am supposed to write my thesis topic proposal but honestly have no idea what to do. I wrote a proposal about using bipolar junction transistors to create a dosimeter but there are already studies on it and honestly, I am not sure about it so I am trying to...

here is what i wish to say. basically i am a 23 year old guy who has wasted a lot of time not finishing any course i started and also occasionally trying to be a musician but also did not fully get into that. There were times since completing high school that I found myself very intersted in...

Hi! I'm in my final year of high school and I need to present to a jury a 5 minute presentation on a physics question. I'm looking for a topic that would combine physics and everyday life , similar to explaining ball movement in a given sport through aerodynamics and movement trajectory. My...

Iris electrode The potential distribution in the vicinity of the iris electrode, denoted by ##V(r,z)## is rotationally symmetric. After some derivations, the author arrives at the following two equations: $$\begin{align} E_z &= - V'_0(z)\\ E_r &= \frac{1}{2}V''_0(z)r, \end{align}$$ where...

Summary:: What calculus books do you recommend? Does Thomas Calculus include all the calculus topics? Hi! I'm a 10th grader and preparing for physics olympiads. I'm planning to learn calculus this summer, i self learned prior required topics before calculus (trigonometry, logarithm etc.) ...

Hi, I am solving heat equation with internal heat sources both numerically and analytically. My graphs are nearly identical but! analytical one have problem at the beginning and at the end for my domain. Many people have used the same technique to solve it analytically and they got good answers...

I am using MPLAB X, everything is working great when I work on examples that require smaller or no preload at all, I do not understand why that is the case, is there a limit to the TMR0L? Hello please help asap, my specific case I have: 4MHz crystal -----> 1 / (4MHz / 4) = 1MHz timer I...

I've collected a few starting points (below) but would love to hear from anyone who has their own account! I know TikTok is super popular so any advice on that, in particular, would be greatly appreciated! Thank you. https://www.iop.org/strategy/limit-less/social-media/good-practice-guide...

I gave a short Maxwell's equation history lesson and included a quick explanation of the connection to Maxwell's predecessors. Just wanted to see if I hit those points right. I don't think I made any physics mistakes, but this was a little more conceptual with some calculus flavor as the student...

Hi, I'm learning physics because I love it and I have many questions I'm struggling to understand the difference between laws of motion and universal gravitation Question 1 : For example : every object applies a force to another object like the Earth is attracted to the sun, so is the monitor...

Once a week, on Thursday mornings, donut holes arrive in my office area of the workplace. Except this morning - when Tuesday became a virtual Thursday. The exception to an otherwise universal constant prompted me to examine the physics of the donut hole more closely:

I recently watched this video by David Tong on computer simulation of quantum fields on lattices, fermionic fields in particular. He said it was impossible to simulate a fermionic field on a lattice so that the action be local, Hermitian and translation-invariant unless extra fermions get...

hello, i struggle with this kind of questions and i don't understand the way of thinking and how to solve this. in the first picture i don't understand why Moments about point Aare a*F1 because there is the 2 P forces that do moments.? in the second problem i can't understand why there are 3...

do you think there are biological limits to our capacity to understand physics or mathematics?could it be that in the distant future, no scientific progress could be achieved using the human brain, and we have to depend on superhuman level ai to do the work for us?

I was wondering if there is any such textbook which shows how a real physicist actually goes about developing models and or theories to explain experimental observations. I want to see how it is done in practice. Is there such a book? At a level that an undergraduate can understand. It is great...

Hello All : in the near future i will have few interviews as lab assistance and lab apprenticeship , mainly physics labs , do anyone have a source on lab devices to review before the interviews ? maybe i won't be able to find all my old books or internet links Best Regards Hagop Bulbulian

I'm a graduate student and am interested in learning computational solid-state physics. Ideally, I'd like a textbook which covers solid-state physics and the time-dependent semiconductor Bloch equations from a computational perspective. Does anybody have any suggestions?

Summary:: This is similar to the examples of electrical circuit state space analysis, I have been trying to find the state space equations from the following non linear first order differentials but I keep getting stuck. Any help? A) Started off from non linear equations: $$y' =...

How to represent this system in state space form? where: $$ x' = Ax + Bu \text{ and }y = Cx + Du$$ I am trying to create a state space model based on these equations on simulink, need to find A, B, C and D but like I mentioned, i cannot find the solution when the differentials are not of...

My method is silly but here is my attempt Initially we know that the kinetic energy is k = ##1/2mv^2## and the final kinetic energy at the moment before splitting is equal to ##(k + 3k/16)mv^2_1 = (19k/16)mv^2_1##. Substituting the value k to the second equation gives us ##v_1 =...

I am have some questions that have arisen while reading an old but interesting article by Andreas Albrecht [1] that cites an article by Andrei Linde in the 90s on cosmic inflation [2]...Albrecht's paper is related to his ideas on "clock ambiguity" in which he proposes that the laws of physics...