Physics Definition and 987 Threads

I've been lurking on this site for over a decade (especially when my high school students ask me a particularly obscure physics-related question), so it's high time that I finally joined. I've teach in Pitt Meadows, BC, Canada, and I've been teaching for 25 years and counting. I love teaching...

Hello, I'm Bertram and I'm in my last year of school and I would like to study physics, I really like particle physics from what I know. I'm here to connect to other scientists or students, but also to learn more about the subject, common problems and the way of precise articulating. Have a nice...

Nice to meet you all. This year I've realized that I have a very poor understanding of physics because anytime a problem is explained to me, it just goes out the other ear. My physics teacher is an old German man with a demon in his soul, but his class is one of my favorites and is probably the...

How did you find PF?: Years ago online forums were more visible. These days they are left behind social media. I searched Google and now I am here. Why in heat transfer books Fourier's partial differtial unsteady state heat transfer equation is solved with seperation of variables but not with...

Hi all, Mechanical engineer by education; soon to have a MPhil in Architecture. Building Scientist/ Energy Efficiency consultant by trade. I have a decent physics background, but not an expert around the subject of radiative heat transfer. My posts will likely involve confirming bs from...

I've arrived to an expected answer, but I am not sure at all that the process was what the problem statement wants. First, I considered ##0=(t+\delta t)^2-(x+vt)^2-(t^2-x^2) \approx 2t \delta t - 2xvt - v^2t^2##. Ignoring ##O(v^2)## gives ##\delta t=vx##, i.e., ##t \rightarrow t+vx##. Keeping...

Hello everyone, my name is Physics-nya (which is a combination of "physics" and "the sound a cat makes" ), because I was attracted by the famous thought experiment "Schrodinger's cat" and has made up my mind to learn physics at an early age. I am now a senior high school student of grade 12 in...

Hello. I am a Physics teacher currently in Kathmandu. I am experienced in Edexcel IAL and in the past CIE and IB DP. I think a lot about the meanings of numbers, but have poor math skills in terms of calculus but am strong at spreadsheet modelling.

Hi! I'm new here! Let me introduce myself! I am Thomas and I have always been interested in science, cosmology and physics. Anyway, I have an equally strong passion for arts and humanities, and after all I decided to form myself as a journalist, which is my daily job. After years and years, I...

Im trying to find someone or a company who can do some calculations for me. I started with a fluid dynamics modeling company and they felt I would need a physics calculation. I need to a foam golf ball to be picked up by a column of air and held in place at aprox 10” until it is knocked off the...

Hi, I solved part (a) and will provide my solution below. However, I've been working on part (b) for quite a bit and reviewed the provided, relevant text a few times now but haven't been able to find what I'm missing: Solution (a): Using ##A = \frac{\pi \times d^{2}}{4}##, ##k =...

Hello everyone! I am a returned student after 15 years of being out of school. Physics is very challenging for me, especially taking it in a different language. I like this forum because the instructors here don't just give the answers to the problems students ask, but they help the students...

hello! I'm currently in an Intro to physics class, and I'm not the most physically inclined. I look forward to learning from you all!

Hi there! My name's Waris and I'll be starting a physics degree in a few months. I've been independently studying undergrad material for about three years. I was out of practice for a while because of some issues at high school but I'm working to get back on track. I would love to participate...

It's just a link, Unreal? [Mentor note: The thread title has been edited to be a bit more specific]

Hi, I'm a new member, interested in physics and relativity and new ways to think about our world. Cheers Chris

My name is Ron Werner, Dutchman, living/working in Norway since 1992. My main interest is geology and I have worked for several museums and mineral-dealers during my life. Since 2000 I have worked for the Evje og Hornnes geomuseum Fennefoss in Evje, in the south of Norway. It is a small museum...

I hope to discuss with everyone who is interested in physics here and improve together! I'am reading Callen's book now,welcome to talk about things in this book.

Hello everyone, I'm currently working on a physics problem involving the rotation of a 5 kilogram ##M=5## solid sphere subjected to a force of 5 newtons ##F=5##, and I've encountered an inconsistency in my calculations. I'm seeking guidance or insights into where I might have gone wrong. My...

Hello! Using concepts of physics 1 like kinamatics, dynamics, circular motion, pressure, newton's laws. Make me a physics question that needs basic calculus like integrals and derivaties to solve!

The Q My "working" The answer is simply 2820 N

Hi, my name's Cass. I finished my bachelors in physics last year. Kind've floating around I guess. I write code, play guitar, make art, and study Japanese. I hope to spend some time away from school and get my priorities straight then maybe go back to gradschool eventually. Nice to meet you!

Hello there, I am Mufeez. I am currently enrolled at QAU in the field of zoology. Didn't plan to study zoology so I am gonna drop it and try to move towards my main interest that is physics. Joined PF to learn physics and get help and make connections. Hope ya'll have a good day.

i dont know how

In a Michelson Interferometer when Mirror 1 is moved a distance Δ𝑑=𝜆0/2Δ, this path difference changes by 𝜆0, and each fringe moves to the position previously occupied by an adjacent fringe. Δ𝑑=𝑚(𝜆0/2) I also know from the equation for I0=2I0 - 2I0 cos (2kdL or 2wt) that the fringes shift by a...

Be nice.

Distance and weight are two separate things so....the question cannot be answered?

Startups in avant-garde technologies.

The question What I did The answer

A thought (it is probably as old as hills, but new to me): Physics advances by finding rules our observations obey. A good theory reduces the information needed to describe what has been observed. In each (most?) advance(s) we find that the universe actually contains (can be defined by) less...

I did this too fast idk if I'm wrong So for the x component use the formula d = rt / delta x = v*t 26 = vcos(theta) y component use the displacement formula 19.6 = vsin(theta) tan^-1(19.6/26) = 36.5 degrees the answer key says 20.2 degrees idk whats wrong

(a) x = 16.7 Since x > 4.88, k = k_2 = 111 N/m. T = F(16.7) = k_2*x = 111*16.7 = 1853.7 N The answer key says the correct tension is 2320 N. Any help is appreciated, I'm not seeing where my math is wrong.

Hi, I am Ranish, Looking to learn more about Physics and ideas and to find answers for the questions surrounding it. Thank you for the invite i hope i can learn a lot from here, Thank you

Hello. I was wondering why do we not multiply cos(alpha) by 2. I believe we should do this since the y-components of the electric field cancel out, meaning there would be 2 x-components of the electric field(at least I think so). Currently, this derivation/answer only considers one horizontal...

Using elastic equation I think the box and the block would stich together [Mentor Note -- Sideways, dark image fixed up]

I am an enthusiastic physics student in undergraduate level.

Hi all! I'm a Maths and Physics student at the Open Uni currently (doing a B.Sc.); It's online because of health problems, which prevents me from travelling a lot. I'd like to study theoretical physics in the future. My main goal is finishing my B.Sc. (of course) and trying to find a Maths and...

Hi! My attempt at this solution was: ∫dF = k*q*Q / 2L ∫ (1/r^2) dy and we know that r^2 = D^2 + y^2 based on the diagram. Here is where I start getting confused. I looked at a different physics forum post and the mentor gave this equation: I am mainly confused with the math. How did he end...

Phillip Morse (of Morse and Feshbach) wrote this preface for the preliminary* edition of his book Thermal Physics. It has some interesting comments about curriculum reform. * First time I have heard of a preliminary edition of a book

Hi everyone! I'm an A-level Physics student looking for help on a bit of a project of mine.

Hi everyone! My name is andrim30! I'm currently studying theoretical physics in one of the universities in Netherland. I'm here so i could talk about physics and networking with fellow physicists! Looking forward to discuss with you!

Do Black Holes have Singularities? "There is no proof that black holes contain singularities when they are generated by real physical bodies. Roger Penrose claimed sixty years ago that trapped surfaces inevitably lead to light rays of finite affine length (FALL's). Penrose and Stephen Hawking...

Hey, I'm in my second year at university and hope to find help (and offer my help) with solving difficult physics questions.

Do not discourage me after reading this but please listen. I always loved maths and physics but i hated Organic chemistry so in order to avoid chemistry i ended up choosing commerce with maths. Now, I am in 2nd yr of my college doing BBA. My class 11th and 12th was in lockdown so i did not...

I am quite interested in math and physics and keep on trying to discover new stuff. I recently learnt badic calculus and i find math cool

Hello everybody! I signed up to this blog a long time ago but I don't think I ever made a post in here before. I finished my degree in Physics more than 5 years ago, started my PhD but never finished it. After that I moved back to Angola and followed a careers in consulting and on the financial...

The correct answer is u=vcos\theta. I have understood so far to be able to conclude that \text{displacement of string} = PA - PC \approx AB Also, \overline{AB}=\overline{AC}cos\theta or, more generally, \vec{S}_{along\ the\ string}=(\vec{S}_{along\ the\ horizontal})cos\theta Now, I had hoped...

Just out of curiosity, has anyone tried to find out whether the male/female/other ratio here is similar to that in the general physics community? It seems to me that everyone I've engaged with on PF is male! Food for thought?

Let us try to promote some physics history in this sub. What are some anecdotes in the history of physics that you want to share? Be it a true story or a popular myth. I'll start: I recently tried to check if the story of Schrödinger's equation was true: Schrödinger going out for the...