Introduction Definition and 848 Threads

What exactly are the theoretical motivations for considering space and time as a four dimensional continuum? Is it a natural consequence of requiring that the speed of light is independent of the frame of reference that it is measured in, since this implies that time and time are not absolute...

Hi... my name is Unique. I study Bioengineering and Technology in University of Indonesia. I have assignment in Product Design, I hope I get many information in this forum. thank you^^

Hi people, name's Kano, and I will be burdening you all with questions from now on :)

So hi

Hello everyone at Physics Forums, My name is Andrew; I'm an undergraduate student currently pursuing my B.S. in mathematics. While pure mathematics is my main area of interest, I've gained an immense appreciation of physics as I've been self-educating myself with Feynman's lectures and a few...

Hello! I really like physics but I've been reading pop science books up until now. I feel like it's time for real math based physics. I'm a first year ME student so I have calculus and phys 1&2 covered. I was planning on reading Feynman's yet I've heard it might as well be supported by some...

Hi, I am Aakash for 3rd year ug from IIT Kanpur in department of Mechanical Engineering

Well, hello there! As soon as I had finished signing up, a message in my inbox showed up and encouraged me to introduce myself to the board. So, here I am! And, seeing as I'm a fan of backstories and origins, let's get on with it, shall we? I'm from Greece and I'm currently taking my final...

Hey, my name is Aditya and I am a sophomore in high school. I am currently enrolled in AP Physics and I really enjoy the class. In the future, I hope to pursue a career in research and space applications.

I started out as a physicist, but moved to mathematics when I first ran into quantum mechanics. I retired from the military after 20 years. Jobs there included launch officer, trajectory engineer (rocket science), nuclear weapons effects, nuclear war planning (both theory and analytics), then on...

i am preparing for masters in physics after completing an engineering degree in electrical engineering. Messed up my degree because after a year of entering it i realized physics was really my calling, but due to financial constraints i simply could not leave engineering and pursue physics in...

Dear All Can anyone suggest me a book as a basic introduction to supersymmetry In fact i have Wess and West but i need other. Thank you

Hello, Per your guidance I'm running through the 2nd edition of an introduction to mechanics. I'm only in the 1st chapter and all the problems are conceptual with no sign of answers. Does anyone know where I can find a manual? Or maybe an alternate source of problems with answers?

Hello, fellow physics-lovers! The name's Brandon, 25 years old, and currently majoring in physics at the University of Oxford. My daily activities when not attending lectures, doing work, or studying include PC gaming, exercising, browsing the internet, and drinking water (I love water, if you...

A textbook or even better some openly available pdf would be preferred. I have no idea where to start a search and I normally prefer recommendations over just picking any book from some publisher. Thank you.

Hello I am Farhad! I am currently in gymnasium, I am not very bright with mathematics and I study Natural sciences :) Even though I am bad at mathematics, I still love it and my main focus is to work with Synthetic biology after I graduate and move along to university.

Greeting, Physics Forums. I've signed up as a new user in order to try and find some answers to solving some artificial simulation physics. I did catch that that content does not go in this thread or sub-forum and will shortly post my question in what I hope is the correct location.

Hello, all! My name is Marina and I currently live in Honolulu, HI. I'm an ocean engineering major, but my primary interests are in astronomy and astrophysics! I'm hoping to meet a lot of people here that can help me deepen my understanding of those subjects, and maybe even find some people...

Essentially I'm just a person who is interested in how the world works and how it can be used to benefit humanity. I'm presently a College freshman but I worked as a research assistant at my college. I'm sure who ever is reading this really cares but I'm shooting for a major in Electrical...

I have access to a copy of the first edition and would like to use this book to strengthen what I've learned in my first physics course in Engineering school. I know there is a second edition though, and I was wondering if the difference between the two is large enough to justify just buying...

I am Debbie from Philippines. After graduating I've been detached from the world of Physics (not totally though) and has been working. wanted to keep Physics side of me alive so I'm here to resurrect it.

In his book, Euler gives the definition of a variable to be : "A variable quantity is an indeterminate or universal quantity, which includes within itself all completely determined values." What does he mean exactly in the last part of the sentence?

I am a high school student who likes science very very much. I Need a resource which can help me understanding science

Hi all! I'm Garrett. Halfway into my 3rd year of study at university, I'd consider myself interested in grappling with some of the deeper questions of reality, and terribly aware, of how much support such endeavors require. Well wishes, GS

Good day all, I've been a lurker for years but for some reason never joined despite often finding helpful advice and explanations on the forums. Glad to finally be joining and hoping to provide some helpful insights to others in the admittedly few areas where I have the facility. And of...

Hello Everybody! I'm an applied mathematics researcher who found out about this website through the courtesy of one of my awesome students. My main degree is in physics, but afterwards I have been leaning more and more in the direction of mathematics and programming. Most of my work orbits...

Hi, I have always been presented with a description of photons (and electrons more recently) as being entities that at times behave like waves and at times like particles (and I understant that typically particle is a substitude word for small little solid object of mass). So I would like to...

This is a very fundamental question. I apologize for its simplicity. I did searches on the web but could not find a clear explanation. Whenever I read about the principles of quantum physics, I always come across a statement along the lines of: "electromagnetic energy could be emitted only in...

I have a gazillion questions and I love feedback positive or otherwise as long as it is constructive and on point. I am not allowed to ask any at the moment- Bites nail in despair, but I am here to say a few words about me- First off I am wildly immature for my age which is half a tree by...

Greetings. It's my pleasure to introduce my self..well, I'm Ayran Thane Olckers born and raised in South Africa, Currently living in the UK. I am not new per say, however I never introduced myself on the forums. I am currently studying a BSc Natural Sciences at Open University, pursuing my...

Hello ,guys ! Nice to meet you in the forum .I like reading ,climbing and making friends. I hope to make more friends here !

Hi, my name is Aaron and I am a fourth year Applied physics undergrad in Ireland. I am studying DFT-D for my final year project and hope to continue on to become a postgraduate next year. My interests lie in condensed matter, computational physics and optical microscopy.

Hi, I studied 'A' level physics back in the '80s, my dad was a physics teacher, and I have an ongoing interest in the subject. I'm particularly interested in optics. The main thing that I remember being taught incorrectly at school is that white light is a combination of red, green, and blue...

What are the essentials to starting on this topic from the very beginning? What are topics I should have covered before starting? Suggestions please? Thank you.

My name is Marc. I live in Belgium and have graduated as a chemical engineer in 1991. I have had a broad interest in anything related to engieneering and physics, but must admit that I have forgotten a lot since I graduated.

I came across this forum after doing a Google search. I ended up in the biology and medicine section which I found interesting. I decided to sign up since it seems like a good forum to learn and have intelligent discussion.

Hello! I'm Reece, an aspiring Doctor and Surgeon (hence the "Dr." in my nickname). I am 16 studying 5 AS levels which are: Biology, Chemistry, Physics, Mathematics with Statistics, Further Maths. I have also studied and still study other subjects unofficially for my own interest, those being...

I really like physics, but I struggle sometimes and have found threads from here helpful in the past, so I finally registered. I hope to be able to help others and get help as I progress in my classes! Nice to meet you all, I go by Mel.

Hello, I am The Darkness. I don't expect to be extremely active, but I will asks questions every so often. Have a good time.

micromass submitted a new PF Insights post Informal Introduction to Cardinal Numbers Continue reading the Original PF Insights Post.

Greetings! My name is Emma Watson. I am From USA. I am Editor at The New Time Magazine. I plan to do some research in Physics. I look forward in participating with this society and share some valuable topics with other members. Thanks Emma Watson

I'm a secondary school student and that is my last year so it's an important one , I hope I go to Cairo University and graduate from it as an engineer .

Hi, handsome jack here. Fresh aircraft maintenance and technology grad student. Hope to learn a lot here

First, I have a question regarding the conservation of probability. The book shows (quite elegantly) that $$ \frac {d}{dt} \int_{-\infty}^{\infty} |\Psi (x, t)|^2dx = \frac {i\hbar}{2m} \Big{(}\Psi ^* \frac{\partial \Psi}{\partial x} - \frac{\partial \Psi ^*}{\partial x} \Big{)} \Big...

Hi guys newly registered member here, looking forward to working with you all!

Hello, Engineer looking to join a forum of like minded individuals. -Katrina

Hi PF! I'm Zephyr007 and I am 14 years old. I love to study Science since it has a lot of things to explore. I also love to test new experiments and debate in a specific topic. The area in Science that I love to talk about is Physics. I hope I could help you in contributing what I know and have...

Hello, everyone! I've lurked around for **years** before even making an account! Being a sophomore, studying physics and astronomy, I'm still so new. I'm so excited for the semester to start. Thanks for all of the wisdom. Miss Carraway

Hi everyone. I'm a sophomore now , majoring in astronomy, and will become junior in no more than 1 month. I have a good command of classical electrodynamics and quantum mechanics. However, I'm confronted with some problems. 1. I want to know more about Astronomy. I borrow Very High Energy...

I am looking for a short pedagogical introduction to Young-tableaux and weight diagrams and the relationship between them, which contains many detailled and worked out examples of how these methods are applied in physics, such as in the context of the standard model and beyond for example. I am...