Physics (from Ancient Greek: φυσική (ἐπιστήμη), romanized: physikḗ (epistḗmē), lit. 'knowledge of nature', from φύσις phýsis 'nature') is the natural science that studies matter, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over much of the past two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the Scientific Revolution in the 17th century these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy.
Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism, solid-state physics, and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.
I have come across an old formula from my notes and I have no reference for it but it is using truncated digits in its formula to calculate the redshift for decoupling. The formula is nearly as accurate as the observed data from Planck 2018.
So I would like to figure out the derivation of those...
Hey!
I want to study physics and math, and eventually, I would like to get a Bachelor in Physics. I quit university about 5 -ish years ago, an Engineering major...I wasn't a good student and don't really remember anything.
A couple of years ago I discovered a big interest in Physics and...
Griffiths "introduction to elementary particles" serves a great introduction as a first course on particle physics for undergraduate students.
But what are the possible alternatives of this textbook? Like being more beneficial in the long run, more time-consuming, for aspired students. But it...
When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 2.19 m/s. The mass stops a distance S2 = 2.1 m along the level part of the slide. The distance S1 = 1.18 m and the angle θ = 28.10°. Calculate the coefficient of kinetic friction for the mass on...
Does anyone know how to do part (a). I labelled the current through R1 I1, I4 through R4, I3 through R3, I2 through R2, and I5 through the 3ohm resistor.
I used Kirchoff’s Laws to make the equations I1 + I4 = 8, 2I1 + 32I3 - 14I4 = 30, and I1 + I3 - I4 = 0.
I solved these equations by subbing...
I suggest we be way more alert and expert when working arguments that are based substantially on semantics.
A recently locked thread (still considered "hot" at the moment) presented a lively debate on the term "path"
as applied to photons.
In a few cases, the passive tense was used: "It's...
Hi, PF
Here is the text I've taken a look at
file:///C:/Users/usuario/Desktop/2001_JMT_Girep.pdf
And the article I'm looking for:
Artigue M. and Viennot L.
Some aspects of students' conceptions and difficulties about differentials,
Misconceptions and Edu. Strategies in Sci&Math. Cornell...
The problem that i am facing has to do with acceleration. The problem states that we have two balls with the same mass m that stands on two different tables. Between these balls are a wire with the length 2l, which i assume means 2 * l, where l is a value i choose. In the middle of the wire (x =...
Hi, the task for me is writing a worksheet about Physics experiments in the classroom with a strong emphasis on Inquiry Methods. If you have any suggestion about it (web, courses, people in the field), I'd be very grateful to hear from you. In the meantime, have a safe day.
hi all! I'm a first-year second-semester physics major, problem is I'm very weak at math, often not getting questions right just because I get stuck with the mathematics part. this affects me in both mechanics and electricity
what are the most important math subject and tools needed for physics...
Hello everyone, does anyone know any online websites/software to draw detailed physics diagrams, Like the ones we see in textbooks and research papers.
I wanted to draw detailed ray diagram of a lens with mentioning all the angles and refracted rays which is supposed to depict a certain...
Einstein's formula for kinetic energy of a photo electron is
$$ KE = h\nu - \phi$$
$$ h\nu = KE + \phi$$
Which basically says whatever energy you provide through radiation, a part of it will be used (but I would like to say 'wasted') in overcoming the work-function (that is in cajoling that...
I have been tasked with calculating amplitudes of a B meson decaying to a photon and lepton/lepton anti-neutrino pair ,upto one loop and have pretty much never seen this thing before. I will ask my questions along the way as I describe what I am doing.
This factorization theorem seems to go thus...
Does anyone know where one can find complete documentation on how to create physics simulations using Geogebra. I have searched everywhere on the internet and there really isn't any books or complete tutorials on the subject.
The result is supposed to be 12,2 m but every time I get 8,016 m... I used for example this formula >r=m/[(density of air-density of hot air)*(4/3)*pi]
For density I used > rho=(p*M)/(R*T)
Am I forgetting something? Thanks in advance.
Hi,
I am doing my PHD in Nuclear/Particle Physics and I am getting all of the information I am using from papers, which are very specific. I feel like I am lacking general knowledge, which is likely to be tested in the defense. Do you know any book where I can get a better overview on Nuclear...
I need help in deciding on a college to attend for a bachelor's in physics.
I live in North Carolina, and I got accepted into the following schools:
Appalachian State University
Georgia Tech
NC State
The Ohio State University
Illinois Urbana-Champaign
University of Maryland College Park
UNC...
I had a homework question recently where I had gotten a bosun chair question wrong. It is the exact question found in this youtube video (with the values changed).
I am struggling to understand the way 2T is arrived at here (though I do understand this is an example of mechanical advantage)...
Summary:: What kind of geometry/Math do I need to understand to read this book?
Hey people!
I would like to know what kind of geometry and/or math would I need to understand this book. I skimmed through it( The translated version by Florian Cajori) and seen that it gets technical with shapes.
Is getting a masters degree in physics worth it or is anything short of a PhD at the same level as a bachelors when it comes to job types and prospects?
[Mentor Note -- thread moved to the schoolwork forums]
Hi. So I'm a Physics HL student in IB and I'm designing a circuit for my Physics IA. (think of it as a lab/project if you're not familiar with IB)
I'm required to have an independent variable of 7 dif. values and a dependant variable. For...
There's a number of "small" (in size) paperbacks which I've quite enjoyed reading, e.g. Schroedinger's <100 page statistical thermodynamics lectures, J.W. Leech's classical mechanics text, etc.
Books of this sort are very portable and easy to dip into whenever you get a free 15 minutes or so...
Hi,
In my old age I've gone back to study physics at college. I own a really old (1976) edition of Feynman's physics textbooks, but the paper has yellowed to the point where I have trouble reading them, the contrast is low even though the print quality is ok.
Is there a printing on good...
Christopher Nolan really has an affinity for Physics! Here's a shot of Cillian Murphy (of Peaky Blinders fame) posing as the eminent physicist J. Robert Oppenheimer.
The film is based on the biography "American Prometheus" and will depict Oppenheimer's contributions toward the development of...
Hello everyone!
As I was saying in my presentation post, I dropped out of my physics degree very close to graduation - a year ago. I will firstly explain the whole context of my studies/abandon and then provide some of the perspectives I thought about.
As an international student in Canada...
Summary:: 12 ton rectangular frame is lowered by a 4 point crane attached to each corner of the frame.
Frame will be lowered onto plastic supports, these supports have guiding ramps of 60 degrees to help the operator lower the frame in the correct spot.
The frame has 4 feet, one on each corner...
(a) When a taut string is plucked with a finger then it starts vibrating with a transverse wave pattern in the string, which causes the air particles in the immediate vicinity of the vibrating string to oscillate. These oscillating air particles will result in a sound wave traveling in 3...
Hello, I recently Graduated as a Mechanical Engineer from the University of Jordan and I am looking to do a Masters in Physics in Germany
obviously I am at a disadvantage when it comes to admission due to my Bachelors, but I am currently fixing that.
I am currently taking Courses in Quantum...
Hello!
I have finished high school quite a few years ago. I did a physics course that went over nuclear fusion and fission, and I quite enjoyed it. However, I unfortunately no longer have those textbooks (I sold them on as many people do). Now I am doing a bit of programming in the field of...
[Mentor Note -- Two similar thread starts merged into one]
Hey all,
I have been working on this project for a while now, which features suspending an object midair through the use of magnetic levitation principles. Cool right? And so I have been researching and trying, even finding ground...
I guess that the reason that objects fall over is that there is nothing to hold it's center of mass. So what I want to do is to work out how fast in Delta intervals it would rotate and fall over.
Water heater has the effect 2kW and is filled with 2kg water, with a heat capacity of 4,18Kj. The water needs to be warmed from 300K to 400K. How much time does it take for it to warm up?
I've tried to solve this, but it seems that i need to know the heat capacity of the water heater, which i...
Hello everyone, I am new here, and I was wondering if someone could provide me with some advice on how I should approach this in a smart way.
I basically really need some bigtime advice on the math part of Physics (or in general). I didn't have anyone to really talk with or that'd be able to...
In this thread, @haruspex presented a very deliberate point about the role of electrons in a nuclear fission reaction (he might have said or meant something else but I will present my version of it). The problem that we have before us can be stated, as candidly as my linguistic faculty of mind...
Hello All!
I recently finished my undergrad but to be honest I actually feel like not learning anything. I could ace the tests because I knew the "pattern" of questions that would come but now if I open an EM textbook by griffiths, I am pretty sure I understand the topic but struggle a lot in...
I have the opportunity to get a Springer book for free, provided that it is cheaper than 200$. I am considering an introductory one about Solid State Physics, but I have never heard about a valid one from Springer (I know about Kittel, Ashcroft and Simon only). Do you have any suggestion?
Thank...
P=mv *momentum equals mass X velocity.
Light particles or "photons" are said to be "massless". And yet they have
momentum. How is that possible? (p.s. I used to know the answer)
I’m sure I’m not the first to ask about this but I could use some advice from the internet:
I am a sophomore lost in the world and somewhat recently decided I was going to major in physics with my eyes on grad school. I am on track to get a math minor but I am weighing the trade-offs of picking...
I'm currently a college freshman studying physics. The only previous research experience I had was a virtual one with the EPA on things not really related to physics (it was about 3D printer emissions). I'm trying to look for something for the summer and I've already applied for a bunch...
At first, I tried to calculate the heat energy required by doing this:
I realized I should calculate heat energy separately instead of grouping glass and water together so I did this:
But the answer is supposed to be 6.29 x 10^4.
I don't know how to solve this. Can anyone help please? Thank you
I am working through the wonderful book called University physics by Young & Freedman, it’s seems like a thorough introductory textbook. My question is, instead of waiting till the end of the book to branch out into more advanced textbook that focus on mostly one topic for example classical...
I assume you people are all so preoccupied with all the hard sciencemastering going on that you're missing out on the more basic [sic] research abundantly present under the "Popular Physics" header at arxiv.org. Particularly:
Futurama, Marvel's Supervillains and Boltzmann Brains.
I'm not...
Without trying to sound too wistful, back in school there was a good selection of miscellaneous problem books like Professor Povey's perplexing problems, 200 Puzzling physics problems, Irodov, Jaan Kalda and all the olympiad stuff, etc. Do there exist equivalents of these puzzle books aimed at a...
Hi,
The solution for this question is
thermal energy lost= thermal energy gained
0.200x450x(300-T)=1.0x4200x(T-20)
T=26 degrees celcius.
However, I am struggling to grasp why (300-T) is used.
I have always known a change in something to be final - initial. Therefore change in T= Final-...
Suppose there is a nonprofit that wants to order a piece of research in theoretical physics. The research is rather small; it consists in considering an issue and writing a 8-10 pages article. The physicist to do the research will be from a high income country; he/she should be an experienced...
I have a doubt regarding the basic function of vectors and scalars in physics-
What is the guarantee that every quantity(measured) in physics can be classified as either a vector or a scalar, and that while performing operations on said quantities, they will obey the already established rules...