I have just come to the realization that the level of my current university physics program is quite low. Though we use textbooks like Kleppner for Mechanics and Griffiths/Purcell for E&M, we are not instructed at all to solve the back problems, and instead concentrate on derivations since those...
In peskin at page 319 right above equation (10.6) he writes
"If the constant term in a taylor expansion of the self energy were proportional to the cutoff ##\Lambda##, the electron mass shift would also have a term proportional to ##\Lambda##. But the electron mass shift must actually be...
Greeting. This is my first thread in engineering zone. Pleased to meet you all
As the topic said. I want to ask about how possible to make animal powered vehicle for animal
Or simply said, can we create bicycle for animal?
I just think that, Human walk is low efficient compare to bicycle...
Hi all, hope to get the help I need here. I have basic calculus and physics knowledge. I'd like to study Physics starting with a basic Freshman level book like Resnick (Physics) and Apostol (Calculus) and end up to be able to fully comprehend modern physics (Quantum, Relativity, Field...
Greetings.
I'm a 22 year old economics student on my final year.
I'm a small business owner. (something about the job market in my country Indonesia).
so you could imagine I don't have much time on the day, both for now or foreseeable future.
thing is, I've always been amazed by nature...
I am an electrical engineering student. My university is not that great and the EE program is not that great either, I don't even like the subject. . I just took the best opportunity I got in my country.. Anyways, I wish to pursue higher studies abroad after graduation and I will definitely...
Hi there,
I found this site while looking for the "best" textbooks in various disciplines. I am majoring in biochemistry, but I rarely buy textbooks. I usually download (torrent) them because I am unsure of their quality and reputation, and I am also usually quite broke. However, I do want...
I'm trying to understand the concept of "self-trapped" and "charge-transfer" excitons, and I'm hoping someone can break these concepts down for me. I've studied Wannier and Frenkel excitons a bit.
I'm reasonably unfamiliar with the concept of "self-trapping". I only know that it involves...
I am currently trying to self teach myself Algebra II and after I learn that I would like to move on to Trigonometry and so on. I was wondering what are the best methods to try to learn math by yourself. Is there any book or something on the internet to help me with this endeavor. Any answer...
Hello,
I am a self-learner. I am teaching myself calculus through different sources on the net, but I feel I book is handy.
Can you please suggest me a book on differential & integral calculus which:
(a) I can self-learn
(b) Has a lot of examples
(c) Clears out the concepts through...
In October of this year i will start with math major and i decided to prepare myself in spear time. In my faculty there is no such thing as Calculus but rather you go strait to the analysis and you pick up calculus along. (There is singe variable calculus in high school). In first two years...
I understand it has something to do with the index of refraction being directly related to the intensity of radiation, but on a more fundamental level, why?
Hi everyone! I am a high school junior in New York, now finishing AP Physics C, Calculus BC and multivariable calculus (introductory). I want to pursuit a physics/math career in the future, planning to be a researcher. I have quite a lot of free time so I want to utlize them by self learning...
I have been studying physics and math on my own for ever a year now, and I am not sure about when I am ready to move on to something higher. How do you know when you 'get' something?
Is it when you can look at all of the problems and figure out instantly how to do them just intuitively...
Are there any articles on solutions for simple self consistent systems in EM, as in when the field equations are coupled with the motion of the particles, I would like to explicitly see the energy conservation in those systems.
I am a beginner to QFT and I try to plot the Feynman diagram for the photon self-energy. Following Mandl-Shaw book (page 109 Eq. 7.22)
\int d^4x_1 d^4x_2 (-1)\mathrm{Tr}(iS_F(x_2-x_1)\gamma A^-(x_1) iS_F(x_1-x_2) \gamma A^+(x_2))
but when I try to convert it to momentum space I get
\int...
I'm an M.E. and I want to learn about electronics to the point where I can design and build circuits that do what I want. Right now I have only a very basic background from undergrad EE courses, I know a bit about opamps and transistors and diodes and transformers and the E&M physics theory and...
Homework Statement
(see attachment)
Homework Equations
The Attempt at a Solution
The self capacitance of an isolated sphere is ##4\pi \epsilon_o R## where R is the radius of sphere but I am not sure how to begin on this one.
Any help is appreciated. Thanks!
Hello,
I am using a lock-in amplifier to measure the AC voltage across a small sample of superconducting wire located in a cryostat.
As the self-inductance and the capacitance of the wires used for the measurement are non-negligible, I have basically connected the lock-in amplifier in series...
I have been out of school for over a year now. The reason for this is that I was bored with the classes I was taking at the community college (calc 2, physics 2 and physics 3) to the point that I could not concentrate on earning A's, among other issues, not quite sure why given that I had...
Hello friends.
It seems to me that i have reach a wall with my math education. In 3.5 months i will be doing tests for mathematics faculty(college), something like SAT but a bit more difficult i think.
Anyway i have been doing more difficult problems from problem set and i simply can't figure...
After participating in so many discussions about QM and GR... I've got strange hobby.
Well, the first experiment. The actress is overplaying, I know, but she is not an actress at all.
https://www.youtube.com/watch?v=sHiMZQwJU9Y
Girl is transforming into a vampire and then burns...
hi
i am now learning the topic "Reproduction in flowering plants" and i encounter something i don't understand
It is said that there are two disadvantages for self pollination
1. the offspring are genetically identical to their parents so becoming less adaptable to the environment...
I am having trouble thinking about self induction in the primary coil... My text says in standard situation the self induction voltage is same as the primary voltage... My question is how does current flow in the primary coil then? Please tell me where I am getting this wrong?
I'm going into a career that is heavily based in physics and I'd like to be able to read the original source material for the physics involved. However, calculus was many, many years ago for me.
So, to understand and learn radiation physics, and eventually quantum mechanics, my understanding...
Hi,
Ive been doing some reading into 1 dimensional plasma numerical simulations and they keep referring to solving for a "self-consistent" field. If the simulation is in one dimension with periodic boundary conditions, how would I go about solving this electric field?
Example:
dE/dx =...
can we have a system in which the machine is able to diagnosis the fault yet to come in minutes and suggest as well as assist the user to rectify it in while the machine is working. for example in an engine when the dirt sticks in jet of carburetor then a pressurized air is used to remove it or...
Homework Statement
I have to solve for RD, RS1, and RS2.
Homework Equations
AVNL=-mg(Rd//rd)
Vdd-Id(Rd+RStotal)=0
Bias Line Eq: Vg-Vgsq-Idq(RStotal)
The Attempt at a Solution
I have solved for RD by using the AVNL equation and the given value of -8 for AVNL.
I found RD to be...
Okay, first of all I am hoping I have posted this in the correct place.
So the background is the following, I currently have an engineering degree but wish to actually expand my knowledge more in the physics side of things.I just would like to know a level of physics up to undergrad standard...
Hey, I haven't been here for awhile but I would like to know if anyone has some good links or free pdf books, to help me learn and excel in quantum physics and calc. I so far have not taken any calculus and it will most likely be completely foreign to me but, I understand that and since I'm...
I can't find sth about self interaction which tells for sure in what situations we should consider it and how to manipulate it!
Can we talk about self interaction for e.g. a single electric charge?Or it appears only in certain cases?How should we calculate it?
Thanks
Hey all,
I was reading Terence Tao's text on analysis. After stating the axioms of pairing and regularity, he asks for proof of the statement that no set can be an element of itself, using the above two axioms. He has not defined any concepts like hierarchy or ranks.
I can see how,
A...
Hello PF,
I'm going to be heading to my 3rd year as a Physics major and I want to make this last month of summer a tad productive. So my plan was to review/self study math using the mathematical methods book by Boas (and maybe some online resources to get more depth on some particular...
I can do calculus on a normal level from high school now but I would like to further myself. I was recommended Michael Spivak 4th Edition...Tom Apostol 1st and 2nd edition...Walter Rudin Mathematical Analysis 3rd Edition...Richard Courant 1 and 2 calculus/analysis introduction.
Hi everybody, I've been out of school for 4 years and I'd like to learn some physics.
I'll give a summary of my background and I'd like suggestions as to what I should study and in what order. There's an abundance of resources that can be found through Google, but it's hard to decide what is...
Hello Everyone!
I have a problem I am solving through a self study project from Lowell Brown's book entitled: Quantum Field Theory". It is a math question (basically) on recursion relations.
Homework Statement
The variational definition gives us the relation:
det[1-λK] = exp{tr...
I am a graduate student preparing for my comperhensive exam, and do not have a very strong background in QM. Which method should I use? which book takes me to the point of getting 60% out of exam. The material is advanced undergraduate QM.
Self Taught Abstract Mathematics Course??
Good evening everyone! I would like to know if anyone has any recommendations for a self-teaching course in abstract mathematics. I have attempted to teach myself abstract algebra and linear algebra but for some reason I cannot find the discipline to...
The equations used are:
1)ΣF=ma
2)fk = μkN
3)fs ≤ μsN
4)Fs = - kx
Here are the questions:
1. If ΣF is 10N and a=1 m/s^2, find m using the first equation
2. Given ΣF = fk, m=250 kg, μk=0.2, and N = 10m, find a.
3. ΣF=T-10m, but a=0 m/s^2. Use the first equation to find m in terms of T...
No, you didn't read the title wrong. I am really self studying a physics class.
I just finished Mechanics (Physics I) and since I want to go to college to study physics to become an engineer or physicist. I need to take the next class, E&M (Physics II, Electricity and Magnetism). However, I...
Hi, I was working through a Twistor paper and it was explaining the link between holomorphic vector bundles and anti self dual gauges and it had an equation like this, for electro-magnetism.
\lambda^a \lambda^b(\frac{\partial A_{b\dot{b}}}{\partial x^{a\dot{a}}}-\frac{\partial...
Hi. I am a physics major and Id probably go with mathematical/theoretical physics path.
Where do I start with self learning linear algebra? I'm good with proofs but I'm not comfortable with learning math without intuition or motivation behind the axioms. Still, I hate math without rigor...
The diaphragm in a dynamic microphone moves a wire coil in the presence of a magnet to induce a current related to the movement. Other types of microphones, like electret and condenser microphones have self noise - noise not attributable to the amplifier. I wonder if all of the "self noise"...
Hello everyone,
I'm brand new here as a poster. I have been working to teach myself calculus to a solid level before taking classes in calulcus. I want to make sure I have a good foundation before I get "thrown to the wolves" so to speak. I've always been a little scared of math so I want to...
So I know transformers work by mutual inductance. A first loop that is connected to AC current produces an alternating B which produces a changing flux. As a result an induced Emf is formed. This Alternating B is also alternating in the second coil as well to produce same emf (if same number of...
I have a qualitative question to ask:
The Schwarzschild radius of matter is proportional to its mass.
The actual radius of the matter, assuming it is spherical, is proportional to the cube root of its mass.
This implies that the density required to form a Schwarzschild radius decreases as...
Hi all. A friend and I were discussing whether or not it was possible to construct a mechanism of weights and pulleys etc. or other methods to keep a seesaw level regardless of where the weight was placed on the platform. The end result would be the ability to step onto one side of a level...
Homework Statement
For one of the problems in my homework it asks to prove that L=μAN^2/length ...i didnt have a problem with that osrt but the second part states a spring is 5cm long and has a diameter of .15 cm with 50 coils...how much self-inductance must you include for it to model as an...
Hi, I'm new to the forums.
I hear this is a helpful site with knowledgeable people who know what they're talking about.
I was wondering if you could answer a couple of questions for me.
I am in high-school and soon attending college in a year, I plan on going into Medicine but I want to be...
In Feynman lectures vol 2, chap 28, it is given that for an electron at rest, the net self force exerted on itself is zero(due to repulsions etc.). But when accelerated, owing to the retardation of the electromagnetic fields, there would be a net self force. A series expansion(with unknown...