Self Definition and 584 Threads

Does a circle have a constant rate of change of it self that defines it as a circle. I have never heard of such a thing but I am curious. It must right?? Since every circle is the same no matter the radius(the arch will change by some constant amount per radian) If that doesn't make...

Hello, I was hoping that someone might be able to provide a definition for the "resonance self shielding correction". -TP

I have two main questions: 1. What's next? I have taken several physics courses(covered both mechanics, E/M, wave motion, fluid dynamics, and special relativity) in my high school career. I want to know what i can learn next? (preferably not quantum) The reason I ask is because I love...

So this fall is going to be my first full semester as an EE major. Here's my classes: Introduction to Circuits and Electronics This course introduces linear circuit analysis and design including extensive use of op amps. Presents DC networks, including node and mesh analysis with...

Self Propelled Golf "Pull" Cart Hello everyone. I am quite the novice when it comes to stuff like this but I was wondering if anyone would be able to help me with a project I would like to undertake. My idea is to build a golf “pull” cart with some sort of DC motor that might run off a battery...

I'm an engineer student, and I think I need a refresher on everything from algebra to calculus. Would definitely appreciate it if some of you can provide recommendations for some math self study software.

Do you have any stories of people successfully self-studying a relatively advanced subjected in which they've had absolutely no coursework? Personally, I've taken some honors level courses in high school and then done some extra studying to get on a good enough level to take the AP test. I've...

I'm sure there are many like myself who are self studiers: read the book, do the problems. Right now I'm working through Halliday, Resnick and Walker, Fundamentals of Physics, and doing all the odd problems because the answers are in the back of the book. I'm also watching the MIT OCW lectures...

Hi all, I am trying to find numerically the eigenvalues of a nonlinear schroedinger equation in a similar way as the Self Consistent Field method for Hatree-Fock problems. Does anybody know in the SCF calculation how to improve the convergency? Is there any trick other than simply inserting...

Hello everyone! Alright, my current high school math class is IB Higher Level Mathematics. It's a two year long course. During the first year we have focused primarily on Advanced Algebra, Trigonometry, and we are about to start Vectors. Year 2 consists of Calculus I, Statistics, and then...

Hi, I have been calculating the 3 infinities in QED as part of my project (vacuum polarisation, vertex corrections and electron self energy). Mostly I have been following the description in Mandl and Shaw for determining the first two (chapter 10, sections starting on p211). However it does...

Hi, I am grade 11 in high school I got my grade 11 math and physics credit and i thought i want to move on and study grade 12 and more (maybe even university level) I always loved math and last semester I tried physics for first time and it was awesome (except optics,, hahaha personal...

I'm thinking of teaching myself some topics in maths and physics for fun over the summer. However, I've found that I usually need a teacher/lecturer to explain some concepts to me when the books go all sketchy in those areas. I need this especially when I can't see where I've gone wrong in my...

Homework Statement calc the self inductance of a hairpin...to get a definite answer assume the wire has a tiny radius of e Homework Equations L=\phi/I The Attempt at a Solution So i found the b field \muI/2\pis than for the flux, I got \muI/2\pi\int1/s Lds In the book, they got...

I am taking calculus b but for some reason it seems to be a shorter version according to my instructor. We are using james stewart 6th edition but only taking chapters from 7-11 excluding 10 which are 7_Inverse Functions: Exponential, Logarithmic, and Inverse Trigonometric Functions...

Hi all! I am a current senior in high school, and will be finishing BC by the end of this month. I do not yet know where I am going to college, but I am planning on trying to place out of a few math classes before arriving. II will most likely major in engineering, but I still am interested...

Homework Statement Calculate the self inductance of a solenoid that is tightly wound with a wire of diameter .1 cm , has a cross sectional area of .9 cm2 and is 40 cm long? Homework Equations The Attempt at a Solution the formula L=u0n2V where V=volume and n=number of turns...

Advice on a "great" self study book. PDE Hello, for the first time this summer i won't be taking ( at least i hope so) any classes. That will give me a lot of free time to do as i please. i will be a senior in college and i still have to take pde's. The prof that teaches the course, at least...

No one in philosophy or cognitive neuroscience has come to a general consensus about the “self”. Questions about the “self” and “consciousness” have been pestering me awhile. I believe I need more knowledge before I can truly adopt a position; hence the purpose of this message being the...

Hi, I was wondering if anyone could recommend a good solid book(s) for self study of electronics design? I emphasize design because I recently finished an electronics course in college and have found that I am decent at solving book problems but horrible at designing circuits. I still have no...

Homework Statement Let V be a real inner product space of dimension n and let Q be a linear transformation from V to V . Suppose that Q is non-singular and self-adjoint. Show that Q−1 is self-adjoint. Suppose, furthermore, that Q is positive-definite (that is, <Qv,v> > 0 for all non-zero...

By all techinical standards, I am not required to take Differential Equations. I am currently a Physics major with a 2nd major in Mathematics Education. I want to take DE before I start any of my upper level Physics courses next fall since 2 of my academic advisors (one for Physics, one for...

so At my current school they do not offer ap physics, and i need to take ap physics b to get into university! Does anyone know who has taken the exam if it is possible to teach ap physics to yourself in 5 months?

hi, i am concerned that my lack of self esteem may be making it hard for me to meet someone, any advice? thanks!

Dear Physics gurus- I have a question which I believe will be rather simple for one of your to help explain to me. Not coming from much of a scientific background, I’m looking for a conclusive technical explanation of the following question which I debated at some great length with my...

Hello, I'm a new member from the north east of England. I'll use my lunchbreak to say a bit about myself. I'm married with three kids, one dog, two cats, two gerbils, a gecko and a corn snake. I work in local government I.T., educated to degree level (Computer Science), layperson interested in...

\hat{H}=\hat{H}_0+S\sum_{i,j}I_{i,j}(\hat{a}_i\hat{b}_j+\hat{a}_i^+\hat{b}_j^++\hat{b} ^+_j\hat{b}_j+\hat{a} ^+_i\hat{a}_i)-\sum_{i,j}I_{i,j}[\frac{1}{2}(\hat{a}_i\hat{b} ^+_j\hat{b}_j\hat{b}_j+\hat{a}^+_i\hat{a}^+_i\hat{a}_i\hat{b} ^+_j)+\hat{a} ^+_i\hat{a}_i\hat{b} ^+_j\hat{b}_j]...

Hi together ... I encountered the following statement: Operator A is self adjoint on D(A) then A(t) \equiv \exp(iHt) A \exp(-iHt) is self adjoint on D(A(t)) \equiv \exp(-iHt) D(A). H is self adjoint, so that exp(...) is a unitary transformation. But why does the domain transform this way...

Is there a model for determining the self resonant frequency of a flat spiral inductor? I can determine the inductance but the capacitance is escaping me. Thanks for any help.

Homework Statement "In class we calculated the electrostatic self energy of a uniform density sphere of charge, i.e., the work required to assemble the sphere from "infinite dispersal." Along the same lines, calculate the electrostatic self energy of a spherical shell of charge, of negligible...

Homework Statement I am given that an operator is defined by the following: \hat\pi\psi(x,y)=\psi(y,x) in a 2 variable Hilbert space of functions \psi(x,y) I have to show that the operator is linear and Hermitian Homework Equations An operator is self adjoint if...

I was wondering if there's some kind of curriculum I could follow to self-learn undergraduate physics and math. I'm a senior in high school, I took Pre-AP physics last year and am taking AP Physics this year. I also took a computer science class and am taking another one this year. I...

Both Wikipedia and my educators called electromagnetic radiation a self propagating wave. I would suggest that the word self be removed from wikipedia at least. There is no self in a wave. Even the word "coupled" or "causally related" are risky WRT the grav and mag components as I don't...

Can Someone learn all mathematics required for undergraduate physics from only one textbook (mathematical methods in physics texts ) prior to knowing anything in physics especially if he want to self study ? What are the advantages and disadvantages of this method? If I have superficial...

Hi, I want to review a turbocharger gas turbine design project. The previous problem was, the gas turbine could not sustain itself. Help me out if you can figure out what could be wrong.

Direct current I in a straight wire is decreasing with time. Let's assume dI/dt is large. Will such change produce self-induced current in the direction of I? If Lenz's law is an equivalent of Newton's 3rd law, how come changes in straight wire meet no resistance?

Hi everyone, i am new here. I have been doing some research on a self propelling electromagnetic generator. I am a bit confused on why they don't work and was hoping to have some input on some of my ideas. So the normal electromagnetic generator has a wheel with rare Earth magnets while...

I have really bad self control... basically I want to do things - things I know I should do, but I just can't make myself do them! this is causing a problem in my life! What can I do? How do you make yourself do things that you don't want to do but you know you should do? Any advice is welcome!

Let us consider the equation E=mc^2 in relation to a charged particle. The traditional deduction of this relation as we find in the introductory texts on Special Relativity do not take into account the huge amount of electrostatic field around it. If the particle annihilates not only the bare...

Hi, so I'm going to attend university this fall, and I'm planning to double major in math and physics. So I will be taking a calculus course based on Spivak and an Algebra course that uses Friendberg's Linear Algebra. So currently I'm trying to start studying these books so that I can get up...

Hello. I was wondering if I should self study multivariable calculus or introduction to proofs? I am an entering high school senior (contrary to what my username might suggest), and I just took a Calc 2 class last spring. I can only do one or the other, and I don't know which one would be...

As defined by wikipiedia: I believe all of these values are ingrained in our culture except that the cultural view of self-actualization is different then that of Maslow's Hierarchy of needs. All these ideals are problematic. For instance: 1)Personal responsibility presumes we are in...

Hi everybody, I'm writing my QFT exam tomorrow and I know that there will be a self energy calculation. Since I am not that familiar with it, because we didn't do any self energy calculations in the exercises so far, I would like to do some simple calculations. I think the electron self...

I've got a good background in physics and math. I'm interested in getting a decent foundation in chemistry/biology with an eye towards understanding nutrition (for starters). (I've been out of school for years.) From browsing course requirements, it seems like I'll need: organic chemistry...

Hey guys, I entered high school not interested in math or science, which ended up really biting me. I really want to learn some university-level physics and calc before I go off to college, but I don't have the perquisite courses. ( the physics and pre-calc classes I am taking next year...

There are a lot of calculus books I've heard around these forums, namely Spavik, Stewart, Apostol, and Thomas. Can any direct me to each books strengths towards self study? I don't mind one with a decent amount of theory, in fact, I welcome it.

self exciting dynamo question I was reading about dynamo's and there was one that the power it made was used to run the electromagnet that made the magnetic field that the induction coil spun in. This got me thinking if a generator can make enough electricity to power an electromagnet that is...

I am... a slacker who hasn't been living up to their full potential. I used to do very well, but then I just got lost in existential depression. I spend most of my time bored, searching for something entertaining to pass the time. It's usually internet forums or TV... but they're starting to...

I am an undergrad that will be a sophomore in the fall, and I've completed the first level class in calc-based classical mechanics, as well as Calc I and Calc II. The math presented to me was a typical plug-n-chug, cookbook, focus on techniques rather than concepts style. In short, I don't...

Ug physics self study alongwith engineering...please help...! I belong to india, and couldn't get a decent physics ug course for reasons i don't have time to explain. I have now ended up in an engineering course and plan to self study and take the gre after 4 years. And yeah, forgot to say, my...