Self Definition and 561 Threads

I hope this is posted in the correct thread. When I was still in my physics class, we learned that a loop of wire with current can act as a self inductor. Just to refresh my memory: A loop of wire carrying current has a magnetic field around it due to current, however if the current changes...

A Thousand Kilobots Self-Assemble Into Complex Shapes http://spectrum.ieee.org/automaton/robotics/robotics-hardware/a-thousand-kilobots-self-assemble https://www.youtube.com/watch?v=G1t4M2XnIhI

In a DC circuit(Yes, keep going), when current starts to flow, and that current needs a bit of time to stabilize to its maximum value. Since there is change in current(increase) there is an increasing magnetic field, a changing flux... that will induce a -V to the circuit. Eventually when...

Homework Statement My source textbook is the community college / junior college (confer: undergraduate-lower division) probability and statistics textbook: An Introduction to Mathematical Statistics and Its Applications, 2nd Edition Authors: Richard J. Larsen, Morris L. Marx 1986...

Homework Statement The Binomial Distribution - already developed by Jacob Bernoulli (in 1713), et alii, before Abraham de Moivre (1667-1754 CE), et alii, developed the Normal Distribution as an approximation for it (id est, the Binomial Distribution) - gives the discrete probability...

Hi, I'm a 19 year old boy who's never been in a maths or physics high school class for a number of reasons. I learned to swim by myself when I was 7, after failing to attend courses because I would panic every time. So I saw no reason I could not learn my country's high school math, then...

I'm trying to design or find a design for a steam turbine that recycles it's water, or at least a large percentage of it, to prevent refilling of a boiler tank. My thoughts; The turbine will be powered by steam heated through copper tubing which is fed from a large unheated, (or partially...

Any good textbooks on differential geometry for self study? I'm not the best at reading comprehension. I've already studied Calculus, differential equations, and linear algebra.

would time dilation occur if for example, i was making a hydrogen atom spin with the center of spin the atom? would time dilation occur? because it didn't really traveled distance... or, if so spin a muon, would it decay faster if i was to spin it in an incredible amount of speed? but then if...

So I made another post to explain my position, and I need to learn Algebra 2B this summer (The B part or second half) In order to test out of it next school year and then take trig. So I was wondering if anyone knew a good source to self teach algebra 2B, maybe an online course, or a website...

Hello. I am an MD but Physics excites me. Interested in Physics, I want to self study the subject from the beginning so that I can come to grips with the subject. I have a sound mathematical background and I know I can study myself but help regarding books would be appreciated. So please anyone...

Hello Physics forums, I have previously very long ago made an account on this forum after having visited it so much, but i never really posted anything. Now, I come back after witnessing the physics forums app on the apple appstore. I love to just scroll around the physics section and see what...

For arbitrary Fermionic self energy, \Sigma(i wn) with wn=(2n+1)pi T, its real part is always an even function of wn while its imaginary part is always an odd function of wn.

Homework Statement Hi again guys, been stuck on this problem for a while now, thought it would be a simple bumping in some values in a given equation question but I can't get the correct answer :confused: Heres the problem: What is the inductance of a 600 turn coil wound on a core of cross...

Any idea how to approach finding the self energy of an infinitely long, thin insulating cylinder. It's got linear charge density so I can probably express the self energy as energy/length. I just don't know how to approach it.

Homework Statement I'm given a graph and am told to find non-trivial self isomorphisms. Non-trivial meaning that at least 1 node is "not mapped onto itself." I've tried looking for self isomorphism but I can't find anything. I can tell when two graphs are isomorphic through inspection but...

I was planning on using Richard Feynman's lectures on physics to study for high school ap tests on mechanics and electromagnetism. I don't know how in depth Feynman's lectures go, since there are no problems but I've heard it works when you're trying to grasp the material. However, I don't know...

Math Topics to Self Study Any recommendations for a 9th grader? I have taken algebra 1 and 2 and am currently taking geometry. I find that math class is sometimes very slow. I understand that some students need extra help, but for me it's a bit slow. So to take initiative, I want to learn...

In this post i want to discuss good chemistry textbooks vs. bad chemistry textbooks and I'd like some help finding a good General chemistry textbook for university - Undergraduate level. What Is a good introductory chemistry textbook? So i finally found a book in organic chemistry which...

contradictory set of abelian groups.

I read that every particle in the universe has an antimatter form of itself. Does that mean there exists an antimatter form of ourself? If so, where is this antimatter form of ourself? This question might be stupid, but I'm just curioous.

Mechanics -- factored self weight of an object How would you find the factored self weight of an object, suppose you are given the the dimensions and mass per metre of the object. Would you find the unit weight first by multiply by 9.81 and then multiplying the volume to find the UDL?

In the case of self induction, when the intensity increases gradually an emf is induced which generates a back current " equal in magnitude, opposite in direction " to oppose the increase, so if that is right shouldn't the intensity in the coil Become ZERO till the intensity becomes steady?

Hi everyone, :) Here is a question I encountered recently. Question: Let \(V\) be a unitary space. Give the definitions of a self adjoint and unitary linear transformations of \(V\). Prove that \(f_1 g_1=f_2 g_2\), where \(f_1,\,f_2\) are self adjoint positive and \(g_1,\,g_2\) unitary...

Self inductance of a coil : how does it happen ? I've got some hardtime trying to imagine how it happens , the phrase which confused the most while studying was "each turn acts as a small magnet ",so why does it change polarities at the moment of switching the circuit on or off ? Also the whole...

Conisider the space $L_{2}$ of square integrable functions on R with the usual integral inner product. Show that the operator E defined by, for f in $L_{2}$, $(Ef)(x)=0.5(f(x)+f(-x)$ is self adoint. It seems that in order for this to be true we have that f(-x) is the conjugate of f(x) but I...

Can someone explain the concept to me? As far as I know, in some energy interval there are materials which have resonance absorption. The book then goes on to say that energy self shielding does something to combat this absorption but I am not clear on how and hope someone can clear this up for me.

I have been given the exercise above which relates to an article we are reading. I can calculate all the results but I can't interpret them physically. I think my major problem is that I don't see how self capacitance is a physically measureable quantity. For a recap the self capacitance is...

I am a mechanical engineer with 2 1/2years working experience. I have a Bachelor degree in Science (Mechanical Engineering). Physics is one of my favorite subject when I was in high school. Even though I already graduated from University, during my free time, I will self study Physics. I have an...

First of all, I understand that an EM wave is created by a charged particle that is moving. What I don't understand is how it propagates itself when traveling through a vacuum as there is no medium for it to interact with. Can this be explained by anything other than photon theory? I really...

Hello It has come to my attention that the AP Physics B test is being replaced with AP Physics 1 and 2 for the 2014/15 school year. I'm currently a junior in high school enrolled in a CP Physics course, and I had planned to take AP Physics B in my senior year. However, with these changes, I...

The well-known connection between the electric field and Coulomb's law is that The magnitude of the electic field at distance r from a point-charge Q is E=Q/r^2The definition of E is that the force exerted the field on a point-charge q is F=qE. These two equalities yield the F=qQ/r^2...

Consider a solid cylinder of radius R. an varying current of current density δ flows through. what would be self inductance of that cylinder

I majored in physics in college and have a master's degree from Michigan State Univ. in physics. I just recently retired and have the urge to revisit some of my old studies. In the last year I've refreshed the intellectual side of myself by working thru a calculus book and book on differential...

I have a BS in MechE, and work in R&D. I've been plugging away at my MS in MechE, about halfway through, and have been considering that a PhD may really be more intellectually and personally what I want. I've spoken to some old professors and friends with doctorates. I don't think I'm ready...

Hello, I am self studying to take the Ap Physics C test. I already know algebra based mechanics, although i DO NOT know calculus based. I have no knowledge on electricity. What textbook should i use?

It is known that a charged particle moving with some acceleration emits electromagnetic waves. For example, this may be a particle moving at a constant speed on the circle. In this case the radiation of a particle is called the braking radiation, the cyclotron radiation, or the synchrotron...

Please move this if it's not the appropriate section of the forum. Could anyone point me towards some good supplements for self studying geometry? I just finished trigonometry, and I'm starting calculus, and algebra/trig based physics in a few weeks once fall courses start. However, I've...

With the internet as large and powerful as ever, YouTube videos with lectures and tutorials, what kind of fool would pay thousands of dollars to go to school and get a piece of paper that says their qualified when they can do it all in their own time for free? Goodbye tradition...

What is the total mechanical energy (self energy) of the universe that is due to the fact that it expands, taken the big bang as the origin - on the basis of general relativity? If anyone could supply me with the equation and number (what size is it in kgm2/s2) I would be very thankful.

Hi all, new on here so thanks in advance for your responce's I am an avid cyclist and competant engineer, i dislike oil and gas so much i do not own a car. I cycle everywhere. I am tired of wanting to go long distances without assistance or a high top speed. I want to build a cycle with...

Hey everyone, I want to see if anyone can give me their perspectives on my academic interests and situation. I know up front that this comes down to personal preference, but I want to see if anyone had any thoughts that might push me one way or another. I am a physician who is somewhat...

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...

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...