Structure Definition and 1000 Threads

Suppose we have an energized conductor say 10m above the ground, my understanding is that E Field at the ground will be 0 v/m. My question is, if we have say 8m tall steel tower approximately 3m from the energized conductor and grounded. What is the electrical field on this grounded steel...

Hello. I have an object that I want to talk about. The object above does not seem to have numbers in a definite pattern, so, I think that this object will not have a single equation that describes the object, but instead there will be multiple number of equations of 'y' in 'x'. Correct?

In quantum mechanics time evolution is defined via a unitary operator $$U(t^\prime,t) = e^{-iH(t^\prime-t)}$$ Now let's forget about the fact that we know this exponential representation and that we know that the U's fulfill the group axioms, i.e. that we can multiply any two U's, regardless...

Homework Statement Hi everybody! Here is the problem: Hyperfine splitting of Deuterium Balmer alpha line: Consider the ##3p_{3/2}## to ##2s_{1/2}## transition in deuterium. Find the number of transition lines and their frequency shifts with respect to the transition without hyperfine...

I am reading "Abstract Algebra: Structures and Applications" by Stephen Lovett ... I am currently focused on Chapter 8: Galois Theory, Section 1: Automorphisms of Field Extensions ... ... I need help with Example 11.1.10 on page 560 ... ...Example 11.1.10 reads as follows: My questions...

I am reading "Abstract Algebra: Structures and Applications" by Stephen Lovett ... I am currently focused on Chapter 8: Galois Theory, Section 1: Automorphisms of Field Extensions ... ... I need help with Example 11.1.10 on page 560 ... ...Example 11.1.10 reads as follows: My questions...

Hey all! Undergrad in M.Eng here, building a desktop robotic arm (<12 inches tall, arduino board) for a personal project. I've been looking at materials, and aluminum and wood are both doable, but if possible I'd rather use a lighter material that I can cut without machines, such as a strong...

Homework Statement The problem is, calculate the energy and displacement of the structure. What is the displacement (y) in the middle of the beam? See drawing and variables in attached PDF file. Homework Equations See PDF file. Important: To form the moment function M(x), I use delta...

Hello everybody, I am currently working on desinging a tool, and I would like to get your advice on how to increase it's stiffness. The tool will be used for correct positioning of a component. It consists of 2 parts : And

Forgive my ignorance, I am learning about topics like the geoid, geoid anomalies, gravity anomalies as it relates to lithospheric composition. In my studies, I repeatedly find talk of show wavelengths and long wavelengths having different effects on crustal composition. One example I can give...

I tried to treat FCC lattice with a lattice constant a, as a monoatomic lattice. The reciprocal lattice is a BCC with a lattice constant 2pi/a. And the structure factor is 1. But I can treat FCC lattice with a lattice constant a, as a simple cubic lattice, with 4 atoms in each unit cell. As one...

For the crystal lattices and structure Question picture is uploaded. Question.jpg My attempted answer is uploaded by a picture. My attempted ans. 1.jpg My attempted ans. 2.jpgThere is any mistake?

Hi everyone, I am just wondering how to calculate electron distribution using tight binding band structure for a system like graphene or any other solid. So the goal is to get |\psi(r)|^2 which \psi is the band state and it is the linear combination of Bloch sum...

Homework Statement http://i.imgur.com/Jt3u2uo.png Homework Equations octet structure bond strength bond order The Attempt at a Solution I have no idea why the answer is b... after reading the book... thank you.

Hi everyone, I am new here... please forgive me if my posting is imperfect :p I am planning to purchase a glass aquarium with tank dimensions: 48" (Length) * 24" (Depth) * 22" (Height) I wonder if a wooden stand with only edge support will be able to withstand the weight of the filled...

Consider an expression of the following form: $$I^{\mu\nu}(r) = \int d^{3}k\ \ d^{3}l\ \ \delta^{4}(r-k-l)\ (g^{\mu\nu}k\cdot{l}+k^{\nu}k^{\mu}-k^{\mu}l^{\nu})$$ ##I^{\mu\nu}## must be of the form $$I^{\mu\nu}(r) = Ar^{\mu}r^{\nu} + B\eta^{\mu\nu},$$ where ##A## and ##B## are constants. How...

I am wondering if anyone has determined by experiment or calculation at what rate or even better what frequency the quarks move around at inside a neutron and proton? Do neutrons or protons vibrate at a specific frequency.

Homework Statement Consider the binary structure given by multiplication mod 20 on {4, 8, 12, 16}. Is this a group? If not, why not? Homework EquationsThe Attempt at a Solution I started by constructing a Cayley table, and working things out. It turns out that 16 acts as an identity element, 4...

According to Snustard and Simmons the structure of DNA polymerase III is the following, where the clamp loader( γ -δ complex ) is present on one side: But according to Lehninger the clamp loader is centrally located: Which one is right? Besides where can I find a correct diagrammatic...

Hi, For school, I have to give the Lewis structure of C3H5+ ion. There is a method explained, which is fairly easy, and has always worked. It has also worked for ions. However, this is the first time I have to give the Lewis structure of a positive ion.The valence of the C atom is 4 electrons...

I created interpolative curvefits to the graph of Earth's density as a function of radius, shown here: (Image from Wikipedia) Earth is assumed to be a sphere of radius 6371 kilometers. The independent variable r is the geocentric distance as a fraction of the Earth's radius; i.e. the range of...

Homework Statement In the example A , Why the author stated the total reactions = 9 only ? How to determine the total reactions for this type of questions ? Homework EquationsThe Attempt at a Solution we can see that there is a total of 3 reactions (vertical , horizontal and moment) at the...

From Frank Wilczek's book 'A Beautiful Question' 'Quantum mechanics shows how the poverty of energy imposes structure' P196 Is he saying the poverty of energy imposes structure in the energy of a quantum system or structure in matter? Or both? If we look at an atom it has ordered structure in...

Here is my question and please tell what is wrong in this? So let's think that we have rail and we move Somekind batteries in this rail and we have also solar elements to get energy to power this rail system and a lamp to throw out enregy from this thing that we move. And what we move is...

I would like to find the crystal structure of (Pb0.5Sn0.5)Te I was told it is similar to NaCl basically an XY crystal I think it is called Space Group: 225 I would like to know the first, second, third ...layer of atoms closest to a X atom...and perhaps their distance... I found...

This is schematic band structure for the dxz and dyz orbitals using a 2D square Fe lattice. What is the location in the Brillouin zone of the hole-like Fermi surface and the electron-like Fermi surface?

Hey there! I got two pictures of PCF's cross sections. Can anybody tell me if these PCF are the same? I mean, why there is an outer ring of smaller air holes in the pic 2, what does that ring represents? (core, cladding)

Homework Statement In electron proton scattering, ##\int_0^{1} F^p_2(x)dx = 0.18## For the neutron in electron deuteron scattering, ##\int_0^1F^n_2(x)dx = 0.12## Therefore determine the ratio ##\frac{\int_0^1xu^p_v(x)dx}{\int_0^1xd^p_v(x)dx}##. Homework EquationsThe Attempt at a Solution...

Hello everyone! I am not actually posting this discussion regarding a homework problem. But I wanted to get some ideas from you all about how to approach the analysis of a structure I am looking at for a Statics Project. The structure is very complex, and my project partner and I are trying...

I was wondering how they managed to know the internal structure of Earth and it's composition while there is lava and it's very hot such that no any instruments can get there...seriously I am confused

Homework Statement I've been given the worked answer to a very similar question, but there's a step I don't understand so I can't apply it. My question asks: An energy level with ##J=\frac{11}{2}## has six hyperfine sub-levels with these relative energies...

As an electronic engineer I am not an expert on semiconductor physics but I think I understand the basics of energy band diagrams reasonably well. It all fits together fairly neatly with the normal textbook assumption that we are looking at pure N-type or P-type doping. The problem I have is...

Homework Statement Why can't we have 4s^2 3S1 calcium? I've looked up a table of terms and this is never given, so I guess we can't have it. Why can't the spins of each of the outer electrons add to give S = 1, J = 1, and a degeneracy of 3? I guess the answer must be pretty basic since nobody...

Let's say you have a good personal computer with these characteristics: i7-6700K, 32GB RAM, 256GB SSD, 2 x GTX 970 4GB And let's assume you can run your algorithms, software... for 24 hours. I wonder, if I would be calculating the orbital structure of an hydrogen atom with many electrons...

hi, I got inspiration from alien, Prometheus, and knight of Sidonia(Japanimation) in these SIFI contents, I ve seen artificial things that stand quite long time. when it comes to man made structure, material, or method, I wonder is there any chance to survive million year on earth? structure...

1. A substrate molecule may be bound to the active site of an enzyme by all of the following EXCEPT A. Hydrogen Bonds B. Peptide Bonds C. Ionic Bonds D. Van der Waals Interactions E. Hydrophobic Interactions 2. Which of the following components is the most important in determining the 3-D...

I have a question to anyone experienced with graphs and topology. The question is relevant for this topic: https://www.physicsforums.com/threads/a-graph-based-model-of-physics-without-dimensions.887694/ Is it possible to construct an arbitrarily large graph (a set of vertices, a set of edges)...

So I keep getting this problem wrong and I don't know what's wrong. The structure I came up with is attached. If anyone can help I'd really appreciate it!

Hello, I have to calculate the cut-off energy of Beryllium that have hcp structure with the paramters: a=2.29Å and c=3.58Å. WHAT I HAVE DONE SO FAR: Using plane (100) or (010) Since the formula is: $$E=\frac{1}{2} \times G^2$$ $$G=\frac{2 \Pi}{2d} $$ $$\frac{1}{d^2} = \frac{4}{3} \times...

I have question about the proof of Cartan's structure equation in the context of pincipal bundle in Nakahara's book. The attached image is taken from the book. To show that the curvature two-form ##\Omega ## satisfies ##\Omega (X,Y) = {d_P}\omega (X,Y) + [\omega (X),\omega (Y)]## The author...

i think it should have double bond with o

I am looking for any references about 2-dimensional lattice structures (ie hexagonal like graphine) that have the highest shear strength (or just resistance to distortion in the 2D plane). Does anybody have any good references for this?

How fluids would act around the circumference of a space centrifugal, where the habitable zones are. Given that we have a radial gradient of Artificial Gravity , plus Coriolis, inertia, frictions etc. Id expect some change. Will add a list of questions but this more like an open discussion...

In C++ we have 2 types of data structures :- 1)simple data structure so array and structure come in simple data structure group 2)compound data structure so stack,queue,link list,tree come in compound data structure group. In Indian board CBSE data structure linked list is not included it is...

Homework Statement http://holland.pk/uptow/i4/4af070d190cc175e6ca5d326cd60cda2.png The attempt at a solution the question have a possible solution? that equation is based on stress is constant, so how to use this equation to proof? i m a year 2 student. i can only solve part i...

Hi, I need to figure out how much weight a 5 foot steel pipe will support before becoming unsafe. I am building a series of out door pull up bars for my neighborhood as an eagle project. I need to buy the right pipe/tube that will be sturdy enough but not have too big of a diameter that you...

Hey guys, I need your help. I have to write a homework and we are actually looking at structure functions (Kolmogorov 41 and so on), but I have no clue what it does. So I have formulas, but I do not understand what a structure function is. Is it something in the "real world" or is it just a way...

Hello everyone, i m working on a full circle space centrifuge concept. I try to support it with some maths but i don't want to dive into crazy details. I used alrdy lot of countermeasures to dangerous effects.I have problems similar to bridge mechanics. The design is not solid so i need to be...

I am trying to make a connection between the two in terms of the electron configuration for an atom relative to the octet rule for Lewis Dot diagrams. Maybe I just don't understand what the electron configuration represents. Why is it that Lewis Dot diagrams utilize 8 valence electrons as a full...

What are some properties of materials that are related to the fact that the crystal structure of said material is the hexagonal close-packed structure?