Diagram Definition and 1000 Threads

I am reading the book: "An Introduction to Category Theory" by Harold Simmonds and am currently focused on Section 2.1: Diagram Chasing ... I need some help in order to fully understand Example 2.2.1 (b) on page 36 ... ... Example 2.1.2 reads as follows...

Why is it that in Grotrian diagram only the 4p->3s is not allowed, but the 4s->3p, 4p-> 3d and 4d-> 3p are allowed ? I'm following the rules of Δl=±1 and Δm=0,±1 and they give the same numbers. I also tried with Δj=0,±1 and still the same. Grotrian Diagram for Hydrogen for n=[1,4]...

When analyzing a Bode plot or its transfer function the technique of "inverted poles" is sometimes used. I first became aware of this at lecture decades ago by Dr. R. David Middlebrook. While the basic method of using inverted poles in the mathematics is somewhat straightforward I don't recall...

On EngineersEdge.com they have a free body diagram of a scissor lift https://www.engineersedge.com/mechanics_machines/scissor-lift.htm Can anyone explain how the Fy, Fx components are determined? What is specifically confusing to me is how Fy is opposite in direction given the system. To me...

First, is it suitable to solve a Green's function by one-order self-energy, since it only consider partial high order perturbation, so it's unclear that this calculation corresponding to which order perturbation. In other word, if one wants to use self-energy to get Green's function, he should...

Homework Statement Determine the forces acting on the two rods in the figure. Explain which stresses that act on the rods and the bolts holding the rods to the brackets in point A and C. Homework Equations ∑Fx = 0 ∑Fy = 0 ∑Fz = 0...

I'm trying to work out the Feynman diagrams for scalar-scalar scattering using the Yukawa interaction, as given in Chapter 6 of Lahiri & Pal's A First Book of Quantum Field Theory. The interaction hamiltonian is $$\mathscr{H}_{I}=h:\overline{\psi}\psi\phi:$$ where ##\psi## is a fermion field and...

Homework Statement a) Draw a diagram of energy levels to explain the spectrum of lines of the hydrogen atom b) Indicate, for each photon, that its region can be emitted to the electromagnetic spectrum. c) Compare, in a graph, the energies of the orbital of the hydrogen atom with the energies of...

Homework Statement Homework Equations Ideal gas law: $$PV=nRT$$ Workdone by the gas: For Isobaric process $$W=P(V_{2}-V_{1})$$ For Isothermal Process $$W=nRT \ln(V_{2}{/}V_{1})$$ First law: $$U=Q-W$$ The Attempt at a Solution subpart (a) is trivial, all we have to do is to substitute the...

Homework Statement Problem statement: https://www.docdroid.net/FwEvlgl/question4-problemstatement.pdf Provided solution: https://www.docdroid.net/1MkmPKT/question4-solution.pdf Homework Equations NOT Gate OR Gate Timing Diagram Delays The Attempt at a Solution The part for x is just "normal"...

Homework Statement Fig. 3-3 is a Moore type sequential circuit composed of a positive edge triggered D flip-flop and a combinational circuit. X is input, Y is an output, and CLK is a clock. Please show how Qo, Q1, and Y change when input X is given to this circuit at the timing diagram shown...

In lattice diagram, if the voltage wave is generated at Junction that there is an overhead transmission line before it, will the wave be in two directions with the same magnitude, or one in neglected ? Picture may illustrate .

Hey everybody, Its recurrent in Power System Analysis and Electrical Instalations the SL diagram. I need recommendations of books in which I can read about it. I've done a little research but couldn't find anything. Thats amusing, in which classes are this diagram teached for the first time...

Hello! Does anyone have an idea of how can I obtain information from a band diagram about the directions along which the system conducts best and worst ? Thank you in advanced! :)

Homework Statement Homework EquationsThe Attempt at a Solution Was wonder how the isotherm is negative? Is it because it is going counterclockwise (the arrows)? If this is the case, i don't see why a-c would be positive work... I'm just confused on whether work should be positive or...

Homework Statement Homework EquationsThe Attempt at a Solution These questions are kinda tricky for me even though i might get the right answer. I just want to know if my reasonings are correct. The answer i chose is C. For process DA, W = 0 , so delta U = Q. Q = 3/2nR(deltaT). Temp...

Homework Statement Homework EquationsThe Attempt at a Solution How come the pins at B and E don't affect the shear or moment diagram?

Homework Statement Homework Equations Energy band diagram equations. The Attempt at a Solution This is more of a conceptual question, but this is the problem I am working on for reference. What is the difference between a flat band diagram and an equilibrium diagram? I know what they will...

Hello,Ive got a question and wondering if there is someone that could help me? I would really appreciate it! I am studying for an exam that I am going to have in a couple of weeks and it has been going great besides that I have been stuck on a question about tension in a preloaded system with a...

A number of classicists were asked to identify their favorite epic poets. The results are summarized below. 62 appreciate Homer, 40 appreciate Virgil, 5 appreciate Gomer, 2 appreciate Homer and Virgil and Gomer, 3 appreciate Virgil and Gomer, 20 appreciate Homer and Virgil, 42 appreciate Homer...

There are a total of 103 foreign language students in a high school where they offer Spanish, French, and German. There are 29 students who take at least 2 languages at once. If there are 40 Spanish students, 42 French students, and 46 German students, how many students take all three languages...

Homework Statement Homework EquationsThe Attempt at a Solution why are my reactions at A considered wrong? I know that AC and DC are two force-members

Homework Statement Homework Equations Trying to find the reaction forces at E. But, I am kinda confused about drawing the free body diagram for each member. I know that member AD and CB are two force members. What is wrong with my free body diagram then? The Attempt at a Solution i...

Hi, I'm attempting to understand and visualize the Fast Fourier Transform algorithm. Specifically: https://en.wikipedia.org/wiki/Butterfly_diagram I've made a few slow FT examples: I could go to three dimensions, and display a log2(frame_size) series of layers, yet I do not find that...

I thought I'd try out the tikz thing. I am trying to draw a square with the four points A, B, C, and D labeled along with functions listed by each "arrow." I based my code on the triangle that was on the tikz example. Something is obviously wrong. Heck I'd just be happy to get the square to...

Homework Statement We have a crate sitting on a scale that is on the surface of the Earth. We want to come up with the value of the acceleration due to gravity, ## g ##, when we take into consideration the rotation of the Earth. Homework Equations In the book, here's how they go about this...

In the following Møller scattering process, two electrons enter, exchange a photon and then leave (and if I understand this correctly, we say that both of the electrons emitted a photon). However, in this case: We have an electron scattering off a photon, but the interaction happens by an...

Homework Statement Experimental evidence suggests that the nitrogen atom in ammonia, NH3, has four identical orbitals in the shape of a pyramid or tetrahedron. a) Draw an energy level diagram to show the formation of these hybrid orbitals. (hint: No electron promotion is required) b) Name...

Hi everyone, I have been studying the physics of solar cells for a long time. The only thing that I can not completely understand is the physical operation of solar cell based on band diagram. Can anyone briefly explain the movements of carriers from one electrode to the another based on band...

How do I accomplish this? The goal is to redraw the diagram of the ciruit shown below, until it becomes series in the end. Given: Here’s what I did: Diagram 1 2 3 4* 5 *I apologize for flipped images. iPhone camera is tricky. Is this correct? If not, why?

Solve for $\theta$ in the diagram below.

Homework Statement problem in title:Homework Equations 1/Rtotal = 1/r1 + 1/r2...[/B]The Attempt at a Solution [/B] I can get it down to 4 resistors...but the one's I have circled I don't know how they behave. I just need a little kick in the right direction lol. Thank you in advance!

Homework Statement Hello, it is me again, I recently posted about a question on moments and centre of gravity with two planks both 10 Kg in mass and 2m in lengths, uniform, situated on top of each other as shown in the picture. The question asked for the maximum length of x that the system...

Homework Statement Calculate the net force acting on the object indicated in the following diagram. Show your work. Homework Equations cosine/sine law The Attempt at a Solution First I subtracted 10N and 8N (since they are forces acting in different directions): -8.0N (S) + 10.0N (S) = 2.0...

Homework Statement Calculate the net force acting on the object in the following diagram: Homework Equations cosine law / sine law ONLY solving using cosine/sine laws. The Attempt at a Solution First using the cosine law to find the magnitude of the net force: c2=a2+b2-2abcosC c2=122+152-2...

Homework Statement Draw the diagram for the following circuit given the following conditions: 1) X=Y=Z=1 2)X=Y=1, Z=0 3)X=Y=0, Z=1 4)X=1, Y=Z=0 Homework Equations The Attempt at a Solution [/B] ##W=XZ'+YZ##, ##V=Y'Z+XY## 1) W = 0 + 1 = 1 V = 0 + 1 = 1 and now I'm not sure how to get the...

Homework Statement Homework Equations None, just right hand rules. The Attempt at a Solution Can anyone verify that this looks alright? These things are so confusing! Thanks :)

Homework Statement I think two diagrams are wrong here. I've marked in red.[/B] Homework Equations Do you also think the 2 diagrams are wrong? I think for 1st red circle, at delta-- the a1 switch should be open whereas for second red circle at star grounded-- the a1 switch should be closed...

Homework Statement Homework Equations internal change = $$\frac{3}{2}n.R.(T2 - T1)$$ Work = P.ΔV The Attempt at a Solution 1) T2 = $$\frac {P2. V2 . T1 }{P1 . V1} = 1.2 * 10^3$$ 2) Q = Internal change = $$\frac{3}{2}n.R.(T2 - T1) $$ $$ = \frac{3}{2} * 1 *8.3*10^{-3}*(12*10^2 - 3*10^2) $$...

Homework Statement From the phase diagram what can be said of the porosity, mechanical strength, and density of various materials in the diagram? Homework EquationsThe Attempt at a Solution I am having trouble finding research on the general properties of quartz, feldspaar, and clay mineral...

Hi The diagram I am referring is shown at 1:45 of this classic Symphony of Science tune Thanks, Cal

Homework Statement Homework Equations If load is inductive current lags voltage. If load is capacitive voltage lags current The Attempt at a Solution Current lags voltage since wire is inductive. So IF1 lags VF1 and IF2 lags VF2 But book says answer is C Why should VF1 lag IF1? This will...

Could somebody explain me this?: Why is the arrow of the electron-antineutrino pointed towards the W-boson and not as in the second picture upwards? This is my first post and also haven't learned too much about physics yet so please if anything is unclear hit me up.

Homework Statement a) the equivalent single Δ-connected load I have uploaded circuit Homework Equations none yet The Attempt at a Solution I am not sure if the question is asking me to find the resistance of both delta and y connected loads then work out them both in parallel. After I have...

see this diagram of the structure of diamond given in my textbook- I have read in my textbook that each carbon atom in a Diamond crystal is attached to four other carbon atoms by strong covalent bonds.But, in the diagram above I can see that some of the carbon atoms are not attached to 4...

I need some help in checking my work, especially #4. Problem: You have a set of 10 cards numbered 1-10. You choose a card at random. Event A is choosing a number less than 8. Event B is choosing an even number. Draw a Venn Diagram and calculate each of the following probabilities: 1) P(A)...

Homework Statement [/B]Homework Equations [/B] I = G * U The Attempt at a Solution [/B] Hello, i know the solution is 5.0 A/V but i don't know if my way of solving this was correct. I rearranged it to G= I/U and solved this equation for all the values in the table and then added them...

Homework Statement Please look at the screenshot attached. The answer is "Yes", but I am not sure why. Homework Equations N/A The Attempt at a Solution Oxygen have six electrons, but the energy diagram shows only five. That was why I thought it was wrong, but the diagram shown is correct...

Homework Statement Homework Equations To find Ca / Rb we take Ra = 0 --- is this right? I used mason's formula P1 = -G2 G1 H1 Loop = G1, G2, -H1, -H2 Using Mason's Gain we get: Delta1 = 1 Delta = 1 - G1G2H1H2 Using Mason's Gain TF = -G1G2H1 Divided by ( 1 - G1G2H1H2) But substituting the...

Hello, I recently watched a video as an introduction to Feynman diagrams for my own self-interest. The video gave a link to practice problems, and one of them was as follows: In a neutron star gravitational collapse causes valence electrons to combine with protons. Draw a Feynman diagram...