Analysis Definition and 999 Threads

How one can analyse an image of a solid material obtained with an optical microscope ?

Hi, We have an axial fan in the lab that apparently vibrates badly ("wobbles") at certain frequencies. To find the resonance and the bad frequencies, I decided to do an ANSYS modal analysis. I am still pretty new to it, and have a few questions. 1) Regardless of how many modes I pick...

given: source voltage =120V voltage across 15 ohm resistor = Va there is a dependent source 2Va and a 30 ohm resistor. I tried applying KVL i.e 120-30I+2Va-Va=0 where Va=15I and got I=2.66A whereas my teacher told me that the answer is 8A. how is it so? Is it some basic knowledge that I have...

Hi Guys, I am self teaching myself analysis after a long period off. I have done the following proof but was hoping more experienced / adept mathematicians could look over it and see if it made sense. Homework Statement Question: Suppose D is a non empty set and that f: D → ℝ and g: D →ℝ. If...

Homework Statement I know it's not directly related to engineering, but its from an engineering economics course! Homework EquationsThe Attempt at a Solution Hello, I'm trying to solve this problem, and my first thought it to find the present value of each machine $$ PV =...

Let's say we have a free-source series RLC circuit. The differential equation that describes the behavior of the transient is given by Ri+L\frac{di}{dt}+V=0, where V is the potential difference across the capacitor. But I have trouble understanding the way this equation is developed. For...

Homework Statement Find Voc Homework EquationsThe Attempt at a Solution This is what I have: (VA-9)/5 +VA/5 + 1.8 = 0 VA=0 -1.8 + VB/(60+10) +(VB-9)/20 VB=35 What I'm confused about is why you combine the 60 ohm and 10 ohm resistors for the VB nodal equation, but not the 25 ohm and 10 ohm...

Hi, I have one spot remaining to take a pure math course, and I'm trying to decide between complex analysis and group theory. Although I've touched some of the basic of dealing with complex numbers in my physics/DE courses, they haven't gone in much depth into them beyond applications. On the...

I have to model a storage vessel in ansys and perform stress analysis for it. I have no idea about which element types I will need for the analysis. I have calculated the design dimensions for the vessel. I am a beginner at ansys and know only how to deal with simple structural and thermal...

Dear Physics Forum friends, my old friend recently gave me a book called "Advanced Calculus" by Loomis/Sternberg, published by the World Scientific. I had taken a look at that book, and it seems to be that the book treats the vector calculus, linear algebra, and some topics on the mathematical...

Homework Statement Homework Equations Thevenin theorem The Attempt at a Solution ##R_{60+180}=240## ##R_{80||240}=\frac{240*80}{240+80}=60## ##R_{total}=60+20=80## ##=\frac{480}{80000}=0.006A## How should I proceed?

Homework Statement Find the voltage in A,B,C,D when the circuit is grounded at point A Homework Equations ##V=IR## ##\sum_{i=1}^{n}I_n=0## ##\sum_{i=1}^{n}v_n=0## The Attempt at a Solution I have managed to divide the current according to KCL, but I am not sure how should I approach...

I have been browsing the web, and I notice that I could not find any websites that have real analysis text around. Yes, I understand that I should look for books written by professionals in the field, but I do not know which one I should buy. Do you know of some online resources to real analysis...

Homework Statement *Posted in the Screenshot* Homework Equations *Posted in the uploaded attachment* The Attempt at a Solution *Posted in the uploaded attachment*Hi all. Our lecturer gave us the question as part of an assignment but I'm not to sure if my approach and answer is correct. I...

I have completed a small project of ac circuit analysis on intel galileo in arduino. I want to make a GUI now. How should I proceed? I know C and a little C++.

I've been assigned the following problem for homework in my Electrical Engineering class: *Note, the duplicate v2 is supposed to be v3. But I keep getting v1 = 4.10V v2 = 4.81V v3 = -1.19V and i0 = 52.9mA Every simulator I've put this into says it's wrong, yet I've attempted solving it...

Hi I was wondering how you would account for mean stress (such as using with goodman equation) using von mises with miners rule due to variable loading Thank you

1. I ´m trying to do the dimensional analysis of the Delta Dirac in 3 Dimensions. [PLAIN]http://[url=http://postimg.org/image/oif09fcd5/] 3. This is my atempt [PLAIN]http://[url=http://postimg.org/image/4qavbtv4p/]

Homework Statement I have to prove that RI = RSRP/(RS - RP) by circuit analysis. The Attempt at a Solution [/B] So I tried to create a system of equations to do this: For the first circuit using kirchhoffs rules: V-IA(RS + RI) = 0 [1] For the second circuit: V-IBRS - IPRP = 0...

Homework Statement Using nodal analisis we need obtain the differential equation 2. The attempt at a solution For I1 and take the point under C as reference, but i am stuck on it

I hope this post won't become too tedious. I've completed my undergrad studies in physics and if things go well i will begin my master's degree in April. The thing is, since my path to graduation has been peculiar (to say the least) I'm kinda weak in maths skills atm and need to improve. I'm...

I am working on a thesis, but new to programming. What is the best and easy to use program that I can use for the work: Measurement and analysis of elastic scattering of alpha–particle and light heavy ion scattering using nucleon-nucleon interaction

I forgot to formally introduce myself on this forum. I am VKnopp. I am 14 year old maths enthusiast with Asperger's Syndrome. I self-educated myself all the way up to Calculus III with a little bit of number theory, linear algebra, complex analysis and real analysis supplements. I am in the top...

Hi ! at the moment, I have big troubles to solve exercices for my analysis homework. This is not a problem with an exercise in particular, it really is about how to solve things. I just started a bachelor's degree in physics and I have no mathematical maturity. I can easily use mathematics to...

Hi, I was wondering which stress values from a finite element program to use for fatigue analysis, (von mises, principal, tresca). I was leaning towards principal stresses but then would my stress range be σ11 from load case 1 (LC1) to σ11 of LC2, or would i need to do σ11-σ33 first and then...

Homework Statement The problem want me to do a degree of freedom analysis on the following process using the information provided. There are two chemical rx in the process. The desired production rate of DEA (D) is 105,000 kg/h. The air composition is 21% mol% O2 and 79 mol% N2[/SUB. 25% of...

Hello all, I am a physics major in my 2nd year. My current math courses include vector calculus and differential equations. I have a bit of a desire to try my hand at analysis next semester. The first course I would take assumes no prior knowledge of proof writing and builds from the ground up...

Hello, In my statics course, we had to design a bridge, and now, I have to calculate the internal forces in every member of the truss. At first, I have found Ay and Oy with the moment of force, but then, I am stuck since the truss is not perfectly aligned. Sadly, I can't use the method of...

Homework Statement Find V1,V2,V3,I1,I2,I3 Homework EquationsThe Attempt at a Solution Analysis at super node: V3-V1=40 (equation 1) (V1/40)+(V1-V2/40)+(V3-V2/20)=0 2V1 - 3V2 +2V3 = 0 After substituting in equation 1: 4V1-3V2 = -80 Analysis at V2 (V1-V1/40)+(V2/20)+(V2-V3/20)=0 After...

As an undergraduate, which graduate-level course will prepare me better for grad school, Complex Analysis or Topology? I probably can't fit both into my schedule, but I can definitely fit one. I have already taken undergraduate complex analysis and I'm taking now undergraduate topology. My...

Let ##\mathbb{X}## be the set of all sequences in ##\mathbb{R}## that converge to ##0##. For any sequences ##\{x_n\},\{y_n\}\in\mathbb{X}##, define the metric ##d(\{x_n\},\{y_n\})=\sup_{n}{|x_n−y_n|}##. Show the metric space ##(\mathbb{X},d)## is separable. I understand that I perhaps need to...

Homework Statement In a desperate attempt to come up with an equation to use during an examination, a student tries the following equations. Use dimensional analysis to determine which of these equations could be correct. Here x, v, and a, are the position, velocity and acceleration. v2=ax...

i have just started taking electric and electronic circuits course and i have a question about a basic concept in KVL, regarding the loop direction that you assume in any circuit : does the loop direction that you assume is just telling that you will subtract the voltage of the near points from...

Homework Statement Find V1. I attached a picture for the circuit. Homework EquationsThe Attempt at a Solution This is what I did (Refer to Fig. 1): -2A + (V1)/(50) +(V1-45)/(1) = 0 But when I looked at the solution my professor posted this is what he did (Redrew Fig.1 as Fig.2): -2A +...

Homework Statement A capillary filled with water is placed in a container filled with a chemical of concentration C_{0} , measured in number of molecules per unit volume. The chemical diffuses into the capillary of water according to the following relation (where x is distance along...

Homework Statement S≡{x|x∈ℝ,x≥0,x2 < c} Prove Sup S = c Homework EquationsThe Attempt at a Solution Since x in the set real numbers, there are two cases for x: x < 1 or 0 <= x <=1 if 0 <= x <=1, then x < c + 1 since c is positive. if x < 1, then x^2 < c < x*c + x = x(c+1) thus x < c+1, by the...

Homework Statement Use node voltage analysis to determine values for I1, I2, and I3. If a current has a negative value, then the reference direction chosen was incorrect and the current is positive in the opposite direction. I attached a picture of the circuit. The things in blue (current ix...

I can get some old massive size power transmission cable straight out of the power station. I have the space to erect some posts and go just over 500m but with permission I might get 1km or more. Will use a metal pipe in the ground for ground. This is not technically a dipole, would a dipole...

Suppose we pick a matrix M\in M_n(ℝ) s.t. all its eigenvalues are strictly bigger than 1. In the question here the user said it induces some norm (|||⋅|||) which "expands" vector in sense that exists constant c∈ℝ s.t. ∀x∈ℝ^n |||Ax||| ≥ |||x||| . I still cannot understand why it's correct. How...

Homework Statement I posted the problem in the picture below.[/B] Solve for the currents I1,I2,I3,I4 Homework EquationsThe Attempt at a Solution This was my attempt at it using KVL and KCL: For I1 loop: 8I1-6I3 = -5Vx For I2 Loop: 5Vx + 15(I2+3) + 10I2 = 0 5Vx+25I2 = -45 For I3 Loop...

Hello world! I'm busy working through Halliday/Resnick Fundamentals of Physics chapter 1 and I'm having some difficulty with this particular question. I'll do my best to explain my reasoning and attempt at the problem 1. Homework Statement The problem: Three different clocks A, B and C run at...

Homework Statement Here is the homework problem I was given: The Attempt at a Solution Above is the work that I began, however, I have an overwhelming feeling that I am incorrect and also I don't know how to continue to the next part/parts. Would someone please help me? Thank you H

I was trying to convert a quantity in BTU/(ft*hr*F) to W/(m*C) and I can do it just fine by using a conversion factor from a table online, but what I want to know is how to come up with that conversion factor. The conversion factor I looked up and have been using is 1 BTU/(ft*hr*F) = 1.73...

Homework Statement Solve using the Mesh-current method. Determine the current magnitudes and the voltages across all elements Homework Equations i=v/r i1+i2+i3..=0 The Attempt at a Solution loop 1: 16(i3-3)+25i1-5i2=12 loop2: 4i1-5i2=15 1) i1=5/9i2-1 substituting 1) into loop2 gives...

I have started a class on the analysis of calculus. We are three weeks in and have covered some basic set theory, fields and axioms, and now we are beginning induction. It is a very rigorous course and I hoping someone might know of some helpful resources that could aid me throughout it. Ideally...

Homework Statement Derive the differential equation that relates the voltage (V) to the current (I) entering the circuit. Homework Equations Let: ic = C dV/dt = current traveling through the capacitor (C) ik = (V+Ek) / Rk = current traveling through the potassium (K) channel iNa = (V-ENa) /...

I came across a technique called "multiple-scale analysis" https://en.wikipedia.org/wiki/Multiple-scale_analysis where the equation of motion involves a small parameter and it is possible to obtain an approximate solution in the time scale of $$\epsilon t$$. I am wondering if it is possible to...

Hi PF contributors, Have there been attempts to apply nonstandard analysis to the behavior of photons? For instance, considering the mass of a photon to be infinitesimal. I'm guessing the answer is yes so if you could provide references, I would be much obliged. phoenixthoth

I know that when we have to identify the nodes for solving a circuit with nodal analysis we always have to designate a reference node (which will be the ground node) as a reference for measuring the others' voltages. However I was practicing this and I found this example on...

Good evening people. Recently I started taking the "electric network analysis" course in my school. We already saw the mesh analysis method for solving circuits. Now we are seeing the node analysis method. I understand that the first step for this method is finding the number of nodes (and one...