Equivalent Definition and 1000 Threads

http://img855.imageshack.us/img855/5369/eehmwk.jpg [b] I haven't done this before with 2 voltage sources so I'm not sure how I would go about doing it. If someone could show me step by step how to understand this, I would appreciate it. Equivalent resistance = 2.5ohms, right? But...

Homework Statement Derive an expression for the equivalent small-signal conductance Geq (or resistance Req). Homework Equations Geq = \frac{i_t}{v_t} vt = vg vs = 0 vd = -vt The Attempt at a Solution Attachment - EE HW 2 I drew the small-signal circuit, from what I...

I am currently self studying Calculus I and was curious if it was possible to just self study most or all mathematics on my own without going to college. I would like to learn the equivalent of a BS in pure mathematics, so topics such as topology and such. So is this possible? Practical? And if...

Homework Statement Show that the two formulas are equivalent integral [sec x dx] = ln|sec x + tan x| + C integral [sec x dx] = -ln|sec x - tan x| + C Homework Equations Pythagorean ID's? Log rule of addition The Attempt at a Solution Well, I realized the formulas can only be equivalent if...

Hi guys, This is from so called ratio test, which says The series Ʃa(n) diverges if abs{a(n+1)/a(n)} ≥ 1 for n≥N where N is some fixed integer. I was wondering if I could replace the condition with lim inf abs{a(n+1)/a(n)} ≥ 1. So basically what I'm asking is whether these two below...

Homework Statement Twelve resistors, each one with a resistance of R ohms, form a cube (see attached figure). Find R17, the equivalent resistance of a diagonal of the cube. (The first attached picture was scanned from the book "Physics" by Halliday, Resnick and Krane, 4th edition.)...

I was wondering if there is currently a project by some government or NGO, in the same spirit as the Svalbard Global Seed Vault, to digitize all information (history, math/science, literature, etc.) and store it either somewhere safe on the planet or better yet on some other celestial body in...

Yes I know it's a really stupid question, please don't make fun of me. But when they first defined this new function, the integral of 1/x, and had no graph or knowledge of how it looked, how could they know it was a logarithm? More specifically, the logarithm with base e.

Given X=R∞ and its element be squences let d1(x,y)=sup|xi-yi| let d∞(x,y)=Ʃ|xi-yi| then there exists some some x(k) which convergences to x by d1 but not by d∞ ,for example let x be the constant squence 0, i.e xn=0 ,and let x(k)n=(1/k2)/(1+1/k2)n then d1(x(k),x)=1/k2 and...

Homework Statement Find a collection of well-formed formulas Ʃ such that Ʃ has no independent equivalent subset. Homework Equations N/A The Attempt at a Solution So far I have been able to show that Ʃ must be infinite. However, after this, I get stuck. Could anyone give me a hint...

Homework Statement If in Joule's paddle wheel experiment a block of mass 10 kg is allowed to fall through 22.5 meters and the mass of the water is 50 grams. What is the total increase in temperature of the water? Can your value of J be used for determining how much mechanical energy can...

Homework Statement Hello, i was studying diodes for my exam on monday, but i had some struggle finding the Thevenin equivalent. Here is the circuit: http://img411.imageshack.us/img411/5336/schakeling.png Homework Equations I have no clue what to put here? The Attempt at a...

can someone explain to me why it seems that the smaller the diameter of pipe bend (i.e. 90 degree elbow = 30D) the shorter its equivalent length becomes? for 1.5" diameter = 45" equivalent length while 2" diameter = 60" length. does this mean 1.5" diameter 90 degree elbow has less friction than...

I need help calculating the magnitude of the impedance for a RLC circuit shown below. See the attached schematic. I found the impedance magnitude of a similar circuit here: Impedance Formulas ...see the 4th circuit from the bottom (let's call its impedance Z_a). Unfortunately, I do not know...

Here the attachment is the question. I have some experience in solving Thevenin with Voltage source, but not with current source. Any idea? thanks and regards, May

How to find value in root finding exercise? I am designing a fountain for a Vegas hotel which sprays water in the shape of a hyperbola onto a screen. The hyperbolas shape is a function of several different variables. I am looking for conditions which will cause the area cast by the bottom and...

hi everybody, please help me if you can the question in this link . i try many many times but i don't know how i can solve thevenin equivalent with dependent sources. tomorrow i have a home quiz on this question. http://imageupload.org/?d=49E036571

Homework Statement I had a general inquiry about a relation in my physical chemistry textbook. It stated that when determining the partial pressure of an ideal gas component in a mixture/solution, instead of using the standard Dalton's law: Pi = xiPtot, one can simply use the relation Pi =...

Hi! Could anyone please tell me the meaning of Tow operators are unitary equivalent. I tried Wiki but I did not get my goal.

Homework Statement Find the Thevenin equivalent network of the lattice network (see attached), viewed from points As and Br (terminals Bs and Ar are not connected to anything). Homework Equations The Attempt at a Solution Without the resistance f, the problem is quite simple. I...

I'm asked to find an equivalent resistance and the current through each branch of the following circuits. (r is a fixed arbitrary value for all resistors in the circuits) Homework Equations V=IR Sum of I at a node = 0 Sum of V about a closed loop = 0The Attempt at a Solution I've been playing...

Equivalent capacitance... A hard one!? Homework Statement Calculate Equivalent capacitance between A and B: [PLAIN]http://scsupport.org/moodle/file.php/13/Chapter26/imgch26q14.gif EDIT: If you can't see the picture, see 3rd post for file attachment, sorry!Homework Equations C1 = 3.55 µF C2 =...

Hello! Am I right to conclude that: y^2(A(\frac{x}{y})^2 + B(\frac{x}{y})+ C) = Ax^2 + Bxy + Cy^2 Only when y does not equal zero. I'm guessing I could evaluate the function lim y -> 0 but this is not the same as y explicitly equalling zero, is it? On the RHS, y can equal zero, on the...

For the circuit below, can someone please help me understand why Zeq = 0 (in words...not by solving): I know Vth = 50<0° since this is the voltage drop across the parallel elements. I don't understand why the equivalent impedance would be 0. I know when you shut off a voltage source...

I want to model a coil circuit with induced EMF. I want to verify that my model is correct in a circuit. That the voltage developed across the load is calculated correctly. From the equivalent circuit, you can see the current depend on the jX_L and it acts as a low pass filter in the complete...

Hello -- I have some reference object R (e.g. a protein), and I've got two transformations t1 and t2 (e.g. a transformation = quaternion + translation). In my case, t1 and t2 were obtained from symmetry operations. So after applying t1 to R I get object T1, and after applying t2 to R I get...

Homework Statement The problem wants me to find the equivalent resistance at the terminals. Here is the circuit plus some of my work. The Answer according to the teacher is C. http://i.imgur.com/JaW7f.jpg Homework Equations The Attempt at a Solution As seen from my work, I added...

Homework Statement What is the equivalent resistance between points a and b: [PLAIN]http://img706.imageshack.us/img706/8615/circuitq.jpg The Attempt at a Solution The correct answer is Req=25 Ω. Looking into the circuit the 20 Ω is in series with the 10 Ω which is in parallel with...

Homework Statement [PLAIN]http://dl.dropbox.com/u/9699560/EE%20Problem.jpg (I added the text V1, V2, and Voc to the image). I'm only trying to find Voc because I got the wrong answer. I got Isc correct. Homework Equations Basic node voltage analysis techniques. The Attempt at a Solution...

Picture an 8ma ideal current source pointing downward in parallel to a 20kohm resistor on the left of this picture. Wouldn't these elements contribute to the voltage drop across A and B. Rth makes sense because the ideal voltage source will be shorted eliminating the last resistor but the...

Gentlemen. Homework Statement Calculate the Thevenin equivalent resistance. Homework Equations Rseries - Rtot = R1 + R2 + ... + Rn Rparallel - Rtot = 1/(R1^-1 + R2^-1 ... + Rn^-1) The Attempt at a Solution As the picture shows, The second ohm-meter tells me 5.7 Ohms is...

As I understand it, J's MEoH is the calorific value of a substance. The standard value for this constant is given for raising 1 lb or kg of water by 1 degree. I am using equations which use J's MEoH but with other substances. The equations come from a book on steam turbines so they no doubt...

Homework Statement I'm trying to figure out how many unique (non-equivalent) logical statements are possible with n statements...I think I could figure that out as soon as I see a pattern so I would like to know how many are possible for 2 statements and for 3 statements Homework...

Are there any areas of Chemistry that are dedicated to the study of elementary particles e.g.the Standard Model?

Homework Statement Homework Equations The Attempt at a Solution

Homework Statement Homework Equations delta wye transformations? The Attempt at a Solution I feel like I should do delta wye transforms here, but that doesn't really lead me anywhere. Am I missing how I should do the problem?

Hi all, I am trying to understand the concept of equivalent stiffness of a beam. As I see it, the equivalent stiffness is the stiffness of a linear spring that would deflect the same amount under the same load. For a cantilever beam with a load P and a deflection \delta at the free end, if we...

In my research project I arrived at a particular case where the energy spectrum is given by the following transcendental equation \sqrt{-\frac{E}{E+V_D}}=\tan\frac{a\sqrt{\frac{2m}{\hbar^2}(E+V_D)}}{2} In the literature I found the equivalent expression below \cot...

[b]1. Hi everyone, i was given an AC circuit (capture.png) and am required to find the value of the variable resistor Z so that average maximum power is delivered to it. To solve this i am trying to find the thevenin equivalent circuit but i am stuck and unable to figure it out. Any help would...

Homework Statement http://img716.imageshack.us/img716/8021/69925791.jpg Find The Thevenins Equivalent of the circuit shown . at the terminal a and b i think Homework Equations Vth = Rth(Ith) V= IR The Attempt at a Solution For Vth i tried using Nodal Analysis Having 4 Node Voltages but i...

Homework Statement Prove that in R^{n}, the euclidean metric, the d_{\infty}=max{|a1-b1|,...,|a_{n}}-b_{n}|}, and d = |a1-b1|+...|a_{n}}-b_{n}|. Homework Equations Uniform Equivalence: basically p,d so that we have the two inequalities with some constants like p(x,y)\leqAd(x,y) and...

Homework Statement Prove that weak induction is equivalent to strong induction. Homework Equations To prove this...we assume weak induction. That is (i) 1 \in S (ii) n\in S \Rightarrow n+1 \in S for all n in N The Attempt at a Solution So to prove strong induction we...

Homework Statement Find Req. Homework Equations Series: R1 + R2 + ... Parallel: 1/(1/R1 + 1/R2 + ...) The Attempt at a Solution There's no solution for this one in the book but I'm thinking that I can break this up into two parallel sets. Parallel1...

Homework Statement Hi If I am dealing with an overdetermined system Ax=b, then I can (assuming A has full rank) find the unique approximative solution by least squares. Now, in my book it says that: "For a full column rank matrix, it is frequently the case that no solution x satisfies...

Homework Statement I am reacting methyl salicylate with sodium hydroxide to form salicylic acid. I am required to find the equivalent of sodium hydroxide, however I've never even heard of such a term. I didn't learn anything about "equivalent" in Intro Chem. Can anyone help? There are no...

1. what is the boolean equivalent of shaded area https://www.physicsforums.com/attachment.php?attachmentid=38605&stc=1&d=1315313022" i tot its abc'+a'b'c but its not one of the options...

Homework Statement Homework Equations Find equivalent thevenin circuit The Attempt at a Solution I found the equivalent thevenin resistor already. The 1000 + 500 are in parallel. Come out to 333.333 equivalent. Equivalent is in series with 1000, then its 1333.333 1333.33+1000...

How do you redraw a three-input OR gate circuit using only 2-input NAND gates?

Hi Guys, I'm having trouble finding the equivalent moment of inertia for a system. Basically it's a mass attached to a string, which is attached to a shaft. As the mass drops, the string unravels imparting some rotation on the shaft, this shaft rotates a small flywheel, and also rotates a...

Homework Statement For 1 and 2 : Find the equivalent resistance for the resistor network provided Homework Equations For resistor in series : Req = R_{1}+R_{2}+...R_{n} For resistors in parallel : Req = (1/R_{1}+1/R_{2}+... 1/R_{n})^{-1} The Attempt at a Solution For...