Equivalent Definition and 1000 Threads

Hey I can't figure out how to convert the below circuit into its thevenin equivalent. I am used to having two points to work with, but in this circuit there is only one and a ground. http://img715.yfrog.com/i/13332492.jpg/ for some reason the image doesn't show up on my screen; if that's the...

Homework Statement A 5850kg truck decelerates uniformly from 85.0km/h to 50.0 km/h. if 95.0% of the energy reduction is converted into heat, how many kilocalories are produced? Homework Equations kinetic energy (Ek)= 1/2mv2 1 Cal= 4.18J The Attempt at a Solution So first I...

Homework Statement Let n be a nonzero integer and let a be an integer with gcd(a, n) = 1. We have two equivalent conditions which characterize primitive roots: (i) a is primitive modulo n if the order of a is \phi(n). (ii) a is primitive modulo n if for every element b with gcd(b, n) = 1 we...

Homework Statement ^We're asked to find the "Thevenin's equivalent circuit for the source" The Attempt at a Solution I'm a bit unsure how to start this problem. What i initially thought was that i'd combine all my impedances in parallel to the point where it's them combined plus the...

Homework Statement Find thevenin equivelent of this circuit with respect to a and b Homework Equations Mesh Currents The Attempt at a Solution Here I will try to find V(open circuit) = Vth = Vab ((I think this anyways)) I apply mesh currents (any faster methods are welcome if...

hi i have a mosfet circuit question since my prof. didn't explained much about the mosfet I am pre lost.. during the lecture..he show us two circuit diagram.. the mosfet circuit and this regular circuit.. and he ask us why the above equivalent circuit model is a valid representation of...

Hey folks :smile: I just got my student copy of Mathematica 7 and I am really excited to get started. I have some MATLAB m-files that I want to replicate in Mathematica to help me get the syntax. I am a little confused as to where to start writing it though... In MATLAB, you can write...

When using direct substitution to calculate the limit at x = a some functions are simplified so that x = a is actually defined. For example: Lim x->1 [(x^2 - 1)/(x-1)] Limx->1 [(x-1)(x+1)/(x-1)] Lim x->1 [(x+1)] = 2 (when x=1 is substituted in) I understand that they can have the...

If a set A and a set B are equivalent, and it is known that A is complete, can it then be said that B is also complete? What if it is known that A is closed, can it then be said that B is also closed?

I know the following question is elementary, but being a dilettante in QM, I am confused on the following. So, I have two questions. The first question is whether the following reasoning is correct, and if not, why not. First, the Heisenberg Uncertainty Principle (HUP) applies to...

Homework Statement In l_1 (each element is a sequence of numbers such that the series converges absolutely) show that no pair of the norms ||\cdot||_1, \, ||\cdot||_2, \, ||\cdot||_{\infty} are equivalent norms. Homework Equations ||x||_1=\sum_{i=1}^{\infty}|x_i|...

Homework Statement Show that the Euclidean and supremum norms are equivalent norms on R2 The Attempt at a Solution The Euclidean Norm is \left|\left|X\left|\left|1 = \sqrt{x1^2 + x2^2} The Supremum norm is \left|\left|X\left|\left|\infty = max (\left|x1\left|,\left|x2\left|)...

Homework Statement Three resistors with values of 7.0 Omega, 12 Omega, and 16 Omega are connected in series in a circuit with a 9.0 V battery. a) What is the total equivalent resistance? b) What is the current in each resistor? c) At what rate is energy delivered to the 16 Omega resistor...

Am I understanding superposition correctly? Is it equivalent to "all-potential"? In the double-slit experiment, when a single particle is "fired", it will pass through the slits as a wave but hit the receiving end (screen) as a particle. Each particle will clump on the screen, but after many...

Hi Are the two (attached) circuits equivalent? Also, what if any are the relation between the voltages? (ie. V_c, V_R and V_1-V_2) How would we apply Kirchhoff's voltage law? thanks,

I am missing something very simple... in my book, it gives, for capacitors in series, that: 1/C(eq) = 1/C(1) + 1/C(2) using numbers, it says... 1/C(eq) = 1/6.0 uF + 1/3.0 uF ... C(eq) = 2.0 uF I cannot figure out how they got C(eq) = 2.0 uF Thanks

Homework Statement Use Norton's Equivalent Circuit to find current I through 15ohm resistor. Homework Equations norton's theorem states that any two terminal network that includes many sources and resistors can be converted into an equivalent two terminal network with one current...

Homework Statement Find the equivalent resistance between points a and b in the figure Homework Equations 1/Req = 1/R1+1/R2... for parallel Req= R1+R2... for series The Attempt at a Solution 12.63 ohms

Homework Statement Problem: What single, equivalent resistor could replace all of the resistors in this circuit? Given R1 = 4, R2 = 5, R3 = 14, R4 = 9 Homework Equations In series, R1 + R2... = Req Parallel, 1/R1 + 1/R2... = 1/Req The Attempt at a Solution I have tried...

Homework Statement A medium is described by the response functions \varepsilon (\omega ) and {\mu ^{ - 1}}(\omega ) in \textbf{D} = \varepsilon (\omega )\textbf{E}, \textbf{H} = {\mu ^{ - 1}}(\omega )\textbf{B}. Construct the equivalent dielectric tensor {K_{ij}}(\omega ,\textbf{k}) in...

Homework Statement I was just wondering if say A is a 2x2 matrix. Is A^2 equivalent to AxA or all the elements of A are squared? Homework Equations let A and B be 2x2 matrices. is the following true? (A-B)(A+B) = A^2 - B^2 The Attempt at a Solution

Hi, I got a question in my exam ask for the equivalent resistance, The Question is: Find the equivalent resistance for this circuit using Kirchoff Rules I build the Image by circuit maker. http://lookpic.com/i/965/ud67CMW6.jpeg R1=2 Ohms R2=2 Ohms R3=2 Ohms R4=4 Ohms R5=1 Ohms i know that...

Homework Statement See figure Homework Equations \sum F_{x} = 0 \sum F_{y} = 0 The Attempt at a Solution I'm confused as to how to check which systems are equivalent. Do I just have to simply reduce all the systems to one force? I tried comparing systems (a) and (b)...

Homework Statement I am being asked to draw the Thevenin equivalent for and to calculate the voltage that would appear across RL if it were connected across the 2 output terminals. Using Kirchoff's law I found that the voltage across RL is -12.5 V. However I am really suppose to do it using...

I'm having trouble finding the norton equivalent resistance for the attached circuit. I reasoned that once you short the source, you just get the (3ohm+2ohm) in parallel with the 4ohm resistor. However the answer I'm getting is not the one given in the book (I get 2.22ohms, when it...

Homework Statement To find the equivalent capacitance of the following network (image attached at the end of the post). The blue capacitors have capacitance of 2C and the black ones have a capacitance of C. Homework Equations Q = CV where Q is the charge on a capacitor, C it's capacitance...

hi everyone! I have just posted a thread which was about the equivalent lagrangian. and I think I have another problem with it too! again in section 11.6 d'inverno, it is said that if you use equation 11.37 then you can achive (∂L ̅)/(∂g_(,c)^ab )=Γ_ab^c-1/2 δ_a^c Γ_bd^d-1/2 δ_b^c...

Hi everyone! again problem with d'inverno's equation! ok let me see, in chapter 11 section 11.6, it is said that (∂L ̅)/(∂g^ab )=Γ_ac^d Γ_bd^c-Γ_ab^c Γ_cd^d as we see at first if you derive (∂L ̅)/(∂g^ab ) from equation 11.37 you can have the above result. but my professor said it's...

Homework Statement An automobile battery has a terminal voltage of 12.8 V with no load. When the starter motor, which draws 90 A, is running, the terminal voltage drops to 11 V. What’s the internal resistance of the battery? Homework Equations I think the solution must involve finding...

Homework Statement The circuit is attached as a jpg image. How can i find the norton equivalent when both current sources and voltage sources are present? please help Homework Equations The Attempt at a Solution

Hi guys. I looking at a vibrations problem with 2 springs in it (System A). I need to find an overall value for the stiffness K to find the natural frequency of the system. I know that normally when 2 springs are in series I should get the sum of (I/Ki)^-1 which would give me an equivilant...

Im getting a new laptop sometime soon, the thing is that ms office is setting me back a bit. I was wondering if there are any free office equivalents that anyone here has experience with? I guess at most I'd use powerpoint and word if that's any help at all.

If I have a set of Probability distributions on a product space with marginal constraints, is there any way to (how to) express the same as a linear family of PD's ( i.e. all P s.t. E_P[ f_i] =a_i for some f_i, a_i )

When are two or more measures said to be measure theoretically equivalent? I have spent sometime on searching it; I am not getting it. Please someone help.

I'm trying to prove that the axiom of choice is equivalent to the following statement: For any set X and any function f:X\to X, there exists a function g:X\to X such that f\circ g\circ f=f. I was able to prove that the AoC implies this, but I'm having a harder time going the other...

Suppose that all resistors have a value of 100 ohm how to find the equivalent Resistance of these circuits, the number in these circuits indicate the areas for which we will be completing calculations. how to go over thesehttp://img155.imageshack.us/img155/8421/32990280.jpg...

Hi everyone, The practical equivalent stress in a welded part, subjected to torque and bending stresses, is the square root of the sum of the two squared shear stresses (from torque & equal shear) squared, + the normal stress (from bending) squared. Is it accepted/common to use this way to...

I've just listened to an online lecture where Susskind explained Bell's inequality () Basically he shows that classically A\cap \overline{B}+B\cap \overline{C}\geq A\cap\overline{C} Then he uses spin measurements with 0°, 45°, 90° to the z-axis for A, B, C to measure spins of an electron...

Homework Statement Find the Thevenin equivalent at terminals A-B of the circuit below. http://img5.imageshack.us/img5/1723/thevenin.jpg Homework Equations The Attempt at a Solution

Homework Statement How can you get an equivalent of tan(t) in the neighborhood of Pi/2? Homework Equations the answer is 1/(Pi/2-t) The Attempt at a Solution I tryed to use a Taylor's expansion but the problem is that tan(Pi/2) does not exist. Thanks for your help!

Homework Statement What is the equivalent capacitance of the arrangement shown in figure. (Answer is C1) Homework Equations Cparallel = C1+C2+...Cn Cseries = 1/(1/C1+1/C2+...+1/Cn) The Attempt at a Solution

On the first image i have to find the thevenin equivalent viewed from terminals x, x' & y, y' i get the Req as 7.32ohms but now i am having trouble calculating the vth, i have no I to calculate thanks in advance

Hi All Is there a proof that all blind-memoryless search strategies are equivalent? By equivalent I mean that no blind-memoryless search strategy can outperform any other in terms of time to goal and domain coverage. It seems to me that this is intuitively true. How would I go about...

Homework Statement How can one find an equivalent of 1/n^(a) in the neighborhood of +infinity? And what's the method in general to get an asymptotical development of a sequence? Homework Equations The result is: 1/n equivalent to ln(n+1)-ln(n) 1/n^a equivalent to...

What is the equivalent resistance of the circuit in Fig. P29 between terminals A and B? R1 = 5 , R2 = 5 , R3 = 5 and R4 = 1 . Note that the wires cross but do not make contact at the center. V= IRe IRe= IR1 +IR2 Series= Re= R1+R2 Parallel= 1/Re= 1/R1+R2 Re= R1R2/R1+R2 I am assuming...

Hi, Lets say the electric and magnetic fields in an closed surface (2-D) are known. Is it possible to derive electric/magnetic currents that can create these fields? We can assume that the closed surface is homogenous with constant permittivity and permeability. Is this a well known...

Homework Statement hi guys, i'm having trouble applying Kirchhoff's laws to determine the equivalent resistance of this symmetrical array of resistors (see attachment); i think there is a quick trick, using 4 current loops, but i can't remember it... nor find relevant documentation – this is...

Hi, Suppose I have the following circuit (excuse the ugly drawing): Suppose the generator is 1A and all the resistance are 1 Ohm (the values are not important). Moreover, suppose I already have all the voltages in V1, V2, V3, V4 (which I got using nodal analysis), and V0 is set to ground...

Homework Statement 3 identical resistors..give the equivalent resistance of the circuit.? The diagram can be found here: http://img27.imageshack.us/i/physicsquestion.jpg/ Homework Equations The Attempt at a Solution

Homework Statement Hi, I'm trying to solve this problem on MasteringPhysics: This circuit is given, and it says C-eq for the circuit is 9.22 microfarads: http://img143.imageshack.us/img143/3475/walker4ech21pr118.jpg The question is to find C in the figure knowing C-eq is 9.22...