Equivalent Definition and 1000 Threads

Hello! 1. Homework Statement http://i0.simplest-image-hosting.net/picture/uklad.jpg Homework Equations \frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} R = R1 + R2 3. The Attempt at a Solution I have been trying to re-draw the schematics, but with no avail. So far I have figured out that, looking...

Hello everyone ! I am currently reading a paper about crystal properties of R2CuIn3 where R=Tb,H0, Er. It states : 1.that based on bibliography they are crystallized in the hexagonal system P6/mmc. With the use of POWLS software , it was found that there was a second phase Cu2In , so its...

Hi guys, I tried to calculate the Vos and Isc and both of them are zero..so the Thevenin's resistance is 0/0=undefined. How do I calculate the resistance when Vos/Isc fails,such like the wheatstone bridge?

Homework Statement [/B] Homework Equations There's not much to write here except parallel resistors equation. This is supposed to be a superposition problem. How did he use a source transformation because I have no idea why and where he did the equivalent resistor and why did a current...

Homework Statement Hi everyone! I'm trying to find the thevenin equivalent for part A of this circuit: http://imgur.com/4Jdg8w8 Homework EquationsThe Attempt at a Solution I first remove part B, that is, open circuit it entirely. Then I try to find Voc across the two terminals that are open. I...

Homework Statement In the circuit shown in the figure the voltage of the battery is 15.0 V, and the capacitors have the following capacitances: C1 = 2.32 mF, C2 = 2.25 mF, C3 = 4.85 mF, C4 = 4.89 mF What is the equivalent capacitance of the four capacitors? http://tinypic.com/r/24dn5oi/8 Two...

In this damping system it is obvious that the dampers C1 and C2 are in parallel. But I don't understand how "noting the location of force" in this system tells us dampers C1+C2 are in parallel with damper C3. Any help will be appreciated. Thnx

Hi, I was curious how I could turn any expression that looks like: x += (100- x) * 0.01; into a function that could be graphed.

Homework Statement An unprotected radiation worker walks into a room which she knows is sometimes used to store high activity sources. She is unaware that, on that particular day, it contains an unshielded Co-60 γ source. The source is encapsulated in a material which filters out β...

Homework Statement I'm trying to understand where the (β+1) comes from. [b]2. Homework Equations vth=-βiR2 i+βi+is=0 vth=-β(-is/(β+1))R2 [b]3. The Attempt at a Solution vth=-βiR2 i+βi+is=0 vth=-β(-βi-is)R2

1. Homework Statement Find the Thevenin equivalent circuit with respect to terminals a, b by finding open-circuit voltage and the short-circuit current. 2. Homework Equations i1+i2+i3..=0 v1+v2+v3..=0 i=v/R The Attempt at a Solution I was trying to shove this on my own for...

Homework Statement Find the Thevenin equivalent circuit with respect to terminals a, b Homework Equations i1+i2+i3..=0 v1+v2+v3..=0 i=v/R The Attempt at a Solution I set a short circuit across 72V, and calculated that Rth is 6Ω. My first question is, how come I can't always do...

Homework Statement Find the equivalent resistance of the circuit shown below. Homework Equations R=\Sigma_{i}R_{i} 1/R=\Sigma_{i}1/R_{i} The Attempt at a Solution I'm having a lot of trouble understanding how this circuit can be simplified. All I see is a big short circuit where the...

A massless bar of length \(1\) m is pivoted at one end and subjected to a force \(F\) at the other end. Two translational dampers, with damping constants \(c_1 = 10 \ N\cdot s/m\) and \(c_2 = 15 \ N\cdot s/m\) are connected to the bar as shown in figure 1.109. Determine the equivalent damping...

I want to understand the notion of equivalence. \varphi\equiv\psi means that for all structure M, M\models\varphi iff M\models\psi. Suppose that for some structure M and formula \varphi, M\models\varphi(\bar{a}), where \bar{a} are all constants in \varphi. What I can say then by the above...

Homework Statement Hi guys, I'm getting confused trying to manipulate an expression. Any help here would be hugely appreciated. How do I manipulate the expression -4 / (4x + 1)1/2 to become (1/4 + x)-1/2 The Attempt at a Solution I've tried dividing by -4 to get and used an index...

The force-deflection relation of a steel helical spring used in an engine is found experimentally as \(F(x) = 200x + 50x^2 + 10x^3\), where the force \((F)\) and deflection \((x)\) are measured in pounds and inches, respectively. If the spring undergoes a steady deflection of \(0.5\) in during...

Homework Statement the effective capacitance across AB of the infinite ladder shown in the figure The Attempt at a Solution

To prove that two sets are in fact the same, do I actually have to prove that the two are subsets of each other; or could I prove that they are equivalent by some other means, such as invoking the definitions of the sets? For instance, the I am trying to show that the binary set operator...

Homework Statement The Attempt at a Solution as you see I can't obtain Vt=(alpha)it+(Beta) that alpha is thevenin resistance and beta is Thevenin voltage.if there is no problem could you tell me 1-when we find vt or it value instead of their linear equation what does it man? 2-In...

Does having a momentum cutoff require space to be discretized? As an analogy, suppose you put your fields in a box of size L, and require periodic boundary conditions. Then momentum is discretized. The relationship is k=\frac{2\pi n}{L} and \lambda=\frac{L}{n} If you consider your fields in...

Homework Statement Find the Thévenin equivalent of the circuit and the required value of the load for maximum power transfer for Z = 15 + j24 Ω . Homework Equations Voltage divider equation and Z_{in} = Z_{load} 'complex conjugate' for maximum power transfer. The Attempt at a...

There are two "formal" definitions of vectors (and tensors in general) which I've learned. The first is what I consider the "better" definition, one I learned in linear algebra. We call a set X a vector space over a field F whenever that set has properly defined operations of scalar...

Homework Statement Suppose you are given the following affine minimization problem. \begin{align*} \underset{x \in \mathbb{R}^3} \min \hspace{0.1 in}&c^Tx+3c^Tc \\ &\text{subject to} \hspace{0.1 in} Ax \leq b \end{align*} Which of the following is an equivalent linear minimization problem...

Homework Statement S(E,V) = kln(\Gamma(E) )\\ S(E,V) = kln(\omega(E) )\\ S(E,V) = kln(\Sigma(E) )\\ S entropy, k Boltzmann's constant. Prove these 3 are equivalent up to an additive constant. Homework Equations \Gamma(E) = \int_{E<H<E+\Delta}^{'}dpdq\\...

Homework Statement Find thevenin equivalent of resistor circuit Homework Equations The Attempt at a Solution This may be a dumb question, but does a thevenin equivalent NEED to have a voltage source? On my final exam there was a question that asked for the thevenin equivalent of...

Hello! (Mmm) I have to write a parity that is equivalent to the system:$$\left\{\begin{matrix} x \equiv 1 \pmod 4\\ x \equiv 2 \pmod 3 \end{matrix}\right.$$ That's what I tried: $4,3$ are coprime. We want to find a $c$,such that $x \equiv c \pmod {4 \cdot 3}$ We set $M=4 \cdot 3=12...

I need the thevenin equivalent to this circuit, I've calculated Eth and Rth but i don't think my answer is correct

Homework Statement Are the p-norm and and the p'-norm equivalent? With 1 \leq p < \infty and 1 \leq p' < \infty Homework Equations Two norms p and q are equivalent if there is a M>0 and m>0 such that ||x||_p \leq M ||x||_q and ||x||_q \leq m ||x||_p The Attempt at a...

Hi.. I am working as a signalling engineer in Railways. This weekend i am going to give a presentation on super capacitors and their use in railway systems. Most importantly i am going to show how we can replace batteries with super capacitors (EDLC). The problem i am facing is i don't have any...

Homework Statement I have the network attached below. I need to find the open circuit voltage and short circuit current between A and B and then use these to find the Thevenin equivalent for the circuit. The Thevenin equivalent voltage is of the form VTsinwt and the equivalent impedance is...

To every scalar field s(x,y) there corresponds a 'constant' vector field x = A s(x,y) and y = B s(x,y), where A,B are direction cosines. The vector field is only partially constant since only the directions, and not the magnitudes, which are equal to |f(x,y)|, of the field vectors are constant...

Please don't say this is homework because it is not. I am simply studying problems for the physics c exam and I can't figure out this textbook problem. Please show me how to do this! The equivalent resistance part in the most depth because I don't understand. Is it right to say no current...

Homework Statement Q) Derive the expression for the equivalent spring constant that relates the applied force F to the resulting displacement x of the system shown in Fig. 1.86. Assume the displacement of the link to be small. Homework Equations I have solved the question but when...

For this problem, I added in an external source, and found an expression for the external current in terms of ix. Then I divided Vex/iex to get the Rth. Then I did superposition to find the Vth. I had some troubles getting rid of the extra currents, particularly i3 and i2. I was wondering if...

Homework Statement Are these structures equivalent? Here's the professor's rendering: http://i.minus.com/jnojtCx6wYvqD.png The Attempt at a Solution Here's my rendering. The molecule is 1-chloro-2-ethylcyclohexane. I had projected the chlorine out of the page and the ethyl group into the page...

For some reason I had to apply a capacitor in parallel to an AC circuit which has reduced the power factor as a result some power generating AC equipments are complaining (overload). Now I need to apply an inductor in parallel to fix that. For that I need a formula which gives me the...

Finding the Norton Equivalent circuit for the circuit attached I attempted this solution but i am unsure if my Norton's current is correct: R_N = \frac{1}{\frac{1}{6}+\frac{1}{12}+\frac{1}{12}}=3ohms I'_N = \frac{12*2}{12+4}=1.5A, I''_N = 2A I_N = 2A - 1.5A = 0.5A

I am working on the derivation of the angular momentum squared operator (in quantum mech.) and there is one step that I don't see how it works. I'm not sure that this is the right place to post it, but since this is a strictly mathematical question, I figured I would post it here. The...

State the differences between an expression and its simplified equivalent.

How do you determine if the two expressions are equivalent using the subtraction method?\frac{2x^3+7x^2-5x-6}{x+1} - [(2x^2+5x-10) + \frac{4}{x+1}] The textbook says that they're equivalent. I know that, using the subtraction method, they have to equal 0 in order to be equivalent. But, I'm not...

Is "0<d,l<1" equivalent to writing separately "0<d<1" and "0<l<1"? Dear all, I'm writing a paper for a scientific journal and I need to save as much typographic space as I can. In a proposition, I need to specify that the parameters "d" and "l" assume values between zero and one. I am wondering...

Hi, I'm currently writing a lab report on single phase transformers and I need to determine the equivalent circuit with respect to the secondary side. I have already found the parameters with respect to the primary side so it is just a matter of referring them to the secondary side. What I would...

In my textbook, the text says that the following two circuits are identical after rotating it…can someone explain why this is true?

Homework Statement (I added in the R values for reference) Homework Equations GV=I KCL The Attempt at a Solution I am not concerned with the MATLAB portion of the problem, only the setup. I think what the problem wants me to do is: 1) connect a 1A test current from the...

Find the Norton's equivalent for the following circuit attached I have found the Norton's resistance: RN=\frac{1}{1/5.6 + 1/2.2}=1.58k\Omega I am confused on how to approach finding the current because of the +16v variable, what do i do with that variable? do i just treat that...

I have a question about the derivation of the formula for relation between Specific Conductance and Equivalent Conductance i.e. Eq. Conductance = k.V where, k= Specific Conductance ,V=Volume in ml Given link explains the derivation...

I'm having trouble with this problem. Any advice would be appreciated. I know I can't group all resistors together in one loop, but I'm not sure where to draw my loops. Should I choose the 200 ohm and 300 ohm for one parallel and the 400 ohm and 80 ohm for the other parallel? I have a...

Homework Statement Find the voltage and the current through R5 http://i.imgur.com/bL9AFVo.jpg?1 Homework Equations Thevenin's theorem. The Attempt at a Solution http://i.imgur.com/Lz9k8l2.jpg?1 * To find Vth: 1- Open circuit R5. 2- Find the voltage at A and B by determining the current...

Homework Statement Homework Equations Parallel-Series resistors combinations. The Attempt at a Solution Using an approach much like the one used to find the Thevinin resistance: 1- Open circuit between A and B (R1, R2, R3), and short circuit the voltage source. 2- (R4//R5)+R6=170 3-...