Equivalent Definition and 1000 Threads

Homework Statement I have a attached a photo of the problem I'm trying to solve. I defined x1 as displacement of the bar at the k1 spring, and did so similarly for x2 & k2. It is known k1=k2 as the bar lies flat in equilibrium before the force is applied.+ By taking the moment about F, I...

Homework Statement Part A Given 4 capacitors of the same capacitance C, (a) list all values of capacitance you could obtain by connecting up to 4 capacitors. (b) Construct a table with two columns: the first column contains all possible values of capacitance in increasing order, and the...

Homework Statement In the figure, C1 = C5 = 8.0 microF and C2 = C3 = C4 = 4.2 microF . The applied potential is Vab = 230V Homework Equations 1/Ceq=1/C1+1/C2+...+1/Cn(for series connections) Ceq=C1+C2+...+Cn The Attempt at a Solution The answer is 2.4x10^-6 So far I have...

Homework Statement I really just need help understanding how to re-draw a resistor diagram after calculating an equivalent resistor. Now in the picture given in the attachment, you can see that R1 and R6 are in series with each other when I compute their equivalent resistor(R1+R6), on what...

I heard this assertion during a discussion: If two matrices are similar, but one is symmetric and the other is not, then the two matrices are not unitarily equivalent. Why is this true? This was only mentioned in passing, and I definitely don't understand why.

Let me phrase the entire question: How is acceleration equivalent to rest in a gravitational field (without tidal effects)? It's not that I am incapable understand the implications of this--it comes from a quote by DaleSpam and it seems to be rich--I just cannot break down the language he is...

Homework Statement Experts recommend a release angle of 35 degrees for javelin throwing, use this as the release angle. Determine what the length of the equivalent throw on the moon would be. Clearly communicate the procedure you followed, and fully justify your answer. Homework...

Homework Statement Given 4 Identical resistors, I need to be able to find the 9 combinations of circuits with equivalent resistances Homework Equations Do I just keep flipping between parallel resistor sequences? The Attempt at a Solution I drew 3 different circuits that I...

theravin equivalent resistance/current little help! Homework Statement Homework Equations The Attempt at a Solution found theravin voltage (=-3.75V) but i have a question about the current. the answer is supposed to be -1mA and i found the only way to get this answer was to ignore the...

I was fiddling around with the definition of limits at infinity and believe I have found a statement that is equivalent to the definition. So the question is this: are the following two statements equivalent? (1) \lim_{x\rightarrow\infty}f\left(x\right)=L (2) \exists c>0\exists...

Attached is a schematic of interest. Assume same voltage source and capacitance for each capacitor in each circuit. Correct me if I'm wrong, it appears all circuitry comprises two basic types of connection: series and parallel. I'm trying to figure out an approach to determining whether a...

Hello, I am looking for some strategies for figuring out the best way to approach problems asking me to find the equivalent capacitance when given a daunting looking circuit with capacitors arranged in all sorts of funny ways, especially when issues come up of capacitors not contributing to...

Homework Statement The (b) circuit shown in the attached image is the Norton equivalent circuit of the (a) circuit. Find the value of the short-circuit current, isc, and Thévenin resistance, Rt. isc being the current that would flow through the two open nodes if they were shorted. The...

find the thevenin equivalent circuit (just need my values checked!) Homework Statement find the thevenin equivalent circuit (using open/short circuit method is how i did it): Homework Equations n/aThe Attempt at a Solution I just need to verify that my V(th)=V(oc) value is right: Vc/4 +...

Homework Statement https://www.circuitlab.com/editor/#?id=wt59bd Homework Equations ohms law The Attempt at a Solution Ok, from what I understand about this circuit, I can: eliminate R1 (resistors in parallel with a voltage source don't effect voltage), and eliminate R3...

Homework Statement Homework Equations a load resistor = 25ohm connecting A and BThe Attempt at a Solution trying to find V(th) first...any help would be appreciated. Mesh 1: 14I1-10I2-4I3=19 Mesh 2: -10I1+35I2-20I3=0 Supermesh: -4I1-20I2+24I3+8I4=0 Aux. 1: I(x)=I1-I2 Aux. 2: 2I(x)=I4-I3

Homework Statement http://imageshack.us/a/img14/2387/homeworktest2prob2.jpg a. Find the Thevenin equivalent circuit with respect to terminals a, B for the circuit. b. Find also the Norton equivalent circuit with respect to the terminals A, B, for the circuit Homework Equations V = IR...

Homework Statement http://imageshack.us/a/img809/9307/homeworkprobsg210omgthi.jpg Find the Thevenin equivalent circuit with respect to the terminals. Homework Equations V = IR, KVL, KCL voltage division, current division Thevenin formula / procedure The Attempt...

Hello guys! It's been a while since I last had to deal with direct current and I'm having a hard time solving the equivalent resistance for a simple circuit. I know this is rather simple, but I can't find my notes, so, could you please help me? The photo of the circuit is attached...

Homework Statement Two objects are identical and small enough that their sizes can be ignored relative to the distance between them, which is 0.3 m. In a vacuum, each object carries a different charge, and they attract each other with a force of 2.3 N. The objects are brought into contact, so...

Homework Statement Calculate the equivalence capacitance of the network; where C1 = 8.55 μF, C2 = 4.00μF , C3 = 8.65 μF, C4 = 3.20 μF http://imageshack.us/content_round.php?page=done&l=img822/4296/loncapa.gifHomework Equations Capacitane in parallel: C = C1 + C2 + ... Cn...

Homework Statement Find Thevenin equivalent circuit as seen across terminals A and B for each circuit. Homework Equations V=IR The Attempt at a Solution Those resistors are in parallel because not all of the current going through the top one is going to go through the next one...

Homework Statement Use the circuit shown to answer the following questions. At time t = 0 the switch in the circuit is closed. Answer the following questions after the switch in the circuit is closed. What is the equivalent resistance of the circuit given R1 = 5 , R2 = 5 , R3 = 4 , R4 =...

Homework Statement I had this posted under a different question a while back and didn't get any responses, so I thought I'd rephrase it. I've reduced it to what I think I'm supposed to show. (Here's the old post: https://www.physicsforums.com/showthread.php?p=4260206#post4260206 ...

"closed electron configuration" equivalent to "closed shell" Hi, is the term "closed electron configuration" equivalent to "closed shell"? derivator

I'm given the circuit in the attached image (I just quickly re-created the circuit in LTSpice to save on drawing time). In the first part of the question I managed to find the S domain transfer function without any issue. I found the transfer function as some function of the resistors...

Homework Statement for n \in N, n \geq 1 Prove that (n^{3} +2n)Z + (n^{4}+3n^{2}+1)Z= Z Homework Equations I know subgroups of Z are of the form aZ for some a in Z and also that aZ+bZ= dZ, where d=gcd(a,b) The Attempt at a Solution So I was thinking if I could prove that the gcd...

Hi, this is rather short one. I'm wondering if the two in the image below are equivalent. http://gyazo.com/62449de717e91b412f42771fd7d0a1af To me they appear to be equivalent, and I can't recognize any exceptions or trivial cases. Also, if it is equivalent would be it be acceptable to...

Homework Statement How much force is exerted when an individual leg presses 68 kg twelve times in 24 seconds? The leg press machine is a horizontal press machine. Distance pressed forward 14 inches 2 seconds forward followed by 2 seconds reversed for each rep was held constant...

Homework Statement http://session.masteringengineering.com/problemAsset/1515645/4/Steif.ch02.p28.jpg Find the equivalent resistance between node A and B, knowing that Rab = Vab/Iab Homework Equations KCL and KVL, I know. The Attempt at a Solution There is nothing in series or...

Homework Statement Determine the equivalent capacitance of the combination shown in Figure P26.75. Suggestion: Consider the symmetry involved. Homework Equations Parallel is: C1+C2+C3+... Series is: (C1^-1 + C2^-1 + C3^-1 + ...)^-1 q = CV The Attempt at a Solution I have no...

Hi, Does anyone know of a simulator where I can make a circuit and the simulator tells me the equivalent resistance? I need one that will allow me to put resistors in parallel, series, del to y etc.. I can't find one or know of a way just confirming that my original calculations of the...

http://img7.imageshack.us/img7/6238/capturealh.png My gut tells me that these resistors are in parallel. However something tells me that it might be more complicated but I'm not sure. Do I find the equivalent resistance by just simply adding them together as if they were in parallel to...

See attachment for the question. ---------------- ∀x ∈ D, if P(x) then Q(x). this means ∀x P(x) -> Q(x). all you have to do is find a value for x ∀x this means for ALL x right so you can choose ANY element but for the E its only things in the domain so all you have to do is choose an x...

Hello friends, I would like to know the equivalent expression/function for Ln(1+ax), where 'a' is constant. I am not interested in series expansion, I would like to know whether it can be written in terms of sum of other simple terms/functions ( It can be trigonometric, hyperbolic...

At MMF, I have used a $\LaTeX$ command (\cancel{put factor here}) to denote the "canceling" of factors in the numerator and denominator of a rational expression for further clarity when simplifying, and I have noticed this command is not supported here. In fact, of the 4 forums on which I...

Can one tell me about the Mathematical Equivalent to Landau & Lifgarbagez. or any other set that deal with all Graduate Level Mathematics. There is a Series by Springer, Springer Graduate Texts in Mathematics but they contains too many books. It would be great if they contain Max. 20 books...

1.What is the equivalent resistance between A and B? (The diagonals do not intersect) 2.equations: I don't think I can provide any equation u don't know... Then again my last 2 posts were deleted... so no mistake this time... :D Rs=R1+R2+... 1/Rp=1/R1+1/R2+... concept of voltage,current etc...

Hi guys,I'm new here and maybe I'm posting this homework in a wrong part of the forum.I tried to find the equivalent resistance.It may be a simple homework but I am learning first for the electricy physic.I tried to find Re first R2+R3=4 Ω and than found Re=1/4 Ω + 1/2 Ω + 1/2 Ω can i slove it...

I have a question on something that has come up many times for me in other contexts, such as Lipschitz transforms, and recently contraction mappings and the fixed point theorem. Is the following statement always false, and why? Let x and y be two positive real numbers. \exists k<1 \,\...

Hi, The Gilmore equation is associated with bubbles in gas. When equated to a mass-spring system, you get the following results. m_{effective}=4\pi R_{0}\rho So the effective mass is given by the liquid volume that the bubble occupies. This is easy for me to see as it's effectively the...

I am quite confused about this area. First entropy does not contain any reference to volume. So if we can theoretically set the entropy of A and B gas samples as the same but in different volumes. If A is in a larger volume it would be able to exhibit a larger number of microstates? Yet the...

Hi, can anyone help me on how to find Thevenin equivalent resistances for a Wheatstone bridge configuration? I've searched all over google and youtube, but I haven't been able to fully understand the procedures.

Does putting the concept of acceleration in SR make it equivalent to GR? I see a lot of sources (including many posts in this forum) which seem to say that SR can handle acceleration fine, but not gravity. However, an acceleration IS gravity by the equivalence principle, so what's the...

Another one.. I'm sorry but I will likely spend tomorrow and today here with you guys asking for help and mooching solutions. Same deal, badly explained unit. We spent 15 minutes on this. Attached questions as jpg... Homework Statement How do I find total equivalent resistance? What does...

two simple questions about equivalent resistance and kirchhoff laws! pleaseeeee! :D EQUIVALENT RESISTANCE: Hi everybody . greetings from Peru.I know it's a dumb question but help please .please read below Homework Statement For the network shown in the figure, show that the resistance Rab =...

Hi guys, I have a question that is nagging me quite a lot. Let us say that we have a circuit who has two independent sources (any combination of voltage and current sources). In the determination of Vth, can we choose whether or not to use superposition to find this Vth? Because my...

Hello, You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line. Is there a way to visually test if 2 discrete variables are from the same distribution? Also is there a way to test it mathematically? Thanks

Homework Statement Question Homework Equations The Attempt at a Solution I tried using source transformation. I simplified the original circuit to the above circuit. I got Rnorton, however, I am a bit unsure on getting Isc. Is it possible to source transform the above circuit further? Or...

Homework Statement Alright so I am having trouble finding the equivalent resistance of something like this Without "hooking it up" to a current source and solving a large system of equations to find the voltage drop across the network and therefore the resistance. Is there a faster...