Equivalent Definition and 1000 Threads

  1. B

    Do photons warp space like the equivalent energy as mass would?

    I understand that in GR mass is considered a distorting of space-time. If you had a teleporter which transmitted an object's energy perfectly as photons to be reconfigured at a perfect reciever at the destination location, whilst in transit as a (very high energy) light pulse, would the same...
  2. A

    Engineering Finding equivalent impedience Zeq of circuit

    Homework Statement Homework Equations w = 10^5 rad/s Z(L)= jwL Z(C) = -j/wC Z(eq)= ?? Zeq(rectangular form) = a+jb Zeq(polar form)= p<(theta) p = sqrt(a^2 + b^2) theta = arctan(b/a) The Attempt at a Solution i calculated the impedences across the inductor/resistors: across 0.5uF capacitor...
  3. H

    How to calculate thevenin's equivalent resistance

    when i short the batteries to find the rth, i can't get whether is should put delta to star transformation to find thevenines resistance? can some one tell me how to calculate thevenines equivalent resistance in the figure shown... step by step
  4. J

    Kirchoff's Rule(How do I find equivalent resistance?)

    Homework Statement Please take a look at the attachment to see the circuit. My question is how do I find the equivalent resistance of this circuit? I have done the other two parts but this part has got me stumped. I also drew my currents on the picture. Homework Equations The...
  5. T

    Help understanding equivalent definitions for continuity

    I was hoping someone could help me understand the equivalence between the definitions for functions to be continuous between topological spaces, ie: For X and Y topological spaces, and f:X-->Y a function, my notes don't prove why these definitions are equivalent (possibly because I'm missing...
  6. D

    Solving Equivalent Circuit for Thevenin Resistance & Current

    Homework Statement For t<0, the circuit shown below with the voltage source at 11 volts and three resistors combined into an equivalent, Req. We need to find the Thevenin equivalent circuit for the part of the circuit connected to the inductor. First find Req, by combining series and...
  7. E

    Need help finding an equivalent spring constant

    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...
  8. N

    Equivalent Capacitance for 4 capacitors of same capacitance

    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...
  9. M

    Find the equivalent capacitance

    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...
  10. M

    Help drawing equivalent resistor diagrams.

    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...
  11. N

    Why Are Symmetric & Non-Symmetric Matrices Not Unitarily Equivalent?

    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.
  12. S

    How is acceleration equivalent to rest in a gravitational field

    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...
  13. R

    Projectile Motion - Equivalent javelin throw performed on the moon

    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...
  14. R

    Creating Circuits with equivalent resistances

    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...
  15. A

    Theravin equivalent resistance/current little help

    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...
  16. phoenixthoth

    A statement equivalent to the definition of limits at infinity?

    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...
  17. M

    Circuit schematics: Equivalent Representations of circuits

    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...
  18. M

    Analyzing equivalent capacitance

    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...
  19. M

    Einstein coefficients/ equivalent phrase

    Hi Is it technically sound to state that the rate of absorption of photons at a given frequency is proportional to the number of photons at that frequency? most statements of the B coefficients seem to focus on molecular state populations, but I'm reasoning that for every state change n1--->n2...
  20. T

    Engineering Norton Equivalent Circuit: Find i(sc) and R(t)

    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...
  21. A

    Engineering Find the thevenin equivalent circuit (just need my values checked )

    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 +...
  22. K

    What is the Thevenin equivalent for this circuit?

    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...
  23. A

    Engineering Help finding Thevanin equivalent circuit

    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
  24. C

    Thevenin equivalent, (superposition?)

    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...
  25. C

    Engineering Find the Thevenin equivalent circuit:

    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...
  26. T

    Equivalent electrical resistance

    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...
  27. pmd28

    Equivalent Electri Force, Find the charge.

    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...
  28. B

    Calculate the equivalent capacitance in the network

    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...
  29. L

    Find Thevenin equivalent circuit

    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...
  30. T

    Equivalent Resistance (Prep for Lab on DC circuits)

    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 =...
  31. S

    Showing that the following are equivalent

    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 ...
  32. D

    Closed electron configuration equivalent to closed shell

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

    Engineering Finding Thevenin Equivalent Circuit

    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...
  34. G

    Proving a subgroup is equivalent to Z

    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...
  35. P

    Are the following two integrals equivalent? [basic]

    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...
  36. C

    How Do You Calculate Force in Biomechanical Movements?

    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...
  37. H

    Find equivalent resistance in this circuit

    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...
  38. M

    Equivalent Capacitance of Complex Circuit

    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...
  39. G

    Equivalent Resistance Simulator

    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...
  40. G

    What is the Ideal Current Source and How Does it Affect Circuit Design?

    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...
  41. P

    Discrete Math. (Logically equivalent)

    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...
  42. S

    Is there any equivalent for Ln(1+ax)?

    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...
  43. MarkFL

    MHB Is there an equivalent command to \cancel{} that I can use here?

    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...
  44. S

    Mathematics Equivalent to Landau & Lifshitz

    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...
  45. E

    What is the concept of equivalent resistance in electrical circuits?

    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...
  46. D

    What is the Equivalent Resistance in a Series Circuit?

    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...
  47. T

    Does x ≤ ky Imply x < y for k < 1 in Mathematical Analysis?

    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 \,\...
  48. E

    Mass-spring equivalent of microbubbles

    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...
  49. P

    Are the number of microstates of a gas just equivalent to pressure

    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...
  50. J

    Thevenin equivalent for wheatstone bridge

    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.
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