Rules Definition and 502 Threads

I'd like to know if Kirchhoff's laws of voltage and current are valid in circuit with alternate current. If I'm not wrong, in such circuits, the E field provided by the emf is varying with time. And I've heard that Kirchhoff's laws are a special case of Faraday's law of induction but with a...

String theory requires 9 spatial dimensions, M-theory 10. One followup to Verlinde's paper is this: http://arxiv.org/abs/1002.0488 Hidden symmetries for thermodynamics and emergence of relativity Liu Zhao (Submitted on 2 Feb 2010) Verlinde recently proposed an idea about the thermodynamic...

Find currents , , and given the following values of resistances in the circuit: = 2.00 , = 3.00 , = 1.00 , = 4.00 , and = 10.0 . Enter your answers in amperes, separated by commas.

How does one deal with a delta squared ? For example, volume is a function of del Diameter and del Length. If i let v = d^2(pi)L/4, and then call the d and L del. d and del L, when i separate for d i get del d^2 So I'm wondering if there are any special rules for squaring a "del"

Homework Statement Calculate ground state of erbium [Xe] 4f^12 6s^2 The Attempt at a Solution so i know that the f orbital can hold 14 electrons and has 7 types of orbitals that is -3,-2,-1,0,1,2,3 So i constructed a table with axes of m_l (-3 to +3 above) and m_s. Then hunds rules...

True or False, with a proof or counterexample. a) If bn ≠ 0 and an/bn →1, then an-bn → 0 b) If bn ≠ 0, bn is bounded and an/bn → 1 then an-bn → 0 At the moment I cannot even see which is false so I am struggling with this question. I think the proof will require use of the quotient...

http://img51.imageshack.us/img51/659/car.gif Not intended as a political statement.

Homework Statement Find the average value of the function f(t) = (t-3)^2 on [0,6] Homework Equations Average value equation (see below) The Attempt at a Solution Okay, I have this: http://img4.imageshack.us/img4/5338/howthecrap.png But I don't know how it gets to the last...

Homework Statement Sorry for edit, accidentally posted. Circuit is show in my attachment. I have 3 loops with three unknown currents. 8 Ohms of resistance down the left side. 6 Ohms of resistance and a 4V battery down the center. 4 Ohms of resistance and a 12V battery down the right side. I...

The transition in the n=2 state of Helium from 3P1 (m=0) to 3S1 (m=0) is forbidden. I know this, because I went to a lecture where a group measured the fine structure constant very precisely using this fact. However, as far as I can see, according to atomic selection rules (available here...

I am reading some online article on Zeeman effect http://math.ucr.edu/home/baez/spin/node10.html In the article, the author mentions 4 selection rules, I wonder the corresponding transition is allowed by satisfying one of these selection rules or the corresponding line will be allowed only...

Homework Statement Hello all, thanks for reading... I was assigned to calculate feynman rules for the scalar QED theory via functional methods. The fields are a scalar complex field \phi, \phi^* and gauge field A_\mu, and the lagrangean is \mathfrak{L} = (D_\mu \phi)^* (D^\mu \phi) - m^2...

I have these two circuits with permanent rule: a) b) I'm asked to find: For a): the charges of each capacitor (C = 1 \muF)and the currents in each resistance. For b): the currents in each branch with the L switch on and off, the difference of potential between A and C, A and B and C...

Use the cosine and sine rules to determine the magnitude and direction of the resultant of a force of 11 kN acting at an angle of 50 degrees to the horizontal and a force of 6 kN acting at an angle of -30 degrees to the horizontal. helppp please

1. Suppose the curve f(x)=(x^4)+a(x^3)+b(x^2)+cx+d has tangent line when x=0 with equation y=2x+1, and a tangent line when x=1 with equation y=2-3x. Find a,b,c,d 2. d/dx f(x)g(x)=g*f`+f*g` 3. f`(x)=4x^3+3ax^2+2bx+c x=0 y=2x+1 y=1 (0,1) is a point on f(x) x=1 y=2x-3 y=-1 (1,-1) is a point on...

Homework Statement I am trying to calculate the currents on this 2 power source circuit using Kirchoff's Rules. http://img101.imageshack.us/img101/4151/kirchoffc1.jpg Ignore the numbers on the lines connecting the components and their length Homework Equations I#1=I#2+I#3...

Homework Statement I am supposed to find the first and second order derivative of p=\left(\frac{q^{2}+3}{12q}\right)\left(\frac{q^{4}-1}{q^{3}}\right) Homework Equations Derivation Sum and Difference as well as Product and Quotient Rules The Attempt at a Solution I tried to cross...

Homework Statement Regarding the identity Ax(BxC) Homework Equations Does this identity only hold when A != B != C?

Hi everybody, I'm new. I'm approaching to QFT in these months and I have a couple of questions about Feynman rules. The most of the books I have read (or tried to) explain feynman rules telling what you have to do when you have an internal or external line in a graph, and when you have a...

Breaking rules of Algebra? Homework Statement I am copying this problem from my textbook. It is about momentum and Kinetic energy The Attempt at a Solution My problem lies in part B. According to Part A, [SIZE="5"]v₁'=v₁‐kv₂' But in part B, [SIZE="5"](v₁‐kv₂')²+kv₂'²=v₁'², see...

proof for the differential log rule proof for the integral log rule please and thankyou

Is Geography a science? It is comprised of theories, Laws (well Rules realy), hypothesis, some Math equations, aspects of Physics Chemistry and Biology. Also there is still much to be learned from it.

I'm finding a lot of inconsistency with the solubility rules from different sources. especially when it comes to SO4(negative 2 charge). my teacher told me: soluble except when combined with Ca2+, Ba2+, Sr2+, Pb2+... however, other sources sometimes include Hg(II) 2+, and some Ag+, and...

Homework Statement In the circuit of Figure P28.28, determine the current in each resistor and the potential difference across the 200-ohm resistor. Homework Equations Kirchoff's Rules V=IR The Attempt at a Solution The way I did it was like this: I set up a system of...

Homework Statement (p -> q) has an unambiguous meaning both in logic and in natural language. The DeMorgans laws tell us what is meant by the negation of a conjunction or the negation of a disjunction, but what is the negation of a conditional such as p -> q? Use the rules of logic to produce...

I'm reading a course in Introduction to QFT and I'm stuck at a problem. I'm hoping someone here could point me in the right direction or say if my assumptions are incorrect. Homework Statement Derive the Feynman rules and all diagrams at tree-level for \lambda \phi^3 theory using Wick's...

Homework Statement (a) Determine the currents I1, I2, I3 in the figure. Assume the internal resistance of each batter is r = 1.0 olms (b) What is the terminal voltage of the 6.0 V battery? I hope you can read my handwriting. Homework Equations V = IR The Attempt at a...

Homework Statement Using Kirchhoff's rules, find the currents I1, I2, and I3 in the circuit shown where R1 = 8.0 ohms, R2 = 9.0 ohms, and R3 = 5.0 ohms. Homework Equations Loop law, Junction lawThe Attempt at a Solution I know how to work the formulas, but the picture is really confusing. The...

I'm trying to work out the correct algorithm for using Kirchoff's rules when using a non-ohmic resistor like a light bulb. The problem is that the resistance depends on the voltage, but the voltage may depend on the resistance (a simple example: a bulb and a resistor in series: how should the...

I'm learning QFT by reading Lewis Ryder's book, so my question in short is: how he arrives at Eq 7.57 and Eq 7.58? If you don't have the book, the question is: why are there Minkowski metric terms in the Feynman rules for a gauge field coupling to itself? If the answer is complicated, simply...

boolean equation = A̅D + AB̅C̅D = D (A̅ + AB̅C̅) * rule A + A̅B = AB ? = A̅D + B̅C̅D am i using the rule correct or does A̅ + A make it a 1 and answer D(1)

I'm not sure if this is the right place to post a graduate level course material, but I have a question about perturbative expansion of the 2n-point function of a scalar field theory. Homework Statement First, the question: In which space (position or momentum) is the topological distinctness...

The Born rule says that if a system is prepared in state |a>, and a measurement of an observable Q is performed, the probability that the result is qi is P(q_i)=|\langle q_i|a\rangle|^2 The ABL rule (Aharonov, Bergmann, Lebowitz) says that if a system is prepared in state |a>, and a...

Homework Statement In an ABC toy theory, the only allowed vertex is one that couples A, B and C. Thus there are no AAA, ABB, ACC...ect vertices allowed. My question is suppose a diagram has na external A lines, nb external B lines, and nc external C lines. Develop a simple criterion for...

This is so wrong, IMO. http://news.yahoo.com/s/ap/20081120/ap_ca/bush_endangered_species

A standard definition of energy is the ability to do work. Work is defined as the movement of matter through the application of force (measured in Newtons). Yet in the Standard Model of particle physics, various bosons represent "energy particles" that are the intermediaries for each of the...

Does anyone have a straightforward link to linearity rules? My textbook is not very helpful and my prof never knows what he is talking about :(. I have a few "prove this is not linear" questions to do f(x)=(|x1|,|x2|) f(x)=(1,2)+3x f(x)=(0,1) I should know this, but i tend to forget the...

What changes to the algebraic rules when imaginary "i" is introduced in addition to real numbers? I know that complex numbers do not have a "<" or ">" relation. Some functions become multivalued. What about school algebra? Maybe exponentiation rules are slightly modified?

Homework Statement What is the IUPAC name for the following compound. (Benzene with two chlorines sticking out one at Carbon 2 the other at Carbon 5) Homework Equations The Attempt at a Solution I understand that the compound's name has to be something like 2,5-dichlorobenzene but...

Hi. I know that for real numbers log(z)=-log(1/z) is this also true in general for complex numbers?

Homework Statement a house plan has 3 different floor plans: Plan A- 3 three-bedroom units, 7 two-bedroom units, and 8 one-bedroom units Plan B- 4 three- bedroom units, 4 two-bedroom units, and 8 one-bedroom units Plan C- 5 three-bedroom units, 3 two-bedroom units, and 9 one bedroom units...

Mathematical Derivation of Significant Figure "Rules" Let's say I have a scale which can accurately read weights out to ten-thousandths of a gram so it might read 1.0005 g or 0.0005 grams ... why is it that the first reading has 5 significant figures and the second has only 1? Same instrument...

Homework Statement Find the ground state of nitrogen in the form (2s+1)(L)(J), where s represents the total spin, L represents the total orbital angular momentum (s,p,d,f), and J represents the total angular momentum. Attempt at solution Well, the electron configuration is [He](2s)^2...

The question: Suppose point A is grounded (V = 0) in Figure 21-36, in which script e = 16 V and R = 11 . Find the potential at points B and C. Here is the diagram: http://www.webassign.net/walker/21-35alt.gif I'm pretty sure that I have to use Kirchhoff's rules in order to solve this problem...

Pls point out me every body. I wish to know why does the magnetic field and current are perpendicular to each other? Or is it natural phenomena?

This is not a homework problem, but advice on the presented examples would be helpful anyways. Does anyone know of a good QM textbook or website that discusses the rules for applying derivatives in QM? In reviewing many of the derivations, I find many weird applications with no reasoning from...

Homework Statement http://www.cramster.com/Answer-Board/Image/20073231626286331026398833900007956.jpg This is not problem. I just having trouble understanding the basics. Please just tell me right away, don't 'assist!' I trying to understand the right hand rule. Here are to...

Homework Statement Determine the current in each branch of the circuit shown in Figure P28.19 (attached) Homework Equations Kirchoff's Rules: \Sigma I_{in} = \Sigma I_{out} \Sigma \Delta V = 0 The Attempt at a Solution I have no idea where to begin. It's in the Kirchoff's...

in peskin-schroeder and http://www.hep.phy.cam.ac.uk/batley/particles/handout_04.pdf" the amplitude for e^-e^+\rightarrow \mu^- \mu^+ is written using feynman rules as follows -iM=[\bar{v}(p_2)(-ie\gamma^\mu )u(p_1)] \frac{-ig_{\mu\nu}}{q^2}[\bar{u}(k_1)(-ie\gamma^\nu )v(k_2)] but what...

Homework Statement Find the eq. constant for the reaction CH3COOH (aq) + NO2- (aq) = CH3COO- (aq) + HNO2 (aq) The Attempt at a Solution I find Ka for the reaction CH3COOH = CH3COO- + H+ and Kb for the reaction NO2- + H+ = HNO2 But what are the rules then? I try multiplying the...