Couple Definition and 423 Threads

Dear Physics Forum, I read this on a wikipedia site "Technically, QCD is a gauge theory with SU(3) gauge symmetry. Quarks are introduced as spinor fields in Nf flavors, each in the fundamental representation (triplet, denoted 3) of the color gauge group, SU(3). The gluons are vector fields...

They say that electrons move from the higher potential to the lower potential. For example, in this situation. Q1 and Q2 are negative charges and Q3 is positive. But, the equipotential is lower on the Q1 and Q2, so by definition of potential difference, the electron would go from the...

(Forgive the long title of this thread, but I was reminded to be descriptive with the title. Hope that's ok now...) Anyway, may question: Are there any speculations or even explanations why weaker forces couple to increasingly more particles? 1. strong force only couples to hadrons and gluons...

First question: The near point, or neatest point at which an object can be seen clearly, for one of your eye is 100cm. You wish to see your friend's face clearly when she stands 50cm in front of you. If you use a tact lens to adjust your eyesight, what must be the radius of curvature and power...

Homework Statement Hey guys, I have two separate questions. 1.) I am asked for a unit vector pointing from P = (1,2) to Q = (4,6) In physics, every vector I've ever worked with started at the origin, so these feel weird. I initially thought that it would simply be 3i + 4j, the...

I'm on here because I need help with my physics homework, but I"m not searching for answers. Currently I"m taking physics 201 at Midlands Technical College in SC, and we're using Physics: Principles with Applications by Douglas Giancoli 6th edition. My question regarding physics is, the word...

Homework Statement I attached the question as a picture to this threadHomework Equations M=FdThe Attempt at a Solution I was taught that the moment produced by two equal but opposite forces is the magnitude of one force multiplied by the distance between the two forces. I used Pythagoras to...

Homework Statement The forces shown in the Figure below form a couple. Replace the couple shown with an equivalent couple acting at points A and B. Please see figure Homework Equations Couple force moment equation is M = Fd (take only one of the two force vectors and distance between...

I got my old tests back today. And I don't understand what i did wrong?? p.s. teacher is not available at the moment( sub//part time teacher). 1. How much memory does it take to hold a 512x512 color image with 256 different levels of color(states)?? Okay, this one I just guessed and...

1.If you have a vector field F = <-y,x>/(x^2 + y^2) is that the same thing as saying: F = < -y/(x^2+y^2), x/(x^2 + y^2)>? That's basically saying that the function 1/(x^2 + y^2) is a scalar. 2.How do you show that vector fields are not conservative for certain values? Ex: F =...

I'm writing a paper on a propulsion device and I could use some F/P ratio comparisons, like typical values for Newtons per Watt for propeller driven, jet driven, and rocket driven craft. Also I ran into a confusing point involving work and kinetic energy. if kinetic energy is 1/2 m v^2, then...

Homework Statement A magnet is hung by a string and then placed near a wire as shown. When the switch is closed, the magnet rotates such that the ends of the magnet move as indicated by the arrows. At the instant the switch is closed determine: a) the direction of the current through the...

Alright guys, I’ve been reading quite a bit about quantum mechanics lately (purely qualitative) and I have a couple of questions about it all, any help would be greatly Appreciated! De Broglie Wavelength/schrondiger equation. Ok, so I’ve heard the ‘Wave nature of patricles’ explained in...

I have one hollow core fiber, the core is around 20um, Numerical Aperture is 0.03. The spot size of Ti:Sapphire laser is around 2~2.5mm. So I used focal length 50mm. But only very few power can be achieved (6uw). I wonder the reason. Could someone please give me some suggestions?

Say, I want to couple the angular momenta of a electron spin angular momentum, and a photon's momentum. I guess in terms of representations it's: SU(2) \otimes [U(1) \oplus U(1)] = [SU(2) \otimes U(1)] \oplus [SU(2) \otimes U(1)] But I'm not at all certain if this is correct, one thing for...

When I was in high school and first learned about the laws of thermodynamics, I independently postulated the heat death of the universe (of course I didn't know it was called that at the time). A few years later and I find out that some guys in the 1800s beat me to it. What do you think...

I hope this has not already been posted. If not, then enjoy. A husband and wife are in the middle of a long rode trip. They run out of gas miles away from any gas station, so the husband leaves his wife in the car with the windows rolled up and the doors locked, and heads off to find the...

Because our creek moves a great deal of rock, I've been meaning to work it with a metal detector during the summer months when it's dry, for a long time now. It seems likely that a meteorite would get deposited on the property during heavy flows, from time to time. A friend finally loaned me his...

Homework Statement In the protocol for the bradford method I am told to prepare two blanks of water of .15M NaCl. I don't understand why I need two of them. Don't I just need one of them for placing into the photometer after I have set 0% transmission to set 100% transmission by. should...

Homework Statement How to couple spin angular momenta of four electrons? 2. The attempt at a solution I've no idea. I've learned coupling of two angular momenta and Clebsch Gordan coefficient. But donno how to appy that to this system.

Please see uploaded image... So the question is, what is Hg(dot) ? so I know that I need w1 in rad/sec, so 1800*(2(pi)/60)=188 rad/sec I want to establish a set of moving axes at the center of the rotating disk on the saw that is parallel to the stationary axis. My w is then...

Homework Statement I already know the answers because this is a review sheet, but I don't understand how to solve number 1, and I don't understand the wording of number 2. 1) A particle is moving along the x-axis and has a position given by x=(24t-2.0t3)m, where t is in seconds. How far is...

Hello everyone, i am new to this forum so please excuse me if i haven't found the search function. o.k., i am struggling with the following problems. i really don't have cash to get a tutor so i am hoping some of y'all can help a brother out. i am not sure what formulas to use and why. They...

I'm studying a perturbation theory (behaviour of its series) and have found two articles which might be of particular interest. Unfortunately, all my three institutions do not have subscription to these journals (articles are too old). I'm kindly asking for your help. These are the articles I'm...

According to this video, a white deer couple from the 1950s rapidly multiplied and produced the world's largest population of white deer. How is that possible? https://www.youtube.com/watch?v=Z_TvkB1-XeE

I have three questions which I have to put into context, much of which is paraphrased from a book by Kerson Huang. In QED, the source of the gauge field (is the gauge field different from the vector potential?) is the current and charge density j, ρ. When a particle (electron) couples to...

I meant to put a homework question here but i figured it out after i posted it. But I have another question to help me in the future is there an easier way to write less than or equal to and greater than or equal to? also how do you delete posts?

How can a bride get all money of her husband in your culture ? Is it possiblethat he should hide his bank account or maybe he creates 2 accounts, one is let known and the other is not; after each payment he has got from work, he withdraws half then deposits it into the other account. Being a...

Are the 'moment of a force' and the 'moment of a couple' are technically same or different? Because, the latter is called by a special term 'torque'. Both terms are confusing, as the first is measured by the product of the force and its perpendicular distance from the fulcrum where as the...

I really need someone to tell me I'm wrong and why here or this is going to keep bothering me. As far as I'm aware, a thermocouple works by heating the same side of two different materials, one p-type and one n-type. Since charge carriers also serve to conduct thermal energy, the charge...

My physics knowledge is barely 101 so bare with me. However I've always wondered about gravity, just never took much time to look it up. I was hoping you could help me out a bit on it, perhaps give me some internet links to learning resources. Is there an equation to state (let's say an ideal...

Homework Statement I'm stuck on the following problems: I have to find the Laurent series around 1 of f(z)=\frac{z^{3}}{z^{2}-1} and the Laurent Series around 2 and on the annulus 1 < |z| < 2 of f(z)=\frac{z^{2}-2z+5}{(z-2)(z^{2}+1)} Homework Equations I am familiar with the geometric...

They went back four times to get more. Some bullets hit the boat. http://talkaboutequality.wordpress.com/2011/08/01/if-a-married-lesbian-couple-saves-40-teens-from-the-norway-massacre-and-no-one-writes-about-it-did-it-really-happen/ The source here is a translation from a Helsinki...

I can seem to get the answer of 60N and 125mm from C Thank you for the help

Edit - maybe I have the notaton figured out now and am just confused. Homework Statement The below relevant quotations come from Landau and Lifgarbagez, volume 7 : The theory of elasticity, chapter 1. 2. Relevant quotations Page 2: where uik is the strain tensor, dl is the original...

Hi there, I am on high school physics level and came here to have a few questions answered that keep boggling my mind and challenging my standards of logic... please keep explanations simple, since I don't have any extensive knowledge of QM and English is not native to me, thanks...

1. Why are the slits necessary? Do 2 individual light sources of the same frequency without slits or cards create an interference pattern? If not, why not? 2. How do different frequencies of light alter the interference patterns? Any links to experiments of this nature? 3. How about 2...

The Problem I've been given the beam shown below to carry out the Hardy Cross method (Moment Distribution) too. I have no problems with the method but I'm struggling with part b, which states "Replace column by an equivalent force and couple at point C"...

Hey guys, We skimmed a chapter on differential eqns in my semester 2 calculus class and we have a worksheet to fill out. I'm having trouble setting up the last 3 problems in this sheet. http://dl.dropbox.com/u/85600/DIFF_HW.PDF" I'm pretty sure It's all just algebraic manipulation to...

Hi, I have some brief questions I was hoping to get some help with: 1. Can any aspect of entanglement survive measurement? What I mean is, does the so-called collapse of the wave function in some sense delete any previous entanglements? 2. Does every event (particle interactions) result in...

Just a couple tricks which are obviously incorrect, but why? 6/2 = 3 (-2)^3 = -8 (A^B)^C = A^(BC) (-2)^3 = ((-2)^6)^(1/2) = (64)^(1/2) = 8 1/-1 = -1/1 sqrt(1/-1) = sqrt(-1/1) 1/i = i/1 And then multiply both sides by i 1 = -1 So what is happening here.

ive been trying to figure our this mechanics question and I am rather stuck but unfortunately i haven't had much experience with moments find the normal forces applied to the installed stud at points A and B l-----360mm--l--85-l A.==== P.=========== /==/...

I attended a seminar type thing at school regarding the path to graduate school and it was a wake up call of sorts. My eventual plan is to attend graduate school so of course anything I can do to help my application is good. I had or will have most of the requirements complete by the time I...

Calculate the force of attraction between a K+ and O2- ion whose centers are separated by a distance of 1.5nm I think you use this equation Ea= -(A/r) but I am not sure what A is

First, I am very confused as to the difference, if any, between head loss and pressure drop/loss. Can someone help me? Also, I know that the Darcy-Weisbach equation for head loss due to friction is hf=fL/D*V2/2g and you can plug that into get an equation for delta p that is dp=fL/D*pV2/2...

This is not really a homework question just a review but i wanted someone to explain to me why the forces of the moments negative on Fb, Fc and Fd thanks in advanced

Is the weak force responsible for all radioactive decay, or just beta? If it is also responsible for alpha and gamma, how does it work? If not, what causes the other two? (Also, related to this, I know that alpha radiation is two protons and two neutrons being expelled from the nucleus, and...

hey everyone, We're doing electric force and fields right now in our physics class. The trouble I'm having is with signs. I'm doing a prblem right now where I need to solve the magnitude and angle of electric force on one charge from a couple other charges and I don't know what sign to apply...

I do not understand the solution of this example. It says that in order to eliminate the last couple, we can apply the force F at another point C. But how do they move the force from O to C just like that?

I found some problems from old contests in my book and I need some help solving them since I could not find the solutions online. Some USA contest problems: 1.(1977.)Let a and b be 2 solutions of x^4+x^3-1=0 .Prove that a*b is the solution of x^6+x^4+x^3-x^2-1=0 2.(1983.).Prove that all...