Physical Definition and 1000 Threads

Homework Statement Show that the expression A, T(dP/dT)|V - P is equal to expression B, T^2 * [d(P/T)/dT]|V Also, show that expression C, -[d(P/T)/d(1/T)]|V is also equal to expression B Homework Equations A: temperature * (dPresure/dTemperature at constant volume) -...

I have some questions here regarding phase shift and scattering. 1). I am working out an exercise for my own benefit, for which I already have the solution, but there are parts of it I don't understand. I am given a scattering delta potential: b*delta(r - a), where b is a constant, and I am...

Is there a physical intrepretation of infinite series? Is there a picture that will explain what is meant by infinite series or is there a tangible application of this concept.

Homework Statement Two containers each contain 0.500 moles of N2 initially at 300. K. One container has a fixed volume, and the other container has a movable frictionless piston. If both containers are heated by 1000. J energy, calculate the final temperature of N2 for each container...

Hi everybody! I'd like to understand the physical meaning of the Feynman's vector potential definition: $ A_{m}^{(b)}(x) = e_b \int \delta (xb_{\mu}xb^{\mu})db_m(b), \qquad m=0,1,2,3 $ (component m of the vector potential of the particle b at the point x) Here - the integration is done over...

By 'equivalence', I mean of the computational kind -- i.e. in the same way any universal computer can emulate any other. First of all, hi there, I'm not sure I put this question in exactly the right forum, but it seems to me that most dualities currently being discussed fall under the...

Heh, I bet this product will do extremely well. It almost looks theraputic. https://www.buyeasyfeet.com/ My mother has some pretty serious physical disabilities. I'm going to send her one of these. In fact, I'll probably get one for Tsu and I to try as well.

Homework Statement Calculate the factor by which the volume and the diameter of a balloon would increase as it rose from sea level and 20 degrees celsius to the stratosphere at 40km. Homework Equations PV=nRT The Attempt at a Solution I don't think I have enough information to solve?

Homework Statement Use the maxwell Boltzmann distribution to derive an expression for <v^3> Homework Equations <v>=(8RT/piM)^1/2 The Attempt at a Solution I know that you have to integrate from 0 to infinity v^3p(v)dv.. but I don't really know how to integrate this. I just need to...

When comparing time and frequency domains, it is easy to imagine the meaning of the Fourier transform. In time domain, our function takes time as a parameter, and returns the value (result) of our process. When we make a Fourier transform of the same function, we take it to the frequency...

Thanks ahead of time for any help! Homework Statement From Atkins Physical Chemistry text, 9th Edition: 1.7b) The following data has been obtained for oxygen gas at 273.15 K. Calculate the best value of the gas constant R from them and the best value of the molar mass of O2 (oxygen). p(in...

Homework Statement At what temperature will isopropanol (Tbp = 82.5C) and carbon tetrachloride (Tbp = 76.7C) have the same vapour pressure? For isopropanol and carbon tetrachloride, the standard enthalpies of vaporization are 32.54 kJ mol-1 and 44.0 kJ mol-1, respectively. Homework...

in E = E_0exp i(k dot r - wt) or E = cos(k dot r - wt) what does k dot r physically represent? Can r be any position in space or must it lie on the wave? (I physically understand what a dot product is)

I've been trying to learn more about physical chemistry, especially since only after graduating did I realize how neat of a field it is. In my undergraduate program, we had a course in classical thermodynamics (we never reached statistical mechanics or kinetics), then there was a quantum...

I put off an assignment until the last minute and on the very last question it came back to bite me in the butt. I'm supposed to derive an equation from another equation, and the math is not working out for me. If there's anyone still up and reading this and that can point me in the right...

ıs anyone know about what the physical meaning of form factor is?

Homework Statement Cloud moves from alt. 2000m (P = 0.802atm) to 3500m (P = 0.602) when it encounters a mountain. It expands adiabatically. The initial temp is 288K, CP,m for the air is 28.86 J/Kmol (assume ideal). What is the final temp and will it drop it's moisture?The attempt at a solution...

I've been developing a hypothesis about how the physical reality must be like and work. The physical reality would be composed by a homogeneous existence that is made up by itself, that solely exists. This is how I defined space. The space has a finite and perfectly spherical shape that...

As the title suggests, what is work? Or, what is the physical significance of work? My textbook define work as crossproduct of force and displacement. But why do we need that quantity?

I assume that it comes as no shock that people have a rather wide range of preferences in physical features. This is to be the thread where we discuss that which we like and do not like in a human physique, male or female. Since I am a straight male my opinion here will be somewhat limited. I...

any recommendations to a physical chemistry book? I want to know which one is the easiest to understand, and covers all the material in detail.

Any suggestions on how to go about becoming a researcher in this area? I have very little formal background in math and physics and will be studying this on my spare time (which means when I'm not working on the cognitive stuff, though I would love to integrate something more rigorous into...

Hi! I have a question about time. I don't understand why everyone thinks of a time as some coordinate like x,y,z. I don't get it. From my point of view the time as some physical quantity doesn't exist. Because there is only moving matter. And we can talk about time by observing changes in...

I want to know what orthonormal basis or transformation physically means. Can anyone please explain me with a practical example? I prefer examples as to where it is put to use practically rather than examples with just numbers..

i do not understand what is the physical significance of wavenumber. i have a plot with wavenumber on x-axis and count on the y axis. what does the plot mean, how can i relate to a practical example. please help

Are you satisfied with your current weight and level of fitness? If so, what do you do to maintain it? If not, why do you think you have fallen from it (assuming you were once there)?

Now I'm undergrad student, majoring in Physics. But I think I prefer to be a physical chemist and want to be a university lecturer in department of chemistry. My research field is molecular biophysics and I need to have a basic knowledge of organic chemistry and biochemistry, but now I'm...

as we know whole Quantum mechanics is based on Schrondinger Equation, but how for a wave we can physically vizualize/interprete this eq. in the context of wave function?

I'm just having a difficult time trying to differentiate between variables used and terms thrown around in PChem. :confused: First of all, what is the difference between "bond energy" and "bond dissociation energy" in a Morse potential curve? I thought they were interchangeable. Also, does...

hey, i am trying to find what is the process going on in the conductor while conducting ac. what is happening to electrons? what is the physical meaning of negative voltage in sin curve?

hi, I am a novice to quantum mechanics and get a lot of troubles with operators. I cannot explain why: - why QM uses operators for observables such as position, momentum, energy, ..ect, but classical physics does not? - what are physical interpretations of operators? - why are operators needed...

Homework Statement What physical and chemical changes occur when a wax candle burns? Homework Equations The Attempt at a Solution

We know the the generalized momentum is P=mu + qA Can someone explain to me, what's the physical meaning of the quantity 'qA'? The particle's momentum that we measure is just 'mu', right?

1. A square object of mass m is constructed of four identical uniform thin sticks, each of length L, attached together. This object is hung on a hook at its upper corner. If it is rotated slightly and then released, at what frequency will it swing back and forth? Homework Equations...

physical pendulum--thin rod Why do you have to divide the length L by 2 in these cases? The explanation that's provided in my book says "the distance L between the pivot and the center of gravity is .5 the length L." This makes no sense whatsoever. The length should be the same regardless of...

I, as with Albert Einstein, shall always side with Issac Newton; that is to say, that light is corpuscular. There is no such thing as a light 'wave'. Sure, Thomas Young threw the world of physics a curveball in 1802, backed by Huygens and his somewhat sound reasoning (for the time). But who...

Hello. Today I came across a physical phenomenon .. I played badminton in France, at the swimming pool. So I lost my paddle in the pool. (A badminton racket looks like a tennis racket) In the water, no matter how I throw the racket down, balancing it on the head in the bottom of the pool...

in the nodal analysis -one of ways of analysis DC circuit - i couldn't understand the physical roots of this way . i mean how could i make the voltage of a node equal to zero by make it as a reference point without having any effects on the voltage(electric potential) of the rest nodes ...

My understanding of how AC current works is that the current changes direction, so essentially the charges are oscillating back and forth along the direction of the cable. Then since accelerating charges radiate, this produces an EM wave which is what carries the energy. But my problem is...

I just finished my first Linear Algebra class and loved it. There is one thing we didn't go over much though. What exactly IS a determinate? Is there a physical interpretation? Or is it just an operator that has these special properties? Thanks! ~Matt

What would happen to the universe if the physical constant of Big G was changed?

http://www.cbsnews.com/stories/2010/06/10/60minutes/main6568387.shtml?tag=contentMain;contentBody" https://www.youtube.com/watch?v=<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/FZUzB8uC9bs&hl=en_US&fs=1&"></param><param name="allowFullScreen"...

I was wondering whether any members of this PF sub-forum would help me towards some physical interpretation of Maxwell’s time-dependent equations, which must ultimately underpin any classical description of EM wave propagation. I know that some might simply suggest reading a good textbook, but I...

Ya know, rare Earth magnets and crap like that. Anybody know of some other cool things to have sitting around the house?

Hey guys! When I was on a trip in Cambridge I took a picture of the famous apple tree, that is supposed (so the turist office claims:-p) to be the one, where Isaac Newton got the idea for his most importaint work. In the back there are two windows and one of them (I think it's the right one)...

I wanted to hear suggestions for the...roughly...5 most essential physical problems that a serious working physicist should understand how to solve. Like the conceptual goals for someone who is just getting into the center of my study of physics (headed towards graduate school in a year.) Thanks...

Homework Statement Compute the \mu=0 component of the Minkowski force law K^\mu=q\eta_\nu F^{\mu\nu}. (Einstien summation convention applies.) Homework Equations \eta_\nu=\frac{1}{\sqrt{1-u^2/c^2}}(-c,u_x,u_y,u_z) F^{\mu\nu} is the field tensor where...

I am required to simulate the propagation of a the wavefront produced by a laser light (about 633 nm) passing through a system of lens and undergoes a few reflection. What I did at the moment is to do ray tracing, record the optical path length of each ray, then connect every point of the same...

Homework Statement Ok worked out the time period of a physical pendulum (T) to be (in terms of constant a, and variable length x): T^2 = 4pi (1/2a^2 + x^2)/(gx) Now asked how i could use a measurement of T(x) to measure g. Homework Equations The Attempt at a Solution I...

Hello. I am making a small induction motor and have been wondering about it's limits. I have googled a lot and can't find a helpful answer. Is there a maximum length of coil that a magnetic flux of specific strength can excite ? Thank you, Gary.