Physical Definition and 1000 Threads

I'm playing with the PDE toolbox in Matlab and solving Laplace's equation, ∇2V = 0, for various electrostatic geometries. I say 'playing' because I started in the wrong end (or right end, depending on how you look at it) by simple trial and error until the solutions looked like something...

What is the implication of the fact that quantities like electric charge, color etc are conserved not just globally but in local region of space too? I understand the later is more restrictive but what advantage does it offer?

We are considering a stationary curved spacetime fabric. Temporal separation[Physical]is given by: {T}_{2}{-}{T}_{1}{=}{\int \sqrt {g}_{00}{dt} [Limits of integration extending from t1 to t2which are of course the coordinate times] The above integral is path dependent,in the general...

Does anyone have any experience with the military officer candidate school career path for physical scientists? I would like to put my physics B.S. to use, but I don't think I can get into a graduate program. I also don't want to join just to get shipped into a combat zone. What's it like?

Homework Statement A virtual memory system has a page size of 512 bytes, seven virtual pages, and four physical page frames. The page table is as follows: VPN...PFN 0.....2 1.....0 2.....- 3.....1 4.....3 5.....- 6.....- Note: VPN -> Virtual Page Number, PFN -> Page Frame Number...

My question relates to a specific example, namely the square root of two. If one forms a right isosceles triangle with the hypotenuse equal to 2 (be it metres, centimetres or whatever) then the other two sides must equal the square root of 2. But the square root of 2 is an irrational number. If...

Hello! I`m looking for Lagrangian Systems with Lagrangian function containing higher derivatives in t. I would be really happy if someone can tell some higher order Lagrangians with physical relevance. Thanks, Viktor

1. Homework Statement Ok So here's my question. The physical Pendulum consists of a thin rod of mass m = 100 g and length 80 cm, and a spherical bob of mass M = 500 g and radius R = 25 cm. There a pivot P at the top of the rod. (Sorry, I don't have a picture >.<) a) It asks for the center of...

Homework Statement Ok So here's my question. The physical Pendulum consists of a thin rod of mass m = 100 g and length 80 cm, and a spherical bob of mass M = 500 g and radius R = 25 cm. There a pivot P at the top of the rod. (Sorry, I don't have a picture >.<) a) It asks for the center of...

How do you compare physical pain with psychological pain? Which one is more intense and damaging? I think it's psychological. It's hard for others to comprehend unless they have been through it. But when someone sees blood they can imagine the pain. But when soul is wounded, it internal...

A physics student measures the period of a physical pendulum about one pivot point to be T. Then he finds another pivot point on the opposite side of the center of mass that gives the same period. The two points are separated by a distance L. Can he find the acceleration due to gravity, g...

Completing the Square for finding the general solution for a quadratic equation by using a two dimensional drawing is easy. Since we can not so easily draw a three dimensional figure to help in finding a solution to a cubic equation, has any clever mathematician ever found a three dimensional...

Hi all! I came across 2 questions on my course work, and i don't know what is required here, can some one help please? Q.1 Define the common derived units of the following physical quantities; and express them in terms of the base units: Mass, Length, Time and Electric charge (or Electric...

I have been reading that observations of distant quasars over the past decade have been suggesting that there have been minuscule changes in our physical constants. An estimate was given about 1 part per 100000 every billion years. If such a change is indeed happening, then it is safe to assume...

I want to take either a geology or physical geography class; I don't know which one I would enjoy more. If I take geology, it fulfills a prerequisite for another class I would like to take, Speleology; but the likelihood of me taking this class is unlikely. I have a general idea of the...

Homework Statement Calculate the vapour pressure of H2O(g) at 298K and an overall pressure of 1 atm., using the data provided. It cannot be assumed that dHvap and dSvap are independent of temperature. H2(g) dHcomb (298K) = -241.8kj/mol (H2(g) as a product)) Cp - 33.6 H2(g) dHcomb (298K) =...

What is the difference between the Algebra of Physical Space (APS) and the Spacetime Algebra (STA), and why do we need them both?

General particle motion in an FRW spacetime is governed by the geodesic equation, \frac{du^\mu}{ds} + \Gamma^\mu{}_{\nu \alpha} u^\nu u^\alpha=0, with u^\mu = \frac{dx^\mu}{ds} and where the Christoffel symbols are given in the notes. Show that the physical momentum of any particle always falls...

Homework Statement http://hyperphysics.phy-astr.gsu.edu/hbase/pendp.html#c2 i'm trying to prove to be Homework Equations Letting d = Lcm now we already know \partial^2\vartheta/\partial t^2 = \alpha = mgdT\vartheta / I I tried integrating the whole equation wrt dt so...

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) -...

Homework Statement The question is attached. Homework Equations -∆fS (T - T0) - (∆fCp/T0)[(T - T0)2/2] = 0 Please let me know if this doesn't make any sense! The Attempt at a Solution Given: Td: 39.3ºC = 312.45K ∆H: 157 kJ/mol = 152000 J/mol I calculated ∆S = -∆H/Td -----> ∆S = -486.48...

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?