Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
 Views: 8,424 Announcement: Two free ways to get Gold Membership! Jan17-12 Meta Thread / Thread Starter Last Post Replies Views Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people... Apr22-11 06:26 AM ZapperZ 1 41,151 i want to know about the denisity of air and how does it exchange .... to use it in equation ....and the denisity of... Feb22-09 01:58 PM pallidin 2 825 Could someone explain the connection between density, pressure, and temperature in relation to the ideal gas law to... Jun18-11 07:02 PM my_wan 2 1,623 Question: Show that for a steady flow with div.u=0, the density is constant along streamlines. I just don't see... Jan29-11 05:20 PM jmz34 10 2,367 Let pressure equation of sound wave be \Deltap=Pocos(\omegat-kx), then what will be the density equation of the... Jan23-10 03:13 PM abhineetK 2 1,084 Should be a simple question really can not understand why I am not able to get my head around it though. Assume an... Jun1-09 11:16 AM ponjavic 0 1,338 I would like to know if density is exactly the same everywhere in a disk full of water except at one part where there... Oct30-13 05:30 AM Borek 3 342 what do the non-diagonal components of a density matrix tell us about the mixed state we are in? Apr17-10 09:25 AM Andy Resnick 1 775 I came across a formula that gives radiant energy density as 4 * sigma * T^4 / c. I am trying to figure out how this... Apr12-07 09:39 AM lpfr 1 1,800 How do I explain to my Engineer friends that a ball will actually travel further in humid conditions b/c humid air has... Sep7-04 03:26 PM bobbykilkenny 9 18,378 I recently noticed that the density of an electron, assuming it is a particle, was e21 gm cm3. This is e7 x more than... Jul11-10 10:18 AM Naty1 5 2,119 Hi assume J = I/A = equal in a circular segment of wire then after a while those electrons forces other... May13-09 12:42 AM Born2bwire 7 1,648 I've spent hours trying to understand conceptually how to find the density of moist, hot air at high temperatures, eg... Dec28-13 07:35 AM Chestermiller 11 361 we know that density of water is maximum at 3.98°C but when it is cooled below 0°C, will its density decrease by... Mar3-13 09:27 AM deep838 1 649 Would a big ball weighing 100kg with a diameter of 1 meter float in water? I guess my question is, no matter how... Mar1-12 07:07 PM Redbelly98 4 792 The definition for density \rho\equiv \frac{m}{V} is troublesome because it involves this arbitrary Volume. ... Dec14-10 07:30 PM Nabeshin 4 1,598 I'm interested in an equillibrium state between pure liquid (e.g. water) and its vapour preassure mixed with other... Nov24-10 07:20 PM GeorgeRaetz 1 908 Is there a relation between the deceleration experienced by a body in motion to the density of the medium? Stokes' law... May15-13 12:35 AM s0ft 10 716 I need the dependence of the concentration of salt in water and refractive index of this solution but i dont know it... Oct21-10 12:32 PM jaykay99 0 1,077 My question relates to fiber optics, and probably also general optics. I have a broadband SLD source, which can be... Jan22-09 01:06 PM Andy Resnick 6 903 how do u account the depression of freezing point an o/w emulsion which has sorbitol to aid tablet formation by freeze... Mar17-09 02:36 PM goku 0 1,259 Dear all, I have a question concerning Depth of Field –*I'm trying to find a depth of field calculation method that... Jan6-12 10:03 AM Andy Resnick 5 2,010 $${\rho}({\lambda}) d{\lambda}=E({\lambda})*f({E(\lambda}))*D({\lambda})d{\lambda}$$ $${\rho}({\lambda}) d{\lambda}$$... Dec7-13 06:47 PM Outrageous 2 343 One of the formulas I came across while doing problems with simple parallel plate capacitors was E = V/d, where E is... May3-12 04:46 PM jtbell 3 9,315 hello smart people I came across a weird equation for entropy and do not know how it was derived. It looks like this... Sep6-08 09:39 PM Count Iblis 3 5,210 Hi, Anyone knows the derivation for Newton´s formula F = ma ? Any help is importante for me. Thanks Sep21-11 03:48 AM harrylin 36 17,974 I am looking for a reference (derivation) for this exact formula given for "the magnetic field due to a dipole \mu... Apr13-09 08:32 AM jtbell 1 2,773 Hello everyone, I really run into a problem here. The magnification equation for mirrors describes such a... Jun12-12 02:11 AM Simon Bridge 10 3,910 I was thinking about Newton's cooling law, which was originally derived empirically, and is often described as an... Mar22-10 09:03 AM SpectraCat 2 1,672 Hi, Im getting started on analytical mechanics but need some help understanding some of the things that is said in my... Aug30-12 02:10 PM voko 19 1,038 Does anyone know of a derivation or has a reference to the derivation of the 2D KdV equation (known as the KP equation... Jun9-12 07:35 AM hunt_mat 4 1,019 Hello, does anyone know how to determine the PSF (point spread function) of an optical system? It would be ok also... Nov2-12 03:48 PM mnb96 0 455 Two boxes are side by side on a floor with friction, from the left a Force acts on them. To be more concise about the... Apr2-13 11:53 AM P.Bo 1 444 Hey everyone, am new to this forum and i have a few questions some of you will hopefully be able to help me with. I... Dec13-09 01:41 PM marcusl 1 1,086 Hi, I have some questions about the derivation of the Boltzmann distribution, for instance as in Mandl's "statistical... Aug8-09 11:49 AM haushofer 6 1,326 Hi: How do you derive the Boltzmann equation? Thanks. Dec6-10 11:04 PM quantum123 8 5,936 I have been reading about the derivation of Clausius' Inequality and there are a few things I do not understand. I... Oct19-13 05:47 AM CAF123 0 392 Hi, Got a problem with the following derivation: Coming from the Helmholtz equation one gets: ... Sep17-12 05:26 AM OneMoreName 2 1,112 I have stuck at a step during derivation. Here it is. D=bv mg-bv=ma a=g-\frac{bv}{m} \frac{dv}{dt}=g-\frac{bv}{m}... Feb15-11 10:58 AM AlephZero 2 1,637 Dear All, I need your help with a present problem - I am a student pilot, and want to see the derivation for the... Feb11-08 09:11 AM Lojzek 2 4,170 So, I'm reading Holm's Geometric Mechanics Part I, and in it he wants to derive the Eikonal equations from Fermat's... Jan11-12 07:36 PM Matterwave 2 1,760