# Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
 Views: 8,600 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 05:26 AM ZapperZ 1 41,190 Let a = 1,2. Let Q be a 2-vector Q = (q_a) Let D be a 2*2 matrix with D_{ab} = d_{ab}(Q)\,\partial_t Feb16-14 05:32 AM tom.stoer 0 123 So, I asked myself the question, "why does the earths force of gravity effect us so dramatically on the surface of the... Feb16-14 04:05 AM kindlin 3 151 The standard equation for the damped angular frequency of a normal damped mass-spring system is ω_{d} =... Feb16-14 04:03 AM kindlin 5 199 To preface my question, I know it is related to the Gibbs paradox, but I've read the wikipedia page on it and am still... Feb16-14 01:08 AM jartsa 1 137 Hello, I was wondering, do the Lee/Kesler correlations apply at the saturation line for vapor/liquid equilibrium? I... Feb15-14 10:43 PM Maylis 0 114 So Rayleigh scattering says that higher wavelengths of light are scattered more than lower ones - but why don't we... Feb15-14 01:44 PM Jbeats245 2 169 In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like... Feb15-14 01:12 PM CWatters 1 165 Hi, this is my first post on this forum, although ive often refered to many posts for random information, so thanks to... Feb15-14 12:05 PM Giorgows 6 212 I am currently investigating pressure test safety with my current employer. Currently we test pressure vessels inside... Feb15-14 11:20 AM Ryan26 2 143 Hi Is this formula all i need for finding the speed i need to tip the trolley?... Feb15-14 08:55 AM MatsNorway 26 388 Suppose we have a infinite current sheet of surface density \sigma and apply Ampere’s law to find the magnetic field.... Feb15-14 08:03 AM DaleSpam 1 134 in a cyclotron the radius of the path of electron increases.but how if the velocity of the electron is accelerated its... Feb15-14 12:14 AM smart_worker 4 245 Hello - I'm having a difficult time finding this answer anywhere else on Physics Forums. I'm curious if anyone knows,... Feb14-14 03:48 PM sophiecentaur 6 191 One question. In the text http://locomat.loria.fr/napier/napier1619construction.pdf author calculate ... Feb14-14 11:23 AM LagrangeEuler 2 221 I read that for a rotating body the kinetic energy ##E_k = \sum \frac{1}{2}mv^2 = \frac{1}{2}{\omega}^2∑mr^2 =... Feb14-14 07:47 AM A.T. 3 151 Searching through Wikipedia (http://en.wikipedia.org/wiki/File:Resonance.PNG), I found this graph about resonance. I... Feb14-14 03:05 AM maajdl 1 126 For a damped mechanical oscillator, the energy of the system is given by E = \frac{1}{2}m \dot{x}^2 + \frac{1}{2}k... Feb13-14 10:09 PM MuIotaTau 2 187 Hi all I was just wondering if anyone could help me with estimating error caused by misalignment of an optical... Feb13-14 08:23 PM Andy Resnick 2 137 I am reviewing the first chapter of my classical mechanics book (Fetter & Walecka), and in the very first section he... Feb13-14 04:09 PM mpresic 6 265 I'm having trouble understanding the idea of escape velocity. How can an object escape the gravity of a massive object... Feb13-14 03:54 PM mpresic 22 610 I've read that if you want light to diffract through a single slit, the slit opening must be equal too or less than... Feb13-14 11:24 AM Saado 3 171 I'm trying to build up some intuition with Gauss's law, calculating the flux through surfaces given certain charge... Feb13-14 09:44 AM jfizzix 2 242 Why entropy is highest at lowest energy? Entropy is disorderness.So low energy means low disorderness.But why it is... Feb12-14 08:28 PM BvU 16 286 1)What is the difference between standing waves,beats and normal interference of any 2 waves ? 2)Is beats in sound... Feb12-14 12:33 PM olivermsun 6 237 Let say we have charged conductor M and we know its potential energy function Vm(r) when M is isolated from any... Feb12-14 07:44 AM UltrafastPED 6 205 Why is angular momentum conserved around the bottom left corner in the following set up (see attachment)? The... Feb11-14 03:34 PM peripatein 2 175 Hello there, I was taught: a = {v^2 \over R}. I substitute v for the speed of the rotating earth at the equator,... Feb11-14 02:37 PM Jonsson 3 243 if a rigid body, lets say a disk,is floating in space and we exert a force outside its center of mass will it rotate... Feb11-14 09:25 AM freephoton 2 198 hi, recently i notice that there is a dark border around all the streetlight at night. what is this phenomenon... Feb11-14 05:55 AM Simon Bridge 2 147 hey pf! so when deriving navier stokes we have, from newton's second law, \sum \vec{F} = m\frac{d \vec{V}}{dt} when... Feb11-14 02:27 AM BruceW 17 377 Suppose you have an electron moving at constant velocity. This new area that it is moving into initially had 0... Feb10-14 05:29 PM Khashishi 1 189 The velocity of any point P of a rigid body in rotation plus translation is \vec{}vp=\vec{}vCOM+\vec{}vp,COM. Now... Feb10-14 04:10 PM jbriggs444 5 198 Hi all, I am wandering if I can apply the Kramers-Kronig (KK) relations to the complex wavenumber k(ω) = k'(ω) + i... Feb10-14 02:52 PM maajdl 1 133 Does a body rotating about an axis also rotate about any other axis? Eg. Cars on a racetrack may be rotating about a... Feb10-14 12:31 PM D H 8 264 Edit: Figured it out! ∑ A_lR^lP_l(cos\theta) = -E_0Rcos\theta + ∑ \frac{B_l}{R^{l+1}}P_l(cos\theta) Goes... Feb10-14 10:14 AM tolove 0 158 This is NOT a HW question. I'd appreciate an explanation of the following: I would like to determine the forces... Feb10-14 09:22 AM olivermsun 7 186 I have been looking at the problem of 2 point masses connected by a spring in polar coordinates. The problem is solved... Feb10-14 05:13 AM voko 9 235 Hi All, I'm designing a heater for some cylindrical tubes. In my original design, I simply had a flat plate... Feb10-14 02:26 AM CWatters 1 140 Hello Physics enthusiasts Imagine an infinitesimal small current loop where the current can run clockwise or... Feb10-14 12:58 AM Meir Achuz 10 235 My question is about the centripetal acceleration formula |a| = ω^2*r. If we keep the angular speed constant then why... Feb9-14 09:22 PM AlephZero 2 211