# Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
 Meta Thread / Thread Starter Last Post Replies Views Views: 124,181 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people... Apr22-11 05:26 AM ZapperZ 1 46,992 Is there a difference in inductance of an inductance with magnetic material whether it is magnetized or not. Meaning... Mar10-11 11:19 AM cabraham 3 1,289 Why does interfacial tension vanish at the critical pressure or temperature? I suppose really this is more a... Mar9-11 06:27 PM Ferrus 0 759 If I ran over a problem asking for power supplied by a non-ideal battery, or a battery with an internal resistance. ... Mar9-11 05:23 PM JSGandora 6 3,868 So my lecturer asked a physics audience (final year and postgrad) this question and no one got it right (at first): ... Mar9-11 04:12 PM nasu 2 3,150 If we have a set of cylindrical wires, which we know the radii and the lengths, how do we order them from least... Mar9-11 03:08 PM JSGandora 12 2,444 Poynting Theorem: \frac {dW}{dt} \;=\; \int _{v'} (\vec E \cdot \vec J) d \vec {v'} \;=\; -\frac 1 2 \frac... Mar9-11 12:19 PM kloptok 2 803 See the figure- http://www.physicsforums.com/attachment.php?attachmentid=32890&stc=1&d=1299618716 The block A... Mar9-11 11:53 AM Subductionzon 8 3,584 I know a little bit about them already but I don't know exactly just how and why they work. I know that they are... Mar9-11 09:44 AM jtbell 4 3,035 Is there any possible way that an electric field between two positivly charged plates (charge is the same on both of... Mar9-11 09:42 AM umciukas 2 766 Hi there, physics lovers. I'm studying field theory. So far, so well. I got it with the lagrangian density. I... Mar9-11 07:30 AM MManuel Abad 8 1,450 Suppose you have a dissipative system where \dot{q}=p/m \dot{p}=-\gamma p -k\sin(q) So there isn't a... Mar9-11 05:19 AM homology 39 3,295 Hi everyone, I'd like to ask you a question. How to calculate the diffusion speed from a bulk of gas with... Mar9-11 03:26 AM zhaoxh 3 2,270 Hi - I'm designing a dining table, and am trying to calculate how much weight could be applied at the edge of the... Mar8-11 08:37 PM Jonbarnes 4 2,433 Does gravity stop accelerating objects once they are in contact with Earth's surface? If so, why? Mar8-11 08:00 PM DCLawrence00 11 1,100 In scientific-popular movie The future is wild they believe that high altitude gooses should have beauty blue... Mar8-11 07:15 PM klimatos 5 11,348 I just read the following innocent sounding statement, which got me thinking: "An electron in motion relative to an... Mar8-11 12:57 PM JesseM 4 847 Rectangular wave guide, TE01 mode I'm looking for the equations of the electric and magnetic fields over the volume... Mar8-11 09:59 AM Phrak 23 5,053 Hi, I have two questions regarding the laws of thermodynamics 1) For example in... Mar8-11 09:41 AM Zeppos10 7 2,023 Hey!, I was repeating for myself a course I had from a earlier year, fluid mechanics. I looked at the derivation of... Mar8-11 08:32 AM Andy Resnick 4 1,495 Good Day, Understanding that Rayleigh scattering is a limiting case of Mie scattering why physically do we see... Mar8-11 08:09 AM Andy Resnick 6 2,999 Hi, have somebody read this book? Guillemin and Sternberg introduces the notion of mass on page 435. But I don't... Mar8-11 01:24 AM mma 0 1,316 What i mean to say is that, i understand the concept of "change of distance", "change of time" and other changes and... Mar7-11 08:53 PM ijkijk 8 2,288 Hey guys, the other day i was reading about eddy currents and it was getting intersting, except i had a few questions... Mar7-11 12:33 PM type_writer 4 2,047 A Van der Waals gas in thermal contact with a heat reservoir at temperature T0 undergoes a reversible, isothermal... Mar7-11 12:30 PM randybryan 0 2,572 Today, during class, our professor went through a simple example about Piezoelectricity. We have a cylinder with a... Mar7-11 11:53 AM johnmadsen88 0 696 According to this site http://quantummechanics.ucsd.edu/ph130a/130_notes/node453.html a good choice of... Mar7-11 05:29 AM snoopies622 5 1,158 So I'm pretty sure I have the right answer I just wanna make sure I am getting the idea. There is a large solid... Mar7-11 04:57 AM fysicsandphol 2 1,010 This is not homework even thought this is an example in the book of Griffiths "Introduction of Electrodynamics" 3rd... Mar7-11 04:26 AM kcdodd 4 1,221 This is a question I made up for a math research paper. Please tell me what you think about it, I'm not asking anyone... Mar7-11 01:03 AM MisterMumbleX 0 707 I was wondering - when pressure is applied to solids, do they heat up? Not pressure like an impact - I'm not talking... Mar6-11 10:53 PM RedX 6 2,108 My idea is : electricity can be transfered 100% into heat. Mechanical energy can be as well. But heat can not be... Mar6-11 10:33 PM anchorage 5 2,973 I know the ideal gas law applies, but how? Mar6-11 12:48 PM klimatos 10 12,233 reading the very interesting discussion on the long thread on the 2nd law, had a couple of much more basic questions... Mar6-11 09:36 AM A. Neumaier 17 2,265 Hi, I have a problem that in some references the magnetic energy is B^2/(2 mu) and in some references it is... Mar6-11 09:32 AM asheg 4 1,558 hi;I am a new member here. I hope to benefit from you. I love physics very much but I donot know a lot about this... Mar6-11 07:51 AM Naty1 4 1,929 Which component E or B of an electromagnetic wave is responsible for visible effect? Mar6-11 05:56 AM nipiano93 23 2,519 I am having a little trouble understanding this and I was wondering if I could get some help. I understand that... Mar5-11 10:29 PM Xyius 7 11,431 Hello all! First post! I've been meaning to join this board for a while. I'm an electronic engineer with interests... Mar5-11 06:30 PM joes1987 0 2,054 Let's consider a particle in a rotating coordinate system, bearing in mind that in classical mechanics, the... Mar5-11 07:12 AM S_klogW 0 1,561 I think I have a wrong definition of the word 'voltage'. For example, a bird perching on a live wire with its 2 legs... Mar5-11 06:32 AM homology 4 1,348