# 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: 2,104 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 47,837 This confusion is about the following problem: Suppose the entire region below the plane z=0 is filled with uniform... May18-14 09:59 AM Meir Achuz 5 302 Hi, please could someone explain why the magnetic field is stronger at the poles of a magnet. I know that the field... May17-14 08:50 PM enorbet 3 346 http://www.ilrn.com/ilrn/books/spcp07h/Fig_20_14a.jpg I understand how motional EMF is produced, the magnetic force... May17-14 01:07 PM BruceW 11 383 Hi I'm confused after reading the definitions of physical Quantity and physical property: Definition from... May17-14 11:00 AM dauto 3 414 Hi, I've read that the speed of em waves in the vacuum is the electric field component frac the magnetic field... May17-14 10:25 AM mfb 1 222 Hello all, I would like to know a method to trap light. That is, it should be pretty simple and non-electric. It... May17-14 02:15 AM albertrichardf 12 333 I am trying to make a very strong magnet that will only last for a short pulse, just a fraction of a second, with a... May16-14 10:50 PM Pharrahnox 2 237 When a body is held or rests in equilibrium in contact with a surface (e.g. a slope, the edge of a block etc.) how do... May16-14 05:14 PM jbriggs444 7 266 I am trying to find an equation that tells the strength of a magnetic field a given distance away from the source. It... May16-14 03:04 PM mfb 22 22,376 Hey guys, umm i'm just gonna get straight to the point, why is the notation of dy/dx for example is being abused so... May16-14 10:22 AM D H 22 553 Hi All, I am thinking about building a simple electrical generator, and I am trying to make sure I clearly... May16-14 05:30 AM Pharrahnox 7 519 When water is vigorously shaken the kinetic energy and, hence, the motion of the molecules increase. Which particular... May16-14 03:05 AM Simon Bridge 1 231 To prepare for a future physics course, I googled Newton’s Laws and then found about the Work Energy Theorem. I can... May15-14 07:30 PM russ_watters 56 1,205 Hello everyone, I was wondering, is there any way of calculating the time it takes for two objects in thermal... May15-14 07:10 PM Chestermiller 1 248 Hey guys, I've been wracking my brain for a while, and thus I have landed here yet again. My problem is the... May15-14 12:11 PM crador 3 403 If I have a grounded conducting material, then I know that $\phi=0$ inside this material, no matter what the electric... May15-14 05:42 AM Simon Bridge 3 216 I had a bottle half full of ice and filled it with water and placed it in my fridge. I noticed that the ice was taking... May15-14 04:18 AM DrClaude 1 253 In the semi-classical treatment of the ideal gas, we write the partition function for the system as $$Z =... May15-14 01:38 AM WannabeNewton 1 270 I'm working on research into the feasibility of separating out the infrared rays above 1200 nm in sunlight for solar... May14-14 10:10 PM SIM77 6 230 A new variational principle is presented in this paper: http://arxiv.org/ftp/arxiv/papers/1112/1112.2286.pdf When... May14-14 02:47 PM rrhd 1 203 To every scalar field s(x,y) there corresponds a 'constant' vector field x = A s(x,y) and y = B s(x,y), where A,B are... May14-14 01:16 PM UltrafastPED 6 216 First, I'm a second year high school physics student so my thinking may be half-baked. I was wondering what motion a... May14-14 12:24 PM Agrasin 2 226 In a beam of unpolarised light, there are thousands of light waves of all polarisations. At a given point along the... May14-14 11:00 AM maline 6 408 Hello Everybody, Span efficiency factor appears in the lifting-line theory of Prandtl describing Lift and vortex... May14-14 04:07 AM A.T. 22 2,087 I have a question that has puzzled me during the last couple of days. Suppose that there is a system (e.g. a small box... May14-14 01:16 AM Jano L. 14 565 Suppose we have a collection of conductors for which the voltage is specified on some conductors and the surface... May13-14 03:01 PM komdu 2 192 Hey, It's a simple question (hope so). How do you know (analitically) wether angular momentum is conserved based... May13-14 01:49 PM stevendaryl 12 531 I am trying to calculate the maximum current drawn from a capacitor that is connected to a resistor of a very low... May13-14 02:37 AM Pharrahnox 4 270 Hi, In EM theory to derive the 'wave equation for electric field in a conducting medium' we make ρfree to be zero,... May11-14 02:55 PM Shan K 18 474 Hi everyone, I have recently been trying to make a nanoemulsion of an aqueous solution by means of Electrospray.... May11-14 02:14 PM Taylor 4 235 Afternoon all, I am interested to hear any and all suggestions as to how one would go about modelling the rise in... May11-14 02:09 PM Chestermiller 4 281 In griffith's intro to electrodynamics (4rth edition), ch. 3, pg. 121. here is the second uniqueness thrm for the... May11-14 12:20 PM WannabeNewton 3 353 Irreversible Quasistatic PV Work ( 1 2 3 ... Last) Hi 1) I am reading Pippard's Classical Thermodynamics and was confused by one of his examples in the attachment. ... May11-14 09:51 AM rkmurtyp 68 2,708 Has anyone ever "fired" an electron down the center of an evacuated tube (horizontally) to see if the electron follows... May11-14 09:20 AM Vanadium 50 5 398 For any ensemble ##dw=f(p,q,t)\frac{dp dq}{h^{3N}N!}## I do not understand this definition. ##f## is probability... May11-14 03:22 AM LagrangeEuler 0 226 Hello, It is said that any process accompanied by dissipating effects is an irreversible process.For... May11-14 01:57 AM rkmurtyp 34 1,275 Good afternoon, I am making way through this paper and I am having trouble "seeing" how the linear velocity AE is... May10-14 11:41 PM HomogenousCow 7 347 Hello, I am having one question about whether we can realize we are moving in a system, or we think that everything... May10-14 05:10 PM Matterwave 1 256 Hello, I am interested in knowing what happens ta wire trough which current is flowing, when an external magnetic,... May10-14 12:35 PM UltrafastPED 5 250 here are the two equations i'm dealing with: Eq. 1:$$W=\frac{1}{2}\sum_{i=1}^n q_{i}V(r_{i}) Eq. 2:... May10-14 02:00 AM Jano L. 7 342