# 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: 2,244 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 47,855 I'm taking a first year physics course and have been having a little trouble with the basics of newtons laws and... May22-13 01:35 AM raopeng 6 723 In circuits, we have no problem saying that the voltage difference between two point is \cos(\omega t), but what does... May21-13 08:20 AM stevenb 8 1,342 I have a few questions pertaining to some concepts in electrostatics, I'd be grateful if someone would help me out. ... May22-13 01:27 PM phymathlover 9 1,082 Hello all, I am working on a science project based upon paper, and I have chosen the affect of friction between two... May21-13 11:38 AM Atham 15 1,032 Hi fellow members!!! I would like to ask a silly question because my basic concepts are quit weak. Since according to... May22-13 06:29 AM adjacent 8 1,266 Yesterday I got fascinated by the camera recordings on the Atlantis Space Shuttle.... May21-13 03:24 PM LastOneStanding 10 848 What is the distinction between EM waves and Sound waves. I know that sound is cyclical vibrations in some sort of... May23-13 06:34 AM phinds 5 689 Say, a body of mass 'm' is thrown at a certain angle with the vertical with certain initial velocity 'u'. The initial... May24-13 09:01 AM s0ft 8 754 Hello Dear Fellows! We all know that light is an electromagnetic wave and also we know that... May20-13 01:41 PM nsaspook 8 705 I have been looking at mass spectrometers, in particular the interactions between the Bf ind of a charged particle in... May21-13 09:03 PM mesa 8 668 Let's say I have a circuit consisting only of a finite number of batteries and resistors, all ideal. Given an... May22-13 07:41 AM stevenb 10 859 Hello Can anyone tell me how the absorption of a polystyrene nanoparticles scales as a function of its diameter. ... May20-13 12:06 PM Excom 2 395 In my physics book there is an example of making a square wave by "simply" summing up a few cosine waves. The book... May20-13 03:58 PM MisterX 5 844 hey all! can anyone please explain where the equation {Gmm_e}/{r^2}={mgR^2/r^2} comes from given $$ma=Gmm_e/r^2$$... May23-13 10:42 PM Zag 8 1,130 I have been looking for a better way to power my electromagnet than a bunch of AA batteries, and am now thinking of... May22-13 02:22 AM CWatters 3 626 Hello, I was wondering if there is a conceptual explanation for when current leads voltage or vice versa for... May22-13 04:43 PM mikeph 3 586 Given some chemical reaction, A+B -> C+D (all are ideal gases) that occures in 298K and 1 atm. why can't I... May21-13 12:07 PM lightarrow 6 559 If you place a wire with a running current in a magnetic field, the magnetic field will excert a force on the wire.... May23-13 09:09 AM BruceW 13 896 I am doing a paper on the physics in Valve's Portal and got interested in the "Long Fall Boots" that prevent any... May22-13 01:58 AM CWatters 2 1,125 Virtual work principle states: δW = \sum^{N}_{i=1}\vec{F}_{i}\centerdot δ\vec{r}_{i} And from this, we can see... May21-13 02:46 AM Astrum 2 523 I'm kind of rushing through first year physics cause im doing it self paced, but I am realizing now that as an... May20-13 06:43 PM Jorriss 2 344 I have a question about solenoids. The formula for the magnetic field energy density is: ... May22-13 10:08 AM milesyoung 6 843 i) If a wall breaks when it gets hit by a cannonball, did the wall exert an equal and opposite force on the... May21-13 04:58 PM faldahlawi 3 597 I've been mulling this over all weekend, and I've decided to get some help on this. The problem is writing a function... May20-13 07:25 PM milesyoung 4 619 I'm modeling a single 3D rigid body in preparation for some more complicated modeling in order to gain a better... May22-13 06:56 AM D H 5 1,364 Hello, I am wondering, what is the physical interpretation of the angular frequency of AC voltage? I don't see the... May20-13 08:40 PM BruceW 1 732 Any experts on Griffith's fracture theory? I am studying the subject and I am having hard time finding out if the... May21-13 01:19 AM wonderer_85 0 402 How is it that bubbles form on the bottom of a surface of a pot of boiling water? I think that there is probably... May21-13 10:26 PM klawlor419 9 1,410 Hi. I'm having some difficult in understanding something about the dipole term in a multipole expansion. Griffiths... May21-13 08:09 PM LastOneStanding 1 503 I wanted to mention that this solenoid has many winds over many layers. The thickness of the windings is 2.4 inches... May22-13 08:10 PM eigenstaytes 0 471 Can we convert energy to matter? May21-13 08:49 PM velocity boy 12 1,329 I'm having some difficulty understanding exactly what the difference between the definitions of these values are. As I... May22-13 05:25 AM Suvat99 0 576 Hello everyone, A friend of mine came up with this question in class and I really do not have a good answer. ... May22-13 05:15 PM Zag 4 1,073 A rough sketch of experiment. http://i43.tinypic.com/14t4sk5.png the red dots represent a side view of path... May22-13 04:45 PM tiny-tim 3 547 what are the differences? Every example I find usually has a derivative or integral or some kind of calculus defined... May22-13 06:44 PM HomogenousCow 4 773 For example.... wind turbines are primarily listed by their wattage (1.5MW etc.) Presumably their output is varied... May23-13 11:55 AM marcophys 3 666 My model is a lever on a table top. One arm is horizontal on the table, while the other arm is raised at an angle... May23-13 06:13 PM anothersnail 4 572 Hi ... anyone now how to calculate or the formula of the rudyak-krasnolutski EFFECTIVE potencial ? the effective... May23-13 02:50 PM leaoshark 0 352 Suppose TEM wave in +z normal to a boundary on xy plane at z=0. We know E & H are tangential to the boundary. Let... May24-13 01:43 AM yungman 4 670 Wire A and B, which have the same cross-sectional area are connected in series. There is a p.d. V across the whole... May24-13 12:04 PM tech99 1 331