# 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: 80,137 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 45,729 Please disregard this post Oct17-12 12:54 AM 1101 0 826 How fast is speed of signal between 2 atoms ? Is it speed of light in electric field and then it slows down to speed... Oct16-12 09:50 PM Drakkith 3 875 Hello! I am interested in building a cyclotron. Since I doubt that I will be compotent enough to build a cyclotron... Oct16-12 08:59 PM Vanadium 50 23 1,336 Question for the brilliant minds around here: I'm trying to figure the amount of torque (I*a) needed to rotate a... Oct16-12 01:18 PM alevesque 4 1,439 So I need a motor that is able to provide $$0.412Nm$$ of continuous torque (to overcome... Oct16-12 08:02 AM CWatters 5 1,309 I have to admit I don't really understand this theorem fully. As far as I understand it says that the work done on a... Oct16-12 07:07 AM Q-reeus 3 1,088 Imagine a dielectric cylinder placed in a uniform magnetic field parallel to its axis. Then we make it rotate around... Oct16-12 02:24 AM DrDu 13 1,485 Is there any known method to convert straight into electrical energy? without all that 'steam' part? xD Oct15-12 08:10 PM russ_watters 8 942 I'm having trouble understanding what happens to the internal energy of an ideal gas being compressed adiabatically. ... Oct15-12 06:17 PM aa1607 2 1,445 Hey, I was just playing about with some lagrangian mechanics and tried to work out the angular momentum of the earth;... Oct15-12 05:56 PM TheDragon 2 1,010 A 200 kg canoe lies at rest in the water, near a dock but untethered. Any friction between the canoe and the water is... Oct15-12 01:49 PM haruspex 1 1,118 Hello all. I'm a newer engineer in rotor dynamics trying to better understand some things, so perhaps someone can... Oct15-12 11:54 AM mfb 6 1,503 Is it because for there to be work there must be heat entering the system, which is what is really causing the... Oct15-12 11:06 AM raopeng 4 891 Hello I wrote a simple simulation of an 2D ideal gas, with elastic collisions. I wonder how should I simulate the... Oct15-12 06:31 AM mikeph 3 853 Title says it all, confused as to how I'm supposed to define the phase space of a system, in my lecture notes I have... Oct15-12 12:17 AM capandbells 4 1,002 Hi, I am working on an example that demonstrates Newtons laws in 3-dimensions (this is NOT homework). In my example I... Oct14-12 04:49 PM Vanadium 50 1 733 Hello, if I put two plates one in front of the other and apply a voltage I read that an electric field creates, but... Oct14-12 04:18 PM scientifico 3 680 I'm a bit confused about the effect of the size of ferromagnetic material on the magnetic field it generates so I was... Oct14-12 04:04 PM Per Oni 2 684 Hi all, I am brand new here and need some help - i hope it is the right category i am posting in. I am no... Oct14-12 12:25 PM haruspex 5 1,449 So I just wanted to clarify: Because D = ε0E + P P being zero in vacuum and ∇D is constant regardless of... Oct14-12 12:08 PM Danen 2 547 Hi! I have attached the picture. Can someone please tell me what equation of motion will be? My guess is that it will... Oct13-12 05:43 PM mfb 3 585 Hi! The damped oscillator equation is as follows: x(t)= A exp(γt/2) cos(ωt) where ω= √( (w0)^2 + (γ^2)/4 ) I... Oct13-12 12:25 PM Philip Wood 6 628 Consider a simple two particle system with two point masses of mass m at x1 and x2 with a potential energy relative to... Oct13-12 11:16 AM mfb 6 881 In a heat transfer with internal heat generation what does the term "internal heat generation" mean? Is that... Oct13-12 10:07 AM Chestermiller 3 1,368 Hi, I'm writing a small student-paper on heat pumps, and I'm not at the point where i explain the physics behind... Oct13-12 09:50 AM andrien 1 2,385 I'm investigating the phenomenon of sonoluminescence. A quick search has yielded the Rayleigh-Plesset equation as... Oct13-12 09:46 AM Ashiataka 2 707 Do you know some example of an operator, other than momentum or position, that has (at least partially) continuous... Oct13-12 09:16 AM Jano L. 3 683 The heat equation predicts that heat spreads infinitely far over arbitrarily small time intervals. What happens in... Oct13-12 09:04 AM espen180 1 821 Last semester I did a project for grade 12 physics where I had to account for air resistance in projectile motion. I... Oct13-12 06:09 AM mfb 3 1,166 Hi there, I'm trying to create a sheet that produces a uniform magnetic field,using either rectangular or... Oct13-12 05:17 AM Q-reeus 4 812 The function for simple harmonic oscillation is: Acos(ωT)+\phi Why is there an angle phi added to the function... Oct12-12 10:09 PM CrazyNeutrino 8 2,155 Not sure if this should be in quantum section, please move if necessary. We know that: 1. A stationary particle... Oct12-12 05:17 PM Jano L. 2 1,083 I have a small pump system for an aquarium, and have decided to build a small manifold. The total volume of the... Oct12-12 01:23 PM jakestenson 3 1,009 In a Faraday flashlight, a magnet is shaken to and fro in a solenoid to induce an EMF and thus current. Something like... Oct12-12 12:19 PM Q-reeus 5 1,320 we set limits by what we can measure; therefore, it is what we have. This is my general understanding. I think it... Oct12-12 08:09 AM Q-reeus 16 2,382 This is a simple enough question, but no one has been able to give me a satisfying explanation. Most people compare... Oct12-12 05:51 AM CWatters 25 10,180 When people talk about sunspots and the solar cycle and stuff like that, they often mention magnetic field lines... Oct12-12 05:16 AM Q-reeus 3 963 I was wondering, after discovering that in particular scenarios atoms can release photons, how they do it? Is some of... Oct12-12 04:26 AM Drakkith 6 1,210 I am very confused with a particular aspect of part of my physics curriculum. Let's say there is an object swinging... Oct12-12 02:46 AM Simon Bridge 1 1,260 I was wondering that since most forms of energy can either be in wave or particle form, (example; photons and... Oct12-12 12:26 AM Drakkith 5 1,041