# 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: 2,534 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 47,891 Why is the weight of the liquid displaced = buoyancy force and not the weight of the submerged volume of the object? ... Aug14-14 01:19 PM shangriphysics 9 225 Consider a parallel plate capacitor with layers of dielectric between its plates somehow that the interfaces between... Aug14-14 01:17 PM Born2bwire 1 131 Hello, On p.573 of Jackson 2nd Ed. (section 12.1), he says, "From the first postulate of special relativity the... Aug14-14 11:39 AM HJ Farnsworth 2 195 Suppose I have a sealed container of fixed volume containing 3/4 air and 1/4 of some liquid by volume at room... Aug14-14 10:43 AM Larry Shick 4 208 If I understand it correct during hammerthrow an athlete muscles cause Fcentripetal force on a ball and ball cause... Aug14-14 06:31 AM rcgldr 11 210 Hi to all. I'm looking for ways heat could be converted directly to electrical energy. I figured out some machinery... Aug14-14 03:51 AM inelwk22 15 1,285 I know that if density of an object is equal to density of fluid, the object will be fully submerged hovering right... Aug13-14 07:33 AM sophiecentaur 7 195 Entropy gave us that everything can happen, just that the chances of it happening is very slim. If time is infinite,... Aug12-14 10:16 PM Simon Bridge 6 383 I have been struggling with the following; (apologies if this is a simple question) After reading the Hershel... Aug12-14 01:41 PM mfb 3 185 Hello all, as a recent graduate and a new teacher, I am living in Honduras and teaching the sciences in a high school... Aug12-14 01:06 PM Rocky9242 2 200 Quick question. If the EM field vectors are perpendicular to the direction that an EM wave is traveling, how can light... Aug12-14 12:29 PM DaleSpam 58 1,393 Hi Folks, Why does a parachutist experience 0g (assuming falling in a vacuum, no drag) when falling towards the... Aug12-14 06:11 AM Lsos 4 277 I'm trying to understand the kinematic equations well enough to explain to someone else, but the analogies I've come... Aug12-14 02:14 AM haruspex 3 187 Hi everyone, A couple of question I was thinking about regarding sound: 1) A sound source is moving at the speed... Aug11-14 07:34 PM billy_joule 6 282 I am not sure if this question even makes any sense, it just popped in my mind while reading a book on special... Aug11-14 02:50 PM Orodruin 37 805 Hi all, I've got a quick clarification question. Generally when the production of electromagnetic waves are... Aug11-14 02:34 PM DaleSpam 2 153 I don't really understand what is the need of giving feedback in the magnetostriction method to produce ultrasonic... Aug11-14 01:27 PM smart_worker 2 259 Before you go through all the trouble of reading all this back story the real information is towards the bottom... Aug11-14 08:35 AM A.T. 17 356 TIR (total internal reflection) is the most common way of producing evanescent wave, e.g. TIR fluorescence microscopy.... Aug11-14 05:34 AM iuvenes 0 210 Just wondering, in order to polarize a light beam with a wire grid you could also get some difraction in despite of... Aug10-14 08:22 PM namati 2 179 I am confused with the wording for a static friction problem; this particular wording also lead me to a conceptual... Aug10-14 09:16 AM KatamariDamacy 13 312 I'd like some help to understand how to calculate "lost work" for irreversible heat transfer across a finite... Aug10-14 02:56 AM PatrickAndrews 12 396 I've been looking into electromagnet design and there is a certain principle/set of equations that are bothering me...... Aug9-14 10:57 PM Simon Bridge 5 318 Folks, I am having difficulty correctly representing a mechanical system within a correct "control volume at an... Aug9-14 03:14 PM bugatti79 7 257 $$\vec{F}=q\vec{v}\times\vec{B}$$ $$\frac{d\vec{F}}{dq}=\vec{v}\times\vec{B}$$ \int\frac{d\vec{F}}{dq} \cdot... Aug9-14 12:20 PM iScience 1 228 Coming from a Chemistry background, we seem to flippantly explain away chemical phenomena using "Coulomb's Law" but... Aug9-14 05:24 AM Delta² 7 290 I managed to confuse myself with a simple thought experiment. I have a space ship that uses mechanical springs... Aug8-14 05:16 AM fulis 2 219 I need to do something for a project. Basically, I need to be able to project a clear image onto a mirror while still... Aug8-14 03:53 AM sophiecentaur 7 246 I am working on making an aluminum truck bed cover for a customer despite my attempts to pass it up, he insists that i... Aug7-14 06:59 PM Metal Man 30 705 What is the minimum speed at which electrons can be emitted? Why is it I never heard of really slow moving electrons,... Aug7-14 04:47 PM Nugatory 27 648 Hi everybody, I encountered this question as an example of what a google applicant is asked: You are shrunk to... Aug7-14 03:06 PM A.T. 8 279 I'm having some difficulty setting up a problem. I'm trying to model the temperature of a thermistor connected to a... Aug7-14 11:09 AM 16universes 32 641 I had an interesting thought regarding the "arrow of time" and, with the hope of getting the opinion of someone... Aug7-14 07:03 AM Philip Wood 8 352 Hi I had a question based on inertia if two balls one heavy and one light are on a bus which is moving with... Aug7-14 06:06 AM sophiecentaur 16 441 Please confirm & answer the following: An atom exposed to an external B-field will experience both a torque on its... Aug6-14 09:45 PM 256bits 1 224 I would like to know if there is any proof as to whether the moment of inertia for two bodies (the masses of each body... Aug6-14 07:12 AM sophiecentaur 6 268 Suppose a point charge is accelerating uniformly. It emits EM radiation. If an observer is co-moving with the point... Aug6-14 03:41 AM vanhees71 5 282 Can a magnetization density that is compactly supported be the gradient of a scalar field? This question relates to... Aug6-14 03:35 AM vanhees71 4 225 I am trying to calculate heat transfer from an inclined flat plate under free convection conditions. I am referring to... Aug5-14 02:08 PM jlefevre76 6 224 What does p = mv really mean? For example, why is there a physical law based upon the product of mass and velocity?... Aug5-14 01:43 PM olivermsun 57 1,798