# 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: 1,910 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 47,810 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 13 299 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 12 393 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 5 312 Folks, I am having difficulty correctly representing a mechanical system within a correct "control volume at an... Aug9-14 03:14 PM bugatti79 7 251 $$\vec{F}=q\vec{v}\times\vec{B}$$ $$\frac{d\vec{F}}{dq}=\vec{v}\times\vec{B}$$ \int\frac{d\vec{F}}{dq} \cdot... Aug9-14 12:20 PM iScience 1 227 Coming from a Chemistry background, we seem to flippantly explain away chemical phenomena using "Coulomb's Law" but... Aug9-14 05:24 AM Delta² 7 286 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 2 217 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 7 242 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 30 691 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 27 641 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. 8 272 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 32 631 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 8 345 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 16 425 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 1 223 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 6 263 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 5 278 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 4 222 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 6 223 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 1,789 Hello Forum, The 1D harmonic oscillator is an important model of a system that oscillates periodically and... Aug4-14 09:59 PM Simon Bridge 13 369 Hello, I'm building a model train control system, and would like to use real world values and physics to control the... Aug4-14 06:37 PM KaiGrid 6 224 Two questions: 1.) Consider a hollow conductive sphere that's initially charged. These charges will distribute... Aug4-14 02:57 PM iScience 2 384 See, we know that different electrical appliances in our house require different amount current to work .now first if... Aug4-14 02:41 PM CWatters 9 306 Question about moments and torques. I understand that torque is defined as τ=Fs and understand where this comes... Aug4-14 02:17 PM CWatters 2 222 If I have ice, water and vapour at the triple point and they are in equilibrium at a temperature of 273.16. Does this... Aug4-14 09:42 AM vjacheslav 3 215 I have read that electric field inside a cavity of irregular conducting surface having any charge is zero.how is this... Aug4-14 09:07 AM Nugatory 3 197 What is the potential of Earth with respect to (wrt) infinity (C=710uF)? I am assuming that infinity is the correct... Aug3-14 06:21 PM DaleSpam 1 199 Whay is it that when we release air from our mouth when it is little open then the cold air is released but when we... Aug2-14 06:58 PM A.T. 7 311 I have some questions about electrons flow. 1)Lets say we have a simple circuit with a metal wire and a battery... Aug2-14 11:10 AM voko 7 352 http://arxiv.org/pdf/physics/0511103.pdf I was wondering what people thought of this paper. Please read up to at... Aug2-14 07:24 AM DaleSpam 8 395 If you apply 100 volts to a 10:1 transformer you will end up with 10 volts out. If you put a 10 ohm resistor on the... Aug2-14 05:30 AM Philip Wood 40 2,101 I've got a problem asking for the reflection coefficient of a system consisting of a ideal conductor covered with a... Aug2-14 12:15 AM Shyan 9 292 I need convincing that evaporative cooling is refrigeration in the sense of a heat engine run backwards. It has the... Aug1-14 10:24 PM techmologist 2 258 I was looking at this graph and wondering what the value of the graph would be before the engines turn on. Should it... Aug1-14 04:35 PM A.T. 3 266 http://demonstrations.wolfram.com/FaradayDiskDynamo/HTMLImages/index.en/popup_3.jpg disk and magnet spin together... Aug1-14 09:16 AM Drakkith 20 664 I've read a similar thread, but I believe I have something extra to ask, so please bear with me. I've been thinking... Jul31-14 01:19 PM Wes Tausend 1 223 In a martial arts breaking demo (boards, concrete blocks, or whatever) the amount of pain one's hand or other body... Jul31-14 12:35 PM CWatters 2 213 Why doesn't the higher mass cart stop after hitting the lower mass object? Is this due to an imperfection in setting... Jul31-14 07:45 AM Lok 5 246 Hi, I would like to know what is the surface temperature of a material when it is radiated from another material at a... Jul31-14 04:59 AM marco75 5 237