# General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.

### Physics FAQ

Quality answers to common physics questions
Aug12-14 11:12 PM Simon Bridge

### Physics Learning Materials

All physics courses. PDFs, tutorials and web links.
Y 10:39 AM anorlunda
 Meta Thread / Thread Starter Last Post Replies Views Views: 5,697 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Pinned: Recent Noteworthy Physics Papers ( 1 2 3 ... Last) The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have... Sep5-14 05:07 PM DennisN 170 192,478 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 05:27 AM ZapperZ 2 71,272 So the Debye-Gruneisen model seems to work quite well for most solids at low tempeartures, and in many cases at room... Jul29-14 10:35 AM earlscruggs 0 191 Hello (and sorry for this stupid question), Could someone tell me the name of this Hamiltonian H =... Jul29-14 09:26 AM kinichi 5 238 Hi,so I've just started reading the Feynman's Lectures on Physics on my own recently.By the end of chapter 2, volume... Jul29-14 07:37 AM mrhoneycinnamo 2 286 Why does "per" in 3 miles per hour mean division? Why are gradients and rates a ratio? Jul29-14 04:52 AM CWatters 3 224 why the meter bridge experiment not useful for the measurement of small resistance? Jul29-14 03:36 AM sophiecentaur 8 622 Hello everyone! I'm a civil engineering (bachelor) student, and I was fascinated by the "hydraulics" course.... Jul29-14 02:59 AM Hardik Batra 1 198 Why the earth is rotating around the sun? I know the centripetal force is required for the rotation of earth around... Jul29-14 01:08 AM Student100 22 1,369 Hello everyone. I am a college graduate perusing independent research of my own. I'm trying to figure out how to... Jul29-14 12:02 AM berkeman 5 313 Hi, I have a thought experiment I'd like to share along with a couple of quotes. First, we consider the moment when... Jul28-14 11:30 PM berkeman 1 253 Hi, I have a question on a quote I saw from Steinmetz regarding the two components of eletric field (magnetic and... Jul28-14 11:01 PM Deco56 10 288 When I was in introductory physics I remember being told that the net force (gravitational for example) inside a shell... Jul28-14 09:42 PM Jd0g33 4 257 Hello, This is a quick question that I want to know, When an object falls, does the vertical falling speed stay... Jul28-14 08:33 PM Jd0g33 1 214 Imagine somewhere far within the solar system there was an exact copy of our solar system (Proportional). But the... Jul28-14 08:24 PM Pds3.14 4 205 This has been bugging me... We all know the classic problem about how the consuming ice water burns calories, although... Jul28-14 07:05 PM 256bits 2 303 A co-worker recently shared an article with me that demonstrated a sound pulse traveling faster than c. After... Jul28-14 04:51 PM PapalPhysicist 5 241 Hello, Is spinning an object 360º horizontally a flip or a rotation? This is not homework, this is work work. ... Jul28-14 04:28 PM Nathanael 3 251 Hello i have a noobquestion: does a polymer ion battery lose capacity faster when charged and discharged at the same... Jul28-14 02:03 PM CWatters 7 427 Did the formula for velocity come from unitary method? Jul28-14 09:13 AM Doc Al 3 208 Hello everyone! I'm working on my practical project in college and it's roughly about ''air battery'' (CAES) which is... Jul28-14 06:52 AM stranger023 4 278 Hi all, I've recently learned some details about refractive indices in different media that I never knew about... Jul28-14 01:21 AM skate_nerd 15 553 I know a high school student who has this question. My first thought was that it does not hold if the mass is changing... Jul28-14 12:49 AM Jano L. 31 1,798 Why does the current across the cross section of an element, with perpendicular area vector ##d \vec{A}##, have a... Jul27-14 11:07 PM ehild 7 553 As we know Biot-Savart law follows right-hand rule, like this: ... Jul27-14 10:02 PM DaleSpam 9 1,531 In terms of structure Jul27-14 05:14 PM F=qE 2 296 I've heard terms like solid mass,or maybe still mass and I'm sure there are others so can I get a little education? Jul27-14 12:47 PM Natsirt 14 619 I'm planning to use some permanent magnets in a new kind of heat engine I designed. The properties I am seeking are: ... Jul27-14 10:20 AM TESL@ 4 574 On first reading, the description of ‘group velocity ’ appears to be quite straightforward. However, I also found a... Jul27-14 06:39 AM olivermsun 16 1,787 Question : The top of the atmosphere is at about 400 kV with respect to the surface of the Earth, corresponding to... Jul27-14 06:23 AM NascentOxygen 1 337 From what I understand lightning works like a simple capacitor. The convection brings up moist air that by... Jul26-14 11:14 PM Somnolence 4 560 Hello I was just thinking about the Newton's law of gravitation and Einstein's theory of relativity. Newton's law... Jul26-14 09:54 PM carrz 14 843 From my reading various places online it seems that plastic recycling would benefit from a cheap and easy method for... Jul26-14 09:15 PM Evanish 3 556 Hello, I am using MATLAB to simulate a Fraunhofer diffraction pattern for a given aperture, but I have a little... Jul26-14 06:21 PM olivermsun 7 1,453 Hi I want to estimate divergence of water vapor flux in atmosphere with NCEP/NCAR data I have the equations for that... Jul26-14 05:52 PM b34n5 1 1,019 So flow rate is calculated using only the parallel velocity to the area vector. Why is this? How can I mathematically... Jul26-14 04:14 PM b34n5 2 496 When I sample a certain digital signal with increasing sampling frequency, the fast Fourier transform of the sampled... Jul26-14 02:58 PM DrGreg 2 377 Hi As I'm sure we're all aware, there are many planned missions to Mars. Given its distance (some 3 years away... Jul26-14 01:52 PM Nugatory 36 2,455 I am unable understand this Integral, what does it actually saying? What does that "δ" means here? I haven't learnt... Jul26-14 12:51 PM twoslit 2 468 Hi guys, I need some help with a sci-fi screenplay featuring very maneuverable hover cars. Past the maneuverability,... Jul26-14 12:15 PM twoslit 17 753 Hi! a very basic question that probably has a simple answer: would it be possible to trace a laser moving over a... Jul26-14 12:12 PM Nugatory 3 436 In theoretical physics, why is the mathematical model favored over the mechanical model? Awhile back, I posted a... Jul26-14 07:14 AM Vanadium 50 10 750

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