# General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
 Meta Thread / Thread Starter Last Post Replies Views Views: 67,098 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 05:27 AM ZapperZ 2 67,777 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... May6-14 04:32 AM Cthugha 168 177,200 Last year in physics, i noticed that the formula for kinetic energy is ( E=1/2mv^2 ) looks an awful lot like the... Jul13-07 11:52 AM LHarriger 11 1,203 My physics textbook talks about them like they are two different things. Can someone explain further? Thanks for... Jul13-07 12:45 PM belliott4488 3 6,494 When and electron loses energy it drops in orbit of the neucleous, but does it pick up veolocity? In this lecture at... Jul13-07 07:03 PM olgranpappy 12 1,843 I am currently having some difficulty in recalling/understanding the potential difference across parallel circuits.... Jul13-07 11:51 PM truewt 36 30,485 I have a ruler which is connected to a spring that causes the ruler to move in a circular motion around the spring.... Jul14-07 12:59 AM Ry122 2 822 hello all i started to read recently about blackhole production and decay rates at LHC to know more about it i... Jul14-07 05:00 AM dalimoh@gmail.com 0 1,530 Hi. I am working through Schutz's Geometrical Methods of Mathematical Physics. In the section on Hamiltonian... Jul14-07 05:00 AM AGS 0 1,361 On Jul 6, 3:41 am, Gerry Quinn wrote: > In article... Jul14-07 05:00 AM Gerard Westendorp 9 753 During 1915 through 1917 Einstein published two or three papers introducing the idea of downward stimulated... Jul14-07 05:00 AM AES 2 6,801 Hi, I am just learning GR (a gap in my physics education). I have a few elementary questions: 1. Does the Feynman... Jul14-07 05:00 AM iuval 18 1,450 A month ago I have started a thread called Maxwell versus Compton. Unfortunately I didn't have time to join the... Jul14-07 05:00 AM kvblake 0 944 Hi, I'm looking for course, lecture notes, ppt, pdf about magnetic reconnection. Maybe somebody here's got... Jul14-07 12:31 PM jtbell 1 1,009 Matter is anything that has mass and occupy space. Yet what is mass? Mass is the quantity of matter. This is a... Jul14-07 05:44 PM ZapperZ 12 2,089 Hi: EASER = Electricity Amplification by the Stimulated Emission of Radiation MAASER = MAgnetism Amplification... Jul15-07 05:00 AM AES 3 778 when performing a double slit experiment using photons it is said that if you fire individual photons that over time... Jul16-07 10:17 AM ZapperZ 5 1,213 Hi Im trying to find the elastic potential energy stored in a mousetrap spring. I plan on doing this by graphing the... Jul16-07 02:50 PM olgranpappy 5 3,339 Hi, I have an interest (for simple game physics) in basic equations like the trajectory of a projectile and... Jul16-07 03:02 PM olgranpappy 3 938 Hi, when someone gives me an angular frequency in units of inverse length (i.e., 520.5 cm^-1) how do I convert that to... Jul17-07 03:09 AM xez 2 17,778 In article <4696ac98$0$331\$e4fe514c@news.xs4all.nl>, Gerard Westendorp wrote: > In general, if... Jul17-07 05:00 AM Gerard Westendorp 1 765 Dear all, If I have a strong magnetic field present (an oscillating field at say 60Hz), how can I eliminate its... Jul17-07 06:31 AM xez 1 1,738 I was recently watching an episode of The View on youtube where they were talking about 9/11 conspiracys. Rosie (I... Jul17-07 11:25 AM russ_watters 4 29,736 Hi, I'm trying to program a little 2D game to test some physics out. What I want is a ground formed from a set... Jul17-07 09:23 PM Claude Bile 7 1,458 Starting some sixty years ago Toraldo di Francia wrote several papers on what he called "parageometrical optics" as... Jul18-07 05:00 AM rge11x 0 839 To whom it might concern: I've made my thesis on bound-free pair production by photon impact available in PDF format:... Jul18-07 05:00 AM Carsten Agger 0 960 Hello, I've just understood enough of basic gauge theory that I almost understand EM arising as a gauge theory.... Jul18-07 05:00 AM markwh04@yahoo.com 2 1,042 I have a basic question about plano-convex lenses. suppose that I want to collimate the bean angle produced by a led... Jul18-07 11:44 AM mgb_phys 4 14,198 Any barrier passes more low frequencies than high (i.e. the amplitude of transmitted wave is higher when the frequency... Jul18-07 01:24 PM berkeman 4 1,839 Okay, I'm sort of confused about forces and acceleration here. Does any force cause an acceleration? What if the force... Jul18-07 04:08 PM alvaros 10 2,900 Hey everyone. I'm taking physics 2 right now in the summer and my professor keeps saying you can get free electricity,... Jul18-07 06:06 PM berkeman 8 2,115 if gravitation is present, will there be a capillary rise of liquid in vaccume? Jul19-07 03:24 AM abhijitlohiya 4 3,676 Well, I am currently having a discussion about leading shots with warships. One person thinks that a shell fired from... Jul19-07 11:57 AM russ_watters 2 1,450 Here is a question, which may seem dumb: Consider an electron and a positron that annihilate, both of which are... Jul19-07 02:07 PM affinefield 18 2,707 Hi, It is generally not my style to ask for this type of help... But I am now summarizing my PhD thesis, and I feel... Jul19-07 08:54 PM Claude Bile 1 1,043 So I have two (somewhat) related questions. 1) Why is it wheel rims (or spokes) sometimes appear to spin backward?... Jul20-07 12:32 AM Danger 18 3,108 I am wondering about the extent to which the generation of gravitational waves is dependent upon the assumption that... Jul20-07 05:01 AM rlolders...@amherst.edu 0 969 I've been taking part in a long thread on the online Physics Forums regarding a relativistic treatment of a spinning... Jul20-07 05:02 AM Darwin 9 877 (A part of) My paper "GR-friendly description of quantum systems" (IJTP, DOI 10.1007/s10773-007-9474-3,... Jul20-07 05:03 AM V. Trifonov 0 595 We had a experiment on a metal ball dropped on a Falling sphere viscometer containing a certain liquid(I forgot what... Jul20-07 06:42 AM FredGarvin 1 7,537 Hey guys, I'm currently having some trouble regarding the water pipe systems. The problem arose as I was exploring... Jul20-07 11:18 AM Q_Goest 11 7,951 Here's the problem: 2 Battleships are travelling at the same speed and at the same direction. They both have the... Jul20-07 05:23 PM PleaseHelpMe 14 1,815