# General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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### 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.
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 Meta Thread / Thread Starter Last Post Replies Views Views: 4,654 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 170 192,039 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 05:27 AM ZapperZ 2 71,131 I know that I have learned this at some point in my past and that I am probably just blanking on the explanation, but... Oct19-09 07:53 PM dschmidt12 4 884 Hello, I have had this lingering curiosity for a while. I read through this thread a second ago and would like to... Oct19-09 04:31 PM A.T. 4 1,253 Two chinese scientist have created an artificial black hole that can trap the microwave into the center of this... Oct19-09 04:29 PM russ_watters 1 842 Who can help me call BS on the physics of something I just watched on TV. Ok let me clarify that statement, of course... Oct19-09 04:02 PM GeorgeT 2 1,746 Does every object have a capacitance associated with it? For example, is there a capacitance in a single wire or a... Oct19-09 02:39 PM Bob S 3 2,496 Hi, I am interested in the relationship between changes in flow direction (and changes in flow velocity) and the... Oct19-09 02:39 PM druep 0 2,280 Can someone explain to me how power sources (e.g. power plants) transmit current/electricity in a sinusoidal (AC)... Oct19-09 01:36 PM rplatter 11 2,061 Seems they invented a device that can decrease entropy.... Oct19-09 01:35 PM Vanadium 50 18 3,341 according to many lists teh coefficient of kinetic friction of wood and steel varies greatly. any idea to a... Oct19-09 10:19 AM northern expo 0 893 So i was thinking, if you drop a ball that has a bouncy property to it, it will travel half as high after the bounce,... Oct19-09 09:51 AM Molydood 8 990 Hey guys, I am so relieved that I found a website like this, and if you can help me out, I would be a very happy... Oct19-09 08:12 AM A.T. 2 1,375 why do we see 2waves when we consider interference ????why not three or four????eg when we find out conditions... Oct19-09 03:26 AM prashantgolu 6 1,248 I have a problem wih my gutters overflowing and I wonder if it is because of the weight of water in the two sides of... Oct18-09 10:54 PM russ_watters 10 3,844 Hi all I'm new to this forum, and this is my first post. I have a question related to a claim by Ralph Rene, and... Oct18-09 05:10 PM TK Wilson 2 1,470 OK, so people say that wearing white is better than wearing black in the sun because white reflects light whereas... Oct18-09 04:39 PM mgb_phys 11 18,603 suppose we have a car on ice stuck in first gear. intuitively, I thought it should still be able attain maximum... Oct18-09 04:19 PM mender 5 1,825 The total work done by the force as the object moves from position x1 to xn can be approximated by the formula... Oct18-09 01:28 PM mars shaw 0 759 Alright bear with me. I have a physics lab due in a week dealing with the tension between two objects suspended from a... Oct18-09 11:57 AM DF2K 0 1,696 Suppose the power spectral density denoted by P(\omega) where $\omega$ is the angular frequency and \omega = 2\pi \nu,... Oct18-09 10:51 AM KFC 7 3,414 The formula for calculating the strength of the electric field bewteen 2 flat bar conductors parallel to each other is... Oct18-09 06:53 AM kd001 0 2,032 When light passes from one medium to other there is refraction but at the normal to the surface no refraction why? We... Oct17-09 10:07 PM Bob S 6 1,571 Hello~ Given the average full size bus is 50,000 Kg, how much propulsion would I be required to launch said bus,... Oct17-09 04:20 PM m.e.t.a. 6 1,196 I was looking at a program referring to dating the life of the earth and Im puzzled on a bit that Im sure must be... Oct17-09 01:37 PM Cleonis 2 1,437 This may seem like a silly question, so I shall offer my apologies in advance. I wish design an empirical... Oct17-09 01:34 PM Bojan Keevill 12 6,083 Just read the article and you will understand the title. I'm not sure where I should put this so if you want to move... Oct17-09 12:11 PM bassplayer142 3 1,695 I was wondering when do any of you from scientists or regular tv watcher think that we will have Mechanized human... Oct17-09 11:45 AM Danger 6 2,362 When talking about the translational velocity of a rigid body in physics, the velocity is always frame dependent, and... Oct17-09 10:54 AM e2m2a 0 1,399 Hey, my friend started asking questions about how energy works with circuits, and he linked me this page. I have never... Oct17-09 10:06 AM Born2bwire 1 975 Lets say I have a velocity vector thats going to the east and I want it's direction to change to somewhere else like... Oct17-09 06:58 AM thimmsoft 18 5,272 Suppose I have a superconducting solenoid MRI magnet (cooled with liquid helium) producing a static magnetic field... Oct17-09 06:44 AM vabamyyr 7 1,033 Hi, This has been bugging me for a while now. WHY do objects interact? Suppose I kick a football with my foot.... Oct17-09 06:44 AM gerbilmore 4 1,040 Hello - I was hoping - without getting too technical (please keep everything as simple as possible! =) ) if it was... Oct17-09 12:27 AM mikelepore 4 1,094 Is the Mass Defect in the atom due to the Binding Energy and does this account for that small amount of mass? does... Oct16-09 07:11 PM Redbelly98 12 4,181 Hi, I am trying to link up a series of LEDs and having a bit of trouble calculating the power supply needed. I am... Oct16-09 05:59 PM arithmetix 5 1,004 Is it possible to make one of these at home using an everyday glass bottle? If so could anyone tell me how? Thanks Oct16-09 04:37 PM jordan101 8 4,103 I'm trying to calculate what additional force would be required if a load was to be moved up an inclined plane of 6.5... Oct16-09 04:27 PM Cleonis 6 1,870 So, it looks like I'm not likely to get an answer to the question I signed up here to ask, but I figured whilst I was... Oct16-09 02:34 PM Cleonis 4 1,430 I am confuse of what is inertial frame of reference. Can someone explain that to me? I need a clear explanation... Oct16-09 10:40 AM D H 14 3,099 Please clarify / correct my misunderstanding. I'm not a physics pro (just a personal interest). Also, please excuse... Oct16-09 03:22 AM arithmetix 1 493 I think my forum name gives it away, I am a home snow maker looking to make a new snow gun and I need a little help... Oct15-09 11:19 PM FredGarvin 7 2,238

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