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### Physics FAQ

Quality answers to common physics questions
May25-09 11:31 AM ZapperZ

# General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
 Views: 494 Announcement: End of year contest, $75+$50 prize! Dec18-13 Meta Thread / Thread Starter Last Post Replies Views Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 06:27 AM ZapperZ 2 60,592 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... Dec9-13 04:47 AM Cthugha 162 151,638 What If there are other properties of physics we can not percieve due to a limited amount of senses. What if these are... Aug21-12 05:01 AM Ryan_m_b 19 1,489 Hi All, How do we tell the difference between something being random and something being deterministic but... Jun19-12 01:44 PM schip666! 2 833 I have a homework problem where there is a long copper wire around a toilet paper roll that is placed in a uniform... Nov17-06 02:50 PM Sir_Pogo 0 916 Hi, I'm trying to come up with some examples of ODEs (not PDES) in physics that are unsolvable analytically, and for... Mar26-13 01:27 AM SteamKing 1 471 hi, everybody, please tell me " what're Unsolved problems in physics ? " Thanks so much Sep3-07 01:32 AM nicktacik 2 2,230 I have been wondering what some of the big problems in theoretical physics and astrophysics are. Through some research... Oct2-10 08:28 AM phyzguy 8 3,901 I implemented a velocity verlet algorithm, and use it to simulate movement of particles. Depending on the parameters,... Mar8-12 12:53 PM franziss 0 957 Is it possible to simulate turbulent flow using unsteady RANS (Reynolds Averaged Navier Stokes) Dec17-08 04:39 PM escaflone 0 1,766 I don't know how to elaborate on this question any more, and I don't even know if it can be answered... BUT. Does... Dec8-05 03:17 PM Danger 1 650 I came across this problem recently. It's a pulley problem, albeit a slightly unusual one. The situation is sort of... Aug3-08 09:08 AM Doc Al 1 843 Greetings! I'm working on a project that Requires a roughly equal number of up and down spin electrons to be injected... Oct22-12 10:30 AM mfb 7 953 Recently, I went through a sort of "stage" where i wanted to disprove everything worth disproving, and we all know, if... Sep16-04 07:25 AM Smurf 11 2,375 There is now an update the the FAQ page "What is the experimental basis of Special Relativity?". There has been a... Dec27-07 06:00 AM Tom Roberts 0 1,145 hello, I would like to apologize for my ingnorance in advance. I have a question. If a person were going to walk... Aug17-06 03:14 AM rcgldr 11 1,297 A building with air capacity of 100,000 m3 is heated to 20oC on a winter day of -10oC. During a summer day of 40oC it... Aug26-03 01:31 AM russ_watters 1 1,487 As an example of a standing wave we have a musical tone, which is a combination of a fundamental pitch and a series of... Aug31-10 09:26 PM Redbelly98 6 1,873 i am wondering whether 1- there is a lower limit for short photon wavelength, or what would happen to the photon as... Oct11-06 04:07 PM Ben Rudiak-Gould 5 3,552 A rocket shoots upward with a velocity of 500 feet/sec. Neglecting air resistance, how high will it travel? ... Nov10-10 12:09 AM Grep 1 609 Just out of curiosity, can a plane fly upside down? (it can, right?) then how? Feb3-10 11:49 PM russ_watters 10 2,025 Hi, usually don't ask for help but this is bugging me now! I am working on a r/c model hovercraft, i have been... Aug4-06 09:19 PM Cyrus 3 4,821 When we put any object in a fluid it experiences upthrust. Suppose an iron cube is put in a beaker with water. It... Oct27-11 11:20 AM obafgkmrns 3 1,399 Hi all! Im a computer program that needs to simulate the motion of some bubbles. Id like to get a physically correct... Feb25-10 04:11 AM Stonebridge 2 2,115 If there is an object with a density of 0.3 gm/cu.cm in water, how long will it take to go back up to the surface if... Feb8-12 11:46 PM PeterO 1 1,036 so with buoyancy and liquid pressure i am pretty sure i know the answer but i just want to confirm (please don't laugh... Aug22-09 11:29 AM russ_watters 4 1,309 i heard that in the war between iraq and america the american soldiers used uranium bullets. why is that ? is it... May27-04 10:04 AM jono 4 2,171 (Hot here refers to temperature, NOT the obvious radioactivity),Yes, perhaps a silly question, but maybe not. I... Jun2-09 08:25 AM rcgldr 15 2,030 Help me disspell this urban myth(sorry to waste all of your time) If everyone in china jumped off a ladder at the... Nov7-03 07:50 PM NateTG 2 2,259 Hello I recently rented a small appartment and I am a bit shocked by the discovery that there is a big cellphone... Jan31-11 04:18 AM Borek 54 7,488 Hello everyone, Am having a research about the use of fiber optics in illuminating a room for example by taking solar... Jun1-10 04:56 PM Lambduh 2 887 i know that torque = force x radius (for a wheel of a car driving) and i've found a couple of equations on power in... Jun5-06 11:18 PM rcgldr 8 1,788 Our Physics review sheet includes two questions involving "accelerating voltage", "deflecting voltage", and "screen... Feb14-05 10:26 PM Coldie 14 1,419 1. Does a graph of force of friction vs force normal pass through the origin? Explain. 2. Does the force of kinetic... Oct10-03 12:58 PM Fuego 10 2,197 friends... one urgent help .. i need an alternator which is light in weight and the shaft should be easy to... Oct13-09 09:08 PM Bob S 1 744 hi, This has probably been asked and answered a million times before so sorry but here goes. I urgently need help... Jan8-05 10:13 AM jtbell 5 1,056 Hi, On a conducting planar surface, with a plane wave illuminated,(s for scattered field, i for incident field) in... Apr23-12 10:45 AM Whovian 1 627 Thanks...it makes a lot of sense now! Dec6-07 09:50 PM dst 1 1,296 I am doin a project on GW Detection , pls tell me if there is anyway I can prove GW presence at project level (as in... Mar5-07 06:32 AM vanesch 3 901 Hi guys, I'm applying to university to study Natural Science and the deadline to apply is Friday. In my application... Oct12-11 02:59 PM Drakkith 1 1,395 can somebody give me a good site or send me some A level physics notes pls? Thank you. Mar29-04 03:46 PM Integral 8 961 A block of mass m is on an inclined ramp. The coefficient of static friction between the block and the ramp is µs. ... Sep27-09 11:54 PM Stride 1 2,581