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### Physics FAQ

Quality answers to common physics questions
May25-09 10:31 AM ZapperZ

# 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 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... Apr8-14 10:13 AM ZapperZ 166 160,181 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 05:27 AM ZapperZ 2 63,616 i really need IP topics which dont need more money and can be worked for a short time. im a 4th year student. ... Sep6-08 07:27 AM frenztoy 2 3,270 Hi all,i am extremely sorry that i am asking a very basic question,The unit of sound/noise is decibels,but unit of... Sep6-08 06:14 AM Doc Al 1 1,301 On Aug 30, 7:44 pm, "Juan R. González-Álvarez" wrote: > It seems to me that,... Sep6-08 05:00 AM Igor Khavkine 0 949 On 29 Авг, 05:27, Ian Parker wrote: > On 28 Aug, 04:29, il...@abv.bg wrote: > > So you... Sep6-08 05:00 AM ilper@abv.bg 16 1,653 ======== Welcome! to the Physics Newsgroups ========== The sci.physics.* and alt.sci.physics.* newsgroups are... Sep6-08 05:00 AM N:dlzc D:aol T:com $$dlzc$$ 0 464 On Fri, 29 Aug 2008 12:12:57 +0000 (UTC), Chalky wrote: >On Aug 29, 3:27 am, John... Sep6-08 05:00 AM John Polasek 18 1,105 "gunjanagrahari@gmail.com" wrote: > > Is there any method to determine concentration of Carbon dioxide > dissolved... Sep6-08 05:00 AM Uncle Al 2 1,944 Henrique de Andrade Gomes wrote: > I have a very simple question, does anyone know if the integral of the > scalar... Sep6-08 05:00 AM Marc Nardmann 1 1,119 Also available at http://math.ucr.edu/home/baez/week269.html August 30, 2008 This Week's Finds in Mathematical... Sep6-08 05:00 AM John Baez 0 282 I understand the principles behind recording the holograph, that we are using interference to record phase information... Sep6-08 04:24 AM skynelson 11 7,123 Hi all,actually i want to discuss about standing wave. Its little bit confusing to me.As a simple defintion,when two... Sep6-08 03:49 AM jtbell 5 1,024 Hi guys, Recently i had noticed that when i left the hot water in the shower on for a while, the mirrors would fog... Sep6-08 02:03 AM nacho-man 2 908 I have a question concerning scalar invariance with respect to an accelerating and an inertial reference frame. Here... Sep6-08 12:14 AM e2m2a 0 1,786 I am curious to hear people's opinions and to run a poll on the use of the term electrodynamics vs. the term... Sep5-08 10:03 PM cmos 0 1,975 One book about Chaos says that we can use the decrease of the information of the system to define whether the system... Sep5-08 05:58 PM Llewlyn 3 1,119 we have a physics fair next week and we have an activity. my professor told us to build a cannon that uses a... Sep5-08 07:13 AM alzek 0 2,132 To reiterate the question, can the method of cooling an object down with the Bose-Einstein Condensate reach absolute... Sep4-08 09:46 PM Andy Resnick 1 990 Can someone please help me understand how to calculate the displacement of 3 different directions and distances? Sep4-08 09:34 PM rbeale98 2 1,246 i was wondering since radiation is a form of light if it could be converted into electricity using a photovoltaic... Sep4-08 05:15 PM vivesdn 3 1,018 And why can't food be cooked with X-rays or radio waves? Sep4-08 05:07 PM vivesdn 26 3,128 escape velocity ( 1 2 3) escape velocity is defined in resnick,halliday,walker as 'the certain minimum initial speed that will cause it to move... Sep4-08 04:50 PM D H 49 8,046 I looking for a software which can optimize thermodynamic (power or refrigeration) cycle. Generally cycle consists of... Sep4-08 10:22 AM pid 0 2,941 im new to the physics world and know this is probably an easy problem but i dont know where to start Hold a pencil... Sep4-08 10:09 AM jimvoit 1 858 Suppose an object is thrown onto the sky from the surface of the earth. After it reaches certain height, earth... Sep3-08 07:36 PM Integral 1 1,321 I need to convert the earth's radius of 6.37 x 10^6 in to the km, But I need it to be the circumference in km. I... Sep3-08 04:41 PM Darkhrse99 4 1,075 If we reject the notion of fundamental dimensionful constants and interpret the constants h-bar, c and G as rescaling... Sep3-08 02:39 PM Count Iblis 0 726 Hi, So my former knowledge of electricity and its movements made me understand that only electrons move from the... Sep3-08 12:33 PM Defennder 16 2,738 Is it possible to construct 2 devices which simultaneously generate (the same) random bits indefinitely? No matter how... Sep3-08 11:21 AM Dragonfall 2 982 How to ionize He to He 2? It is for a school resarch. I have the gas in a container. Thans. Sep3-08 09:45 AM Ignition 0 1,167 (1)why is magnetic field generated when current is passed through a conductor? :confused: (2)why is current induced... Sep3-08 09:20 AM atyy 2 1,501 so im tearing my hair out with this one... the density of the earth's atmostsphere vaires with height r above the... Sep3-08 07:29 AM Redbelly98 2 1,006 is there a relation between the density of a sphere spinning at a given rate and the degree by which the minor axis... Sep3-08 06:41 AM soandos 5 1,509 If I have some water in a thin (on the order of micrometer or nanometer even) cylinder, a meniscus will form due to... Sep2-08 12:09 PM Andy Resnick 4 1,320 I work in the automotive industry and some of the products we make are resonators for engines. I always hear talk... Sep2-08 11:44 AM FredGarvin 1 944 I'm a newbee here and have read some of the posts about light photons having no mass. I have a question/comments that... Sep2-08 11:05 AM granpa 1 932 The wavelength of the light and the width of the distance between the slits affects the pattern of the two slit... Sep2-08 07:25 AM Andy Resnick 2 1,508 This is the basic Wiki definition of angular momentum. I was wondering if someone "perhapse a teacher" could put this... Sep1-08 11:48 PM jtbell 2 866 Friction between 2 surfaces is independant of the area of contact and depends only on the nature of the two materials... Sep1-08 11:27 PM rcgldr 5 8,058 The Compton's Apparatus is not good enough of an explanation. I would like to know at a fundamental level the... Sep1-08 06:23 PM russ_watters 10 1,152 Hi, I'm just trying to find out if there is a calculation to that relates deviation from a straight line to the... Sep1-08 04:47 PM blindnz 2 1,509