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Quality answers to common physics questions
Jul24-14 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,141
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
168 184,835
Dear All I want to know the formula to extract the longitude of the satellite from the TLE below. I hope someone...
Sep13-12 03:34 PM
voko
1 1,099
I have no idea what angle it's talking about and also what angle im supposed to get in this problem. It seems to me...
Sep13-12 04:12 PM
HallsofIvy
3 2,199
I have to do some dataacquisition from a car with some accelerometers. 4 accelerometers is placed on the wheels...
Sep13-12 06:04 PM
256bits
1 1,360
Hello for adiabatic process, pVγ=const What is the physical meaning of the constant at the Rhs of this...
Sep13-12 08:12 PM
Q_Goest
10 1,469
I have a few questions that share a similar theme. 1) Is wind just fast-moving air particles? 2) When you're in...
Sep13-12 08:37 PM
autodidude
15 1,961
what happens to the atoms in water when it is compressed so much that all atoms have no space to move? im guessing...
Sep13-12 09:29 PM
mexfight
2 598
OK, a couple of things. 1. I know there are a few theories of "why" gravity exists with gravitons and entropy, etc....
Sep13-12 09:42 PM
jedishrfu
1 641
Ive asked this question so many times on various forums and i feel there is a simple answer that i just havent heard...
Sep14-12 06:41 AM
harrylin
17 2,566
what is the relation between Specific Heat and Absolute Temperature of any material ? Specifically, Sodium. Cp vs...
Sep14-12 08:37 AM
nasu
1 620
Hey guys, I was just reading an article on a patent Michael Jackson had under his name for one of his "anti-gravity"...
Sep14-12 09:23 AM
jedishrfu
3 769
i had a question PV=nRT is the V the volume of the container or the gas and if it was the container and i had a...
Sep14-12 10:11 AM
abdo799
3 605
Do you think that matter, energy, space, time, etc. are discrete, or continuous? If they are discrete, is...
Sep14-12 11:08 AM
Studiot
17 1,870
If the world was frictionless, would the Earth orbit underneath your feet? Would buildings and things attached to the...
Sep14-12 04:08 PM
voko
20 2,265
Scientists say that in mathematical terms in singularity all the math breaks down and you get infinity. But how come...
Sep14-12 09:24 PM
russ_watters
6 815
Hi, I realize that this might be kind of a silly question, but I am in a physics class currently and I'm having the...
Sep14-12 10:35 PM
Simon Bridge
1 1,226
Hi,I don know if my question will be clear,but I will try it.So,I m wondering how was derive this equation:...
Sep15-12 04:06 AM
thedy
0 558
We just went over Faraday's law in class and our teacher stressed how a changing flux is needed to induce an emf in...
Sep15-12 04:38 AM
BruceW
5 1,330
I've read his book and he talks about AC current frequencies of incredibly high magnitudes. How was this achieved?...
Sep15-12 05:14 AM
Dickfore
3 733
Would anyone be able to help me wire up a single phase syncronous motor with a phasing capacitor to the mains? The...
Sep15-12 08:04 AM
Khushie
0 2,066
Im really stuck and I would be grateful if someone could give me formula related to a mass that lies on a geodesic...
Sep15-12 09:49 AM
omar7860
0 697
Greetings, this is my first post, though I have been reading these forums for a while. I understand that the...
Sep15-12 10:13 AM
sanbyakuman
5 955
Recently I have been involved in a car accident, and would like to figure out what was the speed of the other car that...
Sep15-12 12:25 PM
spuding102
4 800
This may at first seem like a very stupid question, but I can't seem to get to the root of magnetism. As we all...
Sep15-12 01:30 PM
Khashishi
19 2,562
Hi everyone! I cannot find anywhere the Huygens Steiner Theorem proof, can somebody explain me this proof ?
Sep15-12 04:42 PM
nebbione
0 521
I have two fishing lines that are of the same material but one has a larger cross sectional area than the other, which...
Sep15-12 06:26 PM
nasu
12 1,196
If I am stationary and a sound source moves towards me at a constant velocity, I will hear it (the sound) increase in...
Sep15-12 09:21 PM
Kerrin
4 1,054
What is the difference between raman-spectroscopy and usual spectroscopy?
Sep15-12 11:56 PM
davenn
1 1,614
This is possibly an engineering, rather than physics, question. (Ooooooooo! Busted!) John picks up a paperclip and...
Sep16-12 02:03 AM
JeffEvarts
1 456
Not sure where better to place this thread, here or gr. Is there direct evidence photons attract one another...
Sep16-12 03:00 AM
cragar
55 7,186
Hello everyone, These days i am studying thermal physics in my classes so had a few queries to get clear about. ...
Sep16-12 09:31 AM
Studiot
27 2,577
1. Are these two the same? I'm not sure. Sometimes my teacher labels the Y axis with a Delta Displacement . Other...
Sep16-12 01:55 PM
Simon Bridge
1 1,521
Hello, I was thinking of the following question: suppose we have a body in two-dimensional space and its density is...
Sep16-12 03:10 PM
Simon Bridge
3 717
Ok,lets say an object is moving at a constant speed of Mach 7 for 20000ft. The weight for the object is 2000 lbs. ...
Sep16-12 03:51 PM
Zula110100100
4 697
And why is it parallel? Do we actually know what causes magnetism at all?
Sep16-12 04:21 PM
Naty1
2 827
If I am orbiting a charged planet that is like being in free-fall around the planet. So would I see a B field in...
Sep16-12 04:31 PM
cragar
5 603
I am trying to solve and plot the differential equations for springs. when the damping factors are under 1...
Sep16-12 05:17 PM
klawlor419
1 754
Hello, my name is Jordan Heath. I am a UBC third year student in the department of physics and am new to this forum....
Sep16-12 07:22 PM
Bobbywhy
5 871
If an asteroid was moving in the opposite direction of the moon, could it slow it down enough when it hit it to cause...
Sep17-12 06:22 AM
BruceW
13 2,018
(not a physic person so hope my description is clear enough) bridge mass = 3150 newtons (center of mass is in...
Sep17-12 10:56 AM
Kevin Priller
19 3,342
Hi I am thinking of ways how to transfer electricity so that I can separate the phase magnetically or otherwise, Ok we...
Sep17-12 12:15 PM
Naty1
4 799

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