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- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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Quality answers to common physics questions
Aug12-14 11:12 PM Simon Bridge 
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All physics courses. PDFs, tutorials and web links.
Aug14-14 03:46 PM DrDanny 
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Jan16-12 Greg Bernhardt
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
168 189,907
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 70,320
plz anyone of u please help me out in these few questions.... 1.) A jeweller has a crown which he thinks is made of...
Aug23-05 12:01 PM
0 829
Hi people, I wanted to ask those who have started doing some research and have lots of downloaded articles on their...
Aug23-05 11:53 AM
0 970
Note to newcomers: This is a very old thread that does not meet the current forum guidelines and has therefore been...
Aug23-05 07:47 AM
49 116,354
Ok, I have a question concerning one (rather important) aspect of time travel I don't recal anyone really discussing;...
Aug23-05 07:23 AM
6 2,307
Hello, i've read an EMP subject on this site a few minutes ago, it' didn't help me anything at all. My buddy had...
Aug23-05 02:00 AM
5 2,774
I'm not exactly sure where to post this, but does anybody know of a website that has different historical papers from...
Aug22-05 01:21 PM
4 2,097
hi...can someone pls suggest a scientific breakthrough (recently:2-3 yrs) that is related in physics..aomething easy...
Aug22-05 01:09 PM
1 1,708
a dummy question, but does a photon correspond to one wavelength of a wave...does wave mean one wave length?
Aug22-05 09:07 AM
5 1,062
OK, semantic hair-splitting time. The two words "property" and "characteristic" mean essentially the same thing,...
Aug22-05 05:47 AM
Chi Meson
8 14,681 One of many articles on the proof that lightning is caused by...
Aug21-05 11:39 PM
1 880
Why does the point rule arise as a consequence of conservation of charge?
Aug21-05 07:50 PM
16 5,664
I understand that background radiation that we observe actually dates from the time of the creation of the universe...
Aug21-05 01:04 PM
20 3,543
Hi, Heres a little discussion topic that I find interesting. What is the difference between discovery and...
Aug21-05 10:50 AM
8 16,239
When a ray of light travels from an optically denser medium to a rarer one such that the angle of incidence equals the...
Aug21-05 10:48 AM
6 1,820
Why the Michelson-Morley experiment is not reliable, and why Einsteins (I dont want to reveal my identity over the...
Aug21-05 08:14 AM
Doc Al
3 1,464
Which is the maximum acceleration that a body (like a person or a car) can reach in the ground, and without using any...
Aug21-05 01:11 AM
34 11,195
If I understand well, Planck units are fundamental in the sense that they don't depend on any arbitrary choice of...
Aug21-05 01:04 AM
25 4,761
It may be a strange question, Is there a dominant colour in our universe? ignoring black and white. I have looked but...
Aug21-05 12:58 AM
9 2,136
Ok... Just came across something weird and interesting in one of my physics books and I thought I'd share it and...
Aug20-05 01:07 PM
Meir Achuz
4 5,074
If the emissivity of a flat surface varies with zenith angle according to e=E*cos(theta) where E is the...
Aug20-05 11:14 AM
1 1,860
What equation represents the force of air resistance? Is it simply \vec F_{air} = c \vec v , or must the velocity be...
Aug20-05 10:22 AM
6 4,075
Can anybody recommend some good quantum field theory books for introduction to the subject? I am already familiar with...
Aug20-05 04:07 AM
2 1,766
Ok, I was looking through technocrat and I saw a link to this article which claims, that physicists have not only...
Aug20-05 01:52 AM
6 1,621
Hi I am a year 12 student from Australia and I have to design an experiment. I have no idea what to do. Design is not...
Aug20-05 01:03 AM
7 888
Do others have bits of 'simple' (or, indeed, complex, but the simple has a bigger 'wow' factor, I reckon) Physics that...
Aug19-05 06:16 PM
31 6,336
What is the relationship between the number of branch points and the number of independent current in a circuit?
Aug19-05 11:15 AM
1 1,121
I was just wondering what kind of physics or general science sites you all regularily visit. For me it's here and...
Aug19-05 10:27 AM
3 1,188
I've often wondered what a Type 3 Civilization could do if they had the technology to convert gaseous planets such as:...
Aug19-05 09:43 AM
9 1,877
A softball sized ball is filled with hundreds of spinning micro gyroscopes. The axis of the spinning gyroscopes are...
Aug19-05 06:37 AM
18 2,646
Hello, I'm trying to really understand orbits. I want to be able to calculate the velocity at any given point in an...
Aug18-05 03:14 PM
5 4,294
I can`t seem to find any information on how to calculate the magnetic field outside a real finite solenoid. I do not...
Aug18-05 03:13 PM
5 6,437
Hi there! I'm not english, and i learned Physics in German, so i don't know how certain things are called. I am...
Aug17-05 05:27 PM
2 1,194
Now somewhat near the end of Hyperspace, It spoke of blackholes and how light can't escape. Doesn't that mean that if...
Aug17-05 01:08 PM
4 2,624
hiya was juss wonderin if anyone can describe to me how electrolysis kills hair cells pls?
Aug16-05 08:04 PM
0 1,642
Does anyone know any good physics PDA programs, preferably freeware.. And where I could get it, thanks
Aug16-05 08:01 PM
0 1,532
Is light a wave or particles. If it is made up of particles, then light cannot have frequencies, can it? OR If it...
Aug16-05 07:06 AM
8 1,110
Excuse the lay question, but how do peer review journals work these days, with the advent of the internet? I've seen...
Aug16-05 06:03 AM
1 1,572
I've heard them used before...some sort of symmetry, but I never figured out what it really is. Can someone please...
Aug15-05 08:42 PM
3 1,076
i.e. the Douglas Robb memorial lectures from Auckland University, They're available streamed here: ...
Aug15-05 03:12 PM
2 9,385
What is the speed of electricity? How fast does electricity travel?
Aug15-05 01:38 PM
27 32,608

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