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

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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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
166 160,042
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 63,560
When I hold a lighter up in the air with the flame lit, and spray water mist above the flame, I can get the flame to...
Jun1-09 05:48 AM
physical1
1 870
Hi Guys I am trying to use a water filter in line with a 12V water pump rather than off the mains. The water...
May31-09 09:37 PM
Bob S
1 3,385
I have devised a simple thought experiment which leads me to an absurd conclusion and I feel Iím missing something...
May31-09 09:36 PM
Riemannliness
4 1,681
For understand general relativity, they tell me, there have flat space, add a sun, the flat space changed to curved...
May31-09 08:48 PM
DaleSpam
4 771
Greetings all, I've recently been wondering why I see sparks of light when I stick certain metal objects into a...
May31-09 07:14 PM
microwaveguru
6 5,102
I didnt know were to post this so it just goes here :). (btw I'm in 9th grade so complexity is not an option.) ...
May31-09 06:52 PM
physical1
26 2,243
Hey my friends please solve my problem Both longitudinal and transverse waves can propagate through a solid. A wave...
May31-09 09:19 AM
coverme
3 1,352
V(t)=IR(1-e^{t/RC}) \rightarrow ln|IR - V(t)| = ln|IR|-t/RC The first equation below has units of...
May31-09 08:13 AM
DrGreg
26 3,112
What is present and projected efficiency of pyroelectric heat to electricity converters? What is efficiency of such...
May31-09 12:42 AM
Stanley514
0 1,099
why is the term "ultraviolet light" misleading? is it because it is more on the violet end of the spectrum than...
May31-09 12:13 AM
mgb_phys
2 820
I understand that as the frequency of an electromagnetic wave increases, its refractive index decreases in a material....
May30-09 08:24 PM
Redbelly98
4 2,663
Analogous to understanding of gravity in the days before Einstein, I know the effects of Charge and can even feel it,...
May30-09 08:12 PM
earamsey
15 1,177
Sometimes I think I'll never understand anything about photons. In isolation things seem to make sense, but put...
May30-09 07:16 PM
lhmonteiro
4 1,254
I have been reading about Acceleration Due To Gravity. All sources including Fundamentals Of Physics By Resnik say...
May30-09 07:16 PM
ZapperZ
39 31,550
Let me know if the following reasoning is correct : If the surface charge density on the internal surface of one...
May30-09 12:04 PM
Bob S
9 6,320
Hello there my fellow physics fans! I have decided to enter a national science competition in my potato obsessed...
May30-09 09:37 AM
ScienceNerd36
3 811
What calculation is the to find the amount a helicopter (or flying device using rotor blades) can lift? I would of...
May30-09 04:53 AM
bobo67
3 5,729
Some students were performing an experiment involving 2 solenoids in a line, a power source attached to the primary,...
May30-09 03:48 AM
Drakbah
7 1,589
What causes the back emf in motors (brushless DC motors to be exact). First thing is the rotating magnetic field of...
May30-09 02:33 AM
Dadface
6 7,020
I've been throwing this term energy around for a while now, and thinking about it I have absolutely no idea what it...
May30-09 12:31 AM
ryuunoseika
39 3,531
A line about entropy on wikipedia says: "The entropy of a molecule is defined as S=K*ln(Ω) , where Ω is the...
May29-09 10:03 PM
atyy
3 1,089
To be specific, I'm sort of confused about the attenuation, or absorption, coefficient of sound. (Specifically, I'm...
May29-09 07:21 PM
darussiaman
0 1,063
I had to plot a graph of distance between a reflector and a probes vs consecutive numbers that represent the maxima. I...
May29-09 06:46 PM
bamdavis
0 923
Hi Please excuse my poor electricity knowledge.. also if this is in the wrong place to post, let me know and I'll...
May29-09 03:19 PM
krishna mohan
1 1,311
I enjoy learning new things every time I do a problem set. Take the wheatstone bridge for example. Upon my initial...
May28-09 11:52 PM
orthovector
2 654
Perhaps some semantics are involved here, Wikipedia and some others describe nuclear reactor material as going through...
May28-09 07:19 PM
mathman
10 2,940
why cant we see it as dimension like time?
May28-09 04:07 PM
Nabeshin
1 867
Reading Feynman, there are various examples of finding voltages, forces, et cetera, when you know the charge involved....
May28-09 01:11 PM
HarryWertM
17 7,347
Assume I am standing in a desert at night (It's pitch dark). I have an opaque white object in front of me inclined at...
May28-09 10:05 AM
DaveC426913
14 1,832
Hello ! My friend challenged me to remove a sheet that is under a standing pen, without the pen falling. I can only...
May28-09 09:00 AM
DaveC426913
15 1,260
Why does the tempeture of degenerate matter corelate only weakly with density? I guess the more fundamental question...
May28-09 08:23 AM
granpa
1 850
good day all, out of sheer curiosity i tried to calculate what could be my terminal velocity in a skydive, since i...
May28-09 07:53 AM
JAG.
3 12,339
Hi, time ago I found some Youtube videos and a website about this kind of device made of mirrors that invert the...
May28-09 05:07 AM
Dadface
1 827
A common thought after one learns about the limit of the speed of light is that a long rod when pushed would seem to...
May28-09 03:33 AM
Vanadium 50
3 861
Higher dielectric constant means better insulator. Water has a dielectric constant of 8, which is enormous(according...
May28-09 01:44 AM
Born2bwire
3 7,641
Hi everyone, I was just reading a physics textbook when I noticed something. The motion diagram shows that if a...
May27-09 08:52 PM
fischook
10 3,771
hello can any one helpe me about the wierless advantage and disadvantage and give me any book title
May27-09 06:55 PM
russ_watters
6 1,128
I'm currently programming a 2D rigid body dynamics engine. While I have realistic collision detection and response...
May27-09 06:12 PM
cesiumfrog
1 1,472
How is this Bio-mass power plant plausible? It says it is going to supply 29 MW of electricity by burning biomass...
May27-09 06:07 PM
Bob S
4 938
The question that really troubles me is how fast the Earth spins around its axis? I was wondering that if the earth...
May27-09 05:20 PM
Redbelly98
9 2,872

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