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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
May25-09 10:31 AM ZapperZ 
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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 67,825
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
168 177,492
Hi, I'm interested in AM radio transmissions causing interference (not just noise, but the transmission actually...
Jul18-14 01:24 PM
kyaw ye yint
2 353
can anyone explain virtual particals and how they relate to the magnetic and the electric feilds, porfavor.:smile:...
Apr16-06 02:06 PM
chromosome24
0 1,830
can anybody explain to me virtual particals and how they related to the zero point energy?:confused:
Apr24-06 06:51 PM
chromosome24
5 1,588
I just want to know, is a technology designed to reduce the effective mass of a system possible, at least in theory? ...
Jan1-14 05:57 PM
TurtleMeister
2 411
http://i47.tinypic.com/mt55s7.jpg -See for image You drop a ball on this vertical parabola with point A as...
Jan30-13 05:22 PM
ratchettrack
8 1,019
Isaac Asimov wrote a story 50 years ago about entropy http://www.multivax.com/last_question.html I believe this...
Oct10-07 02:13 PM
chronie
2 2,913
I'm a computer science major and I was talking to a senior and he was doing a program for a presentation and he was...
Dec15-03 04:34 AM
Achy47
18 8,102
Taking martial arts they use a bit of physics to try to explain why we do certain things. Our instructor will tell us...
May15-04 08:27 PM
Chrono
3 1,157
Hi everyone, I'm doing a problem that involves two circular capacitor plates with radius R connected to wires running...
Dec3-11 06:04 PM
chronokinetic
4 2,597
The mile comes from the distance a Roman soldier covered with 1000 steps. To get the decimal point in the right...
Mar10-05 11:51 AM
arildno
10 3,126
I'm interested in the nature of the 2nd law of thermodynamics and I wrote an applet to model the transfer of energy...
Oct11-06 02:59 PM
Yung
4 856
Hello. I'm still only an undergraduate studying physics, so there's still much I don't know. Hence why it's probably...
Jan30-08 12:21 PM
rbj
8 2,529
Hello. My brain doesn't seem to be working at the moment. If a wheel's center is traveling at V0, why is the...
Oct27-08 06:46 AM
tiny-tim
1 1,428
Hello, During the spring semester of school that is just beginning I will be a junior in physics at the University...
Jan21-09 11:25 PM
Chronothread
3 1,601
I am curious as to others' beliefs/opinions on how time travel and/vs. multiverse theory correlate. ...
Jul18-04 03:04 AM
somy
42 14,531
Just like the Astronomy Q&A game in the Astronomy forum, let's play a physics Q&A game here. The astronomy game has...
Jul20-03 11:46 AM
Integral
93 8,229
Can anyone think of a circuit that takes two input voltages and produce an output voltage equal to the difference in...
Dec15-03 03:03 PM
Richard Torregano
11 11,070
Hello all, It's time for a little experiment. As part of my constant quest to stimulate discussion and bring...
Nov22-03 11:15 AM
Nereid
12 7,155
Hey everyone, As you can see, we're rapidly reaching the green light on our integration of two usenet forums: ...
Jul23-05 04:13 AM
MathematicalPhysicist
6 8,977
I am involved in a dispute related to the forces that a dog's head is exposed to when he, of its own power, runs into...
Sep18-12 12:11 PM
mrspeedybob
3 711
Ok so I'm in a Physics class and there is going to be a Cardboard Boat Race competition. So I have to build a boat out...
Dec7-08 09:59 PM
mgb_phys
3 8,367
Hi, I am taking a highschool physics course and I just need a little help grasping the concept of zero work and...
Mar18-12 10:38 PM
chubbyorphan
8 1,365
By Chuck St. Louis ...
Jan11-09 08:43 AM
Chuck St. Lou
3 1,062
Click on attachment and post your answer:smile: You'll be amazed! ...
Jan15-09 08:20 PM
Chuck St. Lou
10 1,163
Scenario A very fine almost massless thread about 30 seconds at the speed of light long that can't stretch and can't...
Jan18-09 12:42 PM
ZapperZ
16 1,550
Two Identical metiorites traveling slowly through space happen to be on a vector that will cause them to collide with...
Jan31-09 01:35 PM
russ_watters
9 2,857
I have uploaded a diagram of two closed systems in which no work can or heat can be leave the system (See attached...
Feb5-09 08:43 AM
vanesch
2 3,039
The plane wave function sometimes could be represented as: U(\mathbf{r} ,t ) = A_{0} e^{i(\mathbf{k} \cdot...
Mar11-12 11:57 AM
PhilDSP
7 3,450
I know that rubber is a type of good insulator of electricity. But the problem is that we will still get shocked when...
Mar10-12 01:48 AM
math_way
7 2,626
I want to know why the moment could be represented as the product of the bending stiffness and the curvature. I do not...
May18-12 11:29 AM
Curl
3 3,284
The memo that has "IMPEACH HIM" written all over it. The top-level government memo marked "SECRET AND STRICTLY...
Oct11-06 02:54 PM
Chuck@gregpalast.com
0 860
What elements? How a light beam became a light? Thanks in advanced.
May12-13 09:05 AM
Fredrik
2 621
Hi guys. Just wondering. What element that can't pass through light? By the way I finished computer science so...
May12-13 09:03 AM
Fredrik
19 1,084
I have a fairly large (for household use) 7.5HP electric motor driven two-stage air compressor, which charges the...
Jul15-14 09:38 AM
chuckcintron
8 465
Hello Guys According to Classical electrostatics, when you apply a voltage across a capacitor, +Q and -Q charges are...
Aug21-07 11:45 AM
chuckschuldiner
2 6,785
I asked my teacher this but he did not know so he asked me to find out. When you set fire to something (for example...
Feb26-10 07:51 AM
Mapes
4 1,982
I am thinking to use the air core to make transformer to get better linearity behaviour, but I found air core often...
Oct26-10 07:38 AM
chudiandeyu
9 2,729
Hello I recently bought a linear Hall effect sensor for measuring current, but I don't know how to make the circuit...
Aug24-12 04:01 PM
berkeman
4 5,661
I have a formula, taken from Wikipedia: http://en.wikipedia.org/wiki/Magnet#Calculating_the_Magnetic_Force But I...
Oct22-05 08:44 PM
pervect
4 6,132
If photons have no weight,how can an amount of 2.5kg of sunlight fall on earth each...
Feb5-09 05:29 PM
reasonableman
4 1,183

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