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Quality answers to common physics questions
May25-09 10:31 AM ZapperZ 
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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
Cthugha
168 178,799
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,065
We can view the amplitude vs time variation of an EM wave using an oscilloscope with the needed bandwidth. Such a...
May26-14 07:33 PM
Drakkith
13 571
Hello. I was reading Hyperphysics website and could not get one particular part. I am providing a picture of the...
May26-14 06:58 PM
WannabeNewton
4 397
I was practicing for my upcoming optics exams, by making an old exam. And got stuck on some problems that seem so...
May26-14 06:50 PM
sophiecentaur
23 1,052
Modern foil covered foam insulation and coated window glass unfortunately blocks mobile phone signals rather well. I'm...
May26-14 10:05 AM
CWatters
4 389
Hi there, I've been trying to solve this problem regarding relay imaging so that I can modify my experimental setup...
May26-14 07:24 AM
UltrafastPED
3 297
What is the relationship of conservative & non-conservative forces to the conservation of energy? What differs with...
May26-14 05:55 AM
UltrafastPED
7 371
i wan to do the folowimg : use the computer to find halftimes of isotoops that are jet unkown i want to use...
May26-14 04:33 AM
Borek
5 367
I'm trying to determine the amount of work required to create a vacuum. The vacuum will be within a one cubic meter...
May25-14 08:19 PM
kearneytj
0 305
I was thinking, and somehow I had this little "thought experiment" type thing relating to objects and the speed of...
May25-14 06:00 PM
DrStupid
5 407
If you were to take Youngs original Double Slit Experiment, with this slight variation, would you get the same results...
May25-14 05:23 PM
Thead
2 369
Why do parabolic reflectors for microwaves (e.g. satellite TV) not reflect light like a mirror? Why do things like...
May25-14 03:23 PM
oneamp
6 335
As we know there are charge on spherical shell then electrical field inside the shell will be zero. 1) If there is...
May25-14 02:09 PM
BOAS
3 365
What would be seen if a ball were projected at an angle to the horizontal in a falling elevator? Would the path be...
May25-14 09:15 AM
Doc Al
10 336
I am a discus thrower and a coach. It is clear that there are a number of physical attributes that make some throwers...
May25-14 09:01 AM
enorbet
11 507
"Resistors resist the passage of current through them." Then why the current through each resistor same in series...
May25-14 08:38 AM
UltrafastPED
1 364
How come that the current is equal on both the sides.The resistor should decrease the rate of flow of electrons i.e....
May25-14 07:49 AM
phinds
4 421
Could someone explain how angular velocity points perpendicular to the plane of rotation? I mean what is a physical...
May25-14 05:15 AM
my2cts
16 550
Would someone be willing to explain this? Here: http://www.physicsforums.com/showthread.php?t=487058 I read the...
May25-14 02:57 AM
BruceW
7 614
According to my experience, a sound coming from just one source will sound and feel louder than a sound coming from...
May24-14 10:57 PM
Bobbywhy
7 412
If you had a voltage v and wanted to know current, would the current be infinity ? Do we just call it 0 because it is...
May24-14 10:44 PM
nsaspook
29 805
Hello, this thought i'm having might be difficult to explain, but i will do my best. Ever since i learned about...
May24-14 07:47 PM
mfb
11 560
I can't seem to get my head around the difference between the two. Inertial mass appears in F=ma and is a measure of...
May24-14 06:48 PM
D H
38 2,976
Then what gives the energy to create this emf?
May24-14 01:47 PM
nsaspook
11 550
dear all, I am working on a problem about the vibration of a piezoelectric ring with electrodes on the upper and lower...
May24-14 05:54 AM
GregoryS
3 288
I know that this question may seem a bit weird at first glance, but i've been wondering about the following. Lets...
May24-14 05:52 AM
CWatters
11 452
To each other??? Repondez!
May24-14 12:22 AM
Simon Bridge
10 460
Two ways of cooling a (real) gas are exchanging heat or doing external work. Let's assume we have a fixed volume of...
May24-14 12:17 AM
rollingstein
15 508
So say you have a square loop of wire which has a current of some positive value going clockwise and it enters a...
May23-14 10:57 PM
Matterwave
10 307
When having a circular acceleration motion, we have both tangential acceleration and centripetal acceleration. The...
May23-14 09:39 PM
namanjain
3 258
If one large particle splits into two is that inelastic or elastic in terms of momentum?
May23-14 06:09 PM
Matterwave
2 275
Why does water get that shape when poured out of a glass, almost like the nodes and antinodes of standing waves in a...
May23-14 03:19 PM
Andy Resnick
5 560
I'm taking "physics for engineers" right now - the condensed 4 hour summer course over 7 weeks. I'm doing fine in...
May23-14 12:12 PM
jedishrfu
10 399
hello guys, i wanted to calculate inlet pressure of the pump( vaccum pressure). pump operates at 400 bar. pump works...
May23-14 11:26 AM
gmax137
1 307
I've been a bit confused about when/why an expanding gas cools. Here is what I've heard so far: Refrigeration...
May23-14 12:48 AM
CBHarding
18 975
This is my concept project, it stands for North American Superconductor Superhighway. I have alot of details...
May22-14 10:34 PM
Kyknoc
1 284
ok I have a working FFT I have test that... I just make a IFFT... and I added a FIR filter. so i am testing it ...
May22-14 08:06 PM
btb4198
13 440
what are the differences between plasma and ionized gas? Thanks
May22-14 02:10 PM
Salvador
4 385
I've been wondering this question for a long long time. In my world view, all energy is vibration/frequency/waves...
May22-14 11:55 AM
DrStupid
19 899
If a fluid is compressible, will the density be directly proportional to the pressure? (I'm sure there's a limit...
May22-14 08:16 AM
boneh3ad
8 391
Hello, I'm trying to size a motor for an application that I'm working on. The application involves winding...
May22-14 07:48 AM
tomizzo
3 337

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