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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.
Y 10:39 AM anorlunda 
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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...
Sep5-14 05:07 PM
DennisN
170 192,478
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 71,272
So the Debye-Gruneisen model seems to work quite well for most solids at low tempeartures, and in many cases at room...
Jul29-14 10:35 AM
earlscruggs
0 191
Hello (and sorry for this stupid question), Could someone tell me the name of this Hamiltonian H =...
Jul29-14 09:26 AM
kinichi
5 238
Hi,so I've just started reading the Feynman's Lectures on Physics on my own recently.By the end of chapter 2, volume...
Jul29-14 07:37 AM
mrhoneycinnamo
2 286
Why does "per" in 3 miles per hour mean division? Why are gradients and rates a ratio?
Jul29-14 04:52 AM
CWatters
3 224
why the meter bridge experiment not useful for the measurement of small resistance?
Jul29-14 03:36 AM
sophiecentaur
8 622
Hello everyone! I'm a civil engineering (bachelor) student, and I was fascinated by the "hydraulics" course....
Jul29-14 02:59 AM
Hardik Batra
1 198
Why the earth is rotating around the sun? I know the centripetal force is required for the rotation of earth around...
Jul29-14 01:08 AM
Student100
22 1,369
Hello everyone. I am a college graduate perusing independent research of my own. I'm trying to figure out how to...
Jul29-14 12:02 AM
berkeman
5 313
Hi, I have a thought experiment I'd like to share along with a couple of quotes. First, we consider the moment when...
Jul28-14 11:30 PM
berkeman
1 253
Hi, I have a question on a quote I saw from Steinmetz regarding the two components of eletric field (magnetic and...
Jul28-14 11:01 PM
Deco56
10 288
When I was in introductory physics I remember being told that the net force (gravitational for example) inside a shell...
Jul28-14 09:42 PM
Jd0g33
4 257
Hello, This is a quick question that I want to know, When an object falls, does the vertical falling speed stay...
Jul28-14 08:33 PM
Jd0g33
1 214
Imagine somewhere far within the solar system there was an exact copy of our solar system (Proportional). But the...
Jul28-14 08:24 PM
Pds3.14
4 205
This has been bugging me... We all know the classic problem about how the consuming ice water burns calories, although...
Jul28-14 07:05 PM
256bits
2 303
A co-worker recently shared an article with me that demonstrated a sound pulse traveling faster than c. After...
Jul28-14 04:51 PM
PapalPhysicist
5 241
Hello, Is spinning an object 360º horizontally a flip or a rotation? This is not homework, this is work work. ...
Jul28-14 04:28 PM
Nathanael
3 251
Hello i have a noobquestion: does a polymer ion battery lose capacity faster when charged and discharged at the same...
Jul28-14 02:03 PM
CWatters
7 427
Did the formula for velocity come from unitary method?
Jul28-14 09:13 AM
Doc Al
3 208
Hello everyone! I'm working on my practical project in college and it's roughly about ''air battery'' (CAES) which is...
Jul28-14 06:52 AM
stranger023
4 278
Hi all, I've recently learned some details about refractive indices in different media that I never knew about...
Jul28-14 01:21 AM
skate_nerd
15 553
I know a high school student who has this question. My first thought was that it does not hold if the mass is changing...
Jul28-14 12:49 AM
Jano L.
31 1,798
Why does the current across the cross section of an element, with perpendicular area vector ##d \vec{A}##, have a...
Jul27-14 11:07 PM
ehild
7 553
As we know Biot-Savart law follows right-hand rule, like this: ...
Jul27-14 10:02 PM
DaleSpam
9 1,531
In terms of structure
Jul27-14 05:14 PM
F=qE
2 296
I've heard terms like solid mass,or maybe still mass and I'm sure there are others so can I get a little education?
Jul27-14 12:47 PM
Natsirt
14 619
I'm planning to use some permanent magnets in a new kind of heat engine I designed. The properties I am seeking are: ...
Jul27-14 10:20 AM
TESL@
4 574
On first reading, the description of ‘group velocity ’ appears to be quite straightforward. However, I also found a...
Jul27-14 06:39 AM
olivermsun
16 1,787
Question : The top of the atmosphere is at about 400 kV with respect to the surface of the Earth, corresponding to...
Jul27-14 06:23 AM
NascentOxygen
1 337
From what I understand lightning works like a simple capacitor. The convection brings up moist air that by...
Jul26-14 11:14 PM
Somnolence
4 560
Hello I was just thinking about the Newton's law of gravitation and Einstein's theory of relativity. Newton's law...
Jul26-14 09:54 PM
carrz
14 843
From my reading various places online it seems that plastic recycling would benefit from a cheap and easy method for...
Jul26-14 09:15 PM
Evanish
3 556
Hello, I am using MATLAB to simulate a Fraunhofer diffraction pattern for a given aperture, but I have a little...
Jul26-14 06:21 PM
olivermsun
7 1,453
Hi I want to estimate divergence of water vapor flux in atmosphere with NCEP/NCAR data I have the equations for that...
Jul26-14 05:52 PM
b34n5
1 1,019
So flow rate is calculated using only the parallel velocity to the area vector. Why is this? How can I mathematically...
Jul26-14 04:14 PM
b34n5
2 496
When I sample a certain digital signal with increasing sampling frequency, the fast Fourier transform of the sampled...
Jul26-14 02:58 PM
DrGreg
2 377
Hi As I'm sure we're all aware, there are many planned missions to Mars. Given its distance (some 3 years away...
Jul26-14 01:52 PM
Nugatory
36 2,455
I am unable understand this Integral, what does it actually saying? What does that "δ" means here? I haven't learnt...
Jul26-14 12:51 PM
twoslit
2 468
Hi guys, I need some help with a sci-fi screenplay featuring very maneuverable hover cars. Past the maneuverability,...
Jul26-14 12:15 PM
twoslit
17 753
Hi! a very basic question that probably has a simple answer: would it be possible to trace a laser moving over a...
Jul26-14 12:12 PM
Nugatory
3 436
In theoretical physics, why is the mathematical model favored over the mechanical model? Awhile back, I posted a...
Jul26-14 07:14 AM
Vanadium 50
10 750

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