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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,915 
Okay, so my friends and I went snow tubing recently where the track was as such:
_
..\
...\<hill ...

Jan2810 05:15 AM
willem2

11 
1,716 
Hi I hope someone can help.
I am working on a gear train with an electric motor which was burnt out and I'm trying...

Jan2510 07:34 AM
gmax137

3 
3,194 
The Earth rotates in inertial space. The amount of rotational kinetic energy is enormous ... millions of mankind's...

Jan2910 01:00 AM
jambaugh

15 
2,362 
I've been trying to search for this seminal paper on EM waves in stratified media. 'Investigations on the propagation...

Jan2510 08:58 AM
mahinda

2 
1,857 
Hi.
My English is not perfect but I'll try my best. This is not a homework. It's a programming question for my...

Jan2610 10:04 AM
DocZaius

7 
1,788 
I am trying to move water using a vacuum pump. I have a vacuum pump hooked up to a tank that has one inlet, one exit...

Jan2510 02:09 PM
gmax137

5 
8,003 
Hi,
I'm trying to take this Sellmeier equation,
n^2 (λ)=1+ (B_1 λ^2)/(λ^2C_1 )+(B_2 λ^2)/(λ^2C_2 )+(B_3...

Jan2510 11:33 AM
elect_eng

1 
2,761 
Hello.
I have a concern in relation to ray diagrams. So I read that the first incidence ray I draw must be parallel...

Jan2610 10:47 PM
cesiumfrog

1 
784 
I'm reading up on the equations for electromagnets, and in looking over the Wikipedia page on the subject I'm...

Jan2610 05:04 AM
bitrex

0 
2,906 
If the electric field at a point drops off in intensity as the inverse ratio of the square of distance from the...

Jan2610 05:59 AM
Born2bwire

1 
866 
Let us consider sound (longitudinal) wave
y=A.sin(\omegatkx)
See attachment for diagram
Consider air column...

Jan2710 02:03 AM
abhineetK

1 
1,712 
To resolve Gibbs paradox, Gibbs himself came up the idea to treat particles as indistinguishable. Since by then QM...

Jan3010 01:16 AM
DiamondGeezer

4 
1,404 
I am reading a paper that uses the term "spatial interference wavelength" and says its value for ice is (1.27 times...

Jan2610 01:56 PM
Ionito

0 
1,266 
Something has been bothering me recently regarding a diffusion problem. Consider a source of particles in a box,...

Jan2710 05:54 PM
Mapes

10 
823 
I'm currently working on a small classical simulation. Basically I have a plane of electrons reacting to a potential...

Jan2610 08:27 PM
Zeophlite

0 
531 
Hello all. I'm having trouble understanding why exactly it is that the simple work formula is defined both as change...

Jan2610 11:43 PM
russ_watters

1 
930 
i have been studying on lagrangian dynamics. and got stuck at some point. normally on the systems that include mass...

Jan2610 10:30 PM
moondra

0 
591 
hi, i have a question.
if electric field is 20V/m for a 10 V parallel plates potential difference of distance...

Jan2710 05:16 AM
quietrain

2 
617 
Hello everybody..
If a particle has a very small velocity.. (about 10 ^ 40 m/s) .. does it really move ?
or my...

Jan2710 01:28 PM
sylas

6 
1,371 
Hi,
Im currently working on a video game, and have come to an aspect that I'm very unsure about (I'm self taught in...

Jan2710 04:58 PM
rcrumb

13 
2,721 
Imagine a sphere such that positive charge is evenly distributed throughout one hemisphere (not just on the surface)...

Jan2810 11:39 AM
GRDixon

4 
778 
Hi, just to check which equation for Jd (the displacement current density) is correct:
1) Jd = ε0εr(dE/dt), or
2)...

Jan2710 04:39 PM
ryanwilk

2 
868 
Hey,
When dealing with convex mirrors I know that the image will always be virtual,upright and diminished. So when im...

Jan2810 05:01 AM
Doc Al

1 
1,018 
Hi,
My mind has been blown up recently when I came across this thread:...

Jan2810 05:53 PM
mikelepore

4 
1,539 
It just occured to me: when a travelling wave approaches a certain point in the medium, the point remains still. When...

Jan2910 02:52 PM
petermer

3 
910 
Hi everybody.
I am a mechanical engineer trying to do an electrical experiment.
I wonder if anybody can help me with...

Jan2810 07:07 PM
GRDixon

3 
4,670 
I know of the equations can be found here: http://hyperphysics.phyastr.gsu.edu/hbase/electric/engfie.html
And...

Jan2910 05:46 AM
torquil

3 
5,574 
This is going to be a very elementary question, but I am having a hard time wrapping my head around it for whatever...

Jan2810 05:56 PM
kbm

4 
3,643 
Hello all,
1) Does the universal gravitation law apply to every two particles in the universe, no matter how far...

Jan2910 11:16 AM
The legend

2 
883 
What formula would one use to solve for delta d with regards to t, v1, a1, and constant J?

Jan2810 11:38 PM
RobotGymnast

6 
4,218 
If there's no tail rotor, Will the body of helicopter naturally turn along with the main rotor (in the same direction)...

Jan2910 05:01 PM
Tregg Smith

6 
1,024 
Ok, to begin with my background is in electronics not physics or chemsitry, so please forgive me if I come across as...

Jan2910 11:54 PM
Born2bwire

3 
1,693 
I'm an HVAC engineer and my company has tasked me with researching a variety of water treatment products (for cooling...

Jan2910 11:59 AM
Bob S

4 
1,213 
I used to know this stuff. How fast will a rock be going after falling 5 seconds in a vacuum?
I'd also like to know...

Jan2910 06:45 PM
Pythagorean

3 
859 
I am confused about the KE = 1/2mv2
I was able to get v2=2as from it, by removing mass from each side you get as =...

Jan3010 10:15 AM
Doc Al

3 
858 
Here is a esoteric problem that is totally unique in nature: Taylor Glacier, in the Dry Valleys of Antarctica, hosts...

Jan2910 11:07 PM
Squatchmichae

0 
918 
If we have a resonator composed of 2 partially transmitting mirrors/grids and we excite the resonator from one end,...

Jan3010 06:07 AM
H_man

2 
1,075 
I am trying to get a "complete" picture of what happens in circuits. I know how to solve typical physics circuit...

Jan3010 12:35 PM
Climber

0 
1,953 
Hi PFians
I searched net for hours about understanding the concept of streamlines, streaklines and pathlines but I...

Jan3010 11:14 AM
R Power

3 
4,307 
2 plane waves do 1 slit diffraction, one comes perpendicularly to the slit, the other with an angle theta.
Rayleigh...

Jan3010 11:06 AM
ibc

0 
574 