
Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
48,261 
I read about experiments that modeled blackholes as a liquid passing through a lavel valve at supersonic speed, the...

Jul706 11:10 AM
Andrew Mason

1 
2,270 
Suppose you have a weight hanging from a rubber band and you heat up the rubber band, will the weight go up or down? ...

Nov2406 08:45 AM
Danger

5 
5,718 
Lets say you have a plastic plate with little charged balls around the edge. in the middle there's a coil with a...

Dec2006 01:02 PM
jtbell

7 
2,584 
Here's something that i've been thinking about a while and haven't found a good answer to:
Lets say that there're two...

Feb707 05:14 PM
Meir Achuz

9 
2,495 
Lets say that I know the inertia tensors for a few different 3D shapes and I want to connect them together into one...

Apr609 05:45 PM
daniel_i_l

2 
2,723 
Hi,
I'm sorry and hope this forum allows people who don't study but are interested in physics to post their primitive...

Oct2513 04:38 AM
hilbert2

5 
633 
I'm trying to solve a problem that came to me using a numerical method.
I'm gonna put it here.
Using the moment...

Dec2909 08:58 AM
Born2bwire

16 
1,917 
For a personal project, I am analysing the physics in the Source video game engine and comparing it with real life.
...

May310 10:58 AM
LostConjugate

5 
3,193 
Hi, all:
I need to do some study which involves the transformation of EM fields from the rest frame to the rotational...

Sep2308 02:29 PM
danjan1234

0 
2,566 
Well we know guys that the Earth spins to the east. So i was thinking, if you launch projectiles (lets say golf balls)...

May809 09:48 AM
D H

34 
6,043 
Can anyonewe suggest an extended essay project for me in physics. I am a grade 11 student in physics and want to do my...

Mar708 02:13 PM
Andy Resnick

2 
7,037 
Just a question about heating compressed air..
I know generally how hot air works.. You heat it and particles...

Jan209 04:56 PM
dankelly08

3 
1,383 
I have two somewhat related questions.
First, why would we care about the Lagrangian L = T  V (or K  U)? I...

Jun2712 07:26 PM
Cleonis

15 
3,399 
There was a heated argument at my workplace today on what could drive a golf ball farther, a baseball bat or a golf...

Dec504 10:59 AM
Physics is Phun

8 
5,452 
IF a phase touches another phase in a 3 phase AC supply it goes bang due to them being 120 degrees apart and therefore...

Aug2810 10:55 AM
zgozvrm

4 
5,190 
Hi, if you have the book: Physics for Scientists and Engineers 8E, Serway Jewett
On page 675 (Chapter 23), Example...

Sep1011 08:48 AM
sweet springs

2 
1,159 
I'm having a research topic regarding wave train problem, i read from the book stating that phaseshift could probably...

Aug3009 01:02 PM
danong

0 
416 
I'm seeking help in understanding KirchoffHelmholtz Integral.
Actually what i am facing the problem here is,
i...

Nov209 11:25 PM
danong

0 
898 
Hi All  If I have a potential energy surface with two energy states, one higher than the other, where I can make the...

Apr1609 07:45 AM
DanPhysChem

1 
750 
I am walking at 2 metre/sec and light, from a flashlight behind me, is moving at 1 m/s.
So my eyeballs are catching...

Jun1711 03:37 PM
danR

6 
1,126 
In a rather popular (probably because of the progressively hypnotic music) viral video, often just called 'the bullet...

Nov911 07:49 AM
Ken G

13 
1,883 
This is a very quick question but in the equation
e=1Q_{C}/Q_{H}
do we treat both Q's as positive even though...

Apr1410 10:01 AM
AYANTAYO

5 
1,353 
Hello,
I'm looking for some feedback on and an analysis of a spreadsheet calculator I've made.
It looks at...

Mar412 10:08 AM
dansphere

1 
1,304 
Hey guys, I'm not sure if this is the right place, but I'm trying to use mathematica to model a vortex. I think I...

Apr2613 11:24 AM
Dante Tufano

0 
505 
I have a question about the em explanation of radiation pressure.
As I understand it, when an em wave with low...

May2310 09:16 AM
dan_b_

2 
1,500 
Hello, fellow Physicians! Wait, that's not right. . .
Anyways, I've been teaching myself a little about resonance...

Mar513 01:57 AM
BeBattey

4 
911 
Hi all,
I'm working with the heat capacities definition and I have got a confusion. I don't understand why we can...

Jan2812 03:52 PM
dapias09

5 
1,669 
Hello all,
I'm confused with the center of mass concept. Regard the following problem, we have a spring with...

Feb512 12:37 PM
James_Harford

3 
1,194 
Hi,
can anyone help me to understand why the pressure of a ideal solid is zero?. In my class we calculated this in...

Apr1412 03:17 PM
dapias09

0 
747 
Hi all,
Can anyone explain me why the ratio Cp/Cv is infinite for a photon gas?
Thank you in advance.
Diego.

Jun412 12:12 PM
dapias09

0 
1,022 
Hi all,
what do you understand by a hardpoint gas?, I mean in terms of its hamiltonian.
Thanks in advance.

Aug1813 05:10 PM
Jorriss

3 
344 
Hi guys,
I would like to know if the answer given to this thread is correct
...

Sep1513 10:45 AM
dapias09

4 
543 
Hi guys,
I've got a doubt concerning to the minimum mechanical work and the workenergy theorem. Consider the...

Nov2713 03:06 PM
dapias09

2 
658 
Hi guys,
In a scientific paper, I have found the following sentence:
"...given the fact that the system is...

Mar1114 04:48 PM
UltrafastPED

3 
272 
uhm, can somebody help me about this subject? i find it very hard. i'm using foundations of statistical and thermal...

Sep1207 09:59 AM
dareymon

0 
1,504 
Hi . I am making a robot that is supposed to detect a red ball with a camera, and then know where the ball is .
The...

Jul711 06:23 AM
Born2bwire

4 
3,123 
Hi there, does any of you know a place where I can find the derivation of the hydrodynamic equations (navier stokes,...

Jun112 11:38 AM
Andy Resnick

2 
924 
When I was a kid listening to a transistor radio under my pillow late at night I used to wonder whether turning the...

Oct111 06:24 PM
vk6kro

2 
1,000 
The power generated from the aerogenerator is from the kinetic energy of the wind which pass throught it. So, after...

Aug2904 10:30 AM
Clausius2

20 
4,369 
The situation is there is a ball attached to a string in a car, and the angle that the string makes is measured when...

Nov611 02:15 PM
DarkBlitz

2 
2,084 