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

Apr2211 05:26 AM
ZapperZ

1 
47,793 
This is a short conceptual question.
If I place a heat sink in a sealed container, and than raise the ambient...

Sep610 06:18 PM
Dr Lotso'watts

4 
661 
Greetings everyone:
I am trying to create a software for estimating temperature for a liquid in a group of tanks...

Apr811 03:54 AM
sandeepbwes

0 
496 
In thermodynamics heat reservoir has a lot deegres of freedom. Can you tell me some examples of that deegres. Thx

Mar1912 11:35 PM
Andrew Mason

3 
772 
I was fascinated by the Wired article describing such an elegant engineering solution for remote data collection deep...

Feb2807 10:48 AM
russ_watters

4 
1,534 
See here:
http://www.physicsforums.com/showthread.php?t=299561
And:
...

Mar1409 06:18 PM
rcgldr

4 
1,076 
Living in the city, it seems that some jerk tries to merge right into my car on a daily basis during rush hour (i.e....

Jul1411 04:59 AM
rcgldr

5 
1,879 
Hallo everyone,
in electrostatic we have a linear realation between E D and P, i do understand that P
is related...

May1910 10:54 AM
Jano L.

15 
1,677 
This may seem obvious, but please define these for me, in as much details as possible.
What does it mean to:
...

Dec2411 12:45 PM
DaveC426913

16 
3,303 
Hi
I'm trying to define a Newtonian lagrangian in an
rotating reference frame (with no potential)
Something to...

Oct2209 12:55 AM
mtak0114

4 
4,751 
So I read somewhere that if we know u(s,v) i.e. internal energy as a function of entropy and specific volume, we can...

Dec913 01:43 PM
Jano L.

7 
671 
"Induction is a process of increment of charge such that the charge induced equals to the charge difference between...

May809 03:58 AM
dE_logics

5 
1,751 
I am designing an eddy current brake system for use in roller coaster design.
I have the flux density required to...

Mar2311 04:21 PM
os220

2 
1,905 
Electric field around a charge or system of charges is defined as the force experienced per unit charge. Won't the...

May3113 05:20 AM
Pushpam Singh

3 
600 
A block of mass m is resting on a frictionless surface and a push is given to it along the surface.
Now because of...

Aug1805 07:34 AM
HallsofIvy

2 
2,321 
Hello.
I have attached a file containing a detailed question regarding the definition of the electric current. I'll...

Apr2211 12:47 PM
AS28

2 
819 
Okay so I feel this is a bit of a weak first post in a forum but I haven't yet found a place for comment that wouldn't...

Nov2509 06:10 PM
cesiumfrog

3 
1,157 
We all know that the definition for work is
W = ∫F.ds
Why can't it be
W = ∫s.dF?

Jun811 02:23 AM
Studiot

9 
2,877 
I've been told (since high school I think) that "view angle" in a 2dimensional plane is approximately (distance to...

Jul2913 08:03 AM
Andy Resnick

6 
1,364 
Hello,
I have found the following definition in wikipedia:
A fluid is defined as a substance that continually...

Nov3008 01:25 PM
DaleSpam

2 
804 
0k i know net force on a body is defined as mass times acceleration of the body w.r.t inertial frame,
but how do we...

May1213 02:45 AM
tinytim

8 
592 
Wikipedia defines a quasistatic process as
"a thermodynamic process that happens infinitely slowly. However, it is...

Jul210 07:29 PM
Gordianus

6 
1,331 
I have seen a reversible process defined as one in which the system and surroundings are restored to their initial...

Mar3011 08:06 AM
Andrew Mason

9 
1,690 
In several text books I've read that treat classical thermodynamics, there is a theorem due to Carnot that is commonly...

Sep510 10:13 AM
jojo12345

0 
886 
In another thread, DH and I have been discussing the definition of an ideal gas. DH, who appears to be a physicist,...

Sep1513 07:30 PM
Chestermiller

6 
822 
Does anyone know how to derive the following:
\nabla x \vec{V} = k...

Jul809 02:39 PM
jeff1evesque

0 
583 
This is a very sound stupid question, but I'll go ahead anyway.
Current is defined as the displacement of charge...

Apr2013 03:34 AM
Nikitin

4 
646 
I am a bit confused about the definition of elastic collision.
What i have studied is, elastic collision is one in...

Jan811 05:51 AM
kalesony

19 
6,898 
I'm confused by the definition of electric current. It is commonly defined as the time rate of change of charge...

Apr1410 01:23 AM
annumarch

4 
2,205 
Hi,
I'm having some difficulty understanding the definition of an electric field.
When we define the electric...

Feb2908 12:40 AM
cepheid

9 
2,520 
I recently realized that I have never really seen a rigorous definition of the electric polarization field in matter...

Oct1707 10:46 AM
Meir Achuz

2 
14,285 
Hello, I just read on "Integrated electronics" by Millman the following definition:
"The potential V (volts) of...

Jul410 09:23 AM
Taturana

4 
3,235 
Everyone knows that the potential difference between two points 1 and 2 is given by \int_{1}^{2}{\vec{E}}\cdot...

Dec1610 11:44 PM
dgOnPhys

7 
4,185 
What is the definition of entropy of a thermodynamic irreversible process?
In the case of reversible process from...

Oct213 09:26 AM
Chestermiller

5 
1,125 
F=\frac{q1q2}{4\pi\epsilon_{0}}
If epsilon 0 was defined as the proportionality constant for this equation, why was...

Jun2910 02:56 AM
AJ Bentley

3 
7,140 
The total work is the same in all adiabatic processes between any two equilibrium states having the same kinetic and...

Nov1912 02:15 AM
DrDu

22 
1,951 
We have been working with Gibbs factors and the grand partition function in my thermodyamics class. There is an...

Mar1006 02:30 AM
eep

0 
2,346 
Okay, I'm confused and need someone smarter than me to explain something to me about Kinetic Energy.
In studying...

May610 07:17 PM
DaleSpam

9 
2,522 
I'm learning classical mechanics right now, and I have a question about the "initial definition" of the Lagrange...

Mar1204 12:54 PM
turin

10 
17,782 
When one finds the torque on a rectangular current loop one finds that it's equal to
\vec m \times \vec B
where...

Oct611 08:32 AM
center o bass

4 
1,305 
What is the physical meaning of each term in the parallelaxis theorem?
I=I com +Mh^2

Nov1211 09:49 PM
Duane

3 
2,335 