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

Apr2211 05:26 AM
ZapperZ

1 
41,704 
So far I have found a kinetictheory explanation of the Boyle's Law, Charle's Law, and PressureTemperature Law. For...

Sep412 11:24 AM
Philip Wood

4 
1,434 
Two concepts whose definitions are unclear to me:
1) Provide a fundamental operational definition for work done....

Mar2911 02:43 AM
Pythagorean

1 
943 
Gauss' shell theorem states that if given a spherical shell of charge such that the charge is uniformly distributed on...

May2211 04:24 PM
obafgkmrns

1 
1,149 
Now that I am making progress, I am ready to ask more complex questions :approve:
Please correct me where my...

Sep1612 01:39 AM
Bipolarity

5 
935 
I have for a while been trying to understand the setup of this equation in calculating the collision flux of a gas...

Sep1412 06:21 PM
Bipolarity

0 
1,077 
I believe I might have a fundamental misconception about work. Please correct me where my reasoning is wrong so I can...

Sep1512 07:13 AM
Andrew Mason

2 
742 
I am having some trouble understanding the significance of negative work.
If the work that I do on object X is W,...

Sep1412 10:10 PM
Crosstalk

3 
707 
I'm trying to consolidate my understanding of gas thermodynamics. If anywhere my reasoning is wrong, please correct...

Sep1612 09:24 PM
Andrew Mason

6 
1,392 
Unfortunately I still have not completely grasped the idea of negative work. I appreciate all the help in...

Sep1612 10:05 AM
Bipolarity

4 
579 
Suppose in a piston in which there is a gas, the gas exerts pressure P on surroundings, whereas the surrounding exerts...

Sep1912 08:26 AM
Chestermiller

24 
5,913 
C_{V} = \frac{∂U}{∂T}
This is the specific heat at constant volume so I assume it can only be used at constant...

Sep1912 08:09 PM
Chestermiller

5 
1,372 
http://www.pichem.net/images//reversibleadiabatic//adiabaticexpansion2.jpg
Evidently the adiabatic curve is...

Sep2912 06:29 AM
Chestermiller

27 
9,837 
Heat is defined as "the transfer of energy owing to a temperature difference between two bodies".
Consider a gas...

Sep3012 07:44 PM
Simon Bridge

12 
1,597 
For a reversible process, I imagine it is correct to say that
dS = \frac{dq}{T} where all quantities refer to...

Sep2812 01:41 AM
DrDu

1 
1,021 
According to my textbook, during an irreversible process, the entropy change of the surroundings is given by ...

Oct312 05:04 PM
Darwin123

9 
2,097 
I asked a question on this forum a few days ago about the entropy change of the surroundings, and am grateful for the...

Oct1012 10:13 AM
Andrew Mason

49 
2,952 
The Gibbs energy is used to determine the spontaneity of a thermodynamic process under isobaric conditions.
The...

Oct2612 07:30 PM
Dickfore

3 
738 
The escape velocity of an object on the surface of the Earth is the minimum speed required for it to "break free" from...

Mar2113 05:35 AM
tinytim

5 
671 
Suppose that a mass M1 is moving with speed V1 and collides with mass M2 which is initially at rest. After the elastic...

Apr813 03:24 PM
mfb

5 
969 
A basis for any 3dimensional vector space must have 3 vectors in it.
So the acceleration of any object in ℝ^{3}...

May213 02:54 PM
AlephZero

6 
637 
I am undergoing a product development as part of my full time business. I have forgotten a lot of the Physics I learnt...

Dec405 07:35 PM
bkelly

12 
16,565 
So this is the question...
In the direct circuit diagram below (please see the attached file), Resistors 1 and 3...

Feb2011 05:53 AM
Mark.R

5 
1,485 
Consider a freely rotating body. Let the axis of rotation be the zaxis. For simplicity assume all the mass of the...

Sep212 02:57 PM
birulami

1 
1,365 
Says Wikipedia: "The moment of inertia is a measure of an object's resistance to any change in its state of rotation"....

Sep212 09:46 AM
Simon Bridge

3 
584 
The photon is a electromagnetic wave and the electric as well as the magnetic part of the wave can be written as...

May2007 09:08 PM
Claude Bile

10 
1,686 
Let a bicycle run straight on a plane past you from left to right with constant speed. As a representative point of...

May2507 02:32 AM
daniel_i_l

6 
2,237 
Suppose I have N ideal particles in an enclosure, be it a ball or a cube or some other form. The particles shall...

Oct2910 03:24 PM
dgOnPhys

5 
865 
I would like to see how a bunch of point particles evolve given equations describing their velocities and, possibly,...

Nov210 03:57 PM
birulami

0 
662 
I am reading the book of Neuenschwander about Noether's Theorem. He explains the EulerLagrange equations by starting...

Nov412 10:44 AM
vanhees71

1 
606 
Reading about the Lagrangian and conservation laws, I was wondering if, given the conservation law
\dot{x(t)} =...

May2112 12:25 AM
birulami

4 
766 
I can't figure out what is the motion of a charged particle at rest at origin in a constant uniform magnetic field...

Oct211 02:25 PM
jfy4

3 
1,409 
Hi,
I am stumped by how to expand/prove the following identity,
\{L_i ,L_j\}=\epsilon_{ijk} L_k
I am feeling...

Jun611 04:10 PM
vanhees71

3 
992 
Hi everyone,
I am new to the physics forum. I have been trying to find out relationship between the heat loss by a...

Feb1710 03:04 PM
bisseychor

0 
3,764 
when an AC passes through a capacitor,if the expression for alternating voltage is V=E×Sinωτ,the expression for...

Sep313 01:21 PM
vanhees71

15 
722 
gauss's theorem is also applicable to charge in motion.but how the surface integral has to be taken??

Sep1813 07:23 AM
BruceW

7 
511 
I have a question about the behavior of a charged particle being accelerated in an electric field. I know that it is...

Sep509 03:56 PM
bitrex

4 
2,429 
I have a question regarding the similarity between the BiotSavart law and the equation that gives the magnetic field...

Nov2209 05:37 PM
bitrex

0 
470 
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 
2,737 
Hey,
I'm sure you are all familiar with the experiment where you take a glass of water , put a some seal on it and...

Dec412 04:43 PM
Nugatory

1 
537 
Problem: A nuclear generator produces energy used to accelerate a rocket. Given energy and mass, what is the...

Aug2113 11:09 PM
eigenperson

2 
482 