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Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 48,282
Hello everyone, I have a question about conservative forces. I am given a function F = -kx^2 + ax^2 + bx^4, where...
Oct10-04 12:34 PM
MiGUi
5 3,167
When you define \vec F(\vec r) = \phi(r') (\vec r)/r Now U is usually denoted U(\vec r) = -\int_0^r \phi(r')...
Feb20-10 02:58 AM
Nusc
2 574
Why does work done by a conservative force = 0 in a closed path? I know this sounds foolish :uhh: but how can some...
May19-10 11:47 PM
vaibhav1803
5 1,637
Why is friction a non-conservative force ? It arises to Electric interactions which is a conservative force(field).
Dec18-11 04:50 PM
Bill_K
4 1,256
I have a general understanding of what a conservative force is. I am wondering if its possible to confuse a non...
May1-13 01:35 AM
Paintjunkie
0 471
I read in a book that if the constraint forces do work, the system is conservative, else it's nonconservative. In that...
Feb11-13 05:19 AM
mickybob
4 685
Is there an inconsistency between the definition of conserved charge and conserved current in Hamiltonian and...
Mar19-07 04:05 AM
da_willem
5 2,557
If one considers the Lagrangian of a non-relativistic particle in a gravitational field, L =...
Dec8-11 04:34 AM
haushofer
4 1,223
Hi all, I am preparing for my "second chance exam" in analytical mechanics. It is a graduate course i.e. based on...
Aug22-14 11:38 AM
samalkhaiat
2 246
I wonder whether Lagrangian has to have some symmetry if there exists a conserve quantity (reverse implication is...
Jan29-11 03:41 PM
paweld
0 893
So having been through translation and rotation I can conclude that my book has found 3 conserved quantities in...
Oct25-12 09:09 AM
Studiot
6 1,021
What is the role of Conserved quantities in physical system?
Nov4-09 12:02 PM
MaxwellsDemon
2 863
Consider the equilibrium situation on the picture attached. The wire supports a rod attached to an axle in the wall...
Dec15-11 07:19 PM
AlephZero
6 1,092
Hello! yes is from Sweden and my English is not good, but will try to do as best as possible. My question is: why...
Dec13-09 12:11 PM
aloshi
1 566
Hello there! In my last Electromagnetism lecture, the teacher explained that Newton's 3rd law doesn't work when we...
Apr27-04 03:36 PM
Feynmanfan
3 1,533
When considering electric field in a dielectric media,there are two forms of Gauss's law: \oint \vec{D}\cdot\vec{d...
Jul27-13 08:40 PM
Simon Bridge
13 695
sorry i didnt use latex..I tried...its annoying V=V(initial) + at....when you integrate both sides you get...
Sep16-04 06:55 PM
Doc Al
3 654
Hi, I hope it is a very simple mistake and easy to spot. Suppose you start at rest so initial velocity is 0 and you...
Sep25-11 08:37 PM
Ken G
7 1,753
Im wondering if somebody can show me how to derive the five equations used to solve these types of problems. Ive been...
Feb22-09 06:49 PM
cam875
2 1,728
Hi everyone, According to the equation Power = Force x Velocity or P = mav or a= P/mv, in order to keep say a...
Apr24-09 07:37 PM
rcgldr
22 5,108
Hi, I have another question on the center of mass this time. I read a problem in my university physics book by sears...
Aug17-04 09:36 PM
Cyrus
3 4,057
How do resistors of different resistances in series maintain constant current throughout a circuit? I mean is not the...
Sep3-10 12:15 PM
tasnim rahman
4 5,104
I do not know the exact electrochemical reactions which make a battery work, but I understand that the essential...
Apr29-12 08:30 AM
phinds
16 3,372
Dear All, Many thanks for reading this query. Actually, I am having problem in measuring the mode fields of Optical...
Nov11-11 08:47 AM
taimoortalpur
2 1,376
My book says that you can change the temperature of a substance at constant internal energy by changing only the...
Jul23-11 10:04 PM
gkangelexa
9 3,080
I'm programming a simple physics engine that works with rockets in space. I haven't done any physics since highschool...
Nov29-10 11:33 AM
JacksonMarks
8 1,225
Momentum of a body can be constant while it accelerates? I mean if velocity increases while mass decreases...
Apr5-14 01:36 AM
Michael_25
8 390
I have little confusion, we know that if Lagrangian is from from variable \theta then conjugate momenta P_{\theta} is...
Jun20-11 09:59 AM
vaibhavtewari
2 1,293
Hello all I encounter a difficulty solving most simple problem related to constant power and speed of particle the...
Mar30-05 02:09 AM
sAXIn
8 3,817
Can a thermodynamic system simultaneously exist under both constant volume and constant pressure at a particular...
Jun30-11 02:58 PM
nasu
4 1,827
It is said that in an isobaric expansion of a gas pressure remains constant throughout the expansion process. ...
Apr26-14 12:07 PM
Soumalya
14 640
hi ,this is my first post (and its not HW) i currently study dynamics of rigid bodies using (Hibbeler) and theres...
Dec11-10 05:39 PM
K^2
9 1,094
Assuming only air friction, do you think it is equally as energy efficient to reach a destination in a vehicle...
Apr23-11 11:45 AM
Dmytry
7 1,421
Hi there! I am working on a project that requires some idea of adiabatic processes. I know the basics of the said...
Jan6-13 01:21 AM
andrien
4 834
Hi, Does it make a difference if you use nitrogen gas or oxygen gas or hydrogen gas in the bulb ? Or they all give...
Oct24-13 03:24 PM
Philip Wood
2 488
Hello My story Till today, I had never imagined that the High Heat Value (HHV) of fuels or their Lower Heat Value...
Aug24-11 04:03 PM
lalbatros
0 1,627
In a question I tried to solved: "A house has well-insulated walls. It contains a volume of 100 m3 of air at 300 K....
Apr28-10 08:52 AM
HallsofIvy
5 2,615
why do most modern books claim the divergence of the E field is ρ/ε_{0} but in more classical books, and when you...
Aug1-12 03:01 AM
PhilDSP
5 832
Hey All, I realise this is a slightly peculiar question - but does anyone know if there is any conserved quantities...
Oct14-10 08:26 AM
thrillhouse86
0 806
By definition total energy of a system= (internal energy U) + K.E + P.E and mechanical energy of a system= (flow...
Apr29-12 01:14 AM
Ritz_physics
0 514

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