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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 48,268
After studying the methods of Lagrange and Hamilton for a bit I still find myself uneasy about the action. I don't...
Jul28-14 06:24 PM
Delta Kilo
16 824
How earth is considered to inertial frame of reference?
Jul28-14 04:20 PM
olivermsun
3 273
Hello, In an electric circuit, let's say we have a resistor and a generator(Voltage source). The electric field...
Jul28-14 05:59 AM
tonyjk
22 854
The following is my take on friction. I wish to verify if my hypothesis is correct. When trying to visualize...
Jul27-14 11:24 PM
DeltaČ
7 648
Are there any experiments or theories about the relation between magnetic dipole moment orientation and velocity...
Jul27-14 08:02 PM
carrz
4 391
Hello, everyone. I saw this experiment: https://www.youtube.com/watch?v=klt9PNuqMC8 A man is doing experiment with...
Jul27-14 04:32 PM
davenn
1 265
Just a quick question. Let A and B be two points. Electrical work is defined as the amount of energy it takes to move...
Jul27-14 01:10 PM
FallenLeibniz
17 729
Two part inquiry PART I Situation: I have a B-field and i'm pulling a straight piece of wire through that...
Jul26-14 07:38 PM
iScience
2 344
Does all the light entering our eyes converge to a single point on the retina (assuming minimal aberration)? If this...
Jul26-14 10:14 AM
ViolentCorpse
27 2,106
Hello everyone, I was wondering how one would calculate the three-dimensional charge density (per volume) in a...
Jul25-14 09:32 PM
Born2bwire
3 450
Let's suppose i want to send a message over really big (interplanetary, maybe out of the solar system) distances. I...
Jul25-14 01:08 PM
GTOM
26 1,625
Hello. I'm having trouble with determining the dynamics of a rod, when one of the ends has a torque applied to it....
Jul25-14 09:31 AM
Orodruin
13 533
Today I was taking the train to a nearby city, where we passed through some rainy region. As the raindrops fell on...
Jul25-14 08:55 AM
Andy Resnick
3 822
Why is it that the width of a wire grid polarizer has to be less than the wavelength of the wave which I want to...
Jul25-14 08:42 AM
Andy Resnick
3 696
Hi, Just wanted to know the difference between permittivity and permeability. As far as I researched, permittivity...
Jul25-14 04:10 AM
vanhees71
1 351
If photons are oscillating electric and magnetic fields, then we should be able to deflect photons trajectories by...
Jul25-14 02:19 AM
carrz
4 639
When studying about semiconductos what are the valence band and conductivity band .what are its properties,where is it...
Jul25-14 12:06 AM
e.bar.goum
1 404
I have just completed reading an English translation (The Great Books version) of Newton's Principia and found it...
Jul24-14 12:18 PM
dkotschessaa
2 416
Hello. I saw this experiment: https://www.youtube.com/watch?v=hBQ8fh_Fp04 The light from laser is bending in small...
Jul24-14 09:24 AM
jtbell
3 486
Good morning PF, I am having some difficulty finding info on calculating a composite moment of inertia. The...
Jul24-14 07:20 AM
jamesm
7 1,190
Hi, I was wondering about the interpretation of the Hamilton Jaccobi equation. Naively we have H +...
Jul24-14 03:51 AM
vanhees71
1 573
What happens when charge enters the resistor?
Jul24-14 12:04 AM
kartikwat
6 648
I'm stuck on some highschool physics, Gauss law... 1. It says this: The electric field outside the sphere is equal...
Jul23-14 10:57 AM
Satvik Pandey
6 818
This is a question we were asked quite some time ago: Consider a circuit shaped as a rectangle, with two very long...
Jul23-14 09:26 AM
Nugatory
2 557
There is a silly detail about the interpretation of the Van der Waals (VDW) equation that I cannot fully understand....
Jul23-14 07:51 AM
atyy
3 611
I want to describe the motion of a ball that rolls without slipping in a plane where acts a force field not in the...
Jul22-14 03:54 PM
jaumzaum
4 790
Hello, It is my understanding that a moving magnetic can induce an electrical current, and that conversely, and...
Jul22-14 01:19 PM
Tord
3 1,706
Consider a circular loop of radius R that carrys a uniform current I. We know(by Biot-Savart law) that the magnetic...
Jul22-14 09:01 AM
vanhees71
6 750
I was wondering why is there a minus sign in the equation: EMF= -d(flux)/dt If this equations is derived from a...
Jul22-14 08:59 AM
vanhees71
6 787
Let me set the stage for a thought experiment. 1. A physicist in an elevator at some arbitrary height above Earth...
Jul22-14 05:05 AM
A.T.
7 884
Hi, can someone please help me on this problem. I'm not sure what to do with the equation given. I tried taking the...
Jul21-14 09:20 PM
Matterwave
1 587
Why the torque is called moment of force and angular momentum is called moment of linear momentum ? Please explain.
Jul21-14 09:12 PM
Matterwave
1 567
What is meant by moment of particles ? Why the algebraic sum of moments of all particles about centre of mass must be...
Jul21-14 09:10 PM
UltrafastPED
2 580
When I fire a gun there is an explosion inside a barrel that causes bullet to fly and gun to recoil but when a barrel...
Jul21-14 05:32 PM
enorbet
17 1,555
Hello, Someone could explain me why in the derivation below the mass m is divided by 2 in the last step?: ...
Jul21-14 03:01 PM
jbriggs444
1 578
Hello, I know that the latent heat of a first-order isothermal and isobaric phase transition is in general given by...
Jul21-14 10:24 AM
g_mogni
3 754
Does anyone have a link to an experiment (preferably fairly modern) which either supports or falsifies Prevost's...
Jul21-14 07:10 AM
UltrafastPED
1 719
What are the physical interpretations of ##\mu_0## and ##\varepsilon_0##, the magnetic permeability and electric...
Jul21-14 04:52 AM
PhilDSP
7 783
For a glider to sustain flight at a constant speed, the aircraft must be placed in a dive so that the forward motion...
Jul21-14 02:39 AM
CWatters
6 805
I'm having a brain fart so this is just another silly question but... when deriving the I-V relation for the...
Jul21-14 01:59 AM
iScience
4 683

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