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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 46,017
Let's suppose i want to send a message over really big (interplanetary, maybe out of the solar system) distances. I...
T 01:08 PM
GTOM
26 1,041
What does p = mv really mean? For example, why is there a physical law based upon the product of mass and velocity?...
T 11:37 AM
vjacheslav
4 176
Hello. I'm having trouble with determining the dynamics of a rod, when one of the ends has a torque applied to it....
T 09:31 AM
Orodruin
13 138
Just a quick question. Let A and B be two points. Electrical work is defined as the amount of energy it takes to move...
T 09:29 AM
DeltaČ
16 218
Today I was taking the train to a nearby city, where we passed through some rainy region. As the raindrops fell on...
T 08:55 AM
Andy Resnick
3 331
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...
T 08:42 AM
Andy Resnick
3 235
Does all the light entering our eyes converge to a single point on the retina (assuming minimal aberration)? If this...
T 06:36 AM
ViolentCorpse
25 871
Hi, Just wanted to know the difference between permittivity and permeability. As far as I researched, permittivity...
T 04:10 AM
vanhees71
1 68
After studying the methods of Lagrange and Hamilton for a bit I still find myself uneasy about the action. I don't...
T 03:22 AM
vanhees71
4 136
If photons are oscillating electric and magnetic fields, then we should be able to deflect photons trajectories by...
T 02:19 AM
carrz
4 179
When studying about semiconductos what are the valence band and conductivity band .what are its properties,where is it...
T 12:06 AM
e.bar.goum
1 76
The following is my take on friction. I wish to verify if my hypothesis is correct. When trying to visualize...
Y 11:11 PM
Travis091
1 97
I have just completed reading an English translation (The Great Books version) of Newton's Principia and found it...
Y 12:18 PM
dkotschessaa
2 77
Hello. I saw this experiment: https://www.youtube.com/watch?v=hBQ8fh_Fp04 The light from laser is bending in small...
Y 09:24 AM
jtbell
3 95
Good morning PF, I am having some difficulty finding info on calculating a composite moment of inertia. The...
Y 07:20 AM
jamesm
7 526
Hi, I was wondering about the interpretation of the Hamilton Jaccobi equation. Naively we have H +...
Y 03:51 AM
vanhees71
1 185
What happens when charge enters the resistor?
Y 12:04 AM
kartikwat
6 186
Is there a mathematical relation for the temperature change when a fluid flows through a pipe from one end to another?...
Jul23-14 06:14 PM
Jay_
37 5,377
Consider a light, an L.E.D for example, turning on and off once per second. For humans, we will look at it and think...
Jul23-14 01:43 PM
rcgldr
4 219
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
6 326
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
2 164
Many of you are familiar with the catapult launched profile fuselage gliders that are sold in hobby stores. Since...
Jul23-14 08:18 AM
Simon Bridge
13 420
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
3 219
What is voltage and how to look at it intellectually?
Jul22-14 09:27 PM
jim hardy
30 1,975
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
4 321
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 1,006
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
6 302
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
6 296
We know that a steam power plant is basically a heat engine with steam as the working fluid. According to the...
Jul22-14 08:14 AM
enorbet
3 361
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.
7 398
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
1 231
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
1 214
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
2 213
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
17 797
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
1 226
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
3 315
Does anyone have a link to an experiment (preferably fairly modern) which either supports or falsifies Prevost's...
Jul21-14 07:10 AM
UltrafastPED
1 305
What are the physical interpretations of ##\mu_0## and ##\varepsilon_0##, the magnetic permeability and electric...
Jul21-14 04:52 AM
PhilDSP
7 367
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
6 364
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
4 314

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