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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
1 46,618
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
6 507
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
3 592
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
7 626
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
1 411
Why the torque is called moment of force and angular momentum is called moment of linear momentum ? Please explain.
Jul21-14 09:12 PM
1 395
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
2 416
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
17 1,142
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
1 416
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
3 547
Does anyone have a link to an experiment (preferably fairly modern) which either supports or falsifies Prevost's...
Jul21-14 07:10 AM
1 528
What are the physical interpretations of ##\mu_0## and ##\varepsilon_0##, the magnetic permeability and electric...
Jul21-14 04:52 AM
7 583
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
6 588
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
4 497
Hi experts! Im new in this forum. Im studying a cylinder of radius (A) very small compared to its length (L)....
Jul20-14 02:30 PM
0 395
Of course I am sure this is not a paradox but rather a problem in my understanding of the situation. But this...
Jul20-14 02:29 PM
23 1,189
hi guys I am attempting to solve a problem that has me scratching my head. I have a small connector PCB with one...
Jul20-14 03:33 AM
1 494
Hello. I have two simple questions. 1) I don't understand atmospheric force. I read that it occurs by heaviness of...
Jul20-14 01:39 AM
2 910
I am trying to understand the Coriolis effect from some time but i am unable to conceive the idea why the air parcel...
Jul19-14 12:05 PM
Arfur Bryant
16 1,169
I have a doubt that can we increase the intensity of light without changing its amplitude and by increasing its...
Jul19-14 08:48 AM
Claude Bile
4 888
Hello again, My handy optics engineer has left the country leaving me with a problem that's over my head. I need...
Jul19-14 08:42 AM
Claude Bile
5 1,139
This question has been asked probably many times, and is inspired by area that appears in denominator of energy flux...
Jul19-14 07:40 AM
35 4,700
If I have 10m lever with a center of the mass 2m from the right side it must mean the shorter arm have greater mass to...
Jul19-14 12:13 AM
Simon Bridge
1 677
Hello PF! This is my first post in a while, and I am pretty excited to hear what you guys think about my idea. I...
Jul18-14 01:36 PM
2 610
How does one think about, and apply, in the classical mechanical Hamiltonian formalism? From the Lagrangian...
Jul18-14 11:44 AM
0 604
For an IP67 rating (, an electrical enclosure must be submerged to 1m for 30...
Jul18-14 09:25 AM
1 579
I was wondering if somebody could let me know if wings inside of a closed environment (tube of sorts) with air flowing...
Jul18-14 07:26 AM
4 735
Hello. Have you ever seen this experiment? OK, i know why does the...
Jul18-14 04:52 AM
2 1,127
Hello so I just want to make sure I Am doing this correctly. also I know there is a magnetic field force formula....
Jul18-14 02:17 AM
6 1,061
I am well aware that objects of varying masses, shapes, and surface areas will fall at different speeds and...
Jul17-14 05:51 PM
Cosmic Al
4 1,175
Does Young's Modulus change with drastic changes in size? For example, suppose you exert a force on the micro scale or...
Jul17-14 12:58 PM
Philip Wood
5 922
I am somewhat confused about the connection between divergence and solid angle for a beam. I know individually what...
Jul17-14 08:26 AM
13 1,109
I noticed this intriguing phenomena whilst messing about in work with a perfect glass hemisphere the other day: ...
Jul17-14 07:13 AM
2 789
Does "work done" actually have any real meaningful sense or value? I've got no problem with "work done" when moving...
Jul17-14 12:53 AM
5 984
what is the reason of soft x-rays, Is it because when a accelerated electron approaches an atom the electrons'...
Jul16-14 09:43 PM
15 1,416
Hello everyone, I'm studying the finite strain theory and have come across the maximum dissipation principle. It...
Jul16-14 08:09 PM
3 1,448
Hi, I am a bit confused about what exactly is being produced when someone uses a hand generator. I know P=R(I^2). ...
Jul16-14 07:14 PM
3 696
Hi all, I've been reading about biconvex lenses, drawing ray diagrams and real/virtual images. I'm now trying to...
Jul16-14 03:11 PM
2 1,048
Will a Venturi tube with the entry open to a moving fluid act the same as one that has a closed entry with a known...
Jul16-14 10:54 AM
Bob Shapiro
0 673
Suppose the particle is at distance x from mean position and moving away . The standard formula for calculating...
Jul16-14 08:24 AM
32 2,452
Hello everybody. I registered today in this forum and this is my first post. I'm Italian, therefore sorry for my...
Jul15-14 10:41 PM
Cosmic Al
13 1,419

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