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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 47,691
Hi Folks, Why does a parachutist experience 0g (assuming falling in a vacuum, no drag) when falling towards the...
Aug12-14 06:11 AM
Lsos
4 267
I'm trying to understand the kinematic equations well enough to explain to someone else, but the analogies I've come...
Aug12-14 02:14 AM
haruspex
3 169
Hi everyone, A couple of question I was thinking about regarding sound: 1) A sound source is moving at the speed...
Aug11-14 07:34 PM
billy_joule
6 271
I am not sure if this question even makes any sense, it just popped in my mind while reading a book on special...
Aug11-14 02:50 PM
Orodruin
37 771
Hi all, I've got a quick clarification question. Generally when the production of electromagnetic waves are...
Aug11-14 02:34 PM
DaleSpam
2 147
I don't really understand what is the need of giving feedback in the magnetostriction method to produce ultrasonic...
Aug11-14 01:27 PM
smart_worker
2 249
Hello, in Schwartz's QFT-book it says that: "Classically, a box of size L supports standing electromagnetic waves...
Aug11-14 11:10 AM
branch
0 173
Before you go through all the trouble of reading all this back story the real information is towards the bottom...
Aug11-14 08:35 AM
A.T.
17 326
TIR (total internal reflection) is the most common way of producing evanescent wave, e.g. TIR fluorescence microscopy....
Aug11-14 05:34 AM
iuvenes
0 207
Just wondering, in order to polarize a light beam with a wire grid you could also get some difraction in despite of...
Aug10-14 08:22 PM
namati
2 177
I am confused with the wording for a static friction problem; this particular wording also lead me to a conceptual...
Aug10-14 09:16 AM
KatamariDamacy
13 288
I'd like some help to understand how to calculate "lost work" for irreversible heat transfer across a finite...
Aug10-14 02:56 AM
PatrickAndrews
12 389
I've been looking into electromagnet design and there is a certain principle/set of equations that are bothering me......
Aug9-14 10:57 PM
Simon Bridge
5 309
Folks, I am having difficulty correctly representing a mechanical system within a correct "control volume at an...
Aug9-14 03:14 PM
bugatti79
7 249
$$\vec{F}=q\vec{v}\times\vec{B}$$ $$\frac{d\vec{F}}{dq}=\vec{v}\times\vec{B}$$ $$\int\frac{d\vec{F}}{dq} \cdot...
Aug9-14 12:20 PM
iScience
1 225
Coming from a Chemistry background, we seem to flippantly explain away chemical phenomena using "Coulomb's Law" but...
Aug9-14 05:24 AM
DeltaČ
7 283
I managed to confuse myself with a simple thought experiment. I have a space ship that uses mechanical springs...
Aug8-14 05:16 AM
fulis
2 213
I need to do something for a project. Basically, I need to be able to project a clear image onto a mirror while still...
Aug8-14 03:53 AM
sophiecentaur
7 242
I am working on making an aluminum truck bed cover for a customer despite my attempts to pass it up, he insists that i...
Aug7-14 06:59 PM
Metal Man
30 681
What is the minimum speed at which electrons can be emitted? Why is it I never heard of really slow moving electrons,...
Aug7-14 04:47 PM
Nugatory
27 632
Hi everybody, I encountered this question as an example of what a google applicant is asked: You are shrunk to...
Aug7-14 03:06 PM
A.T.
8 269
I'm having some difficulty setting up a problem. I'm trying to model the temperature of a thermistor connected to a...
Aug7-14 11:09 AM
16universes
32 621
I had an interesting thought regarding the "arrow of time" and, with the hope of getting the opinion of someone...
Aug7-14 07:03 AM
Philip Wood
8 339
Hi I had a question based on inertia if two balls one heavy and one light are on a bus which is moving with...
Aug7-14 06:06 AM
sophiecentaur
16 421
Please confirm & answer the following: An atom exposed to an external B-field will experience both a torque on its...
Aug6-14 09:45 PM
256bits
1 217
I would like to know if there is any proof as to whether the moment of inertia for two bodies (the masses of each body...
Aug6-14 07:12 AM
sophiecentaur
6 259
Suppose a point charge is accelerating uniformly. It emits EM radiation. If an observer is co-moving with the point...
Aug6-14 03:41 AM
vanhees71
5 272
Can a magnetization density that is compactly supported be the gradient of a scalar field? This question relates to...
Aug6-14 03:35 AM
vanhees71
4 218
I am trying to calculate heat transfer from an inclined flat plate under free convection conditions. I am referring to...
Aug5-14 02:08 PM
jlefevre76
6 220
What does p = mv really mean? For example, why is there a physical law based upon the product of mass and velocity?...
Aug5-14 01:43 PM
olivermsun
57 1,769
Hello Forum, The 1D harmonic oscillator is an important model of a system that oscillates periodically and...
Aug4-14 09:59 PM
Simon Bridge
13 357
Hello, I'm building a model train control system, and would like to use real world values and physics to control the...
Aug4-14 06:37 PM
KaiGrid
6 219
Two questions: 1.) Consider a hollow conductive sphere that's initially charged. These charges will distribute...
Aug4-14 02:57 PM
iScience
2 379
See, we know that different electrical appliances in our house require different amount current to work .now first if...
Aug4-14 02:41 PM
CWatters
9 301
Question about moments and torques. I understand that torque is defined as τ=Fs and understand where this comes...
Aug4-14 02:17 PM
CWatters
2 214
If I have ice, water and vapour at the triple point and they are in equilibrium at a temperature of 273.16. Does this...
Aug4-14 09:42 AM
vjacheslav
3 213
I have read that electric field inside a cavity of irregular conducting surface having any charge is zero.how is this...
Aug4-14 09:07 AM
Nugatory
3 193
What is the potential of Earth with respect to (wrt) infinity (C=710uF)? I am assuming that infinity is the correct...
Aug3-14 06:21 PM
DaleSpam
1 193
Whay is it that when we release air from our mouth when it is little open then the cold air is released but when we...
Aug2-14 06:58 PM
A.T.
7 305
I have some questions about electrons flow. 1)Lets say we have a simple circuit with a metal wire and a battery...
Aug2-14 11:10 AM
voko
7 348

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