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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 47,680
Hi, my question is about determining the damping ratio for the upper spring-damper part of the system given in the...
Dec1-09 12:11 PM
SystemTheory
1 2,771
I have a transfer function for system. 23.23*s + 1.421 ------------------------------------- = tf s^2 + 25.88*s +...
Jul10-10 10:02 AM
stevenb
2 2,844
Typically photon attenuation is determined by the equation I = I_0 \cdot e^{ - (\mu \cdot z)}. The variable mu is...
Sep8-05 03:57 PM
ehild
5 1,091
I've got data that's force (g) against time for an SDOF system (with a bit of noise). The main thing I'm interested in...
Nov8-11 07:14 AM
AlephZero
1 1,282
Hello All, I have some basic damping related questions that I am hoping you all can shed some light on or suggest...
Nov6-12 03:44 AM
K^2
5 897
Unfortunately, magnetic fields are by their nature invisible, but scientists from NASA’s Space Sciences Laboratory...
Jun3-08 11:37 PM
SF
2 1,556
Today I was outside to get some grass for my rabbit. I took some yellow dandelions too, but as I entered the elevator...
Apr13-08 06:39 AM
Tachyonie
3 1,577
hi, recently i notice that there is a dark border around all the streetlight at night. what is this phenomenon...
Feb11-14 05:55 AM
Simon Bridge
2 204
I am doing a lab for my optics class. My group has chosen to set up a simple dark field imaging device using a HeNe...
Mar11-09 07:47 AM
Andy Resnick
1 827
I was working on some dark field filters and I was wondering if you could substitute the black spot in the centre of a...
Apr7-09 06:28 PM
Andy Resnick
3 936
Hi, I've been doing Fraunhofer diffraction and I have been getting dark spots in the middle if my patterns, not...
May6-11 08:37 PM
Redbelly98
3 819
Hi Everyone, I am trying to calculate the exit velocity of a dart which is propelled by compressed air. Please see...
May23-12 06:38 AM
haruspex
1 931
does dB increases when voltage increases?can sum1 state or declare a formula or proof?
Feb25-10 12:53 PM
Bob S
1 1,997
DC doesn't cause electromagnetism? That is what our teacher says. Can anyone explain why it doesn't? As far I remember...
Nov11-09 02:59 PM
Dadface
11 1,341
To increase a DC generator's turning effect, we increase the number of turns of the coil. How does this increase the...
Sep29-12 04:51 PM
Philip Wood
1 1,331
Hi, I have a question related to the DC motor that i hope you geniuses can help me with. By Fleming's Left hand...
Sep23-12 12:58 PM
sgstudent
6 874
Another intersting point on home electronics raised was - why does every device you purchase have it's own...
May13-05 03:40 PM
zoobyshoe
39 3,412
hello , DC (I guess AC too) power supplies have 3 terminals: plus, ground, minus. If I set the voltage to 30...
Sep28-08 12:03 AM
Phrak
3 9,053
Hello, can someone please help me out here, i want to step up the voltage of a 1.5V battery to 300V, i know that to do...
Dec12-07 03:53 PM
alvaros
1 1,785
de broglie wavelenth of a perticle approaches zero faster than 1/v as its speed approaches the speed of light..how can...
Oct8-09 02:02 PM
hasanhabibul
0 594
In order to understand about De-Broglie's explanation on Bohr's second postulate,concept of standing waves should be...
Apr18-13 07:23 AM
Philip Wood
2 1,029
My textbook says that dE-TdS+PdV<0 for all irreversible processes. However, for reversible processes, the author says...
Jul12-12 10:54 AM
Studiot
21 1,278
Are elemental particles subject to entropy? Are there dead electrons "no spin".
Dec7-11 03:18 PM
mathman
6 1,264
The no-slip boundary value constraint for Navier-Stokes solutions was explained in my fluid dynamics class as a...
Apr30-12 09:33 AM
Andy Resnick
1 1,039
Hi, I've been trying to figure out a formula which describes the relation between the area, load and negative psig...
Jul20-07 12:29 PM
deimors
2 1,444
Firstly, I'd like to announce that this is not a homework question, it is an example of a problem I thought up to...
Apr10-09 04:24 PM
arildno
3 2,039
My question is what causes death wobble? Let me explain more... The vehicle I've experienced this on is a Jeep with...
Aug22-09 04:03 AM
rcgldr
19 16,010
Helloooo. I'm debating a creationist and he consistently is bringing up the laws of thermodynamics to try and 'prove'...
Jan4-06 08:03 AM
Doc Al
17 2,944
Just a question: I do know it is possible to have a debye layer in a electrolyte. But is it posible to have a Debye...
Jul15-06 12:24 AM
Clausius2
2 4,880
Hello, I am new here. I was reading Wangsness electromagnetic fields and he delves into a short discussion about...
Aug15-14 07:14 PM
Greg Bernhardt
1 251
Hello, Here's my challenge: I want a physics model for how one would go about in order to decay the moon's orbit....
Dec2-13 09:45 AM
BruceW
10 1,176
Ok, so I was doing this problem, *NOT* a homework problem, where I was solving for the force (and eventually, the...
Jun13-10 06:05 PM
russ_watters
2 2,579
Hi there, sorry for asking a question as my first post instead of contributing to the community however I have a...
Jun8-13 04:21 PM
Aero_UoP
4 1,409
I posted a question as thus : A train moving at 100 km/hr uniformly decelerates at a rate of 10 km/hr each hr. How...
May5-07 09:13 AM
ZapperZ
7 1,640
A basis for any 3-dimensional vector space must have 3 vectors in it. So the acceleration of any object in ℝ^{3}...
May2-13 02:54 PM
AlephZero
6 752
This is a short conceptual question. If I place a heat sink in a sealed container, and than raise the ambient...
Sep6-10 06:18 PM
Dr Lots-o'watts
4 660
Greetings everyone: I am trying to create a software for estimating temperature for a liquid in a group of tanks...
Apr8-11 03:54 AM
sandeepbwes
0 494
In thermodynamics heat reservoir has a lot deegres of freedom. Can you tell me some examples of that deegres. Thx
Mar19-12 11:35 PM
Andrew Mason
3 770
I was fascinated by the Wired article describing such an elegant engineering solution for remote data collection deep...
Feb28-07 10:48 AM
russ_watters
4 1,530
See here: http://www.physicsforums.com/showthread.php?t=299561 And: ...
Mar14-09 06:18 PM
rcgldr
4 1,074

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