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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 47,855
I'm taking a first year physics course and have been having a little trouble with the basics of newtons laws and...
May22-13 01:35 AM
raopeng
6 723
In circuits, we have no problem saying that the voltage difference between two point is \cos(\omega t), but what does...
May21-13 08:20 AM
stevenb
8 1,342
I have a few questions pertaining to some concepts in electrostatics, I'd be grateful if someone would help me out. ...
May22-13 01:27 PM
phymathlover
9 1,082
Hello all, I am working on a science project based upon paper, and I have chosen the affect of friction between two...
May21-13 11:38 AM
Atham
15 1,032
Hi fellow members!!! I would like to ask a silly question because my basic concepts are quit weak. Since according to...
May22-13 06:29 AM
adjacent
8 1,266
Yesterday I got fascinated by the camera recordings on the Atlantis Space Shuttle....
May21-13 03:24 PM
LastOneStanding
10 848
What is the distinction between EM waves and Sound waves. I know that sound is cyclical vibrations in some sort of...
May23-13 06:34 AM
phinds
5 689
Say, a body of mass 'm' is thrown at a certain angle with the vertical with certain initial velocity 'u'. The initial...
May24-13 09:01 AM
s0ft
8 754
Hello Dear Fellows! We all know that light is an electromagnetic wave and also we know that...
May20-13 01:41 PM
nsaspook
8 705
I have been looking at mass spectrometers, in particular the interactions between the Bf ind of a charged particle in...
May21-13 09:03 PM
mesa
8 668
Let's say I have a circuit consisting only of a finite number of batteries and resistors, all ideal. Given an...
May22-13 07:41 AM
stevenb
10 859
Hello Can anyone tell me how the absorption of a polystyrene nanoparticles scales as a function of its diameter. ...
May20-13 12:06 PM
Excom
2 395
In my physics book there is an example of making a square wave by "simply" summing up a few cosine waves. The book...
May20-13 03:58 PM
MisterX
5 844
hey all! can anyone please explain where the equation {Gmm_e}/{r^2}={mgR^2/r^2} comes from given $$ma=Gmm_e/r^2$$...
May23-13 10:42 PM
Zag
8 1,130
I have been looking for a better way to power my electromagnet than a bunch of AA batteries, and am now thinking of...
May22-13 02:22 AM
CWatters
3 626
Hello, I was wondering if there is a conceptual explanation for when current leads voltage or vice versa for...
May22-13 04:43 PM
mikeph
3 586
Given some chemical reaction, A+B -> C+D (all are ideal gases) that occures in 298K and 1 atm. why can't I...
May21-13 12:07 PM
lightarrow
6 559
If you place a wire with a running current in a magnetic field, the magnetic field will excert a force on the wire....
May23-13 09:09 AM
BruceW
13 896
I am doing a paper on the physics in Valve's Portal and got interested in the "Long Fall Boots" that prevent any...
May22-13 01:58 AM
CWatters
2 1,125
Virtual work principle states: δW = \sum^{N}_{i=1}\vec{F}_{i}\centerdot δ\vec{r}_{i} And from this, we can see...
May21-13 02:46 AM
Astrum
2 523
I'm kind of rushing through first year physics cause im doing it self paced, but I am realizing now that as an...
May20-13 06:43 PM
Jorriss
2 344
I have a question about solenoids. The formula for the magnetic field energy density is: ...
May22-13 10:08 AM
milesyoung
6 843
i) If a wall breaks when it gets hit by a cannonball, did the wall exert an equal and opposite force on the...
May21-13 04:58 PM
faldahlawi
3 597
I've been mulling this over all weekend, and I've decided to get some help on this. The problem is writing a function...
May20-13 07:25 PM
milesyoung
4 619
I'm modeling a single 3D rigid body in preparation for some more complicated modeling in order to gain a better...
May22-13 06:56 AM
D H
5 1,364
Hello, I am wondering, what is the physical interpretation of the angular frequency of AC voltage? I don't see the...
May20-13 08:40 PM
BruceW
1 732
Any experts on Griffith's fracture theory? I am studying the subject and I am having hard time finding out if the...
May21-13 01:19 AM
wonderer_85
0 402
How is it that bubbles form on the bottom of a surface of a pot of boiling water? I think that there is probably...
May21-13 10:26 PM
klawlor419
9 1,410
Hi. I'm having some difficult in understanding something about the dipole term in a multipole expansion. Griffiths...
May21-13 08:09 PM
LastOneStanding
1 503
I wanted to mention that this solenoid has many winds over many layers. The thickness of the windings is 2.4 inches...
May22-13 08:10 PM
eigenstaytes
0 471
Can we convert energy to matter?
May21-13 08:49 PM
velocity boy
12 1,329
I'm having some difficulty understanding exactly what the difference between the definitions of these values are. As I...
May22-13 05:25 AM
Suvat99
0 576
Hello everyone, A friend of mine came up with this question in class and I really do not have a good answer. ...
May22-13 05:15 PM
Zag
4 1,073
A rough sketch of experiment. http://i43.tinypic.com/14t4sk5.png the red dots represent a side view of path...
May22-13 04:45 PM
tiny-tim
3 547
what are the differences? Every example I find usually has a derivative or integral or some kind of calculus defined...
May22-13 06:44 PM
HomogenousCow
4 773
For example.... wind turbines are primarily listed by their wattage (1.5MW etc.) Presumably their output is varied...
May23-13 11:55 AM
marcophys
3 666
My model is a lever on a table top. One arm is horizontal on the table, while the other arm is raised at an angle...
May23-13 06:13 PM
anothersnail
4 572
Hi ... anyone now how to calculate or the formula of the rudyak-krasnolutski EFFECTIVE potencial ? the effective...
May23-13 02:50 PM
leaoshark
0 352
Suppose TEM wave in +z normal to a boundary on xy plane at z=0. We know E & H are tangential to the boundary. Let...
May24-13 01:43 AM
yungman
4 670
Wire A and B, which have the same cross-sectional area are connected in series. There is a p.d. V across the whole...
May24-13 12:04 PM
tech99
1 331

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