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Quality answers to common physics questions
Jul24-14 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
168 186,399
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 69,437
Today my English teacher told us that we you can't lift a four-legged chair (of avg weight) if you only lift from the...
Apr29-13 04:07 AM
5 1,332
This is a real world application that I'm trying to figure out. I need to estimate the spring constant of a standard...
Apr28-13 10:35 PM
2 704
In your opinion who is your favorite scientist that studied heat/temperature and why? Secondly, what scientist do...
Apr28-13 02:57 PM
5 602
I see text books assign directions to magnetic field lines, for example north poles extending outward and south...
Apr28-13 02:01 PM
6 933
Do electrons all orbit an nucleus at the same distance? I.e is an 's' cloud always the same in every atom or does the...
Apr28-13 07:58 AM
5 641
If I reach the speed of light which is 300 00 km/s the time will stop! and if I travel faster then light i'll travel...
Apr28-13 07:37 AM
31 2,045
If we melt ice at 0'C to water at 0C, what is the change in the internal energy of the ice-water system? As per the...
Apr28-13 03:39 AM
Shoaib Iqbal
18 14,605
I have an air molecule moving because of a sound wave. f of sound wave = 500 Hz wavelength of sound wave = 0.68 m...
Apr28-13 02:35 AM
1 649
In this experiment, the graphite is a polycrystalline structure. That's is why we observe two intense rings. What...
Apr27-13 05:49 PM
M. next
5 519
We have two equations delta EP = -W V = -Ed Now, to my understanding for the second equation (E = -V/d) since...
Apr27-13 04:54 PM
1 749
Hi I want to pass DC current through a magnet, essentially using it as connector. The magnet I am using...
Apr27-13 04:47 PM
5 888
There are two objects, lets go with the classic cannon ball and football. These objects are both equal in size and...
Apr27-13 03:35 PM
3 661
A train applies steel wheels to a steel track. Therefore, without any distortion of the wheel or track, the contact...
Apr27-13 01:49 PM
42 2,060
Hello, this is not a homework assignment. I am referencing an old assignment from a few semesters ago. I am curious...
Apr27-13 10:16 AM
1 564
When an electron moves through a wire between two terminals on a battery some of its potential energy is converted to...
Apr27-13 08:58 AM
4 854
Basically I have to make a comparison matrix of the bionic eye, the human eye and the camera. I want to sound...
Apr27-13 08:25 AM
1 777
This experiment aims towards finding e/m ratio and it is a very well known experiment that's why I will directly post...
Apr27-13 07:07 AM
M. next
3 876
Hi, It may not be the best title chosen but here is the question. If I have one container that has two...
Apr27-13 06:11 AM
2 596
Hi, Where can I find, or how can I compute, the phase velocity in water at 10KHz? I need this value to compute...
Apr27-13 04:54 AM
0 540
If I understand it correct,energy of atomic electronic shells fusion cannot exceed energy of their breakdown.For...
Apr26-13 10:42 PM
14 1,387
Since friction is a "force" and is able to stop a moving object, why doesn't it possess energy? For example, light,...
Apr26-13 03:20 PM
21 1,558
I just got one of those new fancy stainless steel thermoses recently to keep my morning coffee piping hot for hours,...
Apr26-13 01:34 PM
11 870
According to Gauss’ law the total number of lines of force over a closed surface is equal to 1/ε times the net charge...
Apr26-13 11:41 AM
7 804
When we use Boyle's Law it means that as pressure increases the volume of the container would decrease. In my notes...
Apr26-13 10:26 AM
7 1,020
I don't know whether I should post this under cosmology, but since it's mainly about light rays so I'll put it here. ...
Apr26-13 09:03 AM
21 1,329
Now I am just thinking about pressures and material strengths and I came across a question.To formulate the question I...
Apr26-13 08:07 AM
6 700
and positive when they repel? It doesn't make any sense to me at all. To what are they referring to? The way I...
Apr26-13 03:56 AM
Doc Al
1 736
I'm dealing with a cylinder. The equation for the stress of each is Force / Area. What are the different areas for the...
Apr26-13 03:31 AM
3 1,581
Premise: Ball A is accelerated on a level, frictionless plane until it reaches a velocity of 5 m/s. Ball A travels at...
Apr26-13 03:23 AM
8 691
so i have a piece of nichrome resistance wire, 230 v supply in free air horizontal it is 650 c when current 3.61...
Apr26-13 02:06 AM
2 497 how to interpret this equation...
Apr25-13 09:00 PM
Simon Bridge
4 601
just a question the mass of a 1967 mustang travelling at 40 mph hitting a human (me) in 1980 my weight 179 lbs...
Apr25-13 08:58 PM
7 724
Hi all, I have a question about mass conservation and the way that I should apply it on my problem. Consider a...
Apr25-13 08:28 PM
0 610
Hey guys, I'm currently working on a chemistry setup and we're building some protocols. We decided that every...
Apr25-13 07:59 PM
6 518
A note from Newton's Principles definition #4 in 1687: Impressed Force - This force conflicts in the action only;...
Apr25-13 07:01 PM
0 575
Does the moon's orbit depends mainly on the gravity of earth and the distance between it and between earth?
Apr25-13 05:11 PM
6 583
I'm trying to find out the force on a collision that happened to me recently, nothing serious but the lady went away...
Apr25-13 03:41 PM
2 544
If you stuck 1 electron into the inner shell of a hydrogen atom, would the properties change? Thanks all, Joe.
Apr25-13 03:00 PM
1 491
Hello i have a little clarification to make for myself with the help of you:) So we know that electricity moves so...
Apr25-13 01:13 PM
5 670
I personally don't ride a motorcycle, but I want to know if that relates to Physics. When someone holds the Clutch...
Apr25-13 12:50 PM
27 1,821

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