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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
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,256
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
Cthugha
168 185,512
Hi guys. We have recently got a design 'competition' where we build a vehicle that will propel itself 1.0 m forward...
Mar9-12 12:09 AM
wick
17 4,652
Can someone explain how the Stark Effect works in Layman's terms? I'm trying to understand how an electric field can...
Mar8-12 12:46 PM
eagleswings
1 1,166
Given an example of a gun, if the burn is uniform, and the force is equal on all sides, will the force on the back of...
Mar8-12 09:44 AM
tcharbuck31
1 1,020
Hi, I just bought an iPad mirror screen protector and I'm really puzzled about how it works. You can see a video of...
Mar8-12 08:13 PM
Redbelly98
5 1,506
There are n people with masses mn . Each run up a given slope of height h in times tn. Gravitational accelartion, g, ...
Mar8-12 12:42 PM
kurt
4 1,540
In my lab course, we constructed a circuit that would amplify signals. Here is an image of the circuit. ...
Mar7-12 04:26 PM
Xyius
12 3,465
(This may sound like home work but it's not) What does it mean to display a picture in its frequency domain? A...
Mar7-12 07:33 PM
Delta Kilo
13 4,527
I am trying to figure out if you have one pound of copper density 8.95 and if you have a pound of silver density 10.4...
Mar7-12 08:32 PM
John1397
9 2,282
Why is that an object of more mass attains less velocity as compared to another object of less mass on application of...
Mar8-12 06:34 AM
sophiecentaur
17 1,788
Hi, If I run a current carrying wire through a tube of iron will it shield the magnetic field from outside the...
Mar8-12 02:57 AM
PhysicoRaj
15 2,211
Seems like a dumb/basic question; but, I want to totally flush out the answer.....as there's more to it than most...
Mar8-12 02:22 PM
cmb
20 1,787
I have been out of college for more than 20 years and my basic physics knowledge has become quite rusty. Someone made...
Mar7-12 04:47 AM
Hassan2
2 1,287
Hello, a beginners question here. Can someone please tell me why transmission lines use two wires instead of just...
Mar7-12 04:40 PM
Drakkith
4 1,564
I have a keychain-type red laser pointer (5mW typical type) and I was using it for something when all of the sudden it...
Mar8-12 03:54 AM
PhysicoRaj
1 1,008
I need some ideas for a physics or astronomy related speech?
Mar7-12 07:00 PM
Bobbywhy
2 1,708
I am confused that many web sites say that it took 25 N to crack the egg, it's ok but When I do the drop test with...
Mar8-12 11:11 AM
kimdesug
2 900
What is it, what does it mean/do and why is it used for? Its defined as: S(r)=ln(P(r)r^2/(P(r0)r0^2)), where r is...
Mar8-12 10:23 AM
Fr34k
3 783
Does anyone know why Coulomb chose 1.6x10^-19 for the charge of an electron? (or why he chose 6.25x10^18 electrons for...
Mar8-12 04:11 PM
Borek
7 2,849
Why do objects fall in parabolas, but things orbit in either ellipses or hyperbolas?
Mar7-12 10:10 PM
DaveC426913
5 889
Explain that to cause a continuous flow of elctrons requires high positive potential and less gass pressure? Can...
Mar8-12 03:27 AM
PhysicoRaj
1 1,028
In a vacuum, gravity acts on different mass exactly the same. However, what about on earth.....what is the...
Mar8-12 10:32 AM
maximiliano
3 1,444
If object A and object B collide. Object A is going horizontally while object B is going up-diagonally. We find the...
Mar8-12 02:45 AM
Dr_Morbius
1 966
By Wheeler (and DeWitt), it's called "Superspace and the nature of quantum geometrodynamics", 1968. I googled it, but...
Mar8-12 11:09 AM
Matterwave
3 811
Hello all. Let me start with my main question and then provide a bit more background. I just noticed that an...
Mar8-12 01:18 AM
davenn
1 1,018
I implemented a velocity verlet algorithm, and use it to simulate movement of particles. Depending on the parameters,...
Mar8-12 11:53 AM
franziss
0 1,129
Hi guys, I'm in my 3rd year of a 4-year masters degree in the UK - I've just come to the end of my lab course for this...
Mar8-12 04:22 AM
Millertron
0 940
Diamond has a Debye temperature of Dt = 2000 K and a density of 3500 kg/m3. The distance between nearest neighbors is...
Mar8-12 06:40 AM
CF.Gauss
0 1,026
I'm trying to ascertain the dynamics of a compressed air system in terms of flow rate, air consumption, pressure drop...
Mar8-12 10:41 AM
fonz
1 1,630
How does one go about massing an object less dense than air (like a balloon), because gravity can then not be relied...
Mar8-12 04:54 PM
MrRobotoToo
5 1,693
Looking forward to all the applications this will be used in! ...
Mar8-12 04:38 PM
Drakkith
2 1,143
Hi, I'm trying to grasp the concept of discrete wavelets and can't seem to find an answer to my question. In the...
Mar8-12 11:50 AM
TheWang
0 785
What symmetry of nature yields the conservation of electric charge?
Mar8-12 02:30 PM
azabak
2 829
http://www.lenntech.com/images/venturi3.gif Just simply, from the diagram above is p1=p3 and v1=v3? Thanks Dan
Mar8-12 05:36 PM
rcgldr
3 1,435
I was wondering if density tests work as I have seen that you can hang a piece of silver from a string using a balance...
Mar8-12 05:50 PM
John1397
0 624
Hi, I was doing some tests with lemon batteries today and found that it produced little current (not enough to light a...
Mar9-12 06:12 AM
cmb
5 1,747
What is the difference between orbital velocity and angular velocity ?? because they both have different formulas but...
Mar8-12 11:40 PM
DennisN
1 959
Sorry if this is the wrong section, it wouldn't let me post in the Science Learning Material area. Basically I...
Mar9-12 01:57 AM
issacnewton
1 2,334
Say you have a current set up in the plane of this page going to the right in a long straight wire (horizontal.) When...
Mar9-12 01:30 AM
cragar
4 1,001
I live in AZ so besides the "bubla" or whatever that stupid name is for a huge wall of dust we get thats crazy huge is...
Mar9-12 01:16 AM
Simon Bridge
1 859
I'm currently a Freshman in college, Astrophysics major. So i'm new to physics. I see Michio Kaku on the news...
Mar9-12 01:23 AM
Sefrez
4 1,066

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