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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
2 69,467
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
168 186,505
What do you think the Efficiency of Wave Power is in percentages? Im trying to figure out the waste of the wave...
May24-10 06:11 PM
2 1,374
As I understand it photons govern the electromagnetic field. I don't have an intuitive knowledge of what that means. ...
May24-10 06:39 PM
2 1,169
From my understanding electrons are point particles with zero volume, therefore zero radius. F = GMm / r^2 F =...
May24-10 08:29 PM
2 932
Many of you have done this in your past. Two magnets, one under a table, another on top of the table, and moving the...
May24-10 10:34 PM
7 6,142
Hello. I was wondering, if light from a star (for arguments sake take our sun) emits light, and the light passes...
May24-10 11:02 PM
11 1,709
Hi, If I have two 1 kg masses that are going to hit each other. Mass A is traveling at 10 ms and Mass B is at rest...
May25-10 03:06 AM
8 969
is this a correct way to describe the MP? It means that everything is everywhere doing everything in every possible...
May25-10 03:49 AM
1 920
How do we determine the values of any given fission reaction? How do we answer questions like: A decrease in mass...
May25-10 07:37 AM
Doc Al
1 1,026
In electronics it is customary to define the potential of ground (thinking of the earth as a large conductor) as zero....
May25-10 11:16 AM
2 1,889
Say you go parachuting. And you jump, without opening the parachute... You get a constant acceleration due to...
May25-10 01:28 PM
2 1,780
ok, i'm basically just a normal average guy and I don't take physics or such but there are things I ponder. My...
May25-10 01:42 PM
12 1,469
I couldn't sleep the other night because I was thinking about photons and their ability to penetrate materials. It can...
May25-10 02:46 PM
1 997
Not 100% certain this is the best place to ask this question, though I've asked questions here before, and there seems...
May25-10 02:51 PM
6 1,080
This is a question concerning the wave nature of light and the conservation of energy. Consider a prism that...
May25-10 02:56 PM
6 3,129
I didn't read into it too much but supposedly they found that matter and antimatter don't cancel each other out...
May25-10 03:12 PM
4 1,102
if a charging a capacitor of capacitance of 1 farad with resistance of 30 ohm will it charge faster or discharge...
May25-10 03:30 PM
7 955
If a ball has a mass of m1 and a velocity of v1, and collides with a second ball with a mass of 20 times m1 (m2=20xm1)...
May25-10 04:09 PM
1 792
Hi guys, first post here but I have been looking around a while and this forum has proved to be pretty helpful. I have...
May25-10 08:31 PM
Andy Resnick
7 2,059
We know that matter is discrete, and energy is quantized, (and more quantized things I don't know about.) There is...
May25-10 08:41 PM
6 1,775
Human's throat sends the sound (person's hidden sound wave) namely reads silently the sound person's hidden sound...
May25-10 11:44 PM
2 840
Hi guys. I'll start out by admitting that I know very little about fluid dynamics, physics, etc. I've been searching...
May26-10 04:18 AM
1 1,285
Since mass and energy are both different forms of the same "thing," is there a name for that "thing?"
May26-10 07:02 AM
13 1,788
Okay, this is gonna be one hell of a skeptical thread. Being a musician and all i have music software that enables...
May26-10 07:08 AM
1 1,214
If electrons orbit an atom in discrete energy levels like n= 1 , 2, 3 ..... and they never orbit in between the...
May26-10 10:44 AM
5 1,531
anything big like it costs more then 15 million and some how it has made or is attempting to make a significant...
May26-10 10:56 AM
1 1,311
I have a copper penny attached to the negative terminal of a 9V battery. I have a nickel (made of the metal nickel)...
May26-10 11:06 AM
1 1,018
Are mass and density always in a 1 to 1 relationship? For example, can there be a material that takes up more space...
May26-10 11:44 AM
18 5,285
Hello everyone. I am currently a grade 11 High-School student and have embarked on making the...
May26-10 03:03 PM
25 2,422
This is my question: I have a fixed volume of air (80cf). This volume of air is in a slight vacuum (-.25 inches...
May26-10 03:22 PM
0 1,669
was looking over my physic electricity i got some question actually i just forgot them. v(t)=V(1-e^(-t/RC)) ...
May26-10 08:23 PM
4 1,357
Hello everyone, Let's say there was gun and a bullet with a mass of 1kg at rest. The bullet and guns speeds were 2...
May26-10 08:38 PM
4 1,568
As ole' Feynman said: "Turbulence is the most important unsolved problem of classical physics." So why is it so,...
May27-10 04:08 AM
7 2,920
Hey PF, just a question out of my own curiosity that I've been wondering about. What type of equations/formulas/...
May27-10 05:34 AM
0 973
Also what form would this Mass take? And if this was possible would this not shine a bit of light on the plausibility...
May27-10 01:40 PM
6 3,924
I apologize for the very simple question, but I find often the simplest questions are the ones not answered in books....
May27-10 02:33 PM
1 829
We all know that physical quantities are expressed as vector or scalar quantities.Now let consider 'area',if I say my...
May27-10 02:47 PM
3 2,185
Hey I'm fairly new to PhysicsForums so apologies if this is in the wrong forum. I'm about to enter my third and...
May27-10 02:56 PM
0 3,045
Hello everyone, If an object is hanging from a string in the wall. It is stationary so this means tension of the...
May27-10 06:23 PM
2 1,423
So I've decided to research the physics of pizza tossing. What I have so far is that the dough experiences helical...
May27-10 10:24 PM
2 1,639
Hm, I wonder since neutrino's have no electric charge or color charge, but do have mass, is it possible for two...
May27-10 11:57 PM
3 1,236

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