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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 71,275
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Sep5-14 05:07 PM
DennisN
170 192,486
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 1,044
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
Studiot
2 1,938
Say you go parachuting. And you jump, without opening the parachute... You get a constant acceleration due to...
May25-10 01:28 PM
Jonnyb42
2 1,821
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
JDługosz
12 1,496
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
JDługosz
1 1,022
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
Zamdrist
6 1,123
This is a question concerning the wave nature of light and the conservation of energy. Consider a prism that...
May25-10 02:56 PM
DaleSpam
6 3,191
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
CosmicCrunch
4 1,130
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
berkeman
7 971
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
mathman
1 806
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 2,121
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
DrGreg
6 1,839
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
jakksincorpse
2 850
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
xxChrisxx
1 1,309
Since mass and energy are both different forms of the same "thing," is there a name for that "thing?"
May26-10 07:02 AM
Rasalhague
13 1,812
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
jakksincorpse
1 1,230
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
sophiecentaur
5 1,563
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
bp_psy
1 1,383
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
cragar
1 1,033
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
TheAlkemist
18 5,481
Hello everyone. I am currently a grade 11 High-School student and have embarked on making the...
May26-10 03:03 PM
jakksincorpse
25 2,479
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
mcgreen29
0 1,698
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
pgardn
4 1,394
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
sameeralord
4 1,594
As ole' Feynman said: "Turbulence is the most important unsolved problem of classical physics." So why is it so,...
May27-10 04:08 AM
xxChrisxx
7 3,001
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
Lazy
0 1,003
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
DrGreg
6 4,083
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
JDługosz
1 836
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
Nabeshin
3 2,272
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
JackP
0 3,108
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
rcgldr
2 1,446
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
Creator
2 1,670
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
Nabeshin
3 1,263
How exactly do digital multimeters measure things like potential difference, electric current, and electrical...
May28-10 08:44 AM
mgb_phys
1 2,269
Hello everyone, First of all I am new here and I hope I came to the right place :) I have been troubled by two...
May28-10 09:21 AM
phoebus16
19 6,637
at what diameter, pitch, and blade number would be the best combination for a high speed propeller? i'd like the...
May28-10 11:19 AM
Cyphear
1 888
Ok so I am writing a physics "research" paper over any topic we like. The one requirement is that the intro must be...
May28-10 03:58 PM
island
16 1,944
Is it possible for a fish or a bird to swim/fly faster than sound? I mean: no rockets, no free fall, no cheating by...
May28-10 04:20 PM
alice22
13 3,634
Supposedly, in the center of our galaxy (and in most galaxies, if I'm not mistaken) there is a super massive black...
May28-10 05:47 PM
Mu naught
3 2,022
Hiya, I'm doing an experiment to see how thermal radiation affects the temperature of water. I have a container with...
May28-10 07:40 PM
Santio
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