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May25-09 10:31 AM ZapperZ 

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Apr8-14 10:13 AM
ZapperZ
166 160,202
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 63,627
Hi, The Gilmore equation is associated with bubbles in gas. When equated to a mass-spring system, you get the...
Jan14-13 09:13 AM
nasu
1 549
I need to figure out the best way to improve drainage of spring water flowing through my property. The water from...
Jan14-13 04:30 AM
Studiot
19 1,710
They have the spin top magnet that you spin on top of a platform, which by effect causes it to appear to float. Is the...
Jan14-13 04:29 AM
sophiecentaur
1 562
hi i have a doubt about magnetism i am assuming that magnetism is caused by spinning electric flux if we change...
Jan14-13 04:12 AM
boletoms
6 906
I guess the title gives it all. I understand the concept on a basic level. What i don't understand is that how does it...
Jan14-13 04:04 AM
sophiecentaur
19 1,673
I'm working on a project, I just need ballpark estimates for the spring constant and damping coefficient for my 1994...
Jan13-13 06:13 PM
zacharoni16
7 902
I'm looking for a list of inference rules used in physics derivations. I think this would be distinct from Wikipedia's...
Jan13-13 02:36 PM
benno
0 743
Hello, Is there any difference between 50/60 AC current and a 50/60 Hz photon stream/electromagnetic wave...
Jan13-13 01:26 PM
anorlunda
19 2,333
I essentially want to understand weather or not an aerofoil with a zero attack angle will generate lift, i.e. using...
Jan13-13 07:02 AM
CWatters
17 1,249
We have to build catapults in school and the teacher wants us to hit targets placed 2-4 meters but to get it to go a...
Jan13-13 06:55 AM
CWatters
2 684
I read somewhere that the focus of a plane mirror is at infinity because rays after reflection from a plane mirror...
Jan13-13 06:00 AM
Low-Q
2 582
How is (density)(gravity)(height) supposed to equal pressure? density = kg/m^3 gravity = m/s^2 height = m ...
Jan13-13 03:03 AM
cytochrome
2 591
Is the right hand rule for determining the direction of the magnetic field, force, and current only used when the...
Jan12-13 11:12 PM
TheAbsoluTurk
3 745
Since temperature is no more than vibrating atoms (in Feynman's words), wouldn't that induce a changing electric...
Jan12-13 08:17 PM
0xDEADBEEF
1 544
I kindly ask for assistance in derivation of the equation for instantaneous power in an electric circuit, P(t) = V(t)...
Jan12-13 05:29 PM
Studiot
1 707
Hello, I am trying to derive the mutual inductance between the two coils of a transformer. I want to do this for...
Jan12-13 04:05 PM
w1002644
0 692
Absolute zero is the theoretical state in which a system reaches 0K, or NO energy present right? And if gravity...
Jan12-13 11:18 AM
0xDEADBEEF
12 1,179
I was thinking about olbers paradox and how I could apply it to gravity. We assume that their are an infinite...
Jan11-13 06:00 PM
mfb
3 839
I am looking at the cross-sectional shape of a sagging membrane. I have several theoretical models, neither of which...
Jan11-13 04:21 PM
Chestermiller
2 860
Hi, This question is about a discussion in the two chief world systems, the second day about p 230 in the modern...
Jan11-13 04:13 PM
zoobyshoe
5 892
Hi, yesterday my dad and I were debating whether flow rate stays constant throughout a system. I told him we learned...
Jan11-13 01:59 PM
Studiot
18 848
Hello, comparing the formula of gravitational attraction with F = m*a you get that the smaller mass disappear. I...
Jan11-13 01:29 PM
bahamagreen
28 1,808
I have two springs, they are connected in series. I have the load-deflection curves for each spring. How can I...
Jan11-13 10:26 AM
lovi
2 494
When a rocket is launched there is an upthrust which is provided by the combustion of its engine. However, during the...
Jan11-13 10:24 AM
BruceW
27 2,173
I am having trouble puzzling this one out. What I am trying to understand is why the tension of a rope is uniform...
Jan11-13 09:52 AM
Studiot
12 1,777
First post here. Hello! I am wondering how close a bouncy ball's bounceback ration can get to 100% with our current...
Jan11-13 08:29 AM
Low-Q
5 844
i was reading an example of area calculation of a nozzle,in which mass flow rate was and coeff. of discharge (ratio...
Jan11-13 03:18 AM
engnr_arsalan
0 528
The title says it all--I'm working through The Feynmann Lectures, and came across the assertion that a magnetic field...
Jan10-13 10:33 PM
demoncore
0 789
hi All, I recently got interested in a general solution to diffraction from an object at verious distance and...
Jan10-13 01:55 PM
Gobil
4 855
I have a question about efficiency of electrical heating vs. mechanical heating. Let me explain an example: I...
Jan10-13 01:47 PM
engnr_arsalan
5 890
Hi All, This is a bit long, so only read on if you have too much time on your hands... Clinically its important to...
Jan10-13 09:12 AM
simondon
0 760
Hello, I am reading a paper in which the author describes how he scales the velocity profile of a car. He is...
Jan10-13 08:49 AM
Chestermiller
6 942
I've never heard it said before but it appears to me that all electrical current that flows in a solid state component...
Jan10-13 06:58 AM
sgb27
13 1,366
what is the value for our solar constant?
Jan10-13 06:02 AM
mfb
1 428
Is it the case that the laws we have set for our universe and the proportionality constants which help define those...
Jan9-13 09:59 PM
Simon Bridge
3 1,031
Hello- I have a diffusion profile, in which I plot the decrease in concentration versus distance of my sample. I...
Jan9-13 09:01 PM
Chestermiller
4 674
Hi all. I was wondering about a particular kind of toy train that is sold to young children these days. I bought a few...
Jan9-13 08:54 PM
pantaz
9 971
Hi, I put an overturned bottle inside a container filled with 0.5 m of water but water didn't enter inside the...
Jan9-13 02:16 PM
jbriggs444
3 609
What is a syphon breaker??? And how does it work???
Jan9-13 02:14 PM
charlie95
2 834
can small piezoelectric disks 3.7x3.7 cm inside a tube with a buzzer at the other end be able to power an LED
Jan9-13 01:52 PM
jedishrfu
1 514

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