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Quality answers to common physics questions
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
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
2 63,627
Time travel into the past is logically possible, provided that your presence in the past only causes things to happen...
Dec26-03 09:04 PM
80 5,474
Hi, First, please look at this example (It takes about 1 minute to load it) : ...
Jan19-04 12:57 PM
80 4,496
Do atoms exist in a vacuum?
Feb13-11 11:02 AM
80 5,340
Peter M McGinnis describes work as being 'the means by which energy is transferred form one object or system to...
Mar5-11 02:02 PM
80 9,962
I have had a discussion with some friends who is interesting in all sort of things of physics and experiments. We are...
Jan28-13 08:17 PM
80 4,131
Hey how are ya? I'm new to physics and all that I took a class in school and it blew me away! A lot of questions are...
Sep25-05 12:34 PM
79 4,176
Hello everyone, May be the question is when something has energy and there is no resistance why does it move?...
May28-10 07:42 PM
Doc Al
79 12,041
why does light travel so fast?
Jan5-11 02:25 PM
79 8,017
Hi all, for some time I have been wondering about something I’m not too sure on. Please could someone tell me how...
Jul30-06 07:41 PM
78 4,990
Reading a website and I noticed that the author claimed that air pressure is essentially equal to the weight of the...
Jul22-11 11:07 PM
78 6,750
The application is drag racing in a rear wheel drive vehicle. The vehicle weighs approximately 3000lbs. Traction...
Sep5-03 12:54 PM
Mr. Robin Parsons
77 21,603
time, travel Time Travel ( 1 2 3 ... Last)
I am curious to see what your opinions are on the odds of Time Travel accually being achieved... under what...
Mar16-04 11:17 AM
Antonio Lao
77 3,500
What do you think of this web page? Reaction torque propulsion It challenges some important notions.
Nov4-04 11:35 AM
Doc Al
77 7,894
My name is James Reinlie, I live in Central Florida. I'm 15 years old and I am very interested in Einsteins theory of...
Aug21-04 07:45 PM
Tom Mattson
77 4,638
Every theory I have ever heard is an attempt to explain something. It seems to me that the first issue is to...
Aug21-04 08:48 PM
77 4,989
OK I dead serious about this. Please check this out: ...
Oct5-09 01:07 AM
crazy horse
77 22,572
This is set in reality. You have a truck, set with high wheels(railroad wheels). Your driving on the railroadtracks...
Jan27-05 10:05 AM
77 6,592
During the 19th century, it was proposed that light travels through vacuum in the presence of a pseudo medium known as...
Feb5-12 11:03 PM
77 9,489
I am here today to propose a "perpetual" device. it doesnt make energy, its perpetual in the sense that more energy...
Aug21-10 08:56 PM
77 7,959
As you all know there's been a great debate about this topic. What does the world currently believe? and also Why?
Apr18-05 04:24 PM
Tom Mattson
76 8,559
First off, let me say that what I am working on has taken me a few days to get to work and I just cant figure it out....
Jul20-09 10:23 AM
76 6,999
I have a question about standing waves. Is this what a standing wave is: a wave produced by a propagating wave and...
Oct28-10 04:58 PM
76 9,220
Zero and Infinity In mathematics, we see these two numbers appear almost always as the end points of some limiting...
Jan31-04 12:33 AM
75 3,413
Someone I know recently stated according to General Relativity, the following statements are both correct: 1. The...
Dec19-10 03:51 PM
75 10,298
Okay, the title sounds weird, let me explain: The father of a friend of mine used to work in the mines about 800m...
Jan30-11 06:33 PM
75 6,393
so, I know the gravitational force is F = (Gm1m2)/r2... but what makes objects attract each other? what is it about...
Oct30-11 06:37 AM
75 23,696
I just finished the first page of the URL at the motivation of my personal mentor, Doc Al. ...
Jul11-04 10:49 PM
Tom Mattson
74 5,500
I am working on a science fiction.I am sorry to open such a thread in the general physics section but i thought I...
Nov16-06 05:32 AM
Chaos' lil bro Order
74 17,435
Does a hard drive weigh more when data is stored in it?
Aug10-10 04:23 AM
74 17,996
It has been said that electromagnetic force attracts electrons and protons to one another, while planets and celestial...
Sep23-11 01:27 AM
74 5,505
Is body at higher altitude having more potential energy than a body on earth real.? Does this mean a person at 400th...
Dec15-13 09:36 PM
74 6,319
I carefully studied these links and came to the conclusion that the big bang is running out of steam. ...
Jun27-04 04:09 PM
73 7,194
I recently posted showing that replacing the affine connection in general relativity with a teleconnection would lead...
Oct12-06 04:21 AM
Charles Francis
73 1,622
Anyone who has studied electromagnetism knows that the magnetic force on a moving electrically charged particle such...
Sep23-11 01:12 PM
73 20,477
Not too long ago Topher started a thread asking: is it possible to construct a wind powered vehicle that goes directly...
Nov9-08 12:19 PM
73 19,406
Okay I am no physics pro, but Galileo claimed/proved that two objects of differing mass will fall at the same...
Nov13-09 10:04 PM
73 8,266
I was under the impression that, by experiment, Newton deduced \textit{F}\propto{m} \rightarrow \textit{F =...
May13-12 02:00 AM
73 12,880
This video is from 2007 but it stated the goal at that time was a 64...
Apr24-13 12:27 PM
73 5,845
It can be handy to ignore the Earth's rotation and simply work with the effective g', instead of accounting for...
Nov4-11 05:29 AM
72 6,102
I thought of a question and its been causing some debate with my collegues. Its completely hypothetical and possibly...
Jun10-12 08:22 AM
Ken G
72 5,630

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