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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
166 160,213
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 63,633
Hey everyone, I'm getting ready to start my IB Extended Essay in Physics, and sent a proposal to my supervisor for...
Aug28-05 08:30 PM
19 3,172
Hi. I am looking for correct mathematical definition of longitudal wave im 3-D if somebody will help me with some...
Aug28-05 08:02 PM
Claude Bile
2 2,604
We know that the sun's light takes 8mins to reach the Earth. That means the sun we see now is actually what the sun...
Aug28-05 09:27 AM
5 976
We don't know how cells or bacteria were created which is a highly orginazed chunk of matter. But if it arose...
Aug27-05 09:41 PM
27 3,474
I've read that there is a thermodynamic arrow of time, based on the fact that entropy can only increase or stay at the...
Aug27-05 06:48 PM
8 1,454
I am having problems explaining the a certain group of inanic acquaintences that just can't understand that...
Aug27-05 10:15 AM
10 2,102
Im reading a wonderful book called Springer Handbook of Nano-technology and Im on the chapter dealing with how the...
Aug26-05 05:41 PM
0 1,873
Is there anyone here who is interested in doing research in Mechanics (preferably relativistic)? Post your ideas here...
Aug26-05 04:00 AM
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Neglecting evaporation, if you have a cubic mile of water (1 mile by 1 mile by 1 mile) how long would it take to drain...
Aug26-05 01:55 AM
8 1,152
Hi, I'm doing a project on mesuring the conductance of flames, but I need a lot more physics to back up my theory. I'm...
Aug25-05 07:33 PM
4 2,924
Hi, Do white holes exist? If not why not? If a white hole is the opposite of a black hole then it will have the...
Aug25-05 03:42 AM
8 3,123
Dear Michio Kaku. I wanted to ask a question about traveling in space with a space ship. If a space craft emits...
Aug24-05 09:43 PM
2 2,606
Why does the Loop Rule arise as a consequence of conservation of energy?
Aug24-05 08:55 PM
33 8,502
does anyone know how i could go about calculating how much power is needed to move 1,972,080 gallons of water at a...
Aug24-05 03:37 PM
Doc Al
1 1,092
Today, my lecturer asked us to define physics. No one give a very obvious and correct answer to the lecturer. Can...
Aug24-05 11:49 AM
Doc Al
106 6,150
I suppose Mods wouldn't like this, but I consider this a particularly excellent problem and it's not actually homework...
Aug24-05 10:27 AM
Doc Al
1 1,199
I suppose this sounds a little silly, but: Momentum has to be conserved, but often at the cost of some kinetic...
Aug24-05 10:10 AM
5 884
Postgraduate and postdoctoral opportunities are available to work on various projects in the Micro/Nanophysics...
Aug24-05 06:45 AM
0 3,000
:smile: :surprised
Aug24-05 01:35 AM
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how can the negative angular velocity(backspin) be calculated when a lofted club strikes a ball below its equator?
Aug23-05 05:05 PM
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I'm still new to physics in general and I was wondering if any of you could tell me some good books to read about...
Aug23-05 02:42 PM
Renge Ishyo
2 1,678
Hello.. I'm having some trouble understanding the meaning of the trem "spatial velocity". I'm working on ECG and i...
Aug23-05 12:33 PM
1 3,446
plz anyone of u please help me out in these few questions.... 1.) A jeweller has a crown which he thinks is made of...
Aug23-05 12:01 PM
0 808
Hi people, I wanted to ask those who have started doing some research and have lots of downloaded articles on their...
Aug23-05 11:53 AM
0 944
Note to newcomers: This is a very old thread that does not meet the current forum guidelines and has therefore been...
Aug23-05 07:47 AM
49 112,652
Ok, I have a question concerning one (rather important) aspect of time travel I don't recal anyone really discussing;...
Aug23-05 07:23 AM
6 2,249
Hello, i've read an EMP subject on this site a few minutes ago, it' didn't help me anything at all. My buddy had...
Aug23-05 02:00 AM
5 2,508
I'm not exactly sure where to post this, but does anybody know of a website that has different historical papers from...
Aug22-05 01:21 PM
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hi...can someone pls suggest a scientific breakthrough (recently:2-3 yrs) that is related in physics..aomething easy...
Aug22-05 01:09 PM
1 1,509
a dummy question, but does a photon correspond to one wavelength of a wave...does wave mean one wave length?
Aug22-05 09:07 AM
5 1,022
OK, semantic hair-splitting time. The two words "property" and "characteristic" mean essentially the same thing,...
Aug22-05 05:47 AM
Chi Meson
8 13,154 One of many articles on the proof that lightning is caused by...
Aug21-05 11:39 PM
1 829
Why does the point rule arise as a consequence of conservation of charge?
Aug21-05 07:50 PM
16 5,479
I understand that background radiation that we observe actually dates from the time of the creation of the universe...
Aug21-05 01:04 PM
20 3,453
Hi, Heres a little discussion topic that I find interesting. What is the difference between discovery and...
Aug21-05 10:50 AM
8 16,022
When a ray of light travels from an optically denser medium to a rarer one such that the angle of incidence equals the...
Aug21-05 10:48 AM
6 1,636
Why the Michelson-Morley experiment is not reliable, and why Einsteins (I dont want to reveal my identity over the...
Aug21-05 08:14 AM
Doc Al
3 1,381
Which is the maximum acceleration that a body (like a person or a car) can reach in the ground, and without using any...
Aug21-05 01:11 AM
34 10,619
If I understand well, Planck units are fundamental in the sense that they don't depend on any arbitrary choice of...
Aug21-05 01:04 AM
25 4,407
It may be a strange question, Is there a dominant colour in our universe? ignoring black and white. I have looked but...
Aug21-05 12:58 AM
9 1,710

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