I know that the electric and gravitational forces diminish wrt distance in accordance to the inverse square.

But what of dipoles? If you have an electric dipole, at what inverse power does the electric force diminish wrt distance? What about magnetic force?

2007-09-08 01:24:20 · 1 answers · asked by tuthutop 2 in Physics

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To math coaches, IMO coaches and the like, i need help on deciding...?

there are two books which i am choosing from and i want to maximize my choice as possible. The two books are: USSR Olympiad problem book by Schlarksky, yaglom, et.al and the other one is Mathematical Olympiad Challenges by Titu Andreescu, et.al. Since i can't look inside the book, can you help me decide? Also, since i'm starting to tackle IMO-level training, which book would you reccomend to be friendlier for a starter. Also, the book should most probably not have calculus lessons for the IMO is on pre-calculus.thanks for the advice and i hope you'll help...:D

2007-09-08 01:20:54 · 1 answers · asked by bigred123 2 in Mathematics

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whos the president of the monkeys...?

2007-09-08 01:07:33 · 7 answers · asked by indian_marvz 1 in Zoology

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What kind of virus can virgin oil from coconut prevent?

2007-09-08 01:06:47 · 1 answers · asked by roberto a 2 in Engineering

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Prove: sin θ = [ e^(iθ) - e^(-iθ) ] / 2i and cos θ = [ e^(iθ) + e^(-iθ) ] / 2?

Prove:
cos θ = [ e^(iθ) + e^(-iθ) ] / 2
sin θ = [ e^(iθ) - e^(-iθ) ] / 2i

I already know that cis θ = e^(iθ)

And that:
cos θ = Re{ cis θ } = Re{ e^(iθ) }
sin θ = Im{ cis θ } = Im{ e^(iθ) }

But how do I actually extract the functions, in terms of e, of each trigonometric function?

How do I prove:
cos θ = [ e^(iθ) + e^(-iθ) ] / 2
sin θ = [ e^(iθ) - e^(-iθ) ] / 2i

2007-09-08 01:05:36 · 2 answers · asked by Anonymous in Mathematics

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What is the difference between hurricanes, tornado's and earthquakes?

2007-09-08 01:02:45 · 10 answers · asked by Anonymous in Weather

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Acid Rain..?

Where does acid rain commonly occurs in the world?

2007-09-08 01:01:19 · 5 answers · asked by Anonymous in Weather

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Please help me to name my machines..... !?

I know this may look funny and non-sense to many. But I really have tough time in addressing my testing equipments by their brand name and model number. I need ur help in naming them in a simple way those can be understood globally. I have given the eqpments below. Pls give me some names those matches the letters.

V series (6 machines)

PK series (3 machines)

D series (2 machines)

M series (2 machines)

T series (5 machines)

E series (2 machines)

S series (4 machines)
------------------------------
One sample for ur reference: using the solar system
V = Venus

D = Dione

T= Titan

P = Pluto

M = Mars

E = Earth

S = Saturn
This looked interesting. But I wud appreciate if someone can gimme a better list....

Really THIS IS NO JOKE !