Science & Mathematics - 8 December 2007

2007-12-08 23:59:32 · 24 answers · asked by ? 5 in Agriculture

2007-12-08 23:51:42 · 5 answers · asked by art 1 in Earth Sciences & Geology

2007-12-08 23:45:42 · 17 answers · asked by ? 3 in Astronomy & Space

1. find the product of
[4(cos30° + isin30°)] * [6(cos120° + isin120°)]

2. Find the the three cube roots of 1.
I don't understand, isn't the answer supposed to be one?

3. Write all solutions of the equation
x^5 + 243 = 0

answers:
1. -12√3 + 12i

2. cos0 + isin0
cos 2pi/3 + isin 2pi/3
cos 4pi/3 + isin 4pi/3

3. 3(cos pi/5 + isin pi/5)
3(cos 3pi/5 + isin 3pi/5)
3(cos pi + isin pi)
3(cos 7pi/5 + isin 7pi/5)
3(cos 9pi/5 + isin 9pi/5)

2007-12-08 23:44:52 · 2 answers · asked by Anonymous in Mathematics

a) magnesium chloride;
b) barium chloride?

Thank you! x

2007-12-08 23:25:59 · 1 answers · asked by Anonymous in Chemistry

Integral Calculus

2007-12-08 23:24:28 · 1 answers · asked by dyogart 1 in Mathematics

Hello. I'm having a difficult time trying to figure this problem out about quadratic functions and their vertices. The problem says to identify the quadratic function using the vertex of the quadratic function and a point in which the function passes through. I'm assuming I have to use the standard form of a quadratic function. The vertex is (4, -1) and the point is (2, 3).

I would very much like if someone were to show me how to do it step by step instead of just giving me the answer. I don't want to keep posting questions on twenty problems about the same thing.

Not to sound demeaning, but I would appreciate it greatly if correct answers/steps are given. I have seen many times where people would have four different answers to a simple algebraic problem because of a adding/subtracting mistake.

Thank you!

2007-12-08 23:22:25 · 2 answers · asked by Anonymous in Mathematics

differential calculus

2007-12-08 23:08:38 · 6 answers · asked by citizen5 1 in Mathematics

An electron is released from rest in a uniform electric field of magnitude 8 * 10^4 v/m directed along the positive x-axis. The electron is displaced 0.5m in the direction opposite E.

a. Find the change in the electric potential between the point of start and finish.

b. Find the change in the potential energy of the electron.

c.Find the speed of the electron then convert the energy values into eV.

2007-12-08 22:56:07 · 1 answers · asked by gladiator 1 in Physics

2007-12-08 22:55:11 · 4 answers · asked by waleed 1 in Physics

f(x) is a continuous function.
for all x |f(x)|<(or equals) 7
show that f(x)+2x=3 has at least one solution

could someone please explain this to me
show your work
thanks!

2007-12-08 22:54:39 · 1 answers · asked by Anonymous in Mathematics

2007-12-08 22:43:33 · 4 answers · asked by flygirl 2 in Physics

What happened on the appolo 13 mission, what went wrong and how did they fix it?
The real thing NOT the movie

2007-12-08 22:41:47 · 6 answers · asked by Zak N 2 in Astronomy & Space

What happens to the matter?
Where it goes?
What energy is released/absorbed?
What are Wormholes?
What are White holes?

2007-12-08 22:36:57 · 14 answers · asked by Ratnesh Sharma 2 in Astronomy & Space

2007-12-08 22:34:09 · 4 answers · asked by Anonymous in Mathematics

since electrons are so much smaller than protons, why are the magnitudes of their charges the same?

2007-12-08 22:23:52 · 3 answers · asked by Anonymous in Physics

hi can anyone help me do this as im new to this kind of maths could u show me the calculations as well please THANK YOU 10 POINTS FOR GOOD ANSWER !!!


HERES THE Q!!
http://i136.photobucket.com/albums/q200/batista981/kirchogffsfsf.jpg

2007-12-08 22:19:09 · 4 answers · asked by kerbycarla 1 in Mathematics

need help figuring out how many hours i volunteered

2007-12-08 22:08:44 · 14 answers · asked by lovelucy08 2 in Mathematics

2007-12-08 22:06:20 · 6 answers · asked by Anonymous in Mathematics

2007-12-08 22:06:03 · 5 answers · asked by Anonymous in Astronomy & Space

Silicon has no compounds in which the silicon atom forms double bonds with other elements. Phosphorus, by contrast, does form double bonds with other elements. Suggest why silicon and phosphorus are different in this respect.

2007-12-08 22:05:02 · 4 answers · asked by ebony 2 in Chemistry

2007-12-08 22:04:35 · 2 answers · asked by Anonymous in Astronomy & Space

what happened to you?

2007-12-08 21:59:42 · 5 answers · asked by Anonymous in Weather

2007-12-08 21:55:12 · 5 answers · asked by Anonymous in Zoology

2007-12-08 21:52:18 · 11 answers · asked by Angchok 1 in Other - Science

2007-12-08 21:47:41 · 12 answers · asked by Anonymous in Earth Sciences & Geology

? What is the feeling?

2007-12-08 21:46:41 · 4 answers · asked by cucumis_sativus 5 in Weather

helppppppppppppp

2007-12-08 21:45:28 · 8 answers · asked by sarah 1 in Mathematics

2007-12-08 21:42:59 · 7 answers · asked by vdfarms2003 2 in Other - Science

2007-12-08 21:40:48 · 2 answers · asked by jillian d 1 in Chemistry