Science & Mathematics - 28 December 2007

1.x^2+xy^2-5=0
Find the value of dy/dx at the point (1,2)

2. Also i had trouble integrating (x+3)/x^2

thanks very much for any help.

2007-12-28 23:59:23 · 3 answers · asked by Anonymous in Mathematics

2007-12-28 23:58:38 · 4 answers · asked by padmesh v 1 in Chemistry

2007-12-28 23:24:57 · 2 answers · asked by Gopi K 2 in Zoology

What would you like to find?

2007-12-28 23:23:10 · 15 answers · asked by Anonymous in Weather

can we make a running motor without using any energy.using permanet magnets. this is possible or not.

2007-12-28 23:22:46 · 8 answers · asked by sanjeev dad 1 in Physics

Everyone know you can extract some metals with carbon reduction from their oxide state. In this reaction, carbon would take the oxygen from the oxide and reduct the metal. But I don't understand why carbon can take the oxygen from the oxide. Why the bond in carbon dioxide is too strong? Also, can I use other elements to replace carbon? Like can I use silicon and form silicon oxide, or can I use some nitrogen compound with weak bond that can be break in low temperture and form nitrogen oxide?

2007-12-28 23:11:18 · 5 answers · asked by Anonymous in Chemistry

Anyone who knows alot about physics, please help me.
I understamd the idea of 'spin' but how can a particle have a spin of 1/2? I do not understand how this works. If you know, please tell me. Also, I know what Pauli's exclusion principle is, but how does it work and why does it happen?
Thanks in advance for your help.

2007-12-28 23:10:02 · 3 answers · asked by Anonymon 4 in Physics

When put a magnesium into steam, magnesium oxide is formed. When you add a potassium into water, potassium displace the hydrogen in water molecule and form potassium hydroxide + hydrogen. Why the hydrogen in the hydroxide ion would not be displaced by potassium? Calcium in group II form hydroxide ion in water too. Why?

2007-12-28 23:00:31 · 2 answers · asked by Anonymous in Chemistry

2007-12-28 22:56:03 · 6 answers · asked by question legend 2 in Mathematics

Desulphators are made to stir the battery acid up get the sulphates off the bottom off the battery and mix it with the acid,but does it work ?

2007-12-28 22:39:38 · 2 answers · asked by aiwa1944 1 in Physics

Any help and steps in solving this would be appreciated!! Thanks!!!


The total cost in dollars for a certain company to produce x empty jars to be used by a jelly
producer is given by the function C(x) = 0.2x + 30,000. Find C(80,000) the cost of producing
80,000 jars.

2007-12-28 22:31:59 · 7 answers · asked by Anonymous in Mathematics

2007-12-28 22:21:44 · 1 answers · asked by Hasniza N 1 in Astronomy & Space

please tell me,how to find
1.local max
2.local min
3.absolute max
4.ab min

2007-12-28 22:19:37 · 3 answers · asked by Anonymous in Mathematics

pLEASE PROVIDE LINKS AND INFO OR JUST NAME TOPICS.THIS IS HOLIDAY HOMEWORK.THANKS IN ADVANCE!!!

2007-12-28 22:16:05 · 2 answers · asked by Anonymous in Chemistry

2007-12-28 22:15:42 · 10 answers · asked by chelsea 1 in Biology

I am an amateur meteorologist and would like a factor to convert inches of mercury to millibars and back. Thank you.
Michael C

2007-12-28 22:15:28 · 4 answers · asked by Anonymous in Weather

http://www.free-picture-host.com/viewimage.php?file=/images/FVUWcj1198925619.jpg
(nid urgent help can't do it)

2007-12-28 22:07:52 · 3 answers · asked by Stormy Knight 1 in Mathematics

How and where is this done?

2007-12-28 22:05:21 · 2 answers · asked by Mia S 1 in Chemistry

2007-12-28 21:52:42 · 7 answers · asked by Chris 3 in Mathematics

2007-12-28 21:48:36 · 10 answers · asked by Anonymous in Astronomy & Space

I mean, what he says about the position of the sun and the stars during the solstice and equinox, and what an Age is, and all the other scientific stuff. Not the religious stuff, but the stuff he is claiming as astrological fact. Does he have that part correct?

I greatly appreciate any help I can get on this.

http://www.youtube.com/watch?v=TjGkRFFBd0A
http://www.youtube.com/watch?v=A_E0vfP79yE
http://www.youtube.com/watch?v=pyXIeB1qI6w

2007-12-28 21:44:00 · 5 answers · asked by Ms America 2 in Astronomy & Space

2007-12-28 21:35:58 · 21 answers · asked by iRa Furor 2 in Zoology

no mater how often i ask about how the tide is formed i never get an answer that satisfies me, there is 2 tides in 24 hours, dut the moon only goes round earth once in 24 hours

2007-12-28 21:23:30 · 4 answers · asked by Anonymous in Earth Sciences & Geology

yes, thats right I said advantages. Since forever, I've been hearing about how the rainforest is being cut down and what the outcome of that is. well, if its so bad, why don't they just stop? well obviously there is some good for it then. what are the advantages of cutting down the rainforest?

2007-12-28 21:02:21 · 5 answers · asked by Danuta F 3 in Biology

Im a C1 A level student, but I just cant get my hang around it!!!

Please do both of these qus: (just copy and paste the ² symbol from here for your answer).

1) 2x² + 3x -5

2) -x² +6x +9

Especially for the first one, please show EVERY single step.

Thank you vvvvv much for your help =D
Early Happy New Year!!!

2007-12-28 21:01:21 · 9 answers · asked by ღ♥ღ latoya 4 in Mathematics

e^x - 3x^2 = 0

Solve for x.

(I know the answer, but am stuck on how to get there algebraically rather than graphically.)

Thanks!

2007-12-28 20:51:13 · 6 answers · asked by McMurphyRP 3 in Mathematics

I want to study engineering at some point. Should I apply for jobs as a CAD operator to get some sort of experience ?

Are companies going to be willing to someone who needs training without experience ?

I was hoping to be able to study at night for a few years.

What do I need to get a job as a CAD operator and get into drafting ?

Civil is the desired discipline ?

I'm 24 and I have a non engineering degree.

2007-12-28 20:36:31 · 6 answers · asked by Anonymous in Engineering

If the earth were a perfect sphere how far above the surface of the earth would your eyeball have to be to see exactly half of the universe?

http://answers.yahoo.com/question/index;_ylt=Ah0KkAXEBU5hVh9FFOFi2wvsy6IX;_ylv=3?qid=20071228184320AACM3a4

2007-12-28 20:19:34 · 7 answers · asked by skip 4 in Physics

If we flash back to one hundred years ago people would of never thought any of this to be possible but only in science fiction. Flash forewording to now, what if we finally invent something that can be stored bigger on the inside like a 30 foot ladder fitting into a 3x3x3 cm box using alien technologies. Another good example would be a TARDIS (from "doctor who" where the inside is bigger than the outside) Could something like that ever be developed in the future? It would change storage of permanent data forever.

2007-12-28 20:19:25 · 5 answers · asked by Doctor Who? 1 in Other - Science

2007-12-28 20:17:03 · 3 answers · asked by SANJAY R 1 in Chemistry