Science & Mathematics - 26 July 2007

what do you get when you divide 5a^2+6a-9 into 25a^4+19a^2-a-78

2007-07-26 16:04:31 · 2 answers · asked by percy m 1 in Mathematics

2007-07-26 16:03:13 · 12 answers · asked by spicysaucylatina 4 in Earth Sciences & Geology

http://www.cnn.com/2007/US/07/26/spaceport.blast/index.html

Apparently they were going to cold fire a nitrous oxide tank that was going to be used in a motor for a Virgin Galactic craft. The tank inexplicably exploded, killing two engineers and putting four others in critical condition. My father who works on the project at Scaled said the blast completely leveled their testing pad. Luckily, he was going to watch up close, but moved back to the bunker before the explosion happened.

2007-07-26 16:02:42 · 2 answers · asked by Anonymous in Astronomy & Space

I thought I understood this until I actually tried to do it. Okay, so let me get this straight. Say, to get y alone you have to multiply each equation by the coefficient of the opposite equation? In my book, it shows the bottom number being negative. Why?

Here, perhaps if I give an actual problem it'll be easier to explain my confusion.

Here's an example:
(1) 5x+3y=4
(2) 7x-4y=22

In my textbook, they multiply (1) with 4 and equation 2 with 3.
This is where I get confused. In some of these example problems they use a negative for the bottom number and I cannot figure out why. Can someone explain to me what's going on at this step because my book doesn't do a good job in explaining it.

In another example they do
1) -12x+9y=5
2) -8x+6y=-11

and they multiply the first by -2 and the second equation with 3. WHY? I don't understand what's going on here at all!

2007-07-26 16:01:31 · 3 answers · asked by Anonymous 1 in Mathematics

2007-07-26 16:01:20 · 10 answers · asked by nolajazzyguide 4 in Astronomy & Space

2007-07-26 16:00:04 · 15 answers · asked by Anonymous in Weather

4a^4+6a^3b^2+2a^2b^3

my answer is 2a^2(b^3+3ab^2+2a^2
but im wrong may you correct me.

2007-07-26 15:58:54 · 5 answers · asked by percy m 1 in Mathematics

what do you think

http://www.youtube.com/watch?v=bRLEtC9yIFI

2007-07-26 15:57:11 · 2 answers · asked by Anonymous in Astronomy & Space

can a capacitor voltage be higher than the source's voltage? how? What about Kirchhoff's loop rule?

2007-07-26 15:56:04 · 8 answers · asked by Anonymous in Physics

arent viruses just a random collection of elements that are reproduced by cells when they accidentally achieve the correct shape & composition to trigger the reproductive mechanisim of the cell which then manufactures them along with a bit of the cells own dna. if so should'nt viruses be classified as a defect in the cellular reproductive system instead of as a living organisim?

2007-07-26 15:55:01 · 10 answers · asked by Who Dat ? 7 in Biology

2007-07-26 15:53:28 · 5 answers · asked by SAMY B 1 in Biology

true or false

2007-07-26 15:53:19 · 2 answers · asked by bob 2 in Astronomy & Space

Doin whatever a spider pig does!!

I wonder what it does...

2007-07-26 15:51:40 · 14 answers · asked by sillygoose112393 4 in Zoology

2) Two electrons in an atom are separated by 1.6 x 10 ^-10 m, the typical size of an atom. The coulomb constant is 9 x 10^9 N *m^2/C^2. What is the force between them? Answer in units of N.

I tried using coloumbs law but not sure

2007-07-26 15:51:38 · 2 answers · asked by Anonymous in Physics

here i have uploaded a table

http://img512.imageshack.us/my.php?image=scan0002pl2.jpg

i dont understand the meaning of the problem statement

"Each university is represented by three of its best colleges".

what it means in this context ?

does it mean universirt1 has 3 colleges . university2 and others also have 3 collges ....then there should have 3x5 = 15 colleges !!

I think i am understanding it wrongly.

someone please help me to understand the meaning of that problem-statement

2007-07-26 15:51:21 · 2 answers · asked by calculus 1 in Medicine

Find the first partial derivatives of the function at the given point.
help appreciated!
a. g(x,y) = sqrt(x^2+y^2) ; (3,4)

b.f(x,y) = e^xy (e to the xy) ; (1,1)

2007-07-26 15:46:46 · 2 answers · asked by jeff 1 in Mathematics

how to identify:
1. Co2
2. Pcl3
3. HCl
4. CaCl2
5. Pbl
using the electronic configuration and electron dot formula??

2007-07-26 15:39:41 · 4 answers · asked by arash17 1 in Chemistry

Which would win in a duel to the death and why?

2007-07-26 15:33:22 · 7 answers · asked by Anonymous in Zoology

They both moan like hell when they come, and take the house when they leave.

2007-07-26 15:27:10 · 8 answers · asked by Ghost Rider 1 in Earth Sciences & Geology

A friend and I are planning on writing a book about how two people bring about the end of the world. It involves a rod being shoved through the earth. I want to know how big it would have to be in order to cause damage. Perhaps, with the right magnetic charge it can screw with the elements making up the planet. Just give your thoughts.

2007-07-26 15:24:55 · 7 answers · asked by Brittany P 2 in Earth Sciences & Geology

2007-07-26 15:24:35 · 12 answers · asked by Denise 1 in Astronomy & Space

i dont understand this graph and the question .

Here i have uploaded

http://img507.imageshack.us/my.php?image=scan0001zj3.jpg


kindly , please help

what does it mean by turnover as per the question ?

there is no "turnover " mentioned in the graph and so i am confused.

please help

2007-07-26 15:21:22 · 3 answers · asked by calculus 1 in Mathematics

2007-07-26 15:19:09 · 6 answers · asked by Anonymous in Weather

...that are symmetric with (a) the x axis, (b) the y axis, and (c) the origin.

I have no clue how to do this...I need some help 4realz...

2007-07-26 15:09:14 · 5 answers · asked by jaz 5 in Mathematics

if the resistance of the bulb is so high it means a tiny current flows in to it , then how does the bulb glow with such a tiny current?

2007-07-26 15:07:14 · 8 answers · asked by sarita s 1 in Physics

The electron gun in a television tube is used to accelerate electrons( mass of 9.10939x 10^-31 kg and charge of -1.60218X10^-19 C) from rest to 2 X 10^7 m/s within a distance of 5.5 cm. What is the electric field require? Answer in units of N/C.


I got 2.2 x10-13 but im not sure if I did it right can someone check me please

2007-07-26 15:06:53 · 1 answers · asked by Anonymous in Physics

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.

y = 0, y = x(6 - x) about the axis x = 0

V = integral(low: a, up: b) A(x) dx

2007-07-26 15:02:33 · 2 answers · asked by Anonymous in Mathematics

(square root) (45 x^8)

Assume that all variables represent positive real numbers.

2007-07-26 15:00:02 · 5 answers · asked by Amy 1 in Mathematics

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.

y = 6x^2, x = 1, y = 0, about the x-axis

V = integral (low: a, up: b) A(x) dx

2007-07-26 14:58:48 · 2 answers · asked by Anonymous in Mathematics

A ball of radius 17 has a round hole of radius 6 drilled through its center. Find the volume of the resulting solid.

(Subtracting one from the other is incorrect)

V = integral (low: a, up: b) A(x) dx

2007-07-26 14:53:25 · 6 answers · asked by Anonymous in Mathematics