Science & Mathematics - 18 November 2007

x^2+8x-20=0

2007-11-18 09:28:45 · 7 answers · asked by tricey7578 2 in Mathematics

2007-11-18 09:26:24 · 4 answers · asked by willwhit87 1 in Mathematics

If you go straight long enough will you end up where you were?

2007-11-18 09:24:30 · 9 answers · asked by Matthew H 2 in Astronomy & Space

The idea is already in a patent pending status. The device would need to be installed along the highways worldwide.

2007-11-18 09:23:52 · 1 answers · asked by rick e 1 in Engineering

Please help with this problem

2007-11-18 09:22:41 · 3 answers · asked by Tonie M 1 in Mathematics

completely with 8.0g of magnesium? 2Mg + O2 --- 2MgO
thanks for your help!!!!

2007-11-18 09:21:05 · 2 answers · asked by sarah 2 in Chemistry

I have a physics problem, seems simple but I am getting a different answer than the book.

Problem : A ball is kicked at 15m/s horizontally on a 45 deg hill. In how much time will the ball land on the ground?

Books answer is 5.1 sec. I don't know how they get this answer.

Thanks for the help in advance.

2007-11-18 09:20:10 · 1 answers · asked by KOTEHOK 3 in Physics

-There is a bus with 7 Girls
-Each girl carries 7 bags
-Inside each bag there is 7 cats
-Every cat has 7 kittens
-All cats have 4 legs each

Question: How many legs are in the bus?

*The number of legs will be your password for the
attachment. If you
succeed in opening the file make sure you write your
name. That will prove
you did your math correctly.


i have tried several things, and i cant solve it..help

2007-11-18 09:19:48 · 16 answers · asked by Anonymous in Mathematics

At STP, 762 ML of a gas has a mass of 1.02g. If the gas has an emphirical formula of CH3, what is the molecular formula of the compound.

2007-11-18 09:17:57 · 2 answers · asked by mikala m 2 in Chemistry

how do i factorise these:
1 - 4x+8
2 - m^2-n^2
2 - xy-x

ETC. how will i work them out with squares and fractions like: x^2/2 - x^3/4

2007-11-18 09:17:01 · 7 answers · asked by Anonymous in Mathematics

Is is safe to skydive on the moon? Theoretical question.

2007-11-18 09:14:17 · 5 answers · asked by Anonymous in Physics

1. Given A = (-2, -1, 0, 1) and B = (1, 2, 3), determine which of the sets of ordered pairs represents a function from A to B.
Choices are...
A. (-2, 1), (-1, 2), (-1, 3)
B. (-2, 1), (-1, 1), (0, 1) (1, 1)
C. All of these
D. (-2, 1), (-2, 2), (-2, 3)
E. (-2, 1), (-2, 2), (-2, 3) and (-2, 1), (-1, 2), (-1, 3) only

2007-11-18 09:13:09 · 1 answers · asked by wrongnumber 1 in Mathematics

I am doing a science project on leaves and i have a Amber Maple Leaf but I can't find any information on it becides the syrup. So I need some help and can you like have a website for me! Thank You!

2007-11-18 09:13:03 · 1 answers · asked by kaylcgirl 2 in Botany

What happens to stop the water from going out again?

2007-11-18 09:09:22 · 1 answers · asked by Anonymous in Physics

Use the integral method to show that the area of the triangle can be obtained by multiplying 1/2 of the base by the height.

2007-11-18 09:06:05 · 2 answers · asked by BOAZ 1 in Mathematics

2007-11-18 09:06:03 · 9 answers · asked by KT 2 in Mathematics

Is it possible with a very large umbrella to glide off of a small scaled surface like a tree? I have seen it in movies but i didnt know if it would really work or not

2007-11-18 09:04:15 · 2 answers · asked by matt m 1 in Engineering

The past has no real matter and neither does the future.

2007-11-18 04:04:25 · 2 answers · asked by Anonymous in Physics

2007-11-18 03:59:58 · 4 answers · asked by Paul W 1 in Mathematics

in the field of telecommunication

2007-11-18 03:56:40 · 3 answers · asked by Anonymous in Engineering

to my spine ????

2007-11-18 03:55:43 · 1 answers · asked by N N 1 in Medicine

at what temperature does ocean water turn to water vapor and clouds?.... I'm guessing it's quite a bit below boiling, as seems to be necessary in a 'still' to get the steam to become 'fresh' water..... so.... could we kill a couple of these birds by something like this?.... running salt water thru black pipes to warm up in the sunlight, maybe in the same place as the solar collectors for elec power?, then out to holding ponds with plastic over them for the condensate to collect and run off....moved by pumps powered by windmill turbines? seems like this would work good in the desert... hot days, cool nights for the condenseate to work?.... of course, we'd have to pump it from sea to desert, right?... same windmills?....

I'm prob pretty far out, but there's gotta be a way for us to get that water made useful to those who need it!!... got any other ideas out there?....

2007-11-18 03:51:09 · 2 answers · asked by meanolmaw 7 in Earth Sciences & Geology

Hello..okay so man-made light cast different colors, so what is the respective color of incandescent light and fluorescent light?

2007-11-18 03:46:30 · 4 answers · asked by TJ 1 in Physics

In a lab report, we were using Hess's Law to calculate enthalpies using a few reactions we did in class, one of which was magnesium in hydrochloric acid. The question was to explain why the change is exothermic.

What exactly is it about displacement reactions of metals in acids that makes them exothermic?


In this case,

Mg + 2HCl --> MgCl2 + H2 + xkJ

2007-11-18 03:45:06 · 4 answers · asked by Jeb 2 in Chemistry

I'm working on my chem homework, and there are two questions that I can't find about in my notes:

27. Which metal is most likely obtained by the electrolysis of its fused salt?

a. Au
b. Ag
c. Li
d. Zn

29. Which of the following elements can form more than one binary compound with Oxygen?

a. sodium
b. magnesium
c. iron
d. calcium

If you could please explain the answers too so I can understand it I would be very grateful. Thank you in advance!

2007-11-18 03:44:09 · 1 answers · asked by Meggie Beth 3 in Chemistry

it is just as cold in the south as it is in the noth now

2007-11-18 03:41:00 · 6 answers · asked by Anonymous in Weather

trying to find a formula about tires to calculate traction, then in turn a reverse formula that might indicate the drag the tire would create in towing.

2007-11-18 03:35:28 · 2 answers · asked by guywill03 1 in Engineering

i am a freshman in advanced classes. i want a difficult engineering project.

2007-11-18 03:35:03 · 2 answers · asked by spyder_paintballer24 2 in Engineering

2007-11-18 03:35:01 · 7 answers · asked by Anonymous in Mathematics

2007-11-18 03:34:12 · 2 answers · asked by Anonymous in Botany