Science & Mathematics - 30 January 2007

2007-01-30 08:54:04 · 4 answers · asked by maria i 1 in Geography

2007-01-30 08:51:35 · 10 answers · asked by MS 4 in Mathematics

Since charge is conserved why is there no return?

2007-01-30 08:51:34 · 7 answers · asked by Anonymous in Physics

2007-01-30 08:51:31 · 3 answers · asked by Anonymous in Earth Sciences & Geology

which of the following matrices have linearly independent columns:
Matrix A:
row 1: 1 1 0 0
row 2: 1 1 0 0
row 3: 0 0 1 0
row 4: 0 0 1 1

Matrix B:
row 1: 1 0 0
row 2: 1 0 0
row 3: 0 1 0
row 4: 0 0 1

Matrix D:
row 1: 1 0
row 2: 1 0
row 3: 2 5
row 4: 0 0

Matrix N:
row 1: 1
row 2: 2
row 3: 3
row 4: 4

Matrix F:
row 1: 1 5 6
row 2: 1 5 6
row 3: 0 7 2
row 4: 0 0 9

Matrix H:
row 1: 1 0 2 2 6
row 2: 1 0 2 2 6
row 3: 7 9 3 9 -1
row 4: 0 0 0 3 -7

matrix G:
row 1: 1 0 5 2
row 2: 1 0 5 2
row 3: 2 5 7 9
row 4: 0 0 0 3

2007-01-30 08:50:20 · 3 answers · asked by SphinxEyez999 2 in Mathematics

Can anyone help me with these radical equations?
[Radical]4x+17 + [Radical] x +7 = [Radical] x + 2

Where [Radical] means the radical, and 4x+7 and x+ 7 are under separate radicals
Please!

2007-01-30 08:49:50 · 2 answers · asked by Anonymous in Mathematics

I havea starter from a 220 volt motor on a doe machine. The contactor will pull in by bypassing the amperage part. We think it may be wired wrong. do you have a wiring diagram for a starter?

2007-01-30 08:49:33 · 1 answers · asked by Anonymous in Engineering

2007-01-30 08:49:29 · 2 answers · asked by king 1 in Mathematics

What are the forces that make soccer balls curve when kicked? What materials are soccer balls made with ?

2007-01-30 08:49:06 · 5 answers · asked by Anonymous in Engineering

As comets are just "dirty snow balls." Would it be possible for humans to make one and send it on a calculated orbit around the Sun so one could observe a light trail from earth. Do they have to be of a certain size to sustain a trail of light before they vapourise or before they can be called "comets" ?

2007-01-30 08:48:22 · 5 answers · asked by M J 3 in Astronomy & Space

Is a Zebra black with white stripes or white with black stripes

2007-01-30 08:47:32 · 2 answers · asked by greekmanuk81 2 in Zoology

2007-01-30 08:47:26 · 3 answers · asked by dayana 1 in Geography

find f-g and g-f?

2007-01-30 08:46:57 · 1 answers · asked by king 1 in Mathematics

4 / (X-5) - (1/3) = -8 / (3X-15)

(Is it 3x-15) If so, I will multiply this by what? I don't get this equation .. If you don't understand it how it is written...


problem 19 of this page is the one that I'm talking about

http://online.math.uh.edu/Math1310/ch2/s21/index.html

Where it says "Exercises" click on it

PLEASE HELP ME!!!

2007-01-30 08:46:56 · 3 answers · asked by Rayados Monterrey 2 in Mathematics

Technology today should be much better than the primitive 1960's so why can't we repeat the feat?.

2007-01-30 08:46:45 · 12 answers · asked by squeaky 3 in Astronomy & Space

the physical meaning of differntiation is finding the rate of change of one variable with respect to another variable. How would you explain integration in a similar sentence ?

2007-01-30 08:45:22 · 5 answers · asked by prashant2100 2 in Mathematics

2007-01-30 08:43:11 · 1 answers · asked by Anonymous in Biology

Many scientists beleive that the universe is anything between 12 and 18 billion years old. Ok then before that what did exist. Many say nothing others say maybe even another universe.
What do you think?

2007-01-30 08:42:47 · 11 answers · asked by Anonymous in Astronomy & Space

I do not know if it's possible. This would be connected to your brain, not replace it. And no cost to you, 100% covered by your insurance.
Unseen colors would be "converted" to visible ones, and similarly with sounds. You'd see in the dark, and no longer need eyeglasses or contact lenses.
Your memory would have more "storage space", good when actors must know their lines. Quiz games on TV would be easier despite the time limits. And imagine not needing to bring a written shopping list.
You'd be more free to be creative because the device is already helping your logical and fear-based thinking. For example, it might be pre-programmed with safety rules and typical causes and effects. You could do more math without a calculator.
Your health could be monitored, including medicine reminders. The device would reduce or cancel out epileptic seizures.
You'd notice body signals sooner such as for pointing, walking closer, or avoiding danger.

2007-01-30 08:40:05 · 13 answers · asked by rush&rut 2 in Other - Alternative

isn't that proof?

2007-01-30 08:39:26 · 7 answers · asked by Anonymous in Astronomy & Space

Before u make any wild guesses,a humble reminder->We can see the Stars lightyr away

2007-01-30 08:38:54 · 15 answers · asked by Sohel J 1 in Astronomy & Space

In 1993 the spacecraft Galileo sent home an image of asteroid 243 Ida and an orbiting tiny moon (now known as Dactyl), the first confirmed example of an asteroid-moon system. In the image, the moon, which is 1.5 km wide, is 100 km from the center of the asteroid, which is 55 km long. The shape of the moon's orbit is not well known; assume it is circular with a period of 27 h.

(a) What is the mass of the asteroid?
(b) The volume of the asteroid is 14,100 km^3. What is the density (mass per unit volume) of the asteroid?

The answers are:
(a) 6 x 10 ^ 16 kg
(b) 4 x 10 ^ 3 kg/m^3
but I don't know how to get these answers, please help me!

2007-01-30 08:38:39 · 1 answers · asked by afchica101 1 in Astronomy & Space

2007-01-30 08:38:02 · 4 answers · asked by MOH Alkirshy 1 in Engineering

2007-01-30 08:35:49 · 7 answers · asked by jwood 1 in Zoology

If the density of a 40% mass solution of ethylene glycol in water is 1.0514 g/mL, at 20 degrees C, what is the molarity?

Ok, so I researched and found that ethylene glycol is C2H6O2, which when I calculated, resulted in a molar mass of approximately, 62.08g/mol.

Now, should I multiply

62.08g/mol x 1.0514 g/ml x 1000ml/1L x .4

I think I am approaching this incorrectly...any ideas what I am doing wrong?

2007-01-30 08:34:41 · 2 answers · asked by Anonymous in Chemistry

2007-01-30 08:32:14 · 3 answers · asked by jwood 1 in Zoology

michingon just got a load of snow and i didn't have school today>> what about you???

2007-01-30 08:32:13 · 12 answers · asked by Sarah Martinez 3 in Weather

I do not have a map for this question! Please help!!!!!!!!!!!!!!

2007-01-30 08:30:48 · 5 answers · asked by Caitlyn C 2 in Earth Sciences & Geology

2007-01-30 08:30:17 · 6 answers · asked by naenae 1 in Physics

AlCl3(aq) + 4NaOH(aq) → NaAlO2 (aq) + 3NaCl(aq) +2H2O(l)?

Also how did you derive at this answer?
Are there conversion factors involved?

2007-01-30 08:29:57 · 3 answers · asked by San Fran Kid 2 in Chemistry