Science & Mathematics - 28 November 2006

9x+4y-z=0
3x-2y+4z=6
6x-8y-3z=3

2006-11-28 14:46:13 · 5 answers · asked by Anonymous in Mathematics

I am initiating a website to reach and communicate with any theoretical physicist in the world, albeit my communications will be in the English language. I would like to get an idea of the possible number in all? disciplines of physics I would like to communicate with.

2006-11-28 14:42:49 · 2 answers · asked by Anonymous in Physics

If i wanted to keep my coffee hot should i add the cream as soon as i get it or when i'm ready to drink it?

2006-11-28 14:39:33 · 8 answers · asked by kp000000 1 in Physics

At a rock concert, a sound meter registers 130dB when it is placed 2.80m directly in front of a loudspeaker. Recall that the surface area of a sphere is given by 4 pi r^2. The power is given as 985 Watts. Determine how far from the loudspeaker the meter must be in order that it would read only 90dB.

My professor started out the problem with this:

B (letter betta) = 10 log Intensity + 120.

Is the 120 supposed to be a 130? How would you solve this? Is my professor wrong using a 120. Maybe a typo from him?

2006-11-28 14:38:56 · 1 answers · asked by Sir Guitarist 2 in Physics

them seperate to the orignal colors again? I have tried oil with food coloring mixed with water and food coloring, this did not work. I have tried oil with oil paint mixed with water and food coloring, this did not work. Please let me know if anyone has a suggustion.

2006-11-28 14:38:11 · 7 answers · asked by TlC 1 in Physics

2006-11-28 14:34:32 · 6 answers · asked by Kristen P 2 in Astronomy & Space

2006-11-28 14:32:10 · 7 answers · asked by viper7721 1 in Weather

2006-11-28 14:31:07 · 7 answers · asked by felix l 1 in Medicine

If you were driving at the speed of light and turned on your headlights what would happen and why????/

2006-11-28 14:30:28 · 7 answers · asked by rahbonzy 2 in Physics

That is, circumference is to circle as __________ is to sphere.

2006-11-28 14:30:25 · 7 answers · asked by MNL_1221 6 in Mathematics

How many of these have their digits in decreasing order?

I believe an algorithm should be used but not sure how, especially with decreasing order.

2006-11-28 14:28:19 · 7 answers · asked by heatwave_lmj70 1 in Mathematics

I want to know what is 1 called? What's it's special name? Please help! I'll get extra credit :)

2006-11-28 14:24:19 · 5 answers · asked by Anonymous in Mathematics

If x denotes the length of a side of an equilateral triangle express teh area of the trinagle as a function of x.

I need the steps on how to figure this out. Thanks!

2006-11-28 14:22:46 · 10 answers · asked by Hannah 1 in Mathematics

"Charles Law", I understand the formula and equation, just a little confused on this one.
Hydrogen gas was cooled from 150* C to 50* C. Its new volume is 75 mL. What was its original volume? PLEAse help.

2006-11-28 14:22:12 · 2 answers · asked by B-Rad 4 in Chemistry

I am hoping for a white christmas this year. I live 45 min North of Boston where it is prone to snow but we have had nothing yet? Is there a good site to see if & when we will get some snow? Especially for x-mas..

2006-11-28 14:21:47 · 2 answers · asked by Jenna 2 in Weather

well im a sophmore in highschool and im in Ag Biology...and my teacher is makeing us do a Science fair project....and i need some good ideas...something not expensive but really interesting....i have nooo clue what to do...but it has to be something Ag related like Animals, plants....ect...any ideas please? or where i can look?

2006-11-28 14:21:36 · 7 answers · asked by Anonymous in Biology

1)
-the formation of ice from distilled water
-producing a thin film of soap solution
-a coughing fit during a chem test
-cooking an egg

2) What means "yeilds" or "produces" in a chemical equation?
-reactants
-products
-arrow symbol
-precipitate

3)A precipitate
-is a solution created when two materials are mixed
-is a reaction that gives off heat
-forms when light is given off during a chemical reation
-is a solid produced when chemicals dissolved in water react

4) A chemical change
-occurs when electricity is passed through the object
-occurs when anything is heated
-occurs when a substance is changed into a new substance
-as any situation involving chemicals

2006-11-28 14:21:30 · 4 answers · asked by margarittanosalt 2 in Chemistry

Match the words to the appropriate blank in the sentences

1. Stars are packed closely togerther in groups of a few hundered thousand in ____________

2. Our Milky Way galaxy is one of the ________

3. The circular but relatively flat portion of the galaxy is the ______

4. The first portion of the galaxy to form was the _______

5. The_________ stand out because they shine brightly with light from massive young star and glowing clouds of gas and dust.

6. Stars orbiting in the ________ near the galaxy's center can have highly inclined orbits


A. Halo

B. Spiral galaxies

C. Disk

D. Spiral arms

E. Bulge

F. Globular Clusters

2006-11-28 14:20:19 · 2 answers · asked by arvinchung 1 in Astronomy & Space

I'm referring to the WTC and building 7.

2006-11-28 14:19:58 · 15 answers · asked by Anonymous in Engineering

please explain

2006-11-28 14:19:01 · 4 answers · asked by Anonymous in Biology

What is a modular form, in simple terms?

2006-11-28 14:14:36 · 3 answers · asked by Star Wars fan-kid 1 in Mathematics

2006-11-28 14:14:21 · 19 answers · asked by Anonymous in Astronomy & Space

here it is, the school record for points scored in a basketball game season by one player is 462. maria has 235 points so far this season, how many more does she need to break the record? thanks.

2006-11-28 14:13:51 · 5 answers · asked by catmuffin 1 in Mathematics

this is what i have but i dont think its right
(n+7)(n)=15
does any one know an alternative way

2006-11-28 14:11:41 · 9 answers · asked by mher713 2 in Mathematics

2006-11-28 14:11:34 · 7 answers · asked by Dave 4 in Earth Sciences & Geology

2006-11-28 14:11:31 · 4 answers · asked by Anonymous in Engineering

In my algebra 2 class my teacher is starting to teach us the System of Matrix and Matrices or something like that...I don't get it.

2006-11-28 14:11:07 · 2 answers · asked by spanky 1 in Mathematics

OK. I have laundry detergent that comes in a clear bottle. when it is in the bottle it looks yellow. when i pour it into my hand it is purple. why?

2006-11-28 14:10:23 · 3 answers · asked by jlc2006 1 in Physics

2006-11-28 14:08:50 · 1 answers · asked by Dave 1 in Mathematics

2006-11-28 14:08:33 · 3 answers · asked by Luke S 1 in Earth Sciences & Geology