English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

Science & Mathematics - 24 September 2006

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

there is plenty of evidence that space itself ( the universe ) is expanding. if so, shouldnt it mean that matter ( the atoms themselves ) are expanding in size ( as they exist within the fabric of space ) ? please post your thoughts ( i would prefer professionals only )

if matter also expands, then why does the distance between objects increase ? if only the distance increase, then doesnt matter occupy a position "independent" to space ( instead of existing within it [ as it is believed ] ?

i believe the key to understanding this paradox is the next step in theoretical physics.

2006-09-24 16:19:45 · 11 answers · asked by fullbony 4 in Physics

I need some help to solve this math question.
Z is a complex number.
Z= a+bi
Z²=x+yi
Prove that 2x²=(a²+b²)^(1/2) +a

2006-09-24 16:15:45 · 7 answers · asked by animesongs_001 1 in Mathematics

what is the GCF of 84 and 126?

2006-09-24 16:14:38 · 19 answers · asked by Anonymous in Mathematics

2006-09-24 16:11:50 · 5 answers · asked by Kailyn N 1 in Chemistry

fv

2006-09-24 16:08:37 · 12 answers · asked by jeff f 1 in Mathematics

The takeoff speed of a jetliner is 360 km/h. If the jetliner is to take off from a 2100 m long runway, what must be the (constant) acceleration along the runway?

2006-09-24 16:08:22 · 5 answers · asked by Olivia 4 in Mathematics

I have a water fall with a 10' drop and the water flow is 2" deep x 40" wide. I could pipe longer and have more drop.

2006-09-24 16:06:31 · 9 answers · asked by Richard L 1 in Engineering

How do I isolate dT from: 1/2(aB)(dT)^2=1/2(aA)(VA)+dT(VA) See details for more info. Desperately need help!!

"Car A and B start side by side. At t=0 A begins to accelerate at a constant rate, which continues for time tA unti it reaches speed vA, at which it continues travelling at constant speed vA. At the same moment A reaches speed vA, B takes off after A, accelerating at a constant rate aB. At t = t*, car B passed car A."

In an attempt to solve the above question to find (t*- tA), or (dT), I have the following formula, AVOIDING to use t* or tA because that would make the equation more complex:

position of B at any point of time: 1/2(aB)(dT)^2
position of A at any point of time (since the passing of car B is after tA): 1/2(aA)(VA)+ dT(VA)

Then the point of crossing would be:
1/2(aB)(dT)^2=1/2(aA)(VA)+dT(VA)

However, I can't isolate dT to determine the time elapsed from the moment B begins to move. I need to know how to proceed or where's a mistake. I'm spent and exhausted.

2006-09-24 16:03:19 · 5 answers · asked by Obsidian A 2 in Mathematics

This is on my "To Do List"...

2006-09-24 16:02:12 · 11 answers · asked by Buzz Lightyear 1 in Astronomy & Space

0

square root of (x-9) + square root of (x) = 1

and

2 (square root of (x-3)) + square root of (3x-5) = 8

2006-09-24 16:00:28 · 8 answers · asked by Need Help 2 in Mathematics

im trying to input 6.022*10^23 so i can just hit a button whenever i need it

2006-09-24 15:57:57 · 4 answers · asked by mintai2003 2 in Chemistry

2006-09-24 15:55:30 · 4 answers · asked by stevemoerschell 1 in Other - Science

Me? Creation.

2006-09-24 15:53:08 · 15 answers · asked by Anonymous in Other - Science

Mine is around 2 1/2 in. when erect. I don't what size it shoud be. please help. pictures help too. ( you know how to reach me ) I guess this where smeone would post a question.

2006-09-24 15:50:23 · 10 answers · asked by will 1 in Biology

2006-09-24 15:47:25 · 4 answers · asked by C.C. 4 in Engineering

The takeoff speed of a jetliner is 360 km/h. If the jetliner is to take off from a 2100 m long runway, what must be the (constant) acceleration along the runway?

2006-09-24 15:45:00 · 1 answers · asked by Olivia 4 in Physics

2006-09-24 15:42:46 · 5 answers · asked by Anonymous in Engineering

Could you put it in simple terms? And don't tell me, "Just because". -.-"

2006-09-24 15:39:44 · 7 answers · asked by Sonatre 2 in Mathematics

their every where ! every time i open a window or door they attack my house ! i must of killed 100's of them this week alone !

2006-09-24 15:37:37 · 3 answers · asked by Anonymous in Other - Science

will we meet alien life forms in our lifetime?do you think we'll be able to coexist in peace? how will that change us as a species, knowing we aren't unique?

2006-09-24 15:37:01 · 14 answers · asked by kelleygaither2000 1 in Astronomy & Space

Prove that where
a^2 +b^2 +c^2 ........ = z^2 ;
a, b, c........and z, all of them can not be prime numbers > 3, unless at least all alphabet letters are used up for the equation - in other words, LHS ought to have at least 25 appropriate prime numbers

2006-09-24 15:35:45 · 2 answers · asked by small 7 in Mathematics

the equation is square root of (5x-3) = square root of (2x+3)

2006-09-24 15:34:58 · 7 answers · asked by Need Help 2 in Mathematics

misnomer is a name that has nothing to do with the name of the item. (example- a peanut is a misnomer because it isnt a nut.)

2006-09-24 15:34:03 · 1 answers · asked by totalstuff8 2 in Chemistry

fedest.com, questions and answers