Science & Mathematics - 10 October 2007

2007-10-10 20:31:03 · 3 answers · asked by AnonymousOne 2 in Earth Sciences & Geology

Do you think that urban community could be assimilate with an ecological system? If your answer will be "yes", what can destroy its equilibrium?

2007-10-10 20:25:20 · 3 answers · asked by momotzange5 4 in Zoology

I need to make a report on Uses of Mathematics in Management Sciences. Please help me find relevant articles on the internet.

2007-10-10 20:22:46 · 1 answers · asked by Wajahat M 1 in Mathematics

The last operation is to reciprocal, reciprocal is the mutliplicative inverse, so it could be called a product.

But reciprocal is dividing the answer into 1, so it could be called a quotient? Yes No? Hmmmm.....

I hate being thick :o(

2007-10-10 20:03:41 · 8 answers · asked by Miss M R Cook 1 in Mathematics

What is the volume of 9.2 x 10^25 molecules of SbH3(g) at STP?

2007-10-10 19:58:23 · 3 answers · asked by Anonymous in Chemistry

How will the human race meet its end? Pick one and elaborate the scenario.

1. Global war
2. Ecological disaster
3. Pandemic, viral, bacterial or parasitic
4. Asteroid impact
5. Black hole, solar disaster, or other cosmic threat.
6. Alien annhilation
7. Quantum mechanics accident

2007-10-10 19:58:15 · 12 answers · asked by Joel 2 in Astronomy & Space

Hi I would like to know how to solve the linear system equation x+2y+z=a2 , x+ y + 3z=a ,3x+ 4y +7y =10 how to solve this type of Equation

2007-10-10 19:53:48 · 2 answers · asked by Nur S 1 in Mathematics

2007-10-10 19:50:36 · 6 answers · asked by Mercury 2010 7 in Physics

HOLY CRAP, SO I'VE BEEN WORKING ON HOW TO SIMPLIFY THIS STUFF BUT I DONT UNDERSTANDDD?!!
EVERYTIME I TRY TO ANSWER I COME UP WITH THE WRONG ANSWER!!!!
CAN ANY OF YOU EXPLAIN WHAT TO DO STEP BY STEP :

a. 4(-3x-5)-(10+4x) =
b. -(2-x)-3(6+8x)-12=

i seriously have no clue , my answers are so off so please explain and (tell me why) as clear as possible!!
10 points to beessst answer thanks :)

2007-10-10 19:45:25 · 9 answers · asked by julia m 1 in Mathematics

2007-10-10 19:37:49 · 15 answers · asked by Anonymous in Physics

And why why ammeters are always connected in series!

2007-10-10 19:37:16 · 9 answers · asked by Andy mark 1 in Physics

In general, what is the difference between dy/dx and f ` (x)?

How about in this situation: "Find dy/dx" y= (x^3)(sin(5x)) ?

I presume there is no difference.

In what situation do they differ?

2007-10-10 19:26:13 · 8 answers · asked by Theava 2 in Mathematics

Solving equations using substitution.

2007-10-10 19:25:42 · 8 answers · asked by Anonymous in Mathematics

I am a healthy person. I don't have AIDS or any other terminal illness, but sometimes I just don't have an appetite when I should. However, my appetite is getting better with time and with me eating on a more regular basis. It just makes me furious to see all these legal speeds and appetite suppressants but NO appetite stimulants. The only one I've seen that was legal, you needed a prescription for and it could possibly cause kidney and liver damage. Marijuana is much safer. The government should just realize it and legalize it.

2007-10-10 19:25:40 · 2 answers · asked by UpTheDownwardSpiral 3 in Medicine

can u provide me the general equation for servo motor? thanks

2007-10-10 19:24:13 · 3 answers · asked by aaron 1 in Engineering

Logically, in a win/loss scenario with x number of teams, the average win/loss ratio for x# of teams shoul equal 1 (1 win for 1 loss).

But:
Team 1 = 10-5
Team 2 = 40-10
Team 3 = 2 -15
Team 4 = 3-25
(the fact that the total number of w/l for each team is different doesn't matter...look at it as more of a points for and points against scenario)

The total number of wins is 55 and the total number of losses is 55. The overall ratio of wins to losses is therefore 55:55 or 1:1 or 1.0 wins for every loss.

However, if you take the perspective that Team 1 has a 4.0 (4 wins for every 1 loss) Team 2 has a 2.0, Team 3 has a .13 and Team 4 has a .12.

The average of these ratios (4, 2, .12, .13) is not equal to 1 but it is greater.

I would like some help understanding why this is.

2007-10-10 19:22:03 · 4 answers · asked by John L 2 in Mathematics

1) How many grams of carbon are in 15.3 moles of tricarbon tetrahydride? (550.8 grams of C)

2) How many litres are in 0.00923 grams of O2(g)?
(6.5 x 10^-3)

3) How many moles of Br2(l) are contained in 250.0 mL of Brd(l) ? d= 0.72g/mL?
(1.13 moles of Br)

4) What is the density of NH3(g) at STP?
(0.758 g/L)

5) What is the molar mass of Al2(C2O4)3 x 4H2O?
what is the answer to this??? don't get it?

6) What is the volume of 9.2 x 10^25 molecules of SbH3(g) at STP?
I also don't get this one, please help, thanks!

2007-10-10 19:18:03 · 2 answers · asked by Anonymous in Chemistry

2007-10-10 19:17:33 · 3 answers · asked by Anonymous in Mathematics

You never hear people talk about it anymore. Anyone think that psychokinesis is real?

2007-10-10 19:14:00 · 14 answers · asked by Signilda 7 in Parapsychology

And how do you prove it without using a specific example.

2007-10-10 19:11:52 · 8 answers · asked by curiousgeorge 2 in Physics

2007-10-10 19:10:52 · 7 answers · asked by alex 1 in Mathematics

Every Halloween they have a tour of "haunted houses" and tell stories about them here. Is it possible that the whole town could be haunted? Things happen to me here that don't happen other places.. other towns..esp other states. I've gotten to where I have to ignore it.

2007-10-10 19:04:25 · 13 answers · asked by Deenie 6 in Paranormal Phenomena

2007-10-10 19:02:18 · 1 answers · asked by Anonymous in Mathematics

2007-10-10 19:00:25 · 8 answers · asked by Anonymous in Mathematics

An ice skater of mass m is given a shove on a frozen pond. After the shove she has a speed of v_1 = 2 m/s. Assume that the only horizontal force that acts on her is a slight frictional force between the blades of the skates and the ice.

Use the net work-kinetic energy theorem to find the distance the skater moves before coming to rest. Assume that the coefficient of kinetic friction between the blades of the skates and the ice is u^kin = 0.12. Explain your work. Thanks! :)

2007-10-10 18:58:51 · 1 answers · asked by Anonymous in Physics

a rocket is fired vertically from a well. A catapult gives it an initial speed of 80m/s at ground level. its engine then fires and it accelerates upward at 4 m/s^2 until it reaches an altitude of 1000 m. at that point its engines fail and the rocket goes into freefall with an acceleration of -9.8 m/s^2.

How long is the rocket in motion above the ground

What is its max altitude

what is its velocity just before it collides with the earth

(You will need to consider the motion while the engine is operating separately from the free fall)

Please help

2007-10-10 18:52:09 · 4 answers · asked by tuerving 2 in Physics

Tomorrow im going to take 2 sudafed PE pills (80 mg) and a 10 mg lexapro, will there be any conflicting problems?

2007-10-10 18:48:18 · 0 answers · asked by Anonymous in Medicine

2007-10-10 18:47:25 · 2 answers · asked by STUDY 3 in Engineering

okay a girl watches a train pass by. the cars of each train is 8.6 m long. the first one passes her in 1.5 s and the second in 1.1 s. Find the constant acceleration. Please explain how you approached this problem?

2007-10-10 18:46:47 · 3 answers · asked by tuerving 2 in Physics

Years ago ..my son was lifted off the bed while asleep. I had to push him back down.He was 13. A psychic had lived in the house at one time.(but I didn't know it)(No, I wasn't asleep and didn't imagine it.) Actually, it didn't scare me. It should have, but didn't. I didn't tell him for years.

2007-10-10 18:45:00 · 17 answers · asked by Deenie 6 in Paranormal Phenomena