Science & Mathematics - 26 September 2007

I live in FL and every once in a while I see a white cloud streak in the sky. I have always thought it was a jet fighter breaking into M1. I also thought it was a rocket launched by Kennedy Space Center until I saw two streaks recently side by side. Does anyone know what this is.. Just curious.

2007-09-26 03:54:12 · 3 answers · asked by Anonymous in Astronomy & Space

Just the standers latex balloons, nothing fancy.

2007-09-26 03:54:06 · 3 answers · asked by shreksdonkeyy 2 in Physics

I would like to see an equation for heat transfer in terms of velocity. If the velocity of the air flow doubles and everything else stays the same does the heat transfer double?

2007-09-26 03:48:51 · 2 answers · asked by dianpen7 1 in Physics

I'm lokking for this manual in Amazon but i dont fined it im looking for this or the web site that may be i can fined the answer of the question of the first 7 chapter from the Quantum Chemistry IRA N.LEVINE book(please this is something vrey vrey important for me im rely rely need it.

2007-09-26 03:47:57 · 2 answers · asked by rakan e 1 in Chemistry

If i needed to pump 900,000 litres of water per minute at 1,000 bars (14,500 psi), What horse power motor would I need.

Whats the calculation or equation that you use?

2007-09-26 03:46:16 · 5 answers · asked by Anonymous in Engineering

2007-09-26 03:44:51 · 13 answers · asked by El Diablo King Of Kings 3 in Physics

hi guys my name is jon im form malta.I just started school today and im in form 4.I need help how to study maths coz i have 2 years till my examns i want to do it paper "2A" for my job as a pilot i feel very sad the last result was 37/70 :-s

2007-09-26 03:44:30 · 3 answers · asked by Anonymous in Mathematics

2007-09-26 03:43:37 · 7 answers · asked by Jordan D 1 in Chemistry

2007-09-26 03:43:15 · 3 answers · asked by Jordan D 1 in Chemistry

Hi to all!

Hope someone could help me on this.I just want to check if my answers are correct; or if its the same with yours.

The problem is:

A 40Kg stone is dropped from a height of 150m.What is the PE and KE?

a) at t= 1 second

b) at a distance of 20m

Many Thanks!

2007-09-26 03:39:39 · 1 answers · asked by xpressmuzik5 2 in Physics

Fink k if the curve y = x^2 + k is tangent to the line y = 2x



I know the answer, but please EXPLAIN why the answer is what it is.

2007-09-26 03:34:27 · 4 answers · asked by BlueEyedGrl 2 in Mathematics

based on aromatic reaction..please explain how does the presence of nitro group in benzene effect the substitution of the next electrophile

2007-09-26 03:32:01 · 4 answers · asked by suser 1 in Chemistry

A can do a piece of work in 20 days while B alone can do it in 30 days. In how many days can A&B working together do it?

2007-09-26 03:31:44 · 11 answers · asked by as 2 in Mathematics

I know that I have seen some animals cry out in pain, but I was wondering if shedding tears and weeping while in emotional or physical pain was a uniquely human behavior. Does anyone here know?

2007-09-26 03:30:15 · 11 answers · asked by tangerine 7 in Zoology

When I say "full body hair" I mean enough to protect us against the elements, like a horse or a cat has.

Please think before you answer that "we wear clothes" - because there had to be sometime in history when the "clothing" was not available and we would have had to survive in conditions without it. if your theory is "evolution" then also consider that during the "evolutionary process" of becoming "less hairy" - what was the purpose of shedding the hair to replace it with another animals skin or a plant fiber.

o the "temperature" of the environment doesn't work either - plenty of other mammals ( such as lions, leopards, widabeasts, kangaroos ... in extremely "hot" areas like africa, south america, australia...stilll have hair

Thanks for attempting to answer this question.

2007-09-26 03:28:28 · 9 answers · asked by Anonymous in Zoology

If a spaceship can exit the earth and go to the moon and mars, why can't pollution exit our "ozone layer?"

It's like the earth is wearing a big contact aroundi it.

2007-09-26 03:26:03 · 6 answers · asked by Bri 1 in Astronomy & Space

I have been looking for the website that gives all the info to this subject? and also what is this project called?

2007-09-26 03:23:12 · 2 answers · asked by popstar 2 in Zoology

Lithium reacts with oxygen to make lithium oxide oxide. What is the maximum mass of lithium oxide (g) that could be prepared from 5.74 g of Li(s) and 13.73 g of O2(g)?

2007-09-26 03:20:31 · 1 answers · asked by Anonymous in Chemistry

What is the science behind the fishes that lets them withstand such high pressures under water

2007-09-26 03:18:41 · 6 answers · asked by Rahul R 1 in Biology

2007-09-26 03:17:06 · 24 answers · asked by Anonymous in Astronomy & Space

i have a room of the volume of 2156 cubic feet. i need to calculate the amount of air in pounds of mass that is in the room.. how di i do that ??? i also need to find out the amount of water vapor that is in the room if the temp. is 70 deg fer. .. please help !!

2007-09-26 03:15:28 · 5 answers · asked by masrbobo 1 in Engineering

A particle moves in the direction AB with velocity v m/s given by v = 4t - 4, where t is the time in seconds after passing the point B.
(a) If AB = 9m, find the displacement, sm, from A in terms of t.
(b) Explain why initially the particle is moving in the direction BA.
(c) Find the total distance travelled from t=o to t=3.

2007-09-26 03:13:25 · 1 answers · asked by plolol 2 in Mathematics

I ask this because there are some who are under the opinion that EVPs are scientifically credible. There is a host of reasons why they are not, pareidolia and apophenia being chief among them. But I would like to offer the opportunity to "scientific" investigators of the paranormal to try to rescue EVPs from the dustbin of pseudoscience by coming up with an explanation for how ghosts make these sounds.

Please be scientific. That is, your explanation has to be firmly grounded in established science, not conjecture. Here's some things to get you thinking:

If a ghost creates a sound, how does it mechanically create the pressure wave if the ghost doesn't have mass?

If you posit energy of some kind, define it, tell me where it comes from using mathematical equations or appeals to established science.

If a ghost doesn't have vocal cords, how does it make a sound just like a human voice?

Thanks and good luck!

2007-09-26 03:10:44 · 15 answers · asked by John 7 in Paranormal Phenomena

Several of India lsland have been swallowed by rising sea levels and ecologists beleive new york may be next.

2007-09-26 03:10:12 · 9 answers · asked by BRANDON B 2 in Earth Sciences & Geology

2007-09-26 03:07:18 · 1 answers · asked by ladydamarys 1 in Astronomy & Space

I live in Mississippi any place remotely nearby that i could study this? Also i figure getting a degree is normal psychology couldent hurt.

2007-09-26 03:07:15 · 6 answers · asked by SS4 Elby 5 in Parapsychology

.........{ 0, 0 < t < 1
f(t) = {
.........{ 2t - 2, t > 1

Plz ignore the "......."s! Plus : the three " { "s should be just one big " { ".

Question : Find (Laplace transform of) : L{f(t)}

Please help - I have no idea even where to start here!
Thanks.

2007-09-26 03:04:26 · 1 answers · asked by Anonymous in Mathematics

2007-09-26 03:03:17 · 6 answers · asked by Anonymous in Physics

Write the ionic equation for the reaction, if any, between:

a)HNO3 and Na2CO3
b) NH3 and KCl

(please help me.. thank you!)

10 pts for the best answer(as always)

2007-09-26 03:03:16 · 2 answers · asked by carbonara 2 in Chemistry

A car working at a rate 500W has a maximum speed 20 m/s when travelling on the level against resistance proportional to the square if its speed. At what rate would the car have to work to double its maximum speed?

2007-09-26 02:56:24 · 2 answers · asked by Anonymous in Physics