Science & Mathematics - 29 December 2007

Əw/Əs, Əw/Ət, where w=x^2-y^2, x=cost, y=sint, s=3, t=Pi/4

thanks

2007-12-29 02:56:59 · 1 answers · asked by eaglesfire5 1 in Mathematics

I mean solar sails would survive a trip of any great distances, sure solar sails are a great way to get children interested in science and space technology but solar sails just aren't viable.

2007-12-29 02:44:02 · 4 answers · asked by Anonymous in Astronomy & Space

2007-12-29 02:41:13 · 7 answers · asked by AtheelKK 1 in Engineering

If that's correct, how comes we can't rearange them?

For example. Africa has got a whole lot of sand that they don't really want. What they really want is water.

If sand and water are both made up of atoms, why can't they rearange the sand atoms into water atoms?

I bet nobody's ever thought of that.
See, I've solved the Earth's problems.

2007-12-29 02:40:33 · 15 answers · asked by Anonymous in Physics

what do you say in English to both top and bottom of this fraction (for example) 3/5 or 1/3 ?

2007-12-29 02:37:36 · 6 answers · asked by Kathie 2 in Mathematics

Identify the simple organic molecule formed in the leaf and the process that produces it.

2007-12-29 02:33:17 · 2 answers · asked by Ria 2 in Biology

a) primary haloalkanes give nucleophilic substitution via SN2 mechanism.
b) Tertiary haloalkanes give nucleophilic substitution via SN1 mechanism.
c) The rate of SN1 reactions depends only on the concentration of the nucleophile.
d) SN1 reaction is not stereospecific and if the starting material is a chiral compound the product is a racemic due to the planarity of th carbocation intermediate.
e) SN1 reactions are stereospecific with inversion of configuration.

2007-12-29 02:30:02 · 3 answers · asked by Anonymous in Chemistry

Thanks for any help on these. Any help is gratefully thanked in advance!

Sigma, infinite, n=1, ((x-2)^n)/(2^n)*(n^2)

Sigma, infinite, n=1, ((x+3)^n)/n!

2007-12-29 02:29:25 · 1 answers · asked by eaglesfire5 1 in Mathematics

If I have a drug sample that contain impurities,what would be a simple laboratory method to determine the solubility of the pure form of the drug ?
I am seeking details of a method that uses solubilty phase diagram.

2007-12-29 02:28:51 · 1 answers · asked by reenigne 1 in Chemistry

The basis of evolution is that the complex, higher lifeforms were derived fr the simpler, lower forms. By what evidence is there for progress from one form to another?

2007-12-29 02:26:42 · 6 answers · asked by dw1vdn 2 in Earth Sciences & Geology

2007-12-29 02:25:36 · 1 answers · asked by Waqas 1 in Astronomy & Space

Please find the slany asymptote, if any, of the graph of the raional function....

f(x) = (x2-2x+6) / (x+6)

2007-12-29 02:24:52 · 2 answers · asked by The Man 3 in Mathematics

2007-12-29 02:21:24 · 2 answers · asked by jumpy789 1 in Earth Sciences & Geology

2007-12-29 02:19:57 · 9 answers · asked by airaaa 1 in Physics

2007-12-29 02:15:31 · 9 answers · asked by Anonymous in Mathematics

When we ignite a candle it produces light. But light is EM wave. Then how electric & magnetic fields are produced on the ignition of candle.

2007-12-29 02:15:28 · 4 answers · asked by Gurjeet Singh 2 in Physics

2007-12-29 02:11:05 · 4 answers · asked by quintince 1 in Earth Sciences & Geology

according to an article in the science daily magazine http://www.sciencedaily.com/releases/2007/12/071221222544.htm
a rise in temp followed by CO2 and methane possibly due to undersea volcanic activity raising ocean temp, which melts the ice and permafrost releasing methane into the atmosphere, so what will happen next

2007-12-29 02:09:11 · 10 answers · asked by willow 6 in Earth Sciences & Geology

the internet defines sugar as carbohydrates that form white crystals, are formed by photosynthesis and are sweet. but i wanna know wht sugar is in terms of hydrocarbons... I mean, not all compunds containing carbon, oxygen and hydrogen are called sugar right(i guess?)? then wat kinds of hydrocarbons are classifed as sugar? in short, how do we distinguish sugar from other hydrocarbons?? thnks!

2007-12-29 02:06:48 · 5 answers · asked by Merry 3 in Chemistry

The cooked temperature of a turkey here is about 74 degrees celsius.

2007-12-29 02:00:34 · 5 answers · asked by akanthasy 1 in Physics

2007-12-29 01:58:55 · 12 answers · asked by Anonymous in Biology

2007-12-29 01:54:55 · 7 answers · asked by Anonymous in Geography

2007-12-29 01:51:50 · 18 answers · asked by Anonymous in Mathematics

How come there is such a big difference between the temperature of the desert during the day and during the night? One of my friends says it has something to do with the clouds, they absorb light and radiation or something, but I didn't really understand her explanation.

Can someone answer, please?

B.

2007-12-29 01:47:59 · 6 answers · asked by Maelys 2 in Weather

a truck of mass 1500kg travels at a steady speed of 72kmh-1. calculate the force exerted by the engine if the power output if 80kw. i not sure how this works...help?

2007-12-29 01:40:34 · 3 answers · asked by jenille a 2 in Physics

Have you ever wished computer to do something for you?
What's the thing you wanna the computer help you in?
Imagine the properties of the perfect computer in your opinion?
Imagine .. Think .. and tell us !!

2007-12-29 01:36:53 · 3 answers · asked by Anonymous in Engineering

Have multiple psychics ever tried channeling their mental/spiritual energy into a single individual or a single object?

2007-12-29 01:33:31 · 9 answers · asked by Arcanum Noctis 5 in Paranormal Phenomena

Bear in mind, you would not know what was on the other side (instant death maybe), or whether you could get back.
Would you step through, or just let it close again, and spend the rest of your life wondering...?

2007-12-29 01:25:37 · 45 answers · asked by Innocuous pen... 4 in Paranormal Phenomena

2007-12-29 01:07:32 · 6 answers · asked by Natasha 2 in Physics

2007-12-29 01:00:19 · 9 answers · asked by AALUNGA >>RETURNS 7 in Astronomy & Space