Science & Mathematics - 20 September 2007

Names of metals & minerals in soil.

2007-09-20 23:57:14 · 1 answers · asked by Anonymous in Earth Sciences & Geology

http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-001486.html
http://dayton.hq.nasa.gov/IMAGES/MEDIUM/GPN-2000-001486.jpg

As you can see in this page on nasa website, this is a photograph of surface of moon. Nasa calls this photograph "A Rille Runs Through It".
What is "Rille"?

2007-09-20 23:51:58 · 6 answers · asked by Masoud R 1 in Astronomy & Space

The same question for a spaceship ...

2007-09-20 23:45:07 · 4 answers · asked by Anonymous in Astronomy & Space

2007-09-20 23:28:20 · 11 answers · asked by Satish G 1 in Mathematics

I cannot do it and all those I know believe it cannot be done in terms of known functions. Can you prove us wrong?

2007-09-20 23:25:09 · 6 answers · asked by Anonymous in Mathematics

My pet bird might have zinc poisoning (results coming back next week) and until then I want to remove any toys which have zinc in them (some have metal clips for instance). I know some are stainless steel because they're not magnetic, but how do I distinguish between zinc and other metals, without actually destroying the toy? I don't want to have to remove all of his toys because he's so attached to them.

2007-09-20 23:16:23 · 5 answers · asked by Anonymous in Chemistry

find parametric equations for the lines of intersection of the planes: -3x + 2y + z = -5 and 7x + 3y - 2z = -2

2007-09-20 23:07:54 · 2 answers · asked by Anonymous in Mathematics

2007-09-20 23:06:43 · 5 answers · asked by Anonymous in Astronomy & Space

possibly made up by this in the core of its center?

2007-09-20 23:04:30 · 5 answers · asked by Anonymous in Astronomy & Space

i feel really sorry for them, they always seem to be used for working purposes only? do ya think that anywhere in this world compassion is shown to them?

2007-09-20 22:57:59 · 16 answers · asked by Anonymous in Zoology

As you know, there are several aircraft flying in air and when a space vehicle launches to space may impact to one of this aircraft or even another soace object in earth orbital. Now I want to know that how can prevent the accident.

2007-09-20 22:29:05 · 3 answers · asked by Masoud T 1 in Astronomy & Space

A curve is defined by parametric equations x=t^2 and y=t^3. A line intersects the curve at t=(-2) and t=3. Find the area enclosed by the line and the curve.

My book says the area is 110. I can get this by integrating the parameters and using t=(-2) and t=3 as the limits. However I could not see why this worked so I found the equation of the line and the curve and then integrated: (the line minus the curve)dy. Using y=(-8) and y=27 as the limits. This time I got 62.5 as the answer.

I can not see why my technique isn't working. It is just a basic integration.

2007-09-20 22:26:25 · 1 answers · asked by eazylee369 4 in Mathematics

2007-09-20 21:39:29 · 8 answers · asked by momo 1 in Mathematics

a radiator with a 6 gallon capacity is filled with 50% antifreeze solution. how much must be drained so that adding pure antifreeze gives a 60% antifreeze solution?

2007-09-20 21:13:18 · 4 answers · asked by carlos t 1 in Mathematics

2007-09-20 21:08:26 · 6 answers · asked by paulo l 1 in Physics

A bullet is fired through a board 11.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. The initial speed of the bullet is 350 m/s and it emerges from the other side of the board with a speed of 250 m/s.
(a) Find the acceleration of the bullet as it passes through the board.
_____m/s2
(b) Find the total time the bullet is in contact with the board.
_____s

2007-09-20 20:52:43 · 4 answers · asked by lttlstar7 1 in Physics

2007-09-20 20:41:31 · 3 answers · asked by deepak_8584 1 in Engineering

A circular curve of highway is designed for traffic moving at 60 km/hr on a stormy day.What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?

2007-09-20 20:05:17 · 4 answers · asked by Anonymous in Physics

2007-09-20 19:49:04 · 5 answers · asked by Anonymous in Biology

1.) show that if G, G', and G'' are groups and if Ø: G -> G' and ¥: G' -> G'' are homomorphisms, then the composite map ¥Ø:G-> G'' is a homomorphism.

2.) Let Ø:G-> H be a group homomorphism. show that Ø[G] is abelian if and only if for all x, y element of G, we have xyx^-1y^-1 element of Ker(Ø).

3.) Let G be any group and let a be any element of G.
Let Ø: Z-> G be defined by Ø(n)= a^n. show that Ø is a homomorphism. Describe the image and the possibilities for the kernel of Ø.

4.) let Ø: G-> G' be a homomorphism with kernel H and let a element of G. Prove the set equality {x є G l Ø(x) = Ø(a) } = Ha.

2007-09-20 19:46:47 · 2 answers · asked by Anonymous in Mathematics

2007-09-20 19:38:29 · 6 answers · asked by Chuck S 1 in Engineering

2007-09-20 19:34:52 · 9 answers · asked by jatin b 1 in Mathematics

hmmm. about 1 in a million or more, chance of being with that medical case.

2007-09-20 19:34:06 · 5 answers · asked by Question&AnswerPortion 1 in Medicine

2007-09-20 19:29:07 · 1 answers · asked by AnonymousOne 2 in Mathematics

A bullet is fired through a board 12.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. The initial speed of the bullet is 450 m/s and it emerges from the other side of the board with a speed of 350 m/s.

1. Find the acceleration of the bullet as it passes through the board in ( m/s2 )

Find the total time the bullet is in contact with the board in (s ).

2007-09-20 19:28:45 · 2 answers · asked by smilenhope 1 in Physics

Acetaldehyde contains C, H and O in the mass ratio of 6:1:4. Its mass spectrum shows its molecular mass to be 44 amu. what is the molecular formula?

2007-09-20 19:24:45 · 3 answers · asked by Anonymous in Chemistry

1.show that the equation

sin (x - 60' ) - cos ( 30' - x ) = 1


can be written in the form cos x = k, where k is a constant

2.Prove that sin^2 @ ( cot^2 @ - tan^2 @ ) = 4 cos 2@

@ represents pheta

^ represents to the power of.

2007-09-20 19:22:00 · 5 answers · asked by Mystic healer 4 in Mathematics

2007-09-20 19:15:32 · 9 answers · asked by Andrew S 1 in Geography

(1/10)^ 15 * (1/1000)^ -6=
/ - fraction line
*-multiplicated
^ -raised to the power ...

2007-09-20 19:15:01 · 6 answers · asked by dragoi_stefan06 2 in Mathematics

Don't give me ones that it looks "kind of like" I want to know exactly what this spider is and if it is harmful at all. Seen in Oregon on the coast. Go to http://greennature.com/gallery/spider-pictures/callobius_spider.html for a picture. Mine looked EXACTLY like this. But when I looked up the species this guy lists, they look nothing like it.... Hmm.

2007-09-20 19:12:12 · 6 answers · asked by Anonymous in Zoology