Science & Mathematics - 18 December 2006

Why, in rock cycle depictions, does magma move around? Because of convection right? So, it rises because it is hot (right?) but contracts and becomes denser as a reuslt ofcooling (right?). Then sinks at plate boundaries. why at plate boundaries?
And is this conveciton organized around the globe or is it random around on the inside of the crust. Does convection occur under continental plates and how so?

2006-12-18 11:10:05 · 4 answers · asked by justin_at_shr 3 in Earth Sciences & Geology

there is circle and there is a]50% b]25% c]12 1/2% d] unknown what are the % in degrees and what is the unknown one in degrees please answer right!!!!!!!!!!!!!!!!!!!!!!!!!

2006-12-18 11:09:01 · 4 answers · asked by ? 1 in Mathematics

We are going to be around and there is more coming. Why can't we interact with them and they will eventually form symbiotic relationships like dogs and cats. As a kid, cats would be oblivious to an oncoming car. Todays feral cats notice cars 100%, the surviving cats have adapted.

2006-12-18 11:08:06 · 8 answers · asked by breastfed43 3 in Zoology

2 sides same length

2006-12-18 11:07:59 · 27 answers · asked by jennifer g 1 in Mathematics

Write each quadratic function in vertex form, if not already in it, identify the vertex, axis of symmetry and direction of opening?

y = -x^2 + 4

y = -5x^2 + 9

y = x^2 + 6x + 2

2006-12-18 11:06:41 · 4 answers · asked by adam 1 in Mathematics

I'm just wondering if there's a sure fire way to avoid hell. I mean, what if I die on Mars? What if I'm light years from the earth, will the intese gravity of a black hole be my hell then. But wait, is it possible that the sun has its own hell, perhaps worse than that found within the Earth? Perhaps to avoid hell, we must blast off into the heavens literally just as God commands. Please respond and be serious about this.

2006-12-18 11:06:21 · 9 answers · asked by ? 1 in Astronomy & Space

what was the percent yield of C2H5OH?

C6H12O6 = 2C2H5OH + 2CO2

2006-12-18 11:06:18 · 2 answers · asked by abishop 2 in Chemistry

2006-12-18 11:05:47 · 1 answers · asked by iqbalkhanayesha 2 in Biology

does any bodu famouse have an account on here lol

2006-12-18 11:03:26 · 14 answers · asked by ste_4114 1 in Botany

i need help with my conclusion questions for science. Please Help!!

2006-12-18 11:01:37 · 4 answers · asked by Keisha 2 in Chemistry

if no friction is involved, mechanical energy is never created or destroyed, just transformed from one form to another. with this priniciple in mind, answer the following question: a ball with a mass of 0.15 kilograms is thrown to a height of 3.0 meters. how far is it traveling as it leaves the throwers hand?(assume there is no friction)

2006-12-18 10:59:59 · 5 answers · asked by Purple C 1 in Physics

The Sojourner rover vehicle was used to explore the surface of Mars as part of the pathfinder mission in 1997. Use the data below to answer the question that follow.

Mars Data:
Radius = 0.53 x Earth's radius
Mass = 0.11 x Earth's mass

Soujourner Data:
Mass of Sojourner vehicle = 11.5kg
Wheel diameter = 0.13 m
Stored energy available = 5.4 x 10^5 J
Power required for driving under average conditions = 10W
Land Speed = 6.7 x 10^-3 m/s

a) Determine the acceleration due to gravity at the surface of Mars in terms of g, the acceleration due to gravity at the surface of Earth.

b) Calculate the Sojourner's weight on the surface of Mars.

c) Assume that when leaving the pathfinder spacecraft, Sojourner rolls down a ramp inclined at 20r (? I don't know this symbol, it looks like a big r that also looks like v) the horizontal. The ramp must be lightweight but strong enough to support Sojourner. Calculate the minimum normal force that must be supplied by the ramp.

2006-12-18 10:59:55 · 3 answers · asked by Robert G 1 in Physics

Let's say a doctor examines the DNA of a mother and daughter, but does not know they are mother and daughter. Can he figure out that they are mother and daughter by looking at their DNA? In other words, is a MATERNITY TEST a specific procedure or can maternity be determined BY ACCIDENT just by looking at DNA? For example, a doctor examines blood from two victims of a crime scene. Can he determine that they are mother and daughter through his examination?

2006-12-18 10:58:15 · 5 answers · asked by Anonymous in Medicine

a. how many molecules of asprin, C 9 h 8 0 4 are there in a 100.0 mg tablets of asprin?
b.how do you calculate the percentage composition of (NH4)2C03.

can someone give me the answers or at least give me a step by step of how getting the answers.

2006-12-18 10:57:03 · 5 answers · asked by Arroyo R 1 in Chemistry

How abt in (a, b, c, d, e, f, g, h, 1, 2, 3, 4), how many subsets contain all four numerals?

How many contain exactly two numerals?

How many contain exactly 3 letters and two numerals?

2006-12-18 10:56:59 · 2 answers · asked by AR2706 2 in Mathematics

2006-12-18 10:56:52 · 5 answers · asked by eduardaberry 1 in Biology

what is 10% of 80%

2006-12-18 10:54:59 · 2 answers · asked by Anonymous in Mathematics

how big is it how many resources are used
how long are its years and days
where is it
how did it get its name
what type of planet is it

2006-12-18 10:54:21 · 4 answers · asked by Anonymous in Astronomy & Space

2006-12-18 10:53:33 · 1 answers · asked by dthurst2 2 in Chemistry

I dont get how to do this Please show all your work, right answer gets best answer

2006-12-18 10:53:09 · 7 answers · asked by Philip P 3 in Mathematics

What is the chemical composition / formula of silk?

(What I mean is ... If Water is H2O, then what is silk?)

2006-12-18 10:51:40 · 4 answers · asked by Anonymous in Chemistry

Okay... Here's the question again..

What volume of O2 gas is consumed in the combustion of 75.6L of propane gas, C3H8, if both gases are measured at STP (1atm, 0 degrees celcius)

C3H8(g) + 5 O2(g) ---->> 3 CO2(g) + 4H2O(g)

Thanks!

2006-12-18 10:50:09 · 2 answers · asked by Anonymous in Chemistry

y = (x-2)Squared

y = (x-2)squared - 18

y=-3(x+5)squared


please help me Algebra 2 is kickin my *** this year

2006-12-18 10:48:57 · 2 answers · asked by adam 1 in Mathematics

2006-12-18 10:48:37 · 4 answers · asked by Anonymous in Astronomy & Space

2006-12-18 10:45:47 · 2 answers · asked by RickySingh2006 2 in Chemistry

On one energy level, how many electrions are needed to fill the s and p orbitals together? And also, what is that called??

2006-12-18 10:45:45 · 5 answers · asked by dthurst2 2 in Chemistry

Einstein stated in his theory of relativity that if a person could travel at least 80 percent near the speed of light, that time for that person will pass more slowly relative to time for an earthbound person. So logically, anytime I am in my car moving, time is moving slowly compare to my housebound girlfriend? So in essence will you say I am younger in terms of age relative to my girl friend's age? Will Einstein clock paradox problem apply even though I am not moving 80 percent near the speed of light. What make the speed of light so special?

2006-12-18 10:44:00 · 4 answers · asked by Anonymous in Physics

A 0.70 kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained length triples. What is the mass of the second block?

2006-12-18 10:43:28 · 5 answers · asked by candy 3 in Physics

If the Universe began from one point and is exploding outward, it would seem that there wouldnt be any collisions at all. Yet we have photographic evidence of these occurences. How is this so?

2006-12-18 10:43:25 · 14 answers · asked by Darktania 5 in Astronomy & Space

Indirectly or directly.

2006-12-18 10:42:06 · 12 answers · asked by Anonymous in Earth Sciences & Geology