Science & Mathematics - 2 December 2007

have scientist explored the entire earth besides the oceans, have they been to the deepest parts of the amazon, himalayas, siberia or jungles in africa.

2007-12-02 08:46:20 · 3 answers · asked by youngandfly 1 in Earth Sciences & Geology

From dy/dx by implicit differentiation and evaluate the derivative at (2, -1).
x2y+y2x=-2

Please help me.

2007-12-02 08:45:33 · 2 answers · asked by Anonymous in Mathematics

An astronaut in full space gear climbs a vertical ladder on the earth. The astronaut then makes the same climb on the moon. In which location does the gravatational potential energy of the astronaut change more? Why?

2007-12-02 08:44:35 · 1 answers · asked by Rosy 2 in Physics

In the ()..this is a fraction
2x-1
____
x+ 2
need help!

2007-12-02 08:41:49 · 8 answers · asked by Dixie 1 in Mathematics

|v| = 16, Θ = 45degrees

2007-12-02 08:41:48 · 3 answers · asked by Anonymous in Engineering

2007-12-02 08:41:09 · 9 answers · asked by Kimberly P 1 in Earth Sciences & Geology

Why does N2 + O2 -> 2NO

The valence for N is 3+ and O is +2 so shouldn't it be

N2O3 ?

2007-12-02 08:39:46 · 1 answers · asked by myname_isalbert 1 in Chemistry

M is the line 2x-3y-12=0 that cuts the x-axis at p and the y axis at q.

1.find the co-ordinates of p and the co-ordinates of q.
2.find the area of the triangular region enclosed by M,the x-axis and the y axis.

ty in advance for your help.

2007-12-02 08:38:58 · 9 answers · asked by Anonymous in Mathematics

If the Doplar shift indicated that the shift was to blue violet on the spectrum would the big bang explain the theory?

2007-12-02 08:38:07 · 8 answers · asked by Anonymous in Physics

Selling 60x - x^2-500 trees a day I need to find maximum revenue.

A.) I need a revenue function where x = price per tree
B.) I need a maximum and minimum price to sell any trees
C.) What price maximizes revenue?

Thanks,

2007-12-02 08:37:28 · 1 answers · asked by John Avry 2 in Mathematics

cos^2-sin^2=2cos^2-1

Thanks for your help!

2007-12-02 08:36:01 · 2 answers · asked by Anonymous in Mathematics

I need to determine whether the matrices are multiplcative inverse. ( * is used to show separation between each number) for some reason it was running all numbers together.


1 * 2 * -1 , 1 * 0 * 2
-1.5 * -3 * 1.75 , 3 * 2 * -1
0 * -1 * 0.5 , 6 * 4 * 0


Find the inverse of each matrix, if it exists.

-2 1 -1
2 0 4
0 2 5

2007-12-02 08:34:37 · 1 answers · asked by brighton 3 in Mathematics

2007-12-02 08:34:06 · 2 answers · asked by Anonymous in Chemistry

The Mechanical force of contraction is generated by:
A) shortening of the thin filaments
B) the "accordian-like" folding of thin and thich filaments
C) a sliding of thin filalments past thick ones
D) shortening of the thick filaments
E) the temporary disapperance of thin filaments

2007-12-02 08:33:59 · 2 answers · asked by lauren u 1 in Earth Sciences & Geology

2007-12-02 08:32:05 · 2 answers · asked by J L 2 in Physics

Heres a few conceptual questions. i would greatly appreciate any knowledge or thinking. you dont have to answer all of them. i know i cant



1) A spaceship that is spherical in shape travels past an observer who is stationary on earth. Assume that the spaceship has a velocity of 0.8c and travels in a straight line. What shape will the observer see as the spaceship travels past? Explain your answer.


2) Consider the spaceship above. What observation will the earth observer make of the density of the spaceship? Explain your answer.


3) Consider the statement matter can be neither created nor destroyed. In view of your knowledge of Special Relativity is this statement correct? If not how would you correct it.


4) Consider the statement: a compressed spring has more mass than the same spring that isn’t compressed. Explain this.

2007-12-02 08:31:35 · 2 answers · asked by Anonymous in Physics

1. An iron ore sample is a mixture of Fe2O3 and several impurities. A 752. g sample of the impure iron ore is heated with excess carbon. Only the Fe2O3 present in the ore reacts with the carbon producing 341. g of carbon monoxide by the following reaction. What is the mass percentage of Fe2O3 in the impure iron ore sample?
Fe2O3 + 3C --------> 2Fe + 3CO

2007-12-02 08:30:52 · 1 answers · asked by Anonymous in Chemistry

2007-12-02 08:29:38 · 3 answers · asked by Anonymous in Physics

??????

2007-12-02 08:27:07 · 12 answers · asked by Anonymous in Astronomy & Space

We are discussing the lewis structure of compounds however, i cannot find any subject on determining when a compound is polar or nonpolar? Does it have to do with its electronegitivity?

2007-12-02 08:27:00 · 1 answers · asked by Anonymous in Chemistry

scientist didnt belive gorilla's were really at first until they saw it for thereselves, even though people that lived in the jungles in africa kept telling them;

so what makes the creatures people say they see today arent really real, if people from all over the world say they see the same thing.

2007-12-02 08:25:20 · 5 answers · asked by youngandfly 1 in Zoology

Is it wrong of me to make an argument stating Perpetual Motion is possible? That some day, we WILL have free energy, by some means that cant be controlled by the time of day, weather, or if the river is flowing (Solar, Wind, and Hydo- power)? Are magnets the answer? Look at Stem Cell research, how long ago did that come about, and every said it wouldn't work, or that THAT was impossible? Look at how far cars have come due to new technology. Look how far computers have come, they have basically taken over our world.

Would it be possible to make a machine, that once you give it a little start, it could produce enough energy to keep itself going, and spare some in the form of say electricity? or make enough power to move a car or truck?

I'm just looking for anything I can use to make my future studies teacher believe my "Future car" could be self powered some how. I have been reading on Perpetual motion for a while now, and believe it will someday be our savior lol

2007-12-02 08:21:55 · 9 answers · asked by louie 2 in Physics

How's the weather where u live??? i just cant wait!! i love the snow!

2007-12-02 08:15:37 · 12 answers · asked by FamGuy123 1 in Weather

2007-12-02 08:15:22 · 10 answers · asked by Anonymous in Biology

1. find (f of g)(x) for the pair of functions: f(x)=x-3; g(x)=√(x+4) , x ≥ -4

a)√(x-3) +4 b)√(x+1) c) √(x+4) d) √(x+4) -3

2. A large totem pole near Kalama, Washington, is 172 feet tall. On a particular day at noon it casts a 165 foot shadow. What is the sun's angle of elevation at that time? Round to the nearest tenth.
a) 46.2° b) 73.6° c) 43.8° d) none of these

3. A statue of a town's founder stands in the town park. Nicholas is 20 meters from the statue. The angle of elevation for Nicholas to see the top of the statue is 30°, and Nicholas' eyes are 1.3 meters above the ground. How tall is the statue? Round to the nearest tenth of a meter.

a) 19.5 m b) 11.5 m c) 20.8 m d) none of these

2007-12-02 08:14:06 · 1 answers · asked by Anonymous in Mathematics

i have a project to do and i can not find any where what the physics is in astrophysics..PLEASE HELP ME!!!!

2007-12-02 08:12:10 · 1 answers · asked by animals1077 3 in Physics

please dont answer with idk or i dont know!!!thanks
but do yu believe in the big bang theary and why/why not!? i dont and most people dont because of religon but do you honistly think that 2 atoms came together and made the earth!!??

2007-12-02 08:11:55 · 12 answers · asked by kitcat13 2 in Astronomy & Space

I want answer on atomic level or even more basic.

2007-12-02 08:10:36 · 5 answers · asked by kerrigan 1 in Physics

Has anybody else notice the weird sweeping tone that clutters the space around 4539 khz? I am able to hear it on my shortwave almost 24/7, and so is my uncle who lives 2 hours away (which eliminates local interference) Is sounds like a transmitter that is rapidly going from a lower frequency sweeping to a higher frequency and then starting over again. at different frequencies the sound is different, sometimes with two tones but all near 4540 khz. this has been going on for at least a year now.

2007-12-02 08:10:03 · 1 answers · asked by Gustard 2 in Other - Science

Two spherical balls are placed so that their centers are 2.6 m apart. The force between the two balls is 2.65 10-12 N. What is the mass of each ball if one ball is twice the mass of the other ball?

_______ kg (lighter ball)
_______ kg (heavier ball)

I also just wanted to say thank you to all the Canadians willing to help, you are so much more helpful then any Americans!!

2007-12-02 08:09:57 · 2 answers · asked by nbgolfer08 1 in Physics