Science & Mathematics - 15 November 2007

like if humans lived underground for like a few hundred years what would be some of the physical effects or changes over time

2007-11-15 15:11:01 · 3 answers · asked by trustluvlove 1 in Biology

1) Find all pairs of natural numbers that have squares that differ by 75??
2) Same as 1. But differ by 41
3) Show that there can only be one such pair for each prime number?!

2007-11-15 15:10:46 · 7 answers · asked by NO 1 in Mathematics

(4/8) - (5/9) + (6/10) - (7/11) + (8/12) - ....
is absolutely convergent, conditionally convergent or divergent
how do you tell the difference b/t these? can u plz explain them to me ...thnks!

2007-11-15 15:09:37 · 1 answers · asked by gistrm 1 in Mathematics

every site online talking about this is 99% some school thing

i'm good with math and it's probably incredibly simple
but
i don't understand how to turn absorbance vs time data into usable information
every thing i read on it lightly talks about it and then goes straight to the other equations
i've yet to see what exactly they are doing with this

i'm pretty sure i believe it has something to do with the slopes
but i need to actually see it done out in as many steps

i don't know why it's mystifying me so much
i know for nonlinear plots i should find the tangent buti was told just find the slope at a flat point haha
but a 2nd order regression line fits perfect and i wouldn't mind relating that into it
but
first things first
my retardedness at seeing the connection beyond this

2007-11-15 15:08:56 · 1 answers · asked by Anonymous in Chemistry

Okay, everytime people describe aliens...they have 2 eyes, 2 arms, 2 legs...are we so selfabsorbed, that we can assume they have the same physical body as we, humans, have ? And...the UFO's always have an engine, consist of metal and lights...thus..we assume again that they have the same starting technology as we have....so they would have to posess the same (earthly) materials as we do...doesn't this sound unlikely, assuming they come from outer space, millions of lightyears located from the earth ?

2007-11-15 15:08:30 · 16 answers · asked by Felicita 2 in Astronomy & Space

I am designing a simple amplifier, specifically a class AB amp, and want my load resistance to be 8 ohms. I have two small diodes in my circuit, and am contemplating using transistors 2N3904 (npn) and 2N3906 (pnp). Am I on the right track?

2007-11-15 15:07:46 · 5 answers · asked by MeShell 2 in Engineering

....representitive elements

2007-11-15 15:05:58 · 1 answers · asked by tinygirl0207 1 in Chemistry

2007-11-15 15:04:18 · 8 answers · asked by Doing Homework Neep Help! 1 in Astronomy & Space

Now a days electornic medias is too much angry with the NASA about the concealments of the truth and facts about the programes related to the UFO and space programmes. Why NASA does not speaks about the truth in respects of the aliens, moon and other planets. Why NASA is not showing and helping the History and Geog channels to show the truth.

2007-11-15 15:03:56 · 7 answers · asked by ifhusain 4 in Astronomy & Space

4t^2+36+80 divided by16t^2-16t-320

Reduce the rational expression to lowest terms please.

2007-11-15 14:59:00 · 3 answers · asked by Wonderer 1 in Mathematics

The UFO was sited in Richland Center, Wisconsin 53581. It was above the Walmart parking lot at approximatly 19:35. It had a green light on the left, and a red light on the right. It hovered in one spot, for approximatly one minute, and then changed both lights to white, and took off west.

It looked like the following symbol. ├I The green light would be on the bottom on this symbol, and the red light would be on the top.
If you have any information whatsoever, please post an answer. Anything is welcome. I will chose the best answer, based on what way to report this works best.

2007-11-15 14:57:12 · 14 answers · asked by Anonymous in Astronomy & Space

2007-11-15 14:53:36 · 4 answers · asked by wertyadi 1 in Astronomy & Space

Im a B.A. Geology Major, Should I switch to the B.S.? Can I get into grad school with the B.A.? Will I still make decent money with the B.A.?

2007-11-15 14:52:10 · 4 answers · asked by loulamlou 1 in Earth Sciences & Geology

What is the world's most precious metals

2007-11-15 14:51:43 · 8 answers · asked by varun r 1 in Earth Sciences & Geology

2007-11-15 14:49:52 · 1 answers · asked by Anonymous in Geography

The thickness of the plastic in plastic bags is about 0.002 mm. How many wavelengths of blue light is this? (Assume a wavelength of 475 nm for blue light.)
_____________wavelengths

2007-11-15 14:48:43 · 4 answers · asked by Anonymous in Astronomy & Space

The pair of stars in Albireo is 34 arc seconds apart. What size telescope can resolve them? I am thinking it is 34 cm

2007-11-15 14:47:47 · 2 answers · asked by Anonymous in Astronomy & Space

How often do they produce?How many baby mice can one female have at a time? How hard are they to get rid of?Are they really blind?

2007-11-15 14:46:33 · 3 answers · asked by pamkcromwell111 1 in Zoology

2007-11-15 14:44:47 · 9 answers · asked by Johnny K 3 in Earth Sciences & Geology

2007-11-15 14:43:40 · 2 answers · asked by =AA= 1 in Earth Sciences & Geology

I was reading on HowStuffWorks.com that our water crisis might be more serious than we think. Would it be a possibility to us salt water in amenities like toilets and water our lawns. I don't know if that would rust our pipes or kill our lawn but is it?

2007-11-15 14:43:33 · 9 answers · asked by xXxSmartGuyxXx 3 in Other - Alternative

find the dimensions of the trapezoid of maximum area that can be inscribed in a circle of radius R with its base a diameter of the circle.

2007-11-15 14:43:30 · 3 answers · asked by cooltee13 1 in Mathematics

it's easy to measure it if the rectangle only has 2 dimensions but what if it has multidimension, like 4 or even 10 dimensions. please help me, all genious people out there

2007-11-15 14:42:51 · 1 answers · asked by Caecilia C 1 in Mathematics

Sucrase will separate both sucrose (sugar) and sucralose (Splenda). Can it do this because the enzyme isn't 100% specific to sucrose, or is it because it can't tell the difference between sugar and Splenda? Thanks!

2007-11-15 14:41:36 · 1 answers · asked by what? 5 in Biology

I realy do not understand any of them so could you just tell me a simple way to figure out conics problems?

2007-11-15 14:41:04 · 3 answers · asked by Zero Cool 3 in Mathematics

A hydroelectric dam holds back a lake of surface area 2.9×106 m^2 that has vertical sides below the water level. The water level in the lake is a height 150 m above the base of the dam. When the water passes through turbines at the base of the dam, its mechanical energy is converted into electrical energy with 90 % efficiency.

What volume of water must pass through the dam to produce an amount of electrical energy totalling 1000 kilowatt-hours of electrical energy?
What distance does the level of water in the lake fall when this much water passes through the dam?

2007-11-15 14:38:30 · 2 answers · asked by Anonymous in Physics

just a random question ^_^

2007-11-15 14:37:21 · 1 answers · asked by lzanchettin 2 in Earth Sciences & Geology

A couple of problems I couldn't get on my homework. Any help appreciated!!

Write rxn like this: Ox(1) + Red(2) + other -> Red(1) + Ox(2) + other

1. Write net equation for the spontaneous redox reaction and determine the standard cell potential that results when each of the following redox couples are connected in an electrochemical cell.

a. H1+/H2 and Cu2+/Cu E˚ =
b. Cr/Cr3+ and Ag1+/Ag E˚ =

2. Write net equations for the spontaneous redox reactions that occur during the following:

A copper wire is added to nitric acid

2007-11-15 14:37:18 · 1 answers · asked by crazygirl0630 2 in Chemistry

I know N is +5
and O is -2

But why? I mean, there are 3 O's, so that'd be -6 right? And why is N +5?

2007-11-15 14:36:42 · 1 answers · asked by Caramel 2 in Chemistry

2007-11-15 14:31:55 · 4 answers · asked by Song Cry 2 in Chemistry