Science & Mathematics - 15 November 2007

2007-11-15 02:42:42 · 15 answers · asked by im2strange 2 in Weather

Of the two, which factor more significantly impacts the inability to see stars clearly in a big city sky:

Is it more:

1) Air Pollution (smog, smoke, dirty air, etc.)
2) The presence of so many lights within the city

2007-11-15 02:42:19 · 13 answers · asked by Dennis O 1 in Astronomy & Space

2007-11-15 02:39:46 · 3 answers · asked by HARRY 2 in Astronomy & Space

Hi,

I am a teacher, but I have slight doubt regarding endosmosis in raisins. I would be thankful if anyone could me the definite formula. The formula I have is W2-W1/W1 x 100, or is it W2-W1/W2 x 100? Is it possible the result be more than 100%?
Thank you.

Philip John

2007-11-15 02:33:11 · 1 answers · asked by lesliejohn 2 in Mathematics

2007-11-15 02:31:46 · 6 answers · asked by Anonymous in Biology

I NEED IT 4 EXTRA POINTS 4 SK00L

2007-11-15 02:31:44 · 3 answers · asked by Anonymous in Other - Science

Previous details given were
sin 3θ = 3sinθ - 4sin^3θ

2007-11-15 02:28:48 · 5 answers · asked by han 2 in Mathematics

The problem is:
Prove that there do not exist any Carmichael numbers with two prime factors.

This is what I have so far:

Suppose there exists a Carmichael number n = p1p2 (where p1 and p2 are odd primes not equal to each other).

Then p1 - 1 divides n - 1.
Also, p2 - 1 divides n - 1.

I'm not sure where to go from here

2007-11-15 02:25:33 · 2 answers · asked by 3545 2 in Mathematics

This Spider is pretty big compared to any other spider that I have seen. It's frt legs has orange stripes through the knee area and the rear have yellow stripes through out them....a somewhat large body. It did have a web close to a wasps nest and was catching them on a regular basis.
Then it disappeared til recently I seen it in my house. I did happen to catch 3 pictures of it while it was on his web. Could someone please tell me if I should be worried about it being I have a 3 yr old son. I can forward pic's if that would help. I have look through-out the web trying to indentify it but I have come up empty on anything that looks like it. I live in southeast michigan close to the woods.
Thank you for any help I can get.
Jim

2007-11-15 02:23:08 · 6 answers · asked by JIM T 1 in Zoology

This is a sample question, but I need to know how to figure it for later questions, can anyone help?

The synthesis of 16.10 grams of sterlingite, an organic compound with a molar mass of 109.42 grams/mole, absorbed 28.46 kJ of heat energy. What is the molar heat of formation for sterlingite (kJ/mol)?

2007-11-15 02:22:07 · 1 answers · asked by Smoke20 1 in Chemistry

What is the coefficient for NO2

2007-11-15 02:20:08 · 1 answers · asked by bubba 1 1 in Chemistry

2007-11-15 02:19:32 · 14 answers · asked by WHITE LOTOUS 2 in Zoology

Need a 5000lb test lifeline. Looking for a chart of cable rating.

2007-11-15 02:15:24 · 6 answers · asked by Randy G 1 in Engineering

http://news.yahoo.com/s/afp/20071114/sc_afp/sciencejapanspaceastronomyphotographyenvironment_071114111331

First high definition images of the Earth rising over the Moon taken from Japanese probe.

2007-11-15 02:14:35 · 3 answers · asked by Anonymous in Astronomy & Space

2007-11-15 02:09:44 · 5 answers · asked by Anonymous in Other - Alternative

My daughter has a baskketball back stop that has a piece of polycarbonate glued to a steel frame. the polycarbonate was broken when the glue holding it to the frane came loose and the wind broke it. I want to replace it with high impact Plexiglass. Will it hold up with a basketball hitting it constantly

2007-11-15 02:09:24 · 2 answers · asked by BigLug597 1 in Engineering

I can't seem to understand this and my calc is computing right.

a.)The max and min values of f(x)=l9-x^2l where -2
b.) Find the Max and min values of f(x)=xsqr(2-x)

c.)Find the x coordinates of points of inflection of f(x)=x+sin x.

Help on any of these problems would me most grateful.

2007-11-15 02:09:17 · 3 answers · asked by MachoMan 4 in Mathematics

why is time going faster? is there another theory beside the "as we get older time appears to go faster"?

2007-11-15 02:04:15 · 4 answers · asked by Honesty 2 in Physics

2007-11-15 02:02:07 · 9 answers · asked by Jon R 1 in Astronomy & Space

I would like to design robots, automated devices, and vehicles. Which engineering is MORE involved in these technologies?

2007-11-15 02:01:28 · 8 answers · asked by winback 1 in Engineering

Please list steps if you can. Thank you.

2007-11-15 02:01:11 · 2 answers · asked by weetereatter 2 in Mathematics

2007-11-15 01:59:32 · 5 answers · asked by cantonlubern 2 in Engineering

2007-11-15 01:57:54 · 1 answers · asked by Anonymous in Medicine

how would you use it for this

lim x-->0 (arctan(5x))/(sin(7x))

2007-11-15 01:56:29 · 3 answers · asked by m_carl 1 in Mathematics

why is time going faster? is there another theory beside the "as we get older time appears to go faster"?

2007-11-15 01:56:10 · 4 answers · asked by Honesty 2 in Astronomy & Space

I've heard that cotton is not good for cold - what works best? Particularly in rain, or freezing fog.

2007-11-15 01:55:10 · 7 answers · asked by Anonymous in Weather

2007-11-15 01:54:20 · 6 answers · asked by OG 1 in Geography

2007-11-15 01:48:25 · 4 answers · asked by Kamila 2 in Astronomy & Space

2007-11-15 01:48:21 · 9 answers · asked by ezmodon 1 in Zoology

2007-11-15 01:46:42 · 8 answers · asked by yAng 1 in Physics