Science & Mathematics - 15 September 2007

When you go to South America you're not upside down it's just like when your home.

2007-09-15 12:30:58 · 7 answers · asked by Dude 4 in Earth Sciences & Geology

The atomic weight of carbon (C) is 12.01 amu. How many carbon atoms are contained in 42.6 g of carbon?

2007-09-15 12:28:40 · 3 answers · asked by Anonymous in Chemistry

G(x) = x^2 - 8x + 10
if
X1=2 & Y1=?

2007-09-15 12:27:39 · 5 answers · asked by Jesnes 1 in Mathematics

Okay...For example, I'm talking to my mom on my cell phone at my house. At the time, my cell phone is using the tower nearest to my house. While I'm talking to her I leave and go 60 miles north east to Austin. How is it that you can keep an un-interrupted conversation eventhough you change so many towers?

2007-09-15 12:26:49 · 2 answers · asked by Dude 4 in Engineering

help me solve thisss. you have to solve by elimination

2007-09-15 12:26:07 · 7 answers · asked by ♥ 1 in Mathematics

WEATHER CLOUDS

2007-09-15 12:24:00 · 4 answers · asked by ANDREA M 1 in Weather

what is the derivative of tanh^2(8x) ?? please be as specific and detailistic as possible with your answer.

2007-09-15 12:23:56 · 1 answers · asked by Anonymous in Mathematics

dealing with the body

2007-09-15 12:23:15 · 2 answers · asked by Emmanuella J 1 in Medicine

and comets, which are on on Kitt Peak??

2007-09-15 12:20:51 · 4 answers · asked by Anonymous in Astronomy & Space

x-{4-{x-(4+x)]}=6


WTF?

2007-09-15 12:16:37 · 4 answers · asked by show and tell 2 in Mathematics

...of the early middle ages?

2007-09-15 12:15:40 · 3 answers · asked by bluebird_chica 2 in Geography

I have a few questions about carbon 14.

1. How does it decay and establish a small constant level in the atmosphere?

2. How does that level establish in plants?

3. How does this level esablish in animals?

4. How is carbon-14 significant in death?

5. How can a geiger counter be used to age an artifact?

If you could answer these it is much appreciated. Thank-you!!!

2007-09-15 12:13:46 · 1 answers · asked by greenpink413 2 in Chemistry

If I bought a dress at a 38% discount and paid $465 for it, what was the original price?

2007-09-15 12:12:21 · 14 answers · asked by beach_babe 1 in Mathematics

2007-09-15 12:11:19 · 4 answers · asked by =) smile24-7 (= 4 in Earth Sciences & Geology

Hi...can u give some softwares or excel that is ready to calculate the antenna height...given the obstructions along the path...thank you....

2007-09-15 12:10:49 · 2 answers · asked by sm012 1 in Engineering

cos, tan, or sin?
while flying a kite, doris let out 400 feet of string. assuming that the string is streched taut and it makes an angle of 48 degrees with the ground, find the nearest foot how high the kite is.

is it sin?

2007-09-15 12:10:06 · 5 answers · asked by Anonymous in Mathematics

Project A
Year 0 = $-100,000
Year 1 = 32,000
Year 2 = 32,000
Year 3 = 32,000
Year 4 = 32,000
Year 5 = 32,000

Project B
Year 0 = $-100,000
Year 1 = 0
Year 2 = 0
Year 3 = 0
Year 4 = 0
Year 5 = 200,000

Required Rate of Return = 11%
What is each Projects...Payback Period, NPV & IRR?

2007-09-15 12:10:02 · 2 answers · asked by BxBmr76 1 in Mathematics

2007-09-15 12:07:38 · 5 answers · asked by Anonymous in Mathematics

Two groups of students order burritos and tacos at a local restaurant. One order of 3 burritoes and 4 tacos costs $11.33. The other order of 9 burritos and 5 tacos costs $23.56.

a. Write a system of equations that describes this situation.
b. Solve by elimination to find the cost of a burrito and the cost of a taco.

2007-09-15 12:07:11 · 4 answers · asked by Anonymous in Mathematics

2007-09-15 12:06:04 · 2 answers · asked by red f 1 in Mathematics

2007-09-15 12:03:55 · 2 answers · asked by Anonymous in Earth Sciences & Geology

The Collatz conjecture is this: Start with any positive integer. If it is even, divide it by 2. If it is odd, multiply it by 3 and add 1. Repeat this process over and over, and eventually you will reach 1. For example, if you start with 3, the sequence goes 3 10 5 16 8 4 2 1, completing the path in seven steps.

This conjecture has never been proven. However, it easily seen that, assuming positive integer n satisfies the conjecture, then 2n also satisfies the conjecture, since the path for 2n must start 2n, n and then follow the same path as n.

How about the following: assuming odd positive integer n satisfies the conjecture, can it be proven that 4n+1 also satisfies the conjecture? Also, is the path longer or shorter, and by how many steps?

2007-09-15 12:02:26 · 7 answers · asked by Anonymous in Mathematics

a. 9
b. 10
c. 12
d. 15

2007-09-15 12:01:57 · 4 answers · asked by Anonymous in Chemistry

2007-09-15 12:01:26 · 1 answers · asked by Gloria S 1 in Chemistry

2007-09-15 11:58:13 · 6 answers · asked by sunchicano 2 in Astronomy & Space

A model rocket is launched straight upward
with an initial speed of 47.8 m/s. It acceler-
ates with a constant upward acceleration of
2.19 m/s2 until its engines stop at an altitude
of 180 m.
a) What is the maximum height reached by
the rocket? Answer in units of m.
b) When does the rocket reach maximum
height? Answer in units of s.
c) How long is the rocket in the air? Answer
in units of s.

2007-09-15 11:53:51 · 1 answers · asked by Anonymous in Physics

I need to solve for x

5/2x - 6/5 = 3/5x + 6

I think the answer is 72/19, but I am not sure as it's been many years since I've did this type of math.

2007-09-15 11:53:49 · 8 answers · asked by beach_babe 1 in Mathematics

Some cell phone towers alongside I-78 in NJ now have "windmills" on top. The diameter of the turbine is around 6 feet. They look much like the farm windmill generators in the 30-ties. With many blades. Not just the three as on modern day large scale wind turbines.

Questions:

1. Did I assume correctly, those are electrical generators? (Or are they possibly just "wind speed" and "weather conditions" measurement devices, operated by a company other than the cell phone operators?)

2. Why so many blades? I thought that was the issue with the old farm windmill generators, they were not as efficient.

3. Why windpower? I thought solar panels are the "in-thing". (Are solar panels in fact too expensive to install and service? Do they need bigger back-up batteries, since they do not work at night?)

http://www.energyadvocate.com/fw90.htm

2007-09-15 11:52:42 · 5 answers · asked by Heinz H 5 in Engineering

Please give me as much on how you got your answer as possible.

2007-09-15 11:47:16 · 3 answers · asked by Elvis P 1 in Chemistry

It's my first time substituting in a middle school and I'm not very clear on what irrational and rational numbers are. And what is a rational number in equivalent form? Could somebody please explain this clearly, I don't want to disappointed the students.

2007-09-15 11:45:20 · 5 answers · asked by John 4 in Mathematics