Science & Mathematics - 17 December 2007

why if it's so cold is there no snow? I think it's good that it is so cold...it kills off nasty bugs and viruses... but the weather forecasters talk like it's a big surprise and there is something wrong with it. But where's the snow?

2007-12-17 18:43:44 · 15 answers · asked by minerva 7 in Weather

2007-12-17 18:41:23 · 5 answers · asked by help! 2 in Weather

What is:

111,111,111 multiplied by 111,111,111 = ?

2007-12-17 18:38:23 · 5 answers · asked by RedMistPete 4 in Mathematics

I am 27 and have a 3 year old. SO far my skin is good and i dont have any wrinkles etc but a friend of my age has started developing fine lines. I understand that some skin types are different as well as aging process is different from individual to individual. But my question is ON AVERAGE... when does the aging processs begins? and what to look for? I take good care of my skin :o)...so hopefully i'd be able to slow it a little. hehe

2007-12-17 18:34:40 · 10 answers · asked by Anonymous in Biology

natural honey from africa

2007-12-17 18:34:19 · 5 answers · asked by Robin M 1 in Geography

Find the sum of an arithmetic series in which a1=12, a4=-6, and n=10.

2007-12-17 18:33:38 · 3 answers · asked by rbrulesamanda 2 in Mathematics

A proton is accelerated from rest through a potential difference of 25700 V

a) whats the kinetic energy of this proton in joules after this acceleration?

b) whats the speed of the proton after this acceleration?
------------
ok once u find the E.P.E , which is E.P.E = V * q
but then what? AND WHY? IF Electrical Potential Energy= Kinetic Energy in this case , PLEASE EXPLAIN WHY.

2007-12-17 18:31:01 · 7 answers · asked by G3P 3 in Physics

I have to take the derivative twice. I got the 1st part which is this:

x/(x^2+1)^1/2

Now I have to take the derivative of that? How? I know the answer but dont know how to get it.

ALSO

The 1st AND 2nd derivative of this:

√r + 3√r

That one reads:

the square root of r plus the CUBE root of r. not the square root

Okay and this one I have no idea how to do, i did chain rule my answer is always wrong!!

y= (x+2)^8 (x+3)^6


thanks

Here is the answer to the 1st one:

1) 1/(x^2+1)^3/2

2007-12-17 18:29:55 · 3 answers · asked by jyj 2 in Mathematics

I have had this beautiful chance in my life in the hill area. How is this possible...I mean they say there is a pot of gold at the end of the rainbow, but walking through one????

2007-12-17 18:24:43 · 5 answers · asked by peep 1 in Weather

What is the purpose for each of the following reagents:
a) dishwashing detergent (detergents act as surfactants)
b) meat tenderizer (it contains a protease that affects chromosome structure)
c) freezing and crushing the strawberries (these steps are required to break a structure found only in plant cells; therefore, not required to extract DNA from animal cells)

Explain the function of DNAses in cells?

2007-12-17 18:22:11 · 2 answers · asked by KN 1 in Biology

1. A figure skater begins spinning counterclockwise at an angular speed of 4.0 "PIE" rad/s. During a 3.0 s interval, she slowly pulls her arms inward and finally spins at 8.0 "PIE" rad/s. What is her average angular acceleration during
this time interval?
2. What angular acceleration is necessary to increase the angular speed of a fan blade from 8.5 rad/s to 15.4 rad/s in 5.2 s?

2007-12-17 18:19:55 · 1 answers · asked by Qasim S 1 in Physics

The number of students infected with the flu on a college campus after t days is modeled by the function P(t)= 200/1 + 39e^-0.3t

When will the number of infected students be100?

A) About 16 days
B) About 12 days
C) About 14 days
D) About 8 days

2007-12-17 18:15:35 · 2 answers · asked by naughtystudent1985 1 in Mathematics

2007-12-17 18:05:10 · 10 answers · asked by Anonymous in Chemistry

I am a second year chemical engineering major, and I find the major is so hard. I studied a lot more than my roommate, but my GPA is barely 3.0. My roommate's major is sociology. He doesn't study much, and his GPA is almost the same with mine.

I just finished Organic Chemistry final today. It was so hard, and I am just hoping to pass the class. =(

Will chemical engineering get easier in the junior and senior years?

I love natural, science and technology, I want to become a chemical engineer, but if it will get harder, I don't think I can take it anymore..

2007-12-17 18:02:48 · 3 answers · asked by Ryan_kidz 2 in Engineering

Have you played or do you know about yetisports.org?

2007-12-17 17:57:59 · 3 answers · asked by Anonymous in Zoology

Hi, I'm trying to find the volume of the solid generated by revolving the area bound between the curves y= x^2, x=0, and y = x+2 (in the first quadrant only) about the line
x= -1.

I have difficulty determining the radius when the axis of rotation is something other than the x- or y-axis - it always flips me out.

Q: What would be the radius for this problem & how did you determine it?

I decided to use the Shell method
(V = 2(pi)rhw) for this problem and I THINK the height is (x+2 - x^2) with bounds from 0 to -1.

Please let me know how radius was determined & if I'm basically on the right track! Thanks!!!! :>)

2007-12-17 17:57:56 · 2 answers · asked by LLH 2 in Mathematics

in optics

2007-12-17 17:52:52 · 5 answers · asked by ana a 1 in Physics

When you say "receding coastline", which one recedes: the water or the land? How about when it's "receding shoreline", the water or the land? Thanks!

2007-12-17 17:52:23 · 2 answers · asked by Anonymous in Geography

using what kind of matrix, how many cell to inject, Thanks so much!

2007-12-17 17:49:05 · 3 answers · asked by postdoc2007 1 in Biology

$1400 at 6% compounded quarterly

A) 9.31 years
B) 11.64 years
C) 23.28 years
D) 17.46 years

2007-12-17 17:47:17 · 5 answers · asked by psychologygal1986 1 in Mathematics

?

2007-12-17 17:42:56 · 4 answers · asked by leanza 1 in Geography

2007-12-17 17:38:59 · 3 answers · asked by mom of 2 3 in Weather

refer to:
http://img444.imageshack.us/my.php?image=20610535jc7.jpg

2007-12-17 17:38:32 · 5 answers · asked by Anonymous in Mathematics

I need help on how to start my science paper.
its on plate tectonics.

its a 10 page report and its due on thursday.
and I need more information.

I also dont know how to start my paper.
I dont know if I should say: Im doing a report on plate tectonics. So I need help on some more ways to start off my report

please help. thanks to anyone who has a good answer

2007-12-17 17:33:52 · 2 answers · asked by Anonymous in Earth Sciences & Geology

How long must $6,000 be in a bank at 7% compounded annually to become $11,802.91?

A) 9 years
B) 12 years
C) 11 years
D) 10 years

2007-12-17 17:28:55 · 5 answers · asked by psychologygal1986 1 in Mathematics

PLEASE HELP ME OUT FOR DERIVATION OF E=MC^2

2007-12-17 17:25:11 · 1 answers · asked by Joshua 2 in Physics

please tell me formula also

2007-12-17 17:15:47 · 12 answers · asked by Palaniappan 1 in Mathematics

And anyone pl give me a explanation (i am a novice)

2007-12-17 17:15:18 · 5 answers · asked by spice 5 in Astronomy & Space

Let f(t) be a continuous function and
f(t) = 0 for almost all t ∈ [0, 1].

Show that f(t) = 0 for all t ∈ [0, 1].

2007-12-17 17:15:12 · 5 answers · asked by N 1 in Mathematics

slowed natural selection with technology by interfering with the gain of that important information in our genome?

for instance; someone with bad eyesight is now as equally likely to pass on those genes because he/she has adapted with glasses

2007-12-17 17:13:09 · 7 answers · asked by Sam 4 in Biology