Science & Mathematics - 3 February 2007

and how long would it take, given that the present population is about 6.0Bn. Is there a formula in demographics to calculate this?

2007-02-03 02:48:02 · 8 answers · asked by mick t 5 in Other - Science

seriuosly

2007-02-03 02:48:01 · 1 answers · asked by lalau 3 in Mathematics

2007-02-03 02:47:42 · 5 answers · asked by MrYuQuan 3 in Chemistry

I like Explosions!!!! But not life threatning explosions.

2007-02-03 02:44:35 · 10 answers · asked by Anonymous in Astronomy & Space

2007-02-03 02:43:34 · 3 answers · asked by avinash-mm2010 m 1 in Earth Sciences & Geology

I want to become I doctor, I want to know all the possible types of doctors there are. (ex. pediatrician, etc.)

2007-02-03 02:42:58 · 9 answers · asked by Kedah<3 3 in Medicine

Does any one know how to do a snow day. Ive heard theres something you can do and it works for having a snow day! is it true. i really dont want school!

2007-02-03 02:42:09 · 8 answers · asked by CUrly girl 2 in Weather

i surely do

2007-02-03 02:41:56 · 16 answers · asked by conundrum 3 in Zoology

What is the way to determine distance compared to time at a given rate of speed?

2007-02-03 02:41:45 · 4 answers · asked by Anonymous in Mathematics

If I make my tea with boiling water it has a totally different smell to that made with about 70C water. How does the temperature of the water used affect the release of the flavour from the tea leaves into the tea drink and ultimately into the air above the tea drink?

2007-02-03 02:41:36 · 3 answers · asked by Jon 2 in Chemistry

Youve got a 5.5M of an unknown solution. You know that it is 0.212g/L. You want to know the percent by mass of Iron. You know that the iron has a concentration of 25 ppm. How do you find the percent by mass of Iron? Thank You!!

2007-02-03 02:41:04 · 2 answers · asked by Anonymous in Chemistry

2007-02-03 02:39:58 · 12 answers · asked by crouchamy1 1 in Weather

2007-02-03 02:39:56 · 2 answers · asked by EDWARD F 1 in Earth Sciences & Geology

In my experiment we used a buffer at pH 8.6. The proteins migrated towards the cathode, as expected, but what is the significance of the buffer used?

2007-02-03 02:39:11 · 1 answers · asked by Saralili R 2 in Chemistry

2007-02-03 02:38:47 · 4 answers · asked by conundrum 3 in Mathematics

if a 20w light bulb was to smash while still screwed in and i was to touch the coil inside the glass while the mains and switch were still on. Would there be 240v flowing through the coil?

2007-02-03 02:37:59 · 7 answers · asked by nasserc267 1 in Physics

The reaction of nitrogen with hydrogen to form ammonia is thermodynamically favorable.
N2(g) + 3H2(g) = 2NH3(g) DeltaHº = -92.2 kJ

The equilibrium constant for this reaction is 6.0 x 105 at 298 K. At what temperature is the equilibrium constant equal 1.0 x 103? (R = 8.31 J/mol·K)

2007-02-03 02:37:02 · 1 answers · asked by Frank 1 in Chemistry

My school science fair is coming up in a couple weeks, and i need to get going on my project.

I think this is my question: How does the concentration of dyes affect their colorfastness?

but i need to know what to do... I think I'm going to dye a fabric with a natural dye (maybe blueberries or something?) and then let it set, wash it a few times, and see how it fades.

I'll do that with different amounts of dye each time, so i can test the concentration and how it affects the fading. but is there any special way that i can measure the degree of fading on the fabric? any other ideas? thanks, your help is much appriciated!

2007-02-03 02:36:14 · 2 answers · asked by coolness 3 in Other - Science

2007-02-03 02:35:25 · 8 answers · asked by Anonymous in Astronomy & Space

2007-02-03 02:34:59 · 20 answers · asked by Mike H 1 in Chemistry

2007-02-03 02:33:49 · 8 answers · asked by kartik 2 in Mathematics

2007-02-03 02:33:40 · 2 answers · asked by LITHIUM _ 女の子 2 in Weather

2007-02-03 02:32:50 · 4 answers · asked by LITHIUM _ 女の子 2 in Weather

Could there be some type of cosmological disaster, that we are still waiting to learn about?

2007-02-03 02:31:53 · 14 answers · asked by Calvin James Hammer 6 in Astronomy & Space

As my gran just went up in a puff of smoke and made a mess of the sofa, so I need the info for insurance purposes!

2007-02-03 02:31:13 · 21 answers · asked by Anonymous in Biology

lim . . . . . . . . . . (1 - 4n)/(1 - 2n) =
n=>oo

_______________________________________________

possible solutions....

a. -2

b. -1

c. 0

d. 1

e. 2

or none of these

2007-02-03 02:31:11 · 4 answers · asked by Olivia 4 in Mathematics

2007-02-03 02:30:48 · 4 answers · asked by CBI 1 in Astronomy & Space

i've been taught that the earth is between the moon and the sun. and the moon does not produce light by itself, but rather, the sun illuminates it.

but if the earth is inbetween, then isn't the sun suppose to cast a on the moon instead of lighting it up?

and let's say if what i thought was wrong, the moon isn't directly opposite and therefore the sun can light up the moon, then isn't it so that there will be a certain part on earth that cannot see the presence of the sun or moon at certain time at all? and if that's so, then which part is it?

2007-02-03 02:29:41 · 8 answers · asked by cheeken lita 2 in Astronomy & Space

2007-02-03 02:29:33 · 6 answers · asked by kartik 2 in Mathematics

The following system is at equilibrium:
NH4Cl(s) = NH3(g) + HCl(g)

Which of the following changes will cause the reaction to move to the right?

2007-02-03 02:28:27 · 3 answers · asked by Frank 1 in Chemistry