Science & Mathematics - 6 October 2007

2007-10-06 02:21:22 · 1 answers · asked by Kathy Phan 1 in Chemistry

How do you specify where does the sea ends and the ocean starts?

2007-10-06 02:19:54 · 12 answers · asked by ssarkar1942 1 in Earth Sciences & Geology

Doctors are studying the spread of measles. Using the variable y to represent the proportion of a population affected by measles, and using t to represent time (days) they find the rate of spread of measles through a city can be modeled by the differential equation dy/dt = 0.2(0.6-y).
Suppose initially 10% of a cities population has measles.
(a) Solve this IVP.
(b) How long will it take before half the population are affected by measles?
(c) What is the long term proportion of the population which will be affected by measles?

2007-10-06 02:07:12 · 2 answers · asked by Anonymous in Mathematics

a)
Compounds containing triply bonded silicon, Si≡Si, cannot be made under normal circumstances, but the corresponding carbon compounds (the alkynes) are common. Explain why this is so.

b)
Give an explanation for the fact that SF6 exists and is stable, but OF6 is unknown.

c)
Write a structural formula for two different isomers of [Co(H2O)2(en)2]Cl2. Indicate the oxidation state of the Co in each case.

2007-10-06 01:44:27 · 2 answers · asked by Hammad A 1 in Chemistry

answers
a)P is closed for addition but Q is not closed for addition
b)P as well as Q is closed for addition
c)Q is closed for addition for Q is not closed for addition
d)none

2007-10-06 01:43:01 · 1 answers · asked by Sowmyasri M 1 in Mathematics

ok.

say for example, you had a human population that evolved by divergent evolution to form 2 species.

are BOTH of these new species (that share a common ancestor of the human) DIFFERENT from the human?

or does one "branch off" to form a distinctly different species from the human, and the other group just kind of continues being human...

im a bit confused

thanks :)

2007-10-06 01:38:55 · 6 answers · asked by Anonymous in Biology

2007-10-06 01:28:29 · 17 answers · asked by Anonymous in Astronomy & Space

2007-10-06 01:18:08 · 2 answers · asked by Preethikrish 1 in Chemistry

2007-10-06 01:14:10 · 2 answers · asked by shedz 1 in Geography

Cannot seem to figure out how to do this type of problem. Any help would be appreciated.

Y=(2 + 2/X) ^1/8

2007-10-06 01:14:10 · 4 answers · asked by Anonymous in Mathematics

2007-10-06 01:01:25 · 13 answers · asked by PAUL D 2 in Engineering

2007-10-06 00:55:59 · 6 answers · asked by nosila 1 in Astronomy & Space

2007-10-06 00:52:16 · 2 answers · asked by abhishek m 1 in Astronomy & Space

do ALL those types of plants flower?

Also, does heat travel faster through liquids, gases or solids?

will water evaporate in a refrigerator?

2007-10-06 00:44:27 · 6 answers · asked by Anonymous in Other - Science

I was wondering after watching thunderbirds 2nd episode, they were at 130C or 260C

2007-10-06 00:43:37 · 7 answers · asked by My pic looks good 2 in Biology

Something is causing me to fail. I study, i use to have test anxiety, but know i dont have it. I was in a car accident last year. Im in anatomy class, but when it comes to the antomy part is fine, but the 100 test question, failed. I'm taking think 02 from the health food place, for memory. Before i was in a accident i took this course got a 89 on the first try, memorize everything, know I cant do it.

2007-10-06 00:43:17 · 4 answers · asked by nubian71 2 in Medicine

Is it everest or that one under the sea

2007-10-06 00:43:00 · 10 answers · asked by Edward C 2 in Geography

They could easily wipe out the dog with one swipe of their claws, yet a puny little dog will make them run like they are in great danger.

2007-10-06 00:37:26 · 7 answers · asked by morris 5 in Zoology

2007-10-06 00:32:46 · 18 answers · asked by pugs38 1 in Medicine

2007-10-06 00:31:34 · 2 answers · asked by Eman S 1 in Chemistry

summation n=1-infiniti
{[(-1)^(n-1)][ln(n)]}/n

2007-10-06 00:20:15 · 2 answers · asked by Anonymous in Mathematics

prove that:

[1/(1 - x²)] + [1/(1 - y²)] ≥ 2/(1 - xy)

given that x and y are positive real numbers.

2007-10-06 00:19:00 · 1 answers · asked by Akilesh - Internet Undertaker 7 in Mathematics