Science & Mathematics - 12 January 2007

the question is of partial fractions

2007-01-12 01:05:21 · 2 answers · asked by Kushal V 1 in Mathematics

a certain form letter is to be sent to prospective customers. If 4 model-X computers working independently can do a combined total of 4 of the letters in 4 minutes, then 100 model-X computers working indenpendly can do a combined total of 100 of the letters in exactly how many minutes?
A. 4 min
B. 10 min
C. 25 min
D. 40 min
E.100min

which one is correct, please tell me the method also. how do I set this proportion?

2007-01-12 01:02:21 · 7 answers · asked by liangjizong22 1 in Mathematics

2007-01-12 00:55:54 · 14 answers · asked by jean philippe j 1 in Biology

i need help with genetically modified organisms. i have an exam today. so any one please tell me how do i explain genetically modified organisms in my own words

2007-01-12 00:55:29 · 2 answers · asked by prish_thakur 1 in Biology

2007-01-12 00:55:27 · 7 answers · asked by ummbinyamin15 1 in Earth Sciences & Geology

I was travelling in a taxi that was travelling at 70 mph however there were mosquitos inside the car flying around the car as if it were stationary. How is it that these mosquitos who were not connected to the car in anyway could fly at over 70 mph even when the car changes speed at stoplights etc. Please give me the facts behind the explanantion.

2007-01-12 00:52:14 · 6 answers · asked by B.R.E 2 in Physics

2007-01-12 00:46:30 · 4 answers · asked by Anonymous in Geography

If you put hot water in a vacuum / thermos bottle, it will stay hot due to the vacuum insulating it from the outside air.
There is a 93 million mile vacuum between us and the sun, yet when I go outside, it feels hot.
Why?

2007-01-12 00:41:34 · 4 answers · asked by netspectre101 1 in Astronomy & Space

2007-01-12 00:40:48 · 9 answers · asked by Anonymous in Mathematics

2007-01-12 00:39:22 · 14 answers · asked by Anonymous in Mathematics

2007-01-12 00:36:00 · 11 answers · asked by fab 1 in Earth Sciences & Geology

2007-01-12 00:30:51 · 4 answers · asked by bni0313 1 in Mathematics

2007-01-12 00:26:40 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-01-12 00:26:40 · 3 answers · asked by anjith g 1 in Mathematics

can anyone plz suggest a strategy or a program to follow in order to master the field of electronics .... near home is the Bibliotheca Alexandrina.... full of hundreds of books on the issue... that's why i'm posing the question,,,, cuz i'm puzzled between these books.... they are starting from ac/dc basics and ending with laser and wireless communication.... I only need the advise of an expert or any one who can advise..... thanks in advance..muhammad

2007-01-12 00:22:55 · 1 answers · asked by Anonymous in Engineering

i have hear the shap of the world is really egg shape is this correct

2007-01-12 00:22:13 · 9 answers · asked by london2007 2 in Earth Sciences & Geology

2007-01-12 00:21:23 · 5 answers · asked by Alex C 2 in Weather

We are studying them in class. If u have any info on it can u plz share. If u got smthn mean to say then dnt sai it.

2007-01-12 00:19:38 · 2 answers · asked by =) 3 in Biology

Three volatile compounds X, Y, and Z each contain element Q. The percent by weight of element Q in each compound was determined. Some of the data obtained are given below.

Compound---Percent by Weight of Element Q---Molecular Weight
X ----------- 64.8% ---------------------- ?
Y ------------ 73.0% ----------------------- 104.
Z --------------- 59.3% ---------------------- 64.0

(a) The vapor density of compound X at 27 degrees Celsius and 750. mm Hg was determined to be 3.53 grams per liter. Calculate the molecular weight of compound X.

(b) Determine the mass of element Q contained in 1.00 mole of each of the three compounds.

(c) Calculate the most probable value of the atomic weight of element Q.

2007-01-12 00:16:01 · 1 answers · asked by bosox1989 1 in Chemistry

2007-01-12 00:15:56 · 2 answers · asked by Anonymous in Biology

I heard that after 10 years our whole body is different as existing cells, particularly the skin layers die off and are replaced by new ones. I'm curious to know why the ink does'nt get expelled along with it! Anyone know why/how ?

2007-01-12 00:13:24 · 7 answers · asked by Ad Cas 2 in Biology

Use principles of atomic structure and/or chemical bonding to answer each of the following.

(a) The radius of the Ca atom is 0.197 nanometer; the radius of the Ca2+ ion is 0.099 nanometer. Account for this difference.

(b) The lattice energy of CaO(s) is -3,460 kilojoules per mole; the lattice energy for K2O(s) is -2,240 kilojoules per mole. Account for this difference.


Ionization Energy (kJ/mol)
First Second
K 419 3,050
Ca 590 1,140



(c) Explain the difference between Ca and K in regard to

a. their first ionization energies,

b. their second ionization energies.

(d) The first ionization energy of Mg is 738 kilojoules per mole and that of Al is 578 kilojoules per mole. Account for this difference.

2007-01-12 00:12:50 · 3 answers · asked by bosox1989 1 in Chemistry

i need to know for a project.

2007-01-12 00:11:27 · 3 answers · asked by runninrims24 1 in Engineering

2007-01-12 00:06:55 · 7 answers · asked by hyaline h 1 in Geography

do we see things in life liek objects upide down and our eyes turn then the right way

2007-01-12 00:03:49 · 13 answers · asked by amy c 1 in Biology

what conditions are neccesary for substances to be separated by chromatography?
why might different solvents be used in chromatography?

2007-01-12 00:01:02 · 5 answers · asked by okiron 1 in Chemistry

2007-01-12 00:00:59 · 2 answers · asked by Eric Inri 6 in Engineering