Science & Mathematics - 3 December 2007

Sulfur dioxide is produced in enormous amounts for sulfuric acid production. It melts at -73°C and boils at -10°C. Its H°fus is 8.619 kJ/mol and its H°vap is 25.73 kJ/mol. The specific heat capacities of the liquid and gas are 0.995 J/g·K and 0.622 J/g·K, respectively. How much heat is required to convert 2.490 kg of solid SO2 at the melting point to a gas at 60°C?

2007-12-03 02:16:59 · 1 answers · asked by jnester0289 1 in Chemistry

And find radius of convergence

2007-12-03 02:12:49 · 1 answers · asked by Anonymous in Mathematics

2007-12-03 02:10:58 · 1 answers · asked by Anonymous in Mathematics

2007-12-03 02:08:15 · 7 answers · asked by Ghost of Rasputin 2 in Astronomy & Space

what's the difference between snow men and snow women

2007-12-03 02:01:51 · 8 answers · asked by ryn 2 in Weather

It seems that all the fossils found were within the boundaries of the U.S. Please clarify.

2007-12-03 01:58:10 · 12 answers · asked by mash 1 in Astronomy & Space

The manager of a large apartment complex knows from experience that 100 units will be occupied if the rent is 420 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 7 dollar increase in rent. Similarly, one additional unit will be occupied for each 7 dollar decrease in rent.

a. Give an expression for the monthly revenue in terms of x, the monthly rent being charged.

b. What rent should the manager charge to maximize revenue?

2007-12-03 01:55:43 · 10 answers · asked by Anonymous in Mathematics

2007-12-03 01:55:33 · 1 answers · asked by Chris L 1 in Engineering

...with a helium core that is not hot enough to start fusion yet was rising in luminosity but falling in temperature, what could be going on with that star??

2007-12-03 01:54:27 · 2 answers · asked by fpa06mr 5 in Astronomy & Space

why do you think this is? is it for the benefit of all mankind or are they building some thing up there that will alllow them to control every one down here on the planet? or are they hoping to find a planet that will support human life, so they can finally escape from us, bearing in mind that only people with more than $10,000,000 dollars will be allowed to live there?
is this what their really up to? because lets face it these people, the haves and the have mores never do any thing for any one but them selves ,unless of course they are absolutely forced too?
you might say im a little sceptical about there motives.

2007-12-03 01:50:08 · 3 answers · asked by anthony p 3 in Astronomy & Space

2007-12-03 01:47:54 · 14 answers · asked by Anonymous in Astronomy & Space

I do. I think it's pretty arrogant to think that we are the only intelligent life form in the universe.

2007-12-03 01:46:06 · 14 answers · asked by Anonymous in Astronomy & Space

i tried google earth and could not get a current picture.

2007-12-03 01:42:40 · 2 answers · asked by star3 1 in Astronomy & Space

2007-12-03 01:41:16 · 11 answers · asked by anu 1 in Earth Sciences & Geology

2007-12-03 01:37:02 · 17 answers · asked by anu 1 in Astronomy & Space

2007-12-03 01:32:03 · 10 answers · asked by Anonymous in Mathematics

Why they count time according to Greenwich local time?
Greenwich is a village in England and it is near to some orbit which passed through this village but I just want to know how and why they count time according to Greenwich local time only?

2007-12-03 01:28:54 · 5 answers · asked by Honey 1 in Geography

Where did it originate? How effective do you consider it to be? Where did you learn about it? Have you used it? Were you there???

2007-12-03 01:28:22 · 8 answers · asked by Free Thinker 6 in Earth Sciences & Geology

a swimming pool can be filled by a pipe in 10 hours if the drain is opened. if the pipe was allowed to run with the drain for 2 hours, and the drain is closed afterwards, it would require the pipe 4 more hours to fill the tank. how long would it take the pipe to make the tank full if the drain is closed from the start?


i need step by step procedure, again..

pls answer....NOW!!!!!
PASS TOMORROW DEC.4 2007...!!!!!!

ARIGATO GUSAYMASU!!!

DOMO ARIGATO!!!

2007-12-03 01:23:16 · 5 answers · asked by Chidori Kaname 2 in Mathematics

What is the definte integral of:

3xdx over the inberval [5,0]

2007-12-03 01:23:12 · 2 answers · asked by Shoe Girl 2 in Mathematics

What metal fabrication is....?

The only definition I can think of would be:

Taking two peices of metal and forming one. Is that correct?

2007-12-03 01:23:04 · 4 answers · asked by Grants a tractor luvr! 6 in Engineering

i was wondering in places where never get cold or winter do the trees has the same pattern ?

2007-12-03 01:22:40 · 10 answers · asked by Bebolini 1 in Botany

"In an engine, a connecting rod 18 cm long is fastened to a crank of radius 6 cm at point P. The crankshaft rotates counterclockwise at a constant rate of 200 revolutions per minute. The horizontal velocity (cm/min) of point P is:
v = -2400πsinθ
where θ is the central angle of the crankshaft. What values of θ produce a maximum horizontal velocity?"

2007-12-03 01:10:32 · 1 answers · asked by slowandsteadydoesntwintherace 1 in Mathematics

In the power transformer we usually use the tap changer in 5 steps (-5, -2.5, 0, +2.5, +5) on primary side at off load.

the question:
1- why it is 5 steps?
2- why it is in the primary side? if it is on secondary side, is true?
3- why it is at off load?

thankyou very much

2007-12-03 01:09:37 · 4 answers · asked by AtheelKK 1 in Engineering

2007-12-03 01:07:21 · 2 answers · asked by jaypee 1 in Earth Sciences & Geology

please answer quickly

2007-12-03 01:05:08 · 1 answers · asked by muhaha 2 in Earth Sciences & Geology

all if our resources and effort into making the moon habitable. Could we do it (ie achieve a self sustaining atmosphere, agriculture ect)

2007-12-03 01:01:00 · 5 answers · asked by pete the pirate 5 in Astronomy & Space

Both the weather radio and Yahoo weather tell me that the approaching snow storm warning will last until 12 PM tomorrow . Is that noon tomorrow or is it midnight between today and tomorrow ? What is wrong with using the apparently old fashion "noon" and "midnight" ? My children tell me that digital watches use 12 AM and 12 PM. (bad design!) I don't have a digital watch.

2007-12-03 00:58:30 · 17 answers · asked by Dorcas 3 in Weather

everytime i hear the talk about aliens there it goes the pleiadans , now you always hear about dna activation , awakening , and enlighting . what do you think about all th sightings and channelings they are doing now? many say they are helping the planet , but i dont see any change

2007-12-03 00:46:50 · 7 answers · asked by Anonymous in Astronomy & Space

This surgery will make my life better but the change in my life is life altering.

2007-12-03 00:44:57 · 3 answers · asked by Anonymous in Medicine