Science & Mathematics - 18 January 2007

why do impurities lower freezing point but increase boiling point?

2007-01-18 21:05:03 · 2 answers · asked by anthony 1 in Chemistry

Two similar cones have heights of 9cm and 4cm. Find the ratio of their volumes.

2007-01-18 21:04:12 · 3 answers · asked by Anonymous in Mathematics

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after four hours.

2007-01-18 20:53:24 · 3 answers · asked by Anonymous in Mathematics

Dangerous fishes, also different sharks. and some insects and spiders if you know! thanx!!

P.S: mostly those who are 'really' dangerous, like piranhas and white sharks and ... like that.

2007-01-18 20:52:24 · 10 answers · asked by Dirty 5 in Zoology

give sources please

2007-01-18 20:50:50 · 1 answers · asked by the questioner 2 in Chemistry

I know the indenfy of the Octet rule,but stiil don't when is called obey the Octet rule,and when is not?


Thank you

2007-01-18 20:47:45 · 2 answers · asked by shuyi 1 in Chemistry

2007-01-18 20:43:41 · 6 answers · asked by mmedicer 1 in Astronomy & Space

2007-01-18 20:42:43 · 6 answers · asked by Anonymous in Zoology

out of u.s.a. or Mexico?

2007-01-18 20:28:16 · 24 answers · asked by Anonymous in Earth Sciences & Geology

2007-01-18 20:25:52 · 13 answers · asked by Yohannes L 2 in Mathematics

How do you solve the integration of sin(x)*tan^2(x)? Anyone give me some ideas? Thanks a lot

2007-01-18 20:20:49 · 6 answers · asked by sky_blue 1 in Mathematics

do they go around both suns or a figure of 8 or around each sun with daylight on both sides of the planet at one mad seasonal time of the year,

2007-01-18 20:19:17 · 6 answers · asked by ben s 2 in Astronomy & Space

A magic trick, device or gadget that can demonstrate a physics principle in a fun way.

2007-01-18 20:19:06 · 4 answers · asked by Timothy 2 in Physics

i am just curious...........

2007-01-18 20:15:57 · 10 answers · asked by deadman12319 1 in Astronomy & Space

2007-01-18 20:09:56 · 7 answers · asked by Anonymous in Biology

How do I solve these?

Which paint roller can you spread more paint on the wall in one revolution? A cylinder with a 2 inch diameter and 11 inch height or a cylinder with a 3 inch diameter and 7 inch height? What are the volumes and surface areas for both rollers?

2007-01-18 20:09:38 · 4 answers · asked by Emily A 1 in Mathematics

How do you solve this differential equation? Pls help me. Thanks a lot

2007-01-18 20:02:51 · 3 answers · asked by sky_blue 1 in Mathematics

The answers to the left are what I think is correct

1. Write in decimal form 94 17/1,000 - 94.17000

6
2. Multiply. - 0.092 x 10 - 0.552 note the 6 is over the 10

3. Find two factors of 120 with a difference of 2. - 10

4. Determine whether the pair of fractions is proportional:
2/5 - 6/15 - I think so just not sure

5.Find the reciprocal of (- 1/5) (15)

2007-01-18 20:00:34 · 4 answers · asked by single2mingle22000 2 in Mathematics

2007-01-18 19:59:11 · 15 answers · asked by Anonymous in Astronomy & Space

I have a h.w from my biology class and the instruction is to write an analogy to show the similarity between the animal cell part and the everyday object.

For example: The nucleus is like a brain because it controls and coordinates activities of the body.

can anyone help me with these pleaseT_T?
* mitochondrion
* cytoskeleton
* cilia
* flagellum
* nucleolus

2007-01-18 19:59:06 · 2 answers · asked by p r i n c e s s 1 in Biology

(y^2 - x^2)y' + 2xy = 0

Can anyone pls help me solve with this differential equation? Thanks a lot

2007-01-18 19:58:09 · 1 answers · asked by sky_blue 1 in Mathematics

2007-01-18 19:56:35 · 21 answers · asked by Anonymous in Astronomy & Space

2007-01-18 19:54:40 · 6 answers · asked by Anonymous in Earth Sciences & Geology

The exact process is required.
This has nothing to do with studies
PLease give the answer as soon as possible.

2007-01-18 19:53:04 · 1 answers · asked by Dudi 2 in Biology

Everything that exsists has a form of attracktion. The bigger, the more? Or do other factors play a role?
If I'd construct something huge and complex in space, would I stick to it?
And if, what's the minimum sice to keep a person's feet on the ground?

2007-01-18 19:52:43 · 8 answers · asked by Anonymous in Earth Sciences & Geology

Can anyone help me? Explain how to solve...

Two similar solids have volumes or 27 centimeters cubed and 8 centimeters cubed. Find the ratio of their surface areas.

2007-01-18 19:52:02 · 4 answers · asked by Emily A 1 in Mathematics

I live at Altoona PA and i want to move out of this state after the last year of my college. Why I want to move is because the weather sucks here and the hospital we have down here doesn't have a nicu here and thats what I'm studing at college.I got a few questions my first is the weather here isn't bad, we don't have turndoas or hurricans but the winter is cold and i HATE the cold so i was just wondering where i could move to that has nice summer weather but that DOESN"T have turndoas or hurricans or any bad weather. I want to move somewhere that has like warm weather all year round but does not have have anything bad like the hurricans where is that at? And my other question is that state that your giving me have a big hospital with a nicu in it. PLEASE help i know this is a stupid question but i'm bored and i want to know. lol thanks...

2007-01-18 19:49:44 · 8 answers · asked by Anonymous in Weather

2007-01-18 19:45:02 · 16 answers · asked by Mandar 2 in Physics

Television Advertising

As sales manager for Monevideo Production, Inc, You are planning to review the price you charge clients fot TV advertisement development.You currently change each client an hourly development fee of $2500. With this pricing strcuture, the demand, measured by the number of contracts Montevideo sings per month, is 15 contracts. This is down 5 contracts from the figure last year, when your company charged only $2000.

a. Construct a linear demand equation giving the number of contracts q asa function of the hourly fee p Montevideo charges for development.

b. On average, Montevideo bills for 50 hours of production time on each contract. Give a formula for the total revenue obtained by charging $p pre hour.

c. the costs to Montevideo Productions are estimated as follows:


Fixed costs: $120,000 per month
Variable costs: $80,000 per contract

Express Montevidso Productions'monthly cost (i) as a functionof the number q of contractss and (ii) as a function of the hourly production charge p.

d. Express Monteviedo Productions' monthly profit as a function of the hourly development fee p and find the price it should charge to miximize the profit.

2007-01-18 19:43:19 · 1 answers · asked by Anonymous in Other - Science

The surface area of a right cylinder is 576(Pi) cm^2. If the radius and height are equal, find the length of the diameter.

2007-01-18 19:42:38 · 5 answers · asked by Em 2 in Mathematics