Science & Mathematics - 2 December 2007

If gravity pulls matter so hard that light can't escape, it must be traveling at the speed of light somewhere else because of a difference in pressure, right?

Think of our universe as a balloon that's got a slow leak (black hole). It's known that our universe is expanding, so there must be something that's keeping matter in our balloon and inflating it but at the same time still allowing slow leaks to escape, right?

I think a hot air balloon may explain this. When heat is introduced, the balloon fills up with hot air and it expands, and in order to keep the balloon afloat, constant heat must be added.

Well, Stars are a constant source of heat, and although their heat may struggle to reach out of our solar system, trillions of stars could produce enough heat to make our universe expand and compensate for the leak. So if what-ever is outside of our universe, must be either colder or have less matter(diffusion).
Can someone chime in on this?

2007-12-02 10:24:16 · 7 answers · asked by Patrick 4 in Astronomy & Space

{3y = x - 30
{2x + 6y = 0

a. (15, -5)
b. (-5, 15)
c. infinite number of solutions
d. no solution

2007-12-02 10:24:10 · 3 answers · asked by . 1 in Mathematics

If you have a problem such as 2.56x10^4 x 4.08^2 would the numbers 2.56 and 4.08 be added or multiplied when trying to simplify it?

Then if you had an exponent that was 10^3 x 10^2 would that equal 10^5 or 10^6?

Another is 1.2 x 10^24 divided by 6.0 x 10^20 what would that equal and why?

2007-12-02 10:23:19 · 2 answers · asked by Bri 1 in Mathematics

Being a scientist was the very first thing I ever wanted to be but life took me in a different direction.

I'm 25 years old and about 9 months away from a Bachelors degree in Computer Information Systems from Devry Online.

Right now I'm about to go to Iraq as a civilian truck driver. It pays about $100,000 a year so I figure ill do this for a couple years and save up some money, then come home and finish my education. At that time I'll be 27-28 and it could take anywhere from 2-8 years after that to earn the degree I need to get the job I want.

I kind of like Biology and Genetics. I like the idea of working with DNA to help people. Would I be able to make any difference in the world if I became a scientist? A difference that would make the years of studying worthwhile?

Do you have any general guidance for me? Do you think its too late?

2007-12-02 10:22:21 · 5 answers · asked by xmilestogo 1 in Other - Science

I am just sure I saw a bald eagle picking up a dead armadillo yesterday. It was a huge brown bird with a white tail and white head, yellow beak...looked just like a bald eagle. But I didn't think they ventured this far south, so I thought I would check.

2007-12-02 10:22:10 · 6 answers · asked by Someday Soon 2 in Zoology

An 18 kg box is released on a 37 degree incline and accelerates down the incline at 0.270 m/s^2. Find the friction force impeding its motion. How large is the coefficient of friction?

Please show and explain all work please.

2007-12-02 10:21:18 · 1 answers · asked by Kantilal P 1 in Physics

HOW DOES THE PHYSICS INVOLVES TO THE ROCKING CRITTER/HORSE??
IT'S FOR MY PHYSICS RESEARCH~
AND WHERE CAN I FIND IT??

2007-12-02 10:20:48 · 1 answers · asked by Anonymous in Physics

2007-12-02 10:14:33 · 6 answers · asked by Anonymous in Weather

tell weather its dark, sunny, sunset, rainy, snowy, cloudy, warm, cold, humid. all that :D

2007-12-02 10:13:23 · 16 answers · asked by Anonymous in Weather

Who decided that the U.S and South America is on the Western side and that Europe is on the Eastern side?

2007-12-02 10:09:46 · 4 answers · asked by Leo 3 in Geography

i know that the ph of 6 should grow the best , the ph of 4 is acidic and 8 and 10 are alkaline , but in an experiments , the results for the pH of ten did not come out like how i excepted it. Please explain how the seults should be . like for eample , should the Ph of four or ten grow the worst? Thank you.

2007-12-02 10:09:32 · 1 answers · asked by Help!!! 2 in Earth Sciences & Geology

2007-12-02 10:06:08 · 1 answers · asked by Anonymous in Earth Sciences & Geology

solve -7+x=x/2+18

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

when i kept going outside my head started hurting. Is it because of the snow? I went back in and it stopped, when I went out again it started...again...

2007-12-02 10:05:42 · 1 answers · asked by Anonymous in Weather

solve 4/5x=5

2007-12-02 10:05:39 · 24 answers · asked by Anonymous in Mathematics

solve 8x+2-2x=6x+4-12x+2

2007-12-02 10:05:09 · 2 answers · asked by Anonymous in Mathematics

2007-12-02 10:05:08 · 2 answers · asked by Anonymous in Mathematics

where can i buy a pig from and how much do they cost

2007-12-02 10:04:39 · 33 answers · asked by neil c 2 in Agriculture

2007-12-02 10:04:16 · 5 answers · asked by Anonymous in Mathematics

What was the local moon temperature when astronaut's landed on moon. Local means - the temperature where they stayed until they returned to their space shuttle.

I am asking this question because I know that temperature on Moon goes to extremes; more than 100 degree celsius at noon time, where if we want to boil water we do not need artificial heat and water will boil automatically and also can cook food without fire. In the night temperature goes about minus170 degree celsius.

So what time of the day they were on the Moon? If they lived on moon at a period of the day which was a "tolerable range" say early morning or late evening time, then was there any urgency from their side to take off from moon again before the temperature goes to extremes?

I suppose there was a movie - where the astronauts land on an asteroid on night however they had to leave the asteroid before sun rise because with the sun rise the temperature would rise too much so that they would die immediateltly.

2007-12-02 10:00:53 · 5 answers · asked by SS 2 in Astronomy & Space

Given f(x) = {-x, for x> and /or = 1
{x+k, for x< 1


a). find the value of k so that f(x) will be continuous at x=1
b). Using the value of k found in part A, is f(x) differentiable at x=1


AND!
What is the minimus initial velocity needed so that a ball thrown upwards from the ground reaches the top of a building 40 feet high?


AND!!
A cylindrical Terrarium hanging from the ceiling leaks sand at the rate of 5cm^3/minute. The sand falls to the floor, forming a conical pile. the radius and the height of the cone are in the ratio 3:2. How fast is the height of the pile increasing when the radius is 9cm??


OMG....im SO lost! i dont even know where to start on any of these problems..PLEASE help me!

2007-12-02 09:57:18 · 2 answers · asked by Anonymous in Mathematics

i have this math problem, that i cant seem to figure out, can someone please help me.? the question goes as follows:

Question. A factory is to be built on a lot that measures 80m by 60m. A lawn of uniform width and equal in area to the factory must surround the factory. What demensions must the factory have?

Answer. It should have a uniform width of 10m
Factory is 60m x 40m


How would i figure that out?..any help would be great thanks

2007-12-02 09:56:37 · 2 answers · asked by lovesports 1 in Mathematics

please list all the maths and prerequisite you need to take computer engineering for or as many as you can ?

2007-12-02 09:54:56 · 4 answers · asked by Anonymous in Engineering

plase answr as quickly as possible i need it.
like right now =[

2007-12-02 09:54:45 · 2 answers · asked by fcollazo526 1 in Astronomy & Space

2007-12-02 09:54:08 · 4 answers · asked by tell me all!!! 4 in Weather

I know this is very basic question, but some how I want to understand this mathematics trick.
Let’s say I have $20,000 income this year which is increase of 25% from last year. When I multiply - 20,000 * .25, I get 5,000 but 15,000 (20,000 – 5,000) is not correct answer. Rather 16,000 is correct answer!

How do we calculate reverse percentage?

2007-12-02 09:54:02 · 3 answers · asked by Shiva 1 in Mathematics

I need some help with my calculus homework. I'm trying to figure out the series representation for f(x) = ln(x+4) about c = -2. I know that you have to first take the derivative (1/x+4) so as to make it a rational function but then I don't know how to manipulate it so as to make it geometric form. I also have to specify the domain.

2007-12-02 09:53:15 · 1 answers · asked by Anonymous in Mathematics

I am not sure how to set up or solve this problem!

2007-12-02 09:53:07 · 3 answers · asked by Lorraine 2 in Mathematics

2007-12-02 09:53:03 · 1 answers · asked by Anonymous in Mathematics

2007-12-02 09:51:11 · 3 answers · asked by Anonymous in Mathematics