Science & Mathematics - 25 January 2007

for example, the north stars, la osa mayor( in spanish) that we see everynight are still existing or they have already dissapear.

2007-01-25 04:29:59 · 26 answers · asked by Jenous 1 in Astronomy & Space

2007-01-25 04:29:58 · 1 answers · asked by zebbie g 2 in Zoology

2007-01-25 04:29:26 · 3 answers · asked by Anonymous in Botany

2007-01-25 04:27:57 · 9 answers · asked by mani 1 in Physics

Steam expands in a cylinder with a sliding piston in a steam engine. The resisting pressure, Pext, is
73684 Pascals, the volume changes from 185.0 L to 50.8 L, and 4200 J of energy is lost to the surroundings as heat. Calculate the change in energy of the steam in Joules.



&nsbsp w = −Pext ΔV

2007-01-25 04:27:35 · 2 answers · asked by katttiscool 1 in Chemistry

wanna know.

2007-01-25 04:27:15 · 11 answers · asked by rahim4khan 2 in Zoology

Can you please tell me a pair of numbers that have a quotient of 100?

2007-01-25 04:26:23 · 8 answers · asked by Funky Little Spacegirl 6 in Mathematics

I mean how are they transmitted ? For sure nobody dug a telephone circuit under the sea bed...

2007-01-25 04:23:41 · 7 answers · asked by londres2424 2 in Engineering

Here in northern Italy it's getting freezing.

2007-01-25 04:22:45 · 23 answers · asked by Brenno 6 in Weather

2007-01-25 04:20:02 · 4 answers · asked by wuzzbert 1 in Astronomy & Space

1. List all three-element subsets of A = {1, 2, 3, 4, 5}

2007-01-25 04:18:53 · 5 answers · asked by Agentj100 4 in Mathematics

Suppose two black holes were on a collision course with each other. As they get closer, their combined gravitational force causes them to accelerate. As they accelerate, due to relativity, their mass increases, as their masses increase, their gravitational force increases (right?) As their gravitational force increases, they accelerate more. So, could they eventually get to the speed of light?

Their mass would then be infinite, so it would take an infinite force to accelerate them, but their mass being infinite, their gravity would also be infinite, causing the force accelerating them to be infinite as well...

2007-01-25 04:17:00 · 6 answers · asked by Anonymous in Physics

I need lots of help in proving this identity.

For a complex number z, prove:

z=tan[(1/ i)(log((1+iz)/(1-iz))^(1/2))]

2007-01-25 04:15:21 · 3 answers · asked by mobaxus 2 in Mathematics

2007-01-25 04:15:18 · 7 answers · asked by Iwantsome 1 in Chemistry

2007-01-25 04:15:18 · 8 answers · asked by sVeen 2 in Physics

2007-01-25 04:15:02 · 2 answers · asked by fhrencizze 1 in Biology

Our sun is millions of miles way,this it what make life for us humans,I myself don't believe we have been visited by ufo,s.But....surely there is life elsewhere,just look at all the other stars,why should we be the only planet to exist,and when you think to travel to infinity, Times that by infinity again and again.
Its massive I cant find words to explain.
what a fantastic thing life is,The stars,the moon,our planets,the human body just existence of all.
truly amazing.

2007-01-25 04:12:37 · 10 answers · asked by Anonymous in Weather

"Rock" as in stones, minerals, etc.

2007-01-25 04:10:39 · 4 answers · asked by ritziguy 1 in Earth Sciences & Geology

2007-01-25 04:09:55 · 4 answers · asked by mark s 1 in Physics

is there a such thing as imploding planets if so what do they look like and how does it happen?

2007-01-25 04:09:19 · 6 answers · asked by tylerwhippie 1 in Earth Sciences & Geology

25 coulombs per second. current * time=charge

2007-01-25 04:09:02 · 2 answers · asked by sharifalkulike_22 1 in Engineering

2007-01-25 04:09:01 · 4 answers · asked by X 3 in Physics

We're doing rounding and estimation to place value, and while my instuctor insists there's a difference, he doesn't explain very well.

2007-01-25 04:08:11 · 14 answers · asked by Anonymous in Mathematics

2007-01-25 04:03:09 · 2 answers · asked by Mr Sen 1 in Botany

2007-01-25 04:02:34 · 5 answers · asked by Anonymous in Biology

2007-01-25 04:02:15 · 12 answers · asked by Catalyst 3 in Astronomy & Space

im guessing its centagrams. how many equals 1 gram?

2007-01-25 04:01:57 · 3 answers · asked by lynsey 2 in Chemistry

2007-01-25 04:01:10 · 2 answers · asked by Gemma Louise L 1 in Botany

2007-01-25 03:59:50 · 1 answers · asked by Gemma Louise L 1 in Botany

i need to know coz i heard some stuff bout it

2007-01-25 03:59:04 · 7 answers · asked by No Name 1 in Geography