Science & Mathematics - 31 October 2007

...if there is no human intervention and the pond is made only from rainwater and is far from rivers etc.

2007-10-31 20:15:55 · 5 answers · asked by . 4 in Zoology

Let
f: A-->B
g: B-->C

Prove: If g o f is onto, then g is onto.

I appreciate any help! Thanks!

2007-10-31 20:09:42 · 1 answers · asked by Anonymous in Mathematics

please tell, i am very .......well just eager to know

2007-10-31 20:06:23 · 8 answers · asked by Anonymous in Astronomy & Space

In Australia im allowed 2 graphic calculators for exams with notes (only because its the hardest maths and physics and chemistry). Does anyone know how to get notes and formulas on a Texas TI-83 or 84? Thanks heaps.

2007-10-31 20:03:14 · 2 answers · asked by Anonymous in Mathematics

held a mirror in front of u, what would you see?

2007-10-31 19:56:07 · 8 answers · asked by Anonymous in Physics

I don't know much about it. Are they a religion-oriented group? I saw a model with the ice wall holding in all the water. I thought it was a joke at first. the idea is interesting, but the only ounce of doubt i have that they are not totally insane is our lack of true understanding of gravity. what do you think about it? any merit to their claims?

2007-10-31 19:49:05 · 11 answers · asked by Good Ol' Gary Shanty 4 in Astronomy & Space

Find the exact value of tan 255°.

a. (3 + sqrt of 3)/(3 - sqrt of 3)
b.(1+ sqrt of 3)/(1 - sqrt of 3)
c. 3.73205
d. (3 - sqrt of 3)/(3 + sqrt of 3)

2007-10-31 19:44:16 · 5 answers · asked by sillyboys_trucksare4girls 2 in Mathematics

4 those of u who don't no what those r, contrails r the long clouds left by aircraft, probably passenger planes. & I remember listening to that radio show by Art Bell L8 @ night discussing contrials. I 4get what it was about, so do u think u could give me a basic rundown on what makes contrails "alarming"? & do u believe such facts or whatever about jet exhaust?

2007-10-31 19:42:56 · 6 answers · asked by The Glorious S.O.B. 7 in Weather

And FREAKINGLY FAST when taking exams or craming for deadlines?

2007-10-31 19:35:55 · 10 answers · asked by ? 5 in Physics

2007-10-31 19:25:54 · 1 answers · asked by Caveman 1 in Astronomy & Space

For the function g in your estimate f(x) is O(g), ues a simple function g of smallest order.

a. (n^3 + (n^2)log n)((log n) + 1) + ((17 log n) + 19)(n^3 + 2)

b. (n^n + n(2^n) + 5^n)(n! + 5^n)

Any help you can give is greatly appreciated, and I'll vote best answer.

2007-10-31 19:25:47 · 2 answers · asked by Jean-Francois 5 in Mathematics

Samples of the ocean floor show that the Earth's magnetic field undergoes periodic reversals, at several thousand year intervals. Since humans have developed technology there have been no such reversals, but some say it could happen again in 10-20 years or so. What will happen to all our computers and electronic devices if the magnetic field is reversed? Is there any reason to think there will be significant changes?

2007-10-31 19:24:55 · 22 answers · asked by surlygurl 6 in Earth Sciences & Geology

What are they made of, how do they work?

2007-10-31 19:13:31 · 1 answers · asked by Anonymous in Biology

Can i say: since any number divided by itself is 1 then zero divided by zero the ans is 1?

2007-10-31 19:10:46 · 29 answers · asked by Omar 1 in Mathematics

What is The oppsite of admonition?

2007-10-31 19:07:26 · 4 answers · asked by Alan H 1 in Geography

Does the distance between maxima increase or decrease or stay the same when the slit separation is increased? when the slit width is increased? what about minima?

2007-10-31 19:01:23 · 1 answers · asked by Anonymous in Physics

Lets say I have a cylinder 3" Dia & 20' long. One is holding water & another one holding (for example) Corn Oil.

Would they both weigh the same or would the oil be heavier?

2007-10-31 19:00:34 · 2 answers · asked by DUMBMAN 2 in Earth Sciences & Geology

Are there any leads? will we see it in our lifetime?

2007-10-31 18:59:00 · 7 answers · asked by Anonymous in Physics

The speed of the generator should be the same when it is idle and when some unit is plugged in. Even then the sound changes deeper.

2007-10-31 18:43:57 · 4 answers · asked by kandan 1 in Engineering

2007-10-31 18:39:07 · 13 answers · asked by e_rack 2 in Physics

I actually think it happens.

I mean, the time goes so quick till the minute we wake up. Time flies when we sleep.

Aren't we actually traveling through time?

2007-10-31 18:36:50 · 12 answers · asked by Anonymous in Astronomy & Space

What family does Sulfur belong to?

2007-10-31 18:35:20 · 7 answers · asked by amor <3 2 in Earth Sciences & Geology

I was a hardcore skeptic until I started watching TV such as Lisa Williams, John Edwards, haven't seen Sylvia yet, umm...rescue mediums, anything on WE TV & sci-fi. So after watching all of these I became a hardcore believer. Is that bad to change my mind bc of what I see on TV?

2007-10-31 18:33:43 · 8 answers · asked by Jon J 1 in Paranormal Phenomena

Who watched it? I still don't know what to believe.

2007-10-31 18:30:22 · 11 answers · asked by Jon J 1 in Paranormal Phenomena

I recently did an experiment for the determination of OCl- in bleach. The acutal value in commerical bleach is 5.25%, but when my group did all of the redox titration calculations, the experiment value turned out to be 4.67%. The experimental error was 9.40%. What do these results mean and how can i talk about them in the discussion part of my lab report?
If anyone can help me, it would be really appreciated. Thanks.

2007-10-31 18:28:50 · 2 answers · asked by Anonymous in Chemistry

draw an isosceles triangle. from the midpt. of each leg, draw a perpendicular segment to the base. prove that these segments are congruent.
how do you do a two column proof?! help quick! thanks.

2007-10-31 18:26:00 · 2 answers · asked by janetツ 3 in Mathematics

54.70 mL of 0.162 M AgNO3
48.30 mL of 0.161 M K2CrO4
Mixing the following solutions resulted in the isolation of 1.37 g of Ag2CrO4

2007-10-31 18:21:40 · 2 answers · asked by Anonymous in Chemistry

2007-10-31 18:17:56 · 13 answers · asked by mel s 2 in Zoology

that is (x+y) to the power of 5

2007-10-31 18:11:07 · 9 answers · asked by Josh M 1 in Mathematics

2007-10-31 18:06:50 · 1 answers · asked by Sean P 1 in Chemistry