Science & Mathematics - 29 December 2007

Darkness isn't the opposite of light, its the absence of light...what is the opposite of light?

2007-12-29 08:00:47 · 12 answers · asked by Cactus Jack 4 in Astronomy & Space

like an organism needs cells, or they have to breath, or anything else you know about...

2007-12-29 07:55:07 · 8 answers · asked by Anonymous in Biology

2007-12-29 07:54:24 · 11 answers · asked by ppd232 1 in Mathematics

2007-12-29 07:47:25 · 18 answers · asked by Nancy D 2 in Astronomy & Space

I am a 14 year old student working on a sciencefair project. I im 9th Grade Biology Honors. Our idea is to construct 3 different kinds of vegated roofs. We need to know what materials we should use and other details. Keep in mind, we are doing a science fair project. We need a small scale. We're not talking about an actual roof like on top of your house. We want to make a downsized roof model.

Thanks!

2007-12-29 07:42:55 · 1 answers · asked by candy k 1 in Other - Science

Incandescent floods produce about produce about 750 lumens. Please be specific about brand and web site.

2007-12-29 07:42:32 · 3 answers · asked by Janet H 2 in Physics

Has anyone done telekinesis here? How do you do telekinesis?

2007-12-29 07:41:19 · 12 answers · asked by Anonymous in Parapsychology

2007-12-29 07:39:36 · 9 answers · asked by christina 4 in Mathematics

2007-12-29 07:36:20 · 7 answers · asked by ppd232 1 in Mathematics

a^n + b^n = c^n , n>2

Why can't I just get a computer:

graph [x^3+y^3]^(1/3) = z(x,y)
Then graph [x^4+y^4]^(1/4) =z(x,y)
etc...study how each curve changes as n increases

Generalize for all n...then graph x^y= p(x,y) ...and see geometrically that p never intersects z(x,y) for any integer ...

2007-12-29 07:33:24 · 5 answers · asked by Anonymous in Mathematics

Do you think 2000IUs a day is too much for bone density, absorption of calcium and high doses it converts to a natural prohormone ???

2007-12-29 07:31:43 · 5 answers · asked by Anonymous in Medicine

Write the given equation in the form (x-h)^2+(y-k)^2=r^2, give the center and radius of the circle by the equation.
x^2+y^2+4x-12y-9=0

2007-12-29 07:29:27 · 6 answers · asked by :D...hello 1 in Mathematics

Al(NO3)3 + NaOH (arrow thing or = sign) NaNO3 + Al(OH)3

2007-12-29 07:20:24 · 4 answers · asked by Kevinak 3 in Chemistry

2007-12-29 07:20:22 · 8 answers · asked by Anonymous in Mathematics

... or would it need air (instead of being in a vacuum)?

2007-12-29 07:19:51 · 7 answers · asked by Kelly 7 in Astronomy & Space

I have to find out what items can be used as conductors for bulbs. I will have to find out which items allow it to go through and how effectively will it go through? Why do some make it brighter? How come this one doesn’t light up?

I am testing items like nails,rubber bands,foil,copper,etc.

Please help me decide what types of items work the best

2007-12-29 07:18:12 · 8 answers · asked by MentoKings10 2 in Engineering

?????

Who is the worst mathematician in the world (Someone who has a Ph.D in math only!) and why?

2007-12-29 07:18:12 · 6 answers · asked by Anonymous in Mathematics

explain why a melted ionic compound is a good conductor of electric current, but a solid ionic compound is a poor conductor of electric current
dont write an essay, i just need 1 or 2 sentences

2007-12-29 07:14:07 · 3 answers · asked by Anonymous in Chemistry

i need a metric container that measures the SI unit for volume (cubic meter)

2007-12-29 07:13:14 · 2 answers · asked by Lorr C 1 in Chemistry

i dont know what the formula is to do fibonaaci sequences so if you could explain that to me i would appreciate it

2007-12-29 07:11:21 · 5 answers · asked by Anonymous in Mathematics

2007-12-29 07:08:30 · 3 answers · asked by Bubba 2 in Weather

I have a question about black holes and i think it makes since but don't know how to ask about it without my theory getting stolen. The way I figure it if I can ask someone about it if they couldn't disprove my theory that would be cool but if they could then I'd have an answer to my question so its a win win.

2007-12-29 07:08:29 · 11 answers · asked by romanlegionary 2 in Physics

This is a disgusting mole problem and of which I have problem solving it in a clean manner.

Question 10:

Mercury has density of 13.6 g/mL. What is the volume of 1 atom of Mercury?

In order to get the point solve this using neat and tidy steps like moles cancel out with moles etc.. type of equation so I can learn. Thankyou.

2007-12-29 07:06:47 · 5 answers · asked by Ge1st 1 in Chemistry

Koch's postulates are:

1. The microorganism must be found in abundance in all organisms suffering from the disease, but not in healthy organisms.
2. The microorganism must be isolated from a diseased organism and grown in pure culture.
3. The cultured microorganism should cause disease when introduced into a healthy organism.
4. The microorganism must be reisolated from the inoculated, diseased experimental host and identified as being identical to the original specific causative agent.

Now this is the Thing, Let's Say a Certain Disease is Cleared By Some Anti-X (e. g. Acyclovir Clearing HSV, a Beta-Lactam [Penicillin or Cephalosporin] and Some Infection). Are Not these Just as Strong a Evidence for the Presence of an microorganism as Koch's Postulates?

Furthermore, Prophylaxis, an Organism Administered Anti-X, Don't Get the Disease (e. g. HIV Post- Exposure Prophylaxis [Perhaps this Will Work In Pre-Exposure too]).

2007-12-29 07:06:06 · 8 answers · asked by Anonymous in Medicine

2007-12-29 07:05:06 · 4 answers · asked by Anonymous in Engineering

a curve on the xy-plane is defined parametically by the equations x=t^2 +t and y=t^2-t. For what values of t is the tangent to the curve horizontal?

2007-12-29 07:02:23 · 7 answers · asked by Anonymous in Mathematics

I know how to graph the equation, but need help breaking it down so it can be graphed properly.. thanks

2007-12-29 06:55:41 · 2 answers · asked by Sam o 1 in Mathematics

Are snakes intelligent creatures compared to like say rats? By intelligent I mean good problem solving skills,decision making skills used with plain brain power not instincts. For example one of my pet rats can open a cage. That shows that he is good at solving problems. Another example spiders can make webs. This is not showing intelligence this is what spiders do naturally. So what are snakes more like spiders or rats? Also I heard that in some cases rats will try to eat snakes not defend themselves is this true?

2007-12-29 06:54:53 · 6 answers · asked by Anonymous in Zoology

if y=x(ln x)^2, then y'=

2007-12-29 06:54:34 · 4 answers · asked by Anonymous in Mathematics

what is the equation of the line tangent to the curve with parametric equations x=3e^-t, y=6e^t at the point where t=0?

2007-12-29 06:53:19 · 2 answers · asked by Anonymous in Mathematics