Science & Mathematics - 23 October 2006

I went to the pub last week. There was a penny in the urinal. It was all brown and manky and looked old. When I was there yesterday there was a penny in the same urinal but it was all shiny.

Was it the same penny? Can urine or urinal cakes clean up coins?

2006-10-23 22:00:37 · 20 answers · asked by C T 4 in Chemistry

2006-10-23 21:50:57 · 13 answers · asked by a_zx2003 2 in Biology

2006-10-23 21:43:36 · 3 answers · asked by StéphanDeGlasgow 5 in Other - Science

Is a vacuum literally an area that has no chemical elements ie oxygen, helium, etc etc, and if so what would happen to a human being if he was to step into a vacuum? would he vaporise instantly?

2006-10-23 21:29:06 · 5 answers · asked by Anonymous in Physics

In a quadratic, the question was
x - 3√x - 10 = 0 and it gave that x > 0

So if I used √x to solve it then (√x - 5) (√x + 2) = 0
then √x = 5 or √x = -2
So x would be 25 or 4.
I'm just wondering now if √x can equal -2, and if someone could explain.
Thanks,

2006-10-23 21:25:03 · 14 answers · asked by D.m.l 2 in Mathematics

2006-10-23 21:24:34 · 3 answers · asked by fine 1 in Engineering

i have test tomorrow could u guys help me to get good answer??

2006-10-23 21:24:17 · 3 answers · asked by Anonymous in Geography

2006-10-23 21:23:38 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Since its all blue in the day why is it clear at night?is it all an illusion?

2006-10-23 21:21:28 · 11 answers · asked by Anonymous in Astronomy & Space

2006-10-23 21:20:50 · 3 answers · asked by vinu 1 in Botany

bohr's model? how is it structured?

2006-10-23 21:19:43 · 2 answers · asked by Hero 2 in Chemistry

with the help of some crazy scientists who made the apes clever?

2006-10-23 21:14:27 · 17 answers · asked by Anonymous in Other - Science

I mean with millions of stars with a possible million more planets, combined with carbon based life, combined with space age techonlogy minus the Bush administration. Could it have happened already? Are they looking for us?

2006-10-23 21:11:32 · 6 answers · asked by laxeroflax04 2 in Astronomy & Space

2006-10-23 21:09:51 · 14 answers · asked by socceruel 1 in Astronomy & Space

I mean i am a studying computer engineering and i have decided that in my futurre thesis i want to make robotics w/ the combination of an AI (artificial intelligence)for security by my self coz my classmates got no brains to imagine a thing like this, but is it funny thinking things like this that i should do coz its kind of complicatted(to much for my self) just for a thesis. i know this is a stupid question but my dreams are in chaos and i dont want to end up beaten by my complicated and chaostic dreams coz i just want to be a scientist(engineer) :( Guys what do you recommend me to do? plzzzz :( help me ahuhuhuhuhu (^o^)

2006-10-23 21:00:12 · 1 answers · asked by Chris 2 in Engineering

TOTAL 3 qns:
A child slides across a floor in a pair of rubber-soled shoes. The friction force acting on each foot is 22 N, the footprint area of each foot is 16 cm2, and the thickness of the soles is 5.0 mm. Find the horizontal distance traveled by the sheared face of the sole. The shear modulus of the rubber is 3.0 106 Pa.

Another qn:
9.16 A 10.0 kg block of metal is suspended from a scale and immersed in water as in Figure P9.30. The dimensions of the block are 12.0 cm 10.5 cm 10.5 cm. The 12.0 cm dimension is vertical, and the top of the block is 5.00 cm below the surface of the water

a) What are the forces exerted by the water on the top and bottom of the block? (Do not ignore the effect of the air above the water. Take P0 = 1.0130 105 N/m2.) Ftop N
Fbottom N
(b) What is the reading of the spring scale?
N
(c) Show that the buoyant force equals the difference between the forces at the top and bottom of the block.

2006-10-23 20:50:53 · 1 answers · asked by Anonymous in Physics

What happens if we are all just programs in someones computer. I mean it sounds crazy but can you prove me wrong?!?!?

2006-10-23 20:42:02 · 13 answers · asked by darrkadlubowski 3 in Other - Science

How can it end I mean saying that you are flying in a space ship you cant just hit a wall of nothing can you? and how would their be an end would you circle around. but then the universe is a ball. But then whats outside of the ball. Or are we all just computer programs that kids are playing at their homes and we don't even exist. For all we know we could be computer programs.

2006-10-23 20:36:43 · 10 answers · asked by darrkadlubowski 3 in Astronomy & Space

2006-10-23 20:36:17 · 2 answers · asked by selot62 1 in Physics

. The volume of the can is 3 centimeters. What is the measurement of the height

2006-10-23 20:30:50 · 7 answers · asked by ^*({K})r3My~(S)$yn luv$2play 1 in Mathematics

2006-10-23 20:25:02 · 15 answers · asked by lil_sweet_cookie 2 in Other - Science

does the colors mentioned produce maroon when mixed together?

2006-10-23 20:24:12 · 9 answers · asked by newfred61 1 in Chemistry

a) f: R --> R, f(x) = 5x + 6
b) f: R --> R, f(x) = x^(3)
c) f: R --> R*R, f(x) = (x,x)
d) f: R --> R, f(x) = square root of x
e) f: Z*Z --> Z, f(m,n) = m - n

Here R and Z indicates Real numbers and integers, respectively.

2006-10-23 20:21:18 · 3 answers · asked by kenilabcl 1 in Mathematics

I am a new product developer and I have no formal training in chemisrry or atomic physics. If you're in the know as it pertains to atomic chemistry Boy would I like to talk to you
my direct email is

dylstar7@yahoo.com

I've been toying with geophysic for some time now
my calling is to stop global warming in its tracks and through the creation of new and distinct forms of thinking that stretch well beyond Al Gore's primary adgenda- to actually leave my mark in history by rapidly counteraqcting a thousand years of global abuse by our species

2006-10-23 20:20:04 · 3 answers · asked by Anonymous in Physics

not necessarily face-to-face of cause.

2006-10-23 20:19:57 · 5 answers · asked by lulu wasp 1 in Mathematics

2006-10-23 20:16:11 · 17 answers · asked by Kingg P 1 in Astronomy & Space

2006-10-23 20:15:33 · 6 answers · asked by Anonymous in Earth Sciences & Geology

f: R --> R
f(x) = (1/2) * (x + IxI)
a) is f 1-1 and onto? Justify your answer.
b) What is the range of f on a) R and b) R+

2006-10-23 20:15:26 · 5 answers · asked by kenilabcl 1 in Mathematics

2006-10-23 20:14:51 · 12 answers · asked by newfred61 1 in Chemistry

2006-10-23 20:12:24 · 6 answers · asked by ABHAY C 1 in Engineering