Science & Mathematics - 21 January 2007

I have a cheap Vicks Steam Vaporizer/humidifier that produces this weird black floaty gunk in the water basin. Anybody know what it is?

2007-01-21 05:25:14 · 4 answers · asked by morgan w 2 in Other - Science

In digesting a certain plasmid with restriction endonucleases, how do we explain if
1. One (biggest) fragment from the digestion has a size larger than the plasmid itself, and this fragment is outside the range of the molecular markers used for the digestion..contamination?
2. Why a lane for the uncut plasmid has more than one band?(since no enzyme is added, no digestion should have occurred and only one band is expected...)

it would be great if you can provide me the source of info..thanks~

2007-01-21 05:24:40 · 2 answers · asked by KeenaUsas 1 in Biology

2007-01-21 05:23:23 · 5 answers · asked by Anonymous in Geography

These are three questions on my homework, you can choose which one to solve, and whoever has the best, explained answer will get a best answer, guaranteed!

Write an equation of the line that is perpendicular to the given line and passes through the given point.

1) y= 2x - 1, ( 2, 4 ) 2) y= -1/3x + 2, (5,1) 3) y= 4x + 5, (4,3)

2007-01-21 05:23:01 · 7 answers · asked by Tameeka 1 in Mathematics

between green and blue which is rarer

2007-01-21 05:22:46 · 4 answers · asked by K B 2 in Medicine

This request is for outdoor thermometers

2007-01-21 05:21:48 · 2 answers · asked by Charles B 1 in Engineering

2007-01-21 05:20:26 · 5 answers · asked by Anonymous in Mathematics

i have to make line tracer of dimens 200mm*200mm*200mm.arena is of dimens2000mm*2000mm hving black background.line to be followed is in white/redcolour&20 mm wide.track will b divided into 5 segments.without using micrcontroller.allowed weight is 4kg.power supply is12v.

2007-01-21 05:19:45 · 1 answers · asked by satish *kumar 1 in Engineering

2007-01-21 05:19:00 · 1 answers · asked by Lord Of Night 1 in Engineering

Why isn't it snowing? I live in New York and we have only recieved about .5 of an inch since November. What is going on?
Here is a radar from about 20 minutes ago...
http://image.weather.com/looper/archive/us_ne_4regradar_plus_usen/5L.jpg?1169403059609

That look like it is going to hit NY right? Wrong! We are only planeed to get a few flurries tonight.

Why arn't we getting any snow this winter even though it is below freezing.

2007-01-21 05:18:52 · 6 answers · asked by diiiiilooooch 3 in Weather

2007-01-21 05:17:59 · 4 answers · asked by connor 1 in Earth Sciences & Geology

a rube goldberg machine is where a bunch of chain reactions get set of to do a simple task. It wold be nice if you have any links to simular things.

2007-01-21 05:16:57 · 5 answers · asked by ghostcoasterboy 2 in Engineering

also what is the difference between a flexor and an extensor?

ahh Biology hurts my brain..

2007-01-21 05:15:46 · 6 answers · asked by heyheyhey 2 in Biology

imagine a parallelogram with corners 'ABCD' (its slanting to the right)

bottom left - D
bottom right - C
top left - A
top right - B

Prove that triangles ABD and BCD are congruent.

the question is worth 3 marks

2007-01-21 05:14:32 · 6 answers · asked by jenny 1 in Mathematics

The word has 13 letters. This is hard! This is not even in my book.

2007-01-21 05:13:42 · 1 answers · asked by Anonymous in Biology

For example, can anyone tell me what's the nearest distance between 2 points on a sheet of paper? Most of them would say a straight line joining them would be the shortest distance. I read somewhere that it's actually zero. The trick is this, you fold the paper and woo! zero distance! This applies I think to this universe as well. For example you want to go to this place in maybe Saturn. If you have the power to fold space and time you would be there instantly! Sounds interesting but like impractical.

To add on the time travel, i think that the fact we can travel back in time only if we can go beyond the speed of light.(although i think we will break into massless particles before we hit it) but i think seriously maybe in the future when we invent more we can do this time travel.

2007-01-21 05:13:12 · 5 answers · asked by sh 1 in Astronomy & Space

Cocina-rock formed from shells commonly found in Florida

2007-01-21 05:11:10 · 4 answers · asked by Kathleen F 2 in Earth Sciences & Geology

a boy has a pen that is of length 10cm, measured to the nearest centimetre.
His pen case is of length 10.1m, measured to the nearest millimetre.

Explain why it might not be possible for him to fit the pen in the pen case.


(is it something to do with that the pen might be 10.49cm and the case might be 10.5?... if so how do i explain it)

2007-01-21 05:10:56 · 2 answers · asked by jenny 1 in Mathematics

2007-01-21 05:09:38 · 6 answers · asked by ningabo 2 in Weather

2007-01-21 05:09:15 · 6 answers · asked by Anonymous in Astronomy & Space

I am a college going student n I want to know abt the construction of flyovers on the sea.Basic thing I want to know is how do they insert the piller into deep sea

2007-01-21 05:07:53 · 3 answers · asked by swap 1 in Engineering

2007-01-21 05:06:18 · 23 answers · asked by ningabo 2 in Weather

2007-01-21 05:05:50 · 2 answers · asked by ziyabudeen 1 in Engineering

2^3-2^2(2(3-2^2)+2^2(2*3-2^2))

2007-01-21 05:04:36 · 11 answers · asked by Brent S 1 in Mathematics

2007-01-21 05:04:31 · 8 answers · asked by STUDAWG 1 in Zoology

2007-01-21 05:03:11 · 11 answers · asked by checkers 1 in Mathematics

I'm not sure if I've phrased the subject correctly, but I'm still unsure of the outcome of this classic contest.. Imagine that one day an alien comes and zap our moon, making it disappear.. Will we see the tide rises and falls before seeing the moon disappear? i.e. Will the influence of gravity be exerted faster than the speed of light? Of is C the ultimate speed limit of all things?

2007-01-21 05:00:13 · 17 answers · asked by sh 1 in Astronomy & Space

Find the are of the smaller rectangle (inside the larger one) given that the area of the larger rectangle is 2x^2 + 9x + 10.

The Width of the larger rectangle is X+2. The width of the smaller rectangle is 2.

It is tough to imagine without the picture in the book, but the smaller rectangle is shorter in both length and width, by X (or the unknown length of X)

Not looking for a numerical answer, just the mathmatical equation which represents the area of the smaller rectangle.

There is no length given for either triangle.

Is there anyone who might help in solving this seemingly simple problem??

Thanks for any help. I know it has something to do with factoring a trinomial...since that is the chater we are on.

2007-01-21 04:57:15 · 2 answers · asked by billy_0_69 2 in Mathematics

i dont understand this at all so please just give me the answers okay so the teacher said she wanted each step show so here are the questions (1.)5+4(x+1)=5 (2.) 4(2x-1)=negative10(x-5)
(3.)4(x+5)-3(x+2)=14

2007-01-21 04:57:11 · 3 answers · asked by Anonymous in Mathematics

find the unit tangent vector to the curve at their points of intersection?

y=x^2
y=x^(1/3)

I am not exactly sure what it is asking of me
thank you jen

2007-01-21 04:56:11 · 3 answers · asked by Jen H 1 in Mathematics