Science & Mathematics - 19 January 2007

some of my students are working with phosphorescent paper. They are looking for any object the "appears invisible" by being clear, yet still blocks the light? They want to put the object on the paper so that a person a few feet away can't see it, but when the phospor paper is hit by the light, the shadow of the object apears.

I think it's a very cool idea, but I also a think it's a real long shot. I really need some help from you science geniuses that hang out here.

2007-01-19 10:20:12 · 6 answers · asked by Anonymous in Physics

2007-01-19 10:19:58 · 4 answers · asked by haileybaby331 1 in Mathematics

http://www.freewebs.com/stealputfile/TrigOhNo.JPG

I've drawn a picture of the problem and I really have no clue where to start. If somebody could guide me step by step through this it would be mucho appreciated. :) Thanks

2007-01-19 10:19:42 · 2 answers · asked by Anonymous in Mathematics

a 85 to 120 pound girl or boy weigh on saturn

2007-01-19 10:19:40 · 10 answers · asked by horses7 1 in Astronomy & Space

I know of at least one method, diluting it and slowly pouring into the drain, but it can still stain and eat away metals in the pipes a bit. Is there something else I could use to possibly just "neutralize" it? I think an alkaline metal nitrate would work (Li;Na;K) or some other salt. That or maybe even just try to get the pH as neutral as possible.

2007-01-19 10:18:51 · 3 answers · asked by Francis X 1 in Chemistry

2007-01-19 10:17:33 · 22 answers · asked by Anonymous in Astronomy & Space

Ignoring how long it takes initially to heat the house to 70 or 80 degrees, maintaining the temperature once it's there should take the same amount of heating. Yes or no? IE, heating the house from 69 to 70 degrees takes the same amount of energy to go from 79 to 80?

2007-01-19 10:15:02 · 12 answers · asked by Paper M 1 in Physics

2007-01-19 10:11:19 · 10 answers · asked by Wogboy 1 in Mathematics

2007-01-19 10:10:03 · 8 answers · asked by Adriane 2 in Mathematics

2007-01-19 10:09:30 · 6 answers · asked by junes 1 in Botany

2007-01-19 10:08:44 · 7 answers · asked by Anonymous in Mathematics

log2 * log3

2007-01-19 10:08:34 · 3 answers · asked by Ha!! 2 in Mathematics

What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule?
A.
The DNA molecule would replicate itself.

B.
Transcription would proceed, and a protein would be produced.

C.
The RNA polymerase would cut the DNA molecule in half.

D.
Transcription would not take place, and the protein would not be produced

2007-01-19 10:06:55 · 1 answers · asked by Skylar 1 in Biology

Can someone please help?

Is g(x) = -12.5(1.72)^x

1. concave up and increasing
2. concave up and decreasing
3. concave down and increasing
4. concave down and decreasing

I can't figure it out...

2007-01-19 10:06:21 · 5 answers · asked by Anonymous in Mathematics

Besides my basic classes, I want to know what classes will prepare me for becoming a neurologist.

2007-01-19 10:05:35 · 11 answers · asked by Keiko 1 in Medicine

How many moles of sodium are there in 2.5 moles of Na3PO4

2007-01-19 10:05:25 · 4 answers · asked by hey hey. i'm here to stay. 2 in Chemistry

the worsd is from biology

2007-01-19 10:03:41 · 3 answers · asked by Anonymous in Biology

If x= -2, find the value of x-2x(squared) -(2x)(squared).

2007-01-19 10:03:19 · 14 answers · asked by SallyJane 3 in Mathematics

Nasa put a set of these on the Moon for the purpose of sending a laser-beam back to its source, to accurately measure its distance from the Earth.
The same principle is used with reflectors, like on bumpers and lane-divider buttons on a highway.
Thanks.

2007-01-19 10:01:31 · 4 answers · asked by ? 4 in Astronomy & Space

Here is the problem: The sum of two integers is 10. Three times the larger integer is three less than eight times the smaller integer. find the integers

could you show work please so I can practice!!!!

2007-01-19 10:00:52 · 6 answers · asked by referencearea 2 in Mathematics

A.
through recombinant DNA

B.
through proteins

C.
through plasmids

D.
through RNA polymerase

2007-01-19 10:00:50 · 1 answers · asked by Skylar 1 in Biology

why do tigers have this white thing on their ear?.I love tigers and ive been wondering.

2007-01-19 10:00:42 · 6 answers · asked by All 1 in Zoology

I have a motor (3ph) that the rpm is 1725, my gear box has a ratio of 10:1, what is my speed on the shaft atached to this gear box and what is the formula?....thanks for your input.

2007-01-19 09:59:46 · 3 answers · asked by hector596 2 in Engineering

If someone overdosed on sleeping pills, what treatment would the hospital give them? This is for a piece of fiction, I'm not suicidal or anything.

2007-01-19 09:57:20 · 3 answers · asked by S 2 in Medicine

2007-01-19 09:56:40 · 9 answers · asked by mz.shunta2008 1 in Mathematics

2007-01-19 09:56:20 · 8 answers · asked by Anonymous in Zoology

2007-01-19 09:56:08 · 10 answers · asked by goring 6 in Astronomy & Space

2007-01-19 09:51:17 · 14 answers · asked by lllspoonslll 1 in Mathematics

Two positive integers are in the ratio of 7:2. If 3 is added to each and the larger of the resulting numbers is then divided by the smaller of the resulting numbers, the quotient is 2 and the remainder is 12. Find the larger of the original numbers.

2007-01-19 09:50:41 · 6 answers · asked by SallyJane 3 in Mathematics

Just a little math homework!

2007-01-19 09:50:02 · 9 answers · asked by Adriane 2 in Mathematics