Science & Mathematics - 25 September 2007

--Math question that im stuck on,,, any answers

2007-09-25 10:11:31 · 5 answers · asked by Anonymous in Mathematics

what is the inner structure of the Earth? Jupiter? Neptune?

2007-09-25 10:11:20 · 1 answers · asked by Anonymous in Astronomy & Space

Okay, in the last one I put no "Fake Ones" well this time I dotn care, as a matter of fact I like fake ones that give a good scare :) So if one knows of ANY scary videos under this topic please post links, Thank you :D!

2007-09-25 10:10:44 · 6 answers · asked by Rob 2 in Paranormal Phenomena

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 37 N. The coefficient of static friction between his hands and the book is 0.44. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

2007-09-25 10:10:39 · 2 answers · asked by Anonymous in Physics

2007-09-25 10:09:31 · 1 answers · asked by bilinmz 1 in Chemistry

2007-09-25 10:08:47 · 3 answers · asked by Chloe I 1 in Chemistry

A.) g(x) = x-5

B.) h(x) =
{3 if -1 < or equal to x < or equal to 1
{4 if 1 < x < or equal to 4
{x if x > 4

2007-09-25 10:08:39 · 1 answers · asked by blessed 1 in Mathematics

How can I make it stick to my brain. I need to know for tests.

2007-09-25 10:07:00 · 3 answers · asked by little bear 2 in Chemistry

ok im 13 1/2 years old and i just started the 8th grade this year..a lot of my friends that are in the same grade as me have algebra 1 but i only have pre-algebra...is that bad??

2007-09-25 10:04:55 · 12 answers · asked by donna a 1 in Mathematics

The chances are extremely slim for an asteroid threat.
You've seen the movies where our idea was to land on asteriod, drill it, and plant a nuclear weapon to break it into peices.
But let's be realistic...it's already difficult to land on the moon. And it's not even a fast-moving rock that's headed towards earth.

So what would we do?

2007-09-25 10:04:00 · 11 answers · asked by Jerry H 5 in Astronomy & Space

1/6 5/8 1/4 5/12 1/2 7/12 2/3 3/4 7/8

is this right?

2007-09-25 10:03:50 · 4 answers · asked by gone coastal 2 in Mathematics

express the answer in intervals. ***intervals as in inf and cup signs**

2007-09-25 10:02:28 · 2 answers · asked by Anonymous in Mathematics

and also, what makes it acidic or basic? my teacher says if the oxygen is formed with a metal it is basic and a nonmetal it is acidic, but what if you have like PbHO or something with a metal AND a nonmetal paired with oxygen? im so confused and cant find help in my textbook or online :(

2007-09-25 10:02:28 · 6 answers · asked by Lauren 1 in Chemistry

I've noticed that whenever they show a Tv screen or a computer screen(especially) on TV there always seem to be lines going across the screen from top to bottom (except in the highest quality video). Have you noticed that? What causes it?

2007-09-25 10:01:16 · 2 answers · asked by DichloroDiphenyl 5 in Chemistry

2007-09-25 10:00:54 · 11 answers · asked by casey 5 in Medicine

Solve using matrix multiplication:
{1 2 3} {2 -1 0}
{2 -1 4} X {3 2 5}
{ 0 1 0} {-1 -2 1}

2007-09-25 10:00:25 · 2 answers · asked by ferrariboy44 1 in Mathematics

Can they detect heat from space satellites or does the atmosphere block specific heat signals like lifeforms?

If my satellite TV goes off during a storm does that mean the worlds most powerful satellites can also not see through?

How large would a storm have to be for satellites to be blocked?

Is it true that satellites can zoom in visually so far they can read the date of a penny on the road?

Since places like NASA have to launch all the satellites is there a listing of everyone who owns a satellite and of what type it is, or what it is used for?

2007-09-25 09:59:17 · 3 answers · asked by Silly BaBy505 1 in Astronomy & Space

Is HCl a polar compound?

2007-09-25 09:57:32 · 0 answers · asked by Anonymous in Chemistry

Name 2 ways a plants stem system can help a plant survive in its enviroment

2007-09-25 09:55:08 · 2 answers · asked by justin j 1 in Botany

express the answer in intervals. ***intervals as in inf and cup signs**

2007-09-25 09:52:13 · 6 answers · asked by Anonymous in Mathematics

I dont know how how to approach to these question.

The mystery of the spinning pinwheel

Festive ornaments are usually made of metal. When the candles beneath the pin wheel are lit, the pinwheel begins to spin.


1) What energy transformation or transfers are occurring?

2) what property of the air is being applied to make this device work? (spin)

2007-09-25 09:52:02 · 1 answers · asked by dk 6 in Chemistry

I am an engineering student and I am interested in designing a device that can transmit data to a computer wirelessly. I am trying to look into Bluetooth chip and Wi-Fi chips but am not finding a whole lot for Wi-Fi.

Does anyone know pro's and con's of using Bluetooth vs Wi-Fi.

Also does anyone know some good manufacturers/distributors that I can make bluetooth or Wi-Fi chips that are transmitters? trying to find one that is the no bigger than a half dallor coin.

Or if there are any other good choices for wireless transmission I would be pleased to hear it.

Thank you

2007-09-25 09:51:58 · 1 answers · asked by kevins963 2 in Engineering

How can I do maultiplication and dividing in binary system?

example: 100101010001*1000110011011101=?
100100110010/1010101101110101=?
How can I do ( please show the details)

2007-09-25 09:51:41 · 1 answers · asked by maczenko89 1 in Mathematics

2007-09-25 09:50:19 · 4 answers · asked by karmelcoloredprincess47 1 in Mathematics

limestone rocks will be heated either by propane or a natural wood fire for a sweat lodge. once in the lodge they have water poured on them to give off steam. Do they give off dangerous gases?

2007-09-25 09:48:29 · 3 answers · asked by Neat Freak 1 in Chemistry

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=constantjerk.jpg

2007-09-25 09:47:08 · 2 answers · asked by Anonymous in Physics

express the aswer in intervals. **intervals as in inf and cup signs**

2007-09-25 09:44:56 · 1 answers · asked by Anonymous in Mathematics

How do i write a balanced dissociation reaction for each Ba_3(PO_4)_2 and BaCl_2, including appropriate charges on ions and indicating phases.

2007-09-25 09:44:38 · 2 answers · asked by Anonymous in Chemistry

Give me some examples as well plz to help!! Thnx!

2007-09-25 09:42:49 · 1 answers · asked by Anonymous in Chemistry

When potassium cyanide (KCN) reacts with acids, a deadly poisonous gas, hydrogen cyanide (HCN), is given off. Here is the equation below.

KCN(aq) + HCl(aq) KCl(aq) + HCN(g)
If a sample of 0.230 g of KCN is treated with an excess of HCl, calculate the amount of HCN formed, in grams.

Nitric oxide (NO) reacts instantly with oxygen gas to form nitrogen dioxide (NO2), a dark-brown gas.

2 NO(g) + O2(g) 2 NO2(g)
In one experiment 0.675 mole of NO is mixed with 0.378 mole of O2.
Calculate the number of moles of NO2 produced.

Consider the reaction below.

MnO2 + 4 HCl MnCl2 + Cl2 + 2 H2O
How many grams of Cl2 will be produced?

Titanium(IV) oxide (TiO2) is a white substance produced by the action of sulfuric acid on the mineral ilmenite (FeTiO3).

FeTiO3 + H2SO4 TiO2 + FeSO4 + H2O
It is opaque and its nontoxic properties make it suitable as a pigment in plastics and paints. In one process 9.90 103 kg of FeTiO3 yielded 1.80 103 kg of TiO2. What is the percent yield of the reaction?

2007-09-25 09:41:00 · 3 answers · asked by Sho V 1 in Chemistry