Science & Mathematics - 10 December 2006

Look i know what Hgb= Hemoglobin and Hct= hematocrit tests are..but why do you need 1 hr after last unit of packed RBCs has completed. Why one hour....to make effect? Can you explain more..is there a rationale here.

2006-12-10 18:39:54 · 2 answers · asked by noname 2 in Medicine

2006-12-10 18:33:56 · 7 answers · asked by Anonymous in Physics

a. tan 2X

b. cos 2X

c. sin 2X

I'm unable to figure out how the answer key came up with th e following answers: a. 12/5 , b. -5/13, c. -12/13
Please show me why these answers are correct.

2006-12-10 18:25:12 · 3 answers · asked by keenan93312 1 in Mathematics

it is about stuff like weather

2006-12-10 18:23:42 · 9 answers · asked by juma m 1 in Weather

Express log5 in terms of a and b where a=log2 and b=log3

2006-12-10 18:22:18 · 2 answers · asked by gctoinfinity 1 in Mathematics

I need information about "Hox Genes",and speicially in fishes.
Tell me what is that? what do? where on the body can be found? and please give me some refs and sites about it.

2006-12-10 18:22:01 · 1 answers · asked by Anonymous in Biology

Sometimes, at night, I hear someone breathing as if they were in my room, but there's no one but me. I've thought it might come from the people upstairs or from my parents' room, which is beside mine, but the breathing is too clear to come from outside.
It's driving me crazy, though it never lasts too long.
Is there a logical, physical, non-superstitious reason for that? I.e., something in the architecture of our building.

2006-12-10 18:20:51 · 6 answers · asked by Anonymous in Physics

Come up with some kind of real-world situation that is related to each of the following addition or subtraction problems.

1. -119 - -119
2. -119 - 119
3. -20 - 4
4. 50 - 30
5. 18 - (-7)
6. -10 + 12
7. -5 + 3
8. -30 + -14
9. -18 + -20
10. -50 - -65
11. 250 - 0.15 * 250 (that's 250 minus 0.15 times 250)
12. (1/3) * 120 (one-third times one hundred twenty)
13. 2 * -18.50 (2 times -18.50)
14. -83 / 3 (-83 divided by 3)

2006-12-10 18:18:26 · 12 answers · asked by buddrfly421 1 in Mathematics

I read about this famous vegetable eaten by sailors passing by Kerguelen Island in the South Indian Ocean. If it is famous, we should be able to grow this crop elsewhere in the world commercially.

2006-12-10 18:14:00 · 2 answers · asked by sanomiya115 1 in Botany

Please in ENGLISH tell me what it is and more importantly why I should care. Can you give a quantitative example of when they woudl be used.

Please to do not cut and paste from Wikipedia. I consider that an excelent example of what an answer that is NOT in english looks like.

2006-12-10 18:13:56 · 2 answers · asked by selket 3 in Mathematics

In HCl, the 1s of the hydrogen overlaps with what of the chlorine?

1) 1s 2) 2s 3) 2p 4) 3s 5) 3p

i think it's e, but i don't know how. how do i figure this out? thanks

2006-12-10 18:13:39 · 3 answers · asked by Anonymous in Chemistry

Does prescription medication really expire. I know there is a "use by" date on the bottle but can it have adverse reactions? I've heard that the medication just looses its potency over time. The reason I ask is I had pleurisy about a year and a half ago (an infmamation of the lining around the lungs) I have an anti-inflamatory that was prescribed for me and recently I am having the same symptoms. So are there any risks to taking the meds?? The "use by" date on the bottle was about 6 months ago.

2006-12-10 18:12:50 · 13 answers · asked by Troy D 2 in Medicine

2006-12-10 18:09:24 · 11 answers · asked by Navaneet 1 in Physics

The density of water is 1.0 g/mL, whereas that of mercury is 13.6 g/mL.

What is the pressure in atmospheres on the body of a diver if he is 40. ft below the surface of the water when atmospheric pressure at the surface is 0.98 atm?

2006-12-10 18:09:23 · 2 answers · asked by magicalplaygirl 1 in Chemistry

I was reading a book by Bill Bryson "A short history of nearly everything" the other day. Here is the question "if we manipulate the human gene structure, would that effect the way life is known to us ? would it be possible to create a species that does not require oxygen to breath, no food to get enrgy, no disease, no aging. I have heard some scientists are already working on the "no aging" idea. How far that is true ?

2006-12-10 18:09:19 · 3 answers · asked by yasir_sahab 1 in Biology

2006-12-10 18:08:51 · 4 answers · asked by Rockstar 6 in Mathematics

2006-12-10 18:00:49 · 17 answers · asked by Caroline 3 in Astronomy & Space

i understand how to do it when theres only sins to solve for, but what do i do when theres cos and sins?? please show your steps or explain how to do it

other problems are:
2sinxcosx=cosx
3sin^2x-8cosx=0 (use calc)
and
3sin2x-2cos(^2)2x

2006-12-10 18:00:47 · 4 answers · asked by Anonymous in Mathematics

Why sometimes does the moon look like it is at a normal distance away from earth and is white and then the next night it looks very close to earth, it looks HUGE and its an orange color? And this will happen at the same time of night...i drive my sister to work at 10:30 at night and sometimes its little and white and others its huge and orange...Can someone explain this to me?

2006-12-10 18:00:42 · 5 answers · asked by Jamie 2 in Astronomy & Space

2006-12-10 17:55:32 · 4 answers · asked by JustMe 2 in Biology

the atom having more than 4 valence electron are conductor in nature, those having less than 4 or having non are Insulator and those are having exactly 4 valence electron are called semiconductor. The best known Semiconductor are Silicon(Si) and Germanium(Ge)
having 4 valence electron in their outermost orbit. Carbon is also having 4valence electron in outemost orbit but is not a semiconductor. Why?

2006-12-10 17:55:31 · 8 answers · asked by hansi 1 1 in Physics

2006-12-10 17:54:18 · 9 answers · asked by Tony J 1 in Astronomy & Space

2006-12-10 17:53:09 · 3 answers · asked by block_binder 1 in Mathematics

hello

2006-12-10 17:49:37 · 6 answers · asked by Anonymous in Mathematics

Need the definition in layman's terms.

2006-12-10 17:47:36 · 1 answers · asked by kim 1 in Mathematics

2006-12-10 17:46:31 · 6 answers · asked by gumzy_gurl18 1 in Chemistry

For producing power from sunlight

2006-12-10 17:44:26 · 4 answers · asked by max9del 1 in Engineering

if i have Pb(NO3)2

is it the Pb that has the positive 2 charge

(since you have to make them neutral)

is this right?

2006-12-10 17:43:12 · 2 answers · asked by ... 3 in Chemistry

1. Why does it take less time to fly eastwards than westwards for the same distance?

2. Why are transatlantic flights often diverted northwards to near Iceland or Greenland, instead of flying directly?

2006-12-10 17:43:01 · 6 answers · asked by Anonymous in Geography

2006-12-10 17:41:59 · 9 answers · asked by brims 1 in Mathematics