Science & Mathematics - 20 September 2007

how do they get it to keep its position. and circle the gloab without floating away or the earth pulling it in.

2007-09-20 07:27:19 · 31 answers · asked by WhoAKinkyBugga 3 in Astronomy & Space

when does a plant give out oxygen and when does a plant give out carbon?

2007-09-20 07:27:13 · 14 answers · asked by underworld 2 in Earth Sciences & Geology

acetone, methyl alcohol, or ethyl alcohol

2007-09-20 07:24:19 · 3 answers · asked by Jenn 2 in Chemistry

I need to label these three chemicals: Methyl Alcohol, Normal Amyl Alcohol, and Salicylic Acid.

Are they:
Aromatic
Irritant
Caustic
Corrisive
Oxidizer
Reducer
Volatile
Flammable
Poisonous
Toxic

2007-09-20 07:23:18 · 2 answers · asked by Jenn 2 in Chemistry

I have been advised to use Chloramphenicol eyedrops (which are an antibiotic, but available over the counter).

I have begum taking them as instructed, and know I must use extra contraception as the drops can stop The Pill from working. But as sperm can live inside you for 3-5 days, won't it stop my Pill from last night working? And leave me open to pregnancy?

2007-09-20 07:22:01 · 3 answers · asked by Anonymous in Medicine

the asteroid icarus, though only a few hundred meters across, orbits the sun like the planets..its period is 410d.. what is its mean distance from the sun??

2007-09-20 07:20:29 · 3 answers · asked by nur asyikin s 1 in Physics

Evaluate how fast can a bicycle ride that after pushing a stick into the front wheel, the bicyclist won't flip over his head? Wheels and a stick are strong and unbreakable.
(I need to create a physical model with variables, equations and so on).

Thanks in advance.

2007-09-20 07:13:24 · 2 answers · asked by Pythagor 1 in Physics

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2007-09-20 07:13:01 · 4 answers · asked by mr i don't know 2 in Engineering

2007-09-20 07:07:56 · 8 answers · asked by Rick 1 in Engineering

2007-09-20 06:58:18 · 10 answers · asked by Anonymous in Geography

2007-09-20 06:58:14 · 10 answers · asked by goldenwingsxx 2 in Physics

1.How many grams of solid barium sulfate form when 19.4 mL of 0.160 M barium chloride reacts with 58.6 mL of 0.055 M sodium sulfate? Aqueous sodium chloride is the other product.

2007-09-20 06:53:46 · 4 answers · asked by Anonymous in Chemistry

Find the equation of the plane containing these two lines...

L1(t) = < -7, 3, -2 > + t < 4, 0, -1 >

L2(t) = < 0, 1, -7 > + t < 1, 2, 3 >

I'm so confused. Please help.

2007-09-20 06:49:36 · 3 answers · asked by bigbadbutters05 2 in Mathematics

Find the equation of the tangent plane to x^2+y^2+z^2 = 7z at the point (3,-1,2)

*The answer is 6x-2y-3z=10, but I don't know how to do this problem. Please show me the steps.
Thanks.

2007-09-20 06:39:40 · 2 answers · asked by dkmu 1 in Mathematics

2007-09-20 06:36:46 · 26 answers · asked by Anonymous in Biology

My professor is really general... In one of her questions she wants us to look at the equilibrium equation for the dissociation of aicd HCl into ions.

Eq=[H][Cl]

& wants to know what an "appopriate value for Ka would be"...

She didn't give us any numbers so I know she is looking for an answer like negative, or really small, or positive & wants us to justify it. But I missed yesterday's lecture & don't understad... Help!!!

2007-09-20 06:36:14 · 3 answers · asked by Anna 4 in Chemistry

Is latitude north and south or east and west? Same with longitude. Please tell me.

2007-09-20 06:30:13 · 8 answers · asked by Brian 2 in Geography

If a 73.0-foot flagpole casts a shadow 51.0 feet long, what is the angle of elevation of the sun (to the nearest tenth of a degree)?

2007-09-20 06:29:23 · 7 answers · asked by Princess 2 in Mathematics

2007-09-20 06:21:25 · 6 answers · asked by justblaze322 1 in Mathematics

..the easy way :)

NaBH4 + BF3 ====> B2H6 = NaBF4


thnx

2007-09-20 06:20:19 · 2 answers · asked by Cookie Monsta 1 in Chemistry

Three allotropes of phosphorus are observed. One has a molecular weight of 31. How many atoms of phosphorus are in the molecule? (It should be a whole number.)

2007-09-20 06:18:24 · 1 answers · asked by Anonymous in Chemistry

*****there are THREE ANSWERS total******
pre cal problem. please help.

2007-09-20 06:12:30 · 7 answers · asked by icygurl555 1 in Mathematics

*****there are FOUR ANSWERS total****
pre cal prob please help.

2007-09-20 06:09:37 · 4 answers · asked by icygurl555 1 in Mathematics

proof that y=z

2007-09-20 06:07:53 · 3 answers · asked by Curious 2 in Mathematics

A beam of green light, wavelength = 544 nm, is incident normally on a single slit of width w. The diffraction pattern is displayed on a screen placed 1 m from the slit.

The distance between the 1st and 2nd minima of this pattern is measured to be 2.4 cm. Calculate the width of the slit

2007-09-20 06:04:57 · 1 answers · asked by   4 in Physics

2007-09-20 06:04:47 · 8 answers · asked by drifter129 2 in Astronomy & Space

Find c so that both functions are continuous.

(x + 3), x is less than/equal 2
(cx + 6), x is greater than 2

2007-09-20 06:01:32 · 2 answers · asked by dizzawg16 3 in Mathematics

in the fom a+bi, where a and b are real numbers.
please help. pre cal problem.

2007-09-20 05:58:30 · 9 answers · asked by icygurl555 1 in Mathematics

2007-09-20 05:55:33 · 3 answers · asked by Roshni 2 in Engineering

I am studying in a 8th grade science class. I got this question thingy that says that this girl got some soap and got tired ofdroping it in the tub. So she went out and bought Ivory soap. I am suppose to write my hypothesis, state the problem and create an experiment. First i have to figure out why Ivory soap floats and not regular soap. Can any one help me on how to find that out and then if you could suggest a way to create a experiment?

2007-09-20 05:54:29 · 14 answers · asked by hardworker :D 2 in Chemistry