Science & Mathematics - 28 January 2007

If you have a ball of clay, and mold it into a bunch of shapes, does the volume change? i know the density and the mass do, im not so sure about the volume

2007-01-28 12:27:02 · 3 answers · asked by ? 2 in Physics

help me put this method in past tense plez...thanks for your help and sharing your knowlege..in advance..this mean alot to me.

Method:
-A few green leaves were cut into small pieces and placed in the motar.

-The pieces of green leaves were ground with purified sand in 3cm^3 of Ethanol,until a green extract was obtained.

-A spot of extract was placed 2cm from the end of the chromatography paper.More spots were added at the same point and allowed to dry.

-The paper having the green extract was then attached to a glass cover an suspended in the beaker containing the ethanol.

-The green spot was positioned above the surface of the ethanol and the bottom edge of the paper just below the surface.

-The solvent was allowed to move up the paper.After this,the chromatography was removed from the beaker and allowed to dry.

2007-01-28 12:26:18 · 2 answers · asked by Anonymous in Other - Science

2007-01-28 12:24:34 · 5 answers · asked by Augustine M 1 in Earth Sciences & Geology

Could it be they each carried a recessive trait for beauty and I luckily inherited both traits, from that 25% chance! I think ugliness is a dominant trait cuz almost all my family is ugly!

U- Uglyness
u- Beauty

Uu x Uu

U.: u.:
/////////////////
U.: UU // Uu
u.: Uu // uu <<<--- That's me!



BTW this was all a joke, I was just making fun of punnet squares!

2007-01-28 12:23:57 · 7 answers · asked by Anonymous in Biology

PlZ some one answer

2007-01-28 12:23:53 · 4 answers · asked by ☆Stranger in a Sunset☆ 3 in Weather

what did he do? why do you like what he did? why do you dislike what he did?

2007-01-28 12:22:05 · 4 answers · asked by Anonymous in Astronomy & Space

2007-01-28 12:21:07 · 5 answers · asked by Anonymous in Physics

A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2 --> 2LiF. After the reaction is complete, what will be present?

a.2.16 moles lithium fluoride only
b.0.789 moles lithium fluoride only
c.2.16 moles lithium fluoride and 0.395 moles fluorine
d.0.789 moles lithium fluoride and 1.37 moles lithium
e.none of these

2007-01-28 12:20:55 · 2 answers · asked by Anonymous in Chemistry

Just imagine that as soon as a baby is born, maybe even while the baby is developing in the womb, doctors take all of the blood and bone marrow out and replace it with a superior substitute - like a serum the generates oxygen all on it's own. Do you think that it would be the first stepping stone towards immortality?

2007-01-28 12:20:00 · 3 answers · asked by Jerse 3 in Medicine

2007-01-28 12:19:56 · 5 answers · asked by stlouiscards8 3 in Chemistry

My high school chemistry teacher told us about mixing some things and getting a solution that after drying on a surface (such as a driveway) would make loud cracks when walked on or driven over. This would be a great way to get back at some friends, but I cant remember what to mix to get this. Does anyone know?

2007-01-28 12:18:07 · 3 answers · asked by anonymous 2 in Chemistry

2007-01-28 12:17:47 · 15 answers · asked by Nicholas J 1 in Astronomy & Space

I take adderal to stay up late at night to study and do my homework i don't have add but i went to my doctor and told him that i think i have a.d.d. and that i think adderall would be good for me.

I was wondering if it is really that bad for me and is it considered cheating. I don't abuse or use it except only for studying which is just about a couple on the weekends and maybe 2 or 3 during the week. and there 10mg... also does anyone else do this to study if you do OR don't tell me your thoughts about it.

2007-01-28 12:17:30 · 2 answers · asked by Anonymous in Engineering

Seems like crossing space the conventional way (chemical and ION engines) takes a really long time to get where you're going.

Is anyone working on the next quantum leap forward for propulsion? I hate to use the term 'WARP' engine because it involves warping space and time but isn't that the way it needs to be done to cross great distances.

So, the question remains, is anyone working on the next big deal for crossing space? Can you point me to any web sites?

2007-01-28 12:16:53 · 3 answers · asked by Max P 1 in Astronomy & Space

2007-01-28 12:16:39 · 10 answers · asked by tallie18 2 in Earth Sciences & Geology

A helicopter is ascending vertically with a speed of 1.00 m/s. At a height of 70 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
s

2007-01-28 12:16:01 · 2 answers · asked by nafiseh g 1 in Physics

Please help me! A friend gave me a page of brainteasers and I have figured them all out except for this one.

2007-01-28 12:15:51 · 3 answers · asked by Megan 2 in Mathematics

Everything has an end, right? What is beyond the sky? Where does the universe end? Where does it begin?

There is no good or right answer for this question. Any speculations are appreciated, scientific or philosophical.

2007-01-28 12:13:01 · 11 answers · asked by inSane 2 in Astronomy & Space

2007-01-28 12:11:05 · 4 answers · asked by seeker 1 in Physics

A pulley with diameter 0.5 meter is being used to lift a box. How far will the box weight rise if the pulley is rotated through an angle of 5pi/3 radians?

2007-01-28 12:11:02 · 5 answers · asked by Mike R 2 in Mathematics

2007-01-28 12:11:00 · 2 answers · asked by Anonymous in Biology

Plane 1, x+2y-z=8
Plane 2, 2x-y+z=-3
Plane 3, 3x+y+4z=-7

1. find the point of intersection of the 3 planes
2. plane 4 is perpendicular to plane 1 and 2, and passes through the pt found above, find plane 4
3. plane 5 is parallel to plane 3 and pass throuh the pt (1,1,1), find plane 5
4. find the intersection of plane 4 and plane 5

2007-01-28 12:10:41 · 1 answers · asked by Anonymous in Mathematics

2007-01-28 12:10:28 · 8 answers · asked by alleykat1971 2 in Weather

A stone is dropped from the roof of a high building. A second stone is dropped 3.00 s later. How far apart are the stones when the second one has reached a speed of 13.0 m/s?
m

2007-01-28 12:08:57 · 5 answers · asked by nafiseh g 1 in Mathematics

i am making my schedule for my junior year
i have to drop one of the classes because of physics.
(There's no space if I add physics on my schedule)

So which one should I take for my junior year, chemistry AP
or Biology AP?

2007-01-28 12:08:38 · 9 answers · asked by Daine W 2 in Chemistry

I am really sorry to ask this question but it's about science and it's my worst subject. I even googled and yahooed this question but weird answers came up, so can you please answer this question without giving me URL's and stuff..THANX

Why is silicon important?

What would happen if Silicon never existed?

PLEASE...I KNOW THESE MIGHT BE EZ QUESTIONS...but sorry I am not good at sciene so this was my only hope. :]

THANK YOUUUUUU!!!!!!!!!!!!!!!!!!!!!!!!!

2007-01-28 12:07:49 · 3 answers · asked by Miss Universe 2 in Chemistry

Tell me about the race for first to the moon back in the 60's or whenever it was. i dont know much about it.

2007-01-28 12:06:48 · 4 answers · asked by Anonymous in Astronomy & Space

An automobile traveling 90 km/h overtakes a 1.30 km long train traveling in the same direction on a track parallel to the road.

Figure 2-40

If the train's speed is 75 km/h, how long does it take the car to pass it?
min
How far will the car have traveled in this time?
km
See Figure 2-40. What are the results if the car and train are traveling in opposite directions?
s
km

2007-01-28 12:06:33 · 2 answers · asked by nafiseh g 1 in Mathematics

2007-01-28 12:05:26 · 2 answers · asked by ashnadpersaud 1 in Chemistry

conversion chart:
2.54 cm= 1 inch.
1 liter= 0.264 gallon
1 cm^3= 1 millililter
1000 milliliter= 1 liter

2007-01-28 12:02:37 · 4 answers · asked by carmenclassof06 4 in Mathematics