Science & Mathematics - 25 July 2007

I was wondering why humans were shorter hundreds of years ago. And why homes were built with shorter ceilings

2007-07-25 13:12:36 · 8 answers · asked by Anonymous in Biology

bacteria
human tissue
viruses
they are all equally resistant to damage

2007-07-25 13:11:12 · 2 answers · asked by Anonymous in Medicine

I hate graphing parabolas, the teacher didnt show me how. I screwed up in Algebra 1 in the school and now in summerschool I am. please show me how in detailed steps and be bery clear... thanks.

2007-07-25 13:08:13 · 6 answers · asked by Poseidon 2 in Mathematics

I've seen some videos about 2012 and how certain people think that the world will end with Tsunamis on each coast of the world, Hurricanes, Comets, Tornadoes, Earthquakes and such but I dont know if its true. What do you think about 2012?



These are some of the videos i watched
http://www.youtube.com/watch?v=O96ZMPXuv1A

http://www.youtube.com/watch?v=Sxfs1iEg144&mode=related&search=

2007-07-25 13:05:28 · 9 answers · asked by Anonymous in Astronomy & Space

curie
rad
rem
roentgen

2007-07-25 13:03:35 · 3 answers · asked by Anonymous in Chemistry

Solve the system by addition or substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent.
10x + 2y = 7
y = -5x + 3

What!

2007-07-25 13:02:40 · 5 answers · asked by busy me 2 in Mathematics

2007-07-25 12:58:56 · 5 answers · asked by Anonymous in Botany

How do you find the cube root of any number without using a calculator or any electronics (with pencil/paper)?

Please show steps =D

2007-07-25 12:51:36 · 5 answers · asked by Anonymous in Mathematics

2007-07-25 12:49:40 · 8 answers · asked by Donna H 1 in Astronomy & Space

if compared the brain to a computers technicality, what would it be and assuming it did exist who many hours of manpower would it be needed to program such machine to do everything a brain does for a person in his/hers lifetime?
is it possible to calculate the answers?

2007-07-25 12:49:12 · 5 answers · asked by memuro 1 in Physics

Solve the following proportion for w:

-12/w=-15/w-1


Thank you in advance!

2007-07-25 12:48:39 · 5 answers · asked by Anonymous in Mathematics

2007-07-25 12:48:18 · 4 answers · asked by james b 1 in Botany

2007-07-25 12:47:28 · 7 answers · asked by Anonymous in Engineering

I recently read that gravity is the weakestforce in the universe in Neil Degrasse Tyson's book " just visiting this planet" .

That astounded me ! I thought it was the strongest !! So if that's not the strongest force what is?

Is there a scale of forces?

wow astronomy is so awesome!

2007-07-25 12:46:48 · 6 answers · asked by Anonymous in Astronomy & Space

What is the pH of a 1.00 x 10–9 molar solution of HCl?


9
5
6
6.8
7


And its not 9 or 5. Please list how this is solved. Thanks.

2007-07-25 12:43:11 · 5 answers · asked by Anonymous in Chemistry

2007-07-25 12:42:53 · 7 answers · asked by peaches 1 in Mathematics

Some one on here gave this answer :
every time we launch a satellite into orbit the mass of the Earth decreases.

Is that true? if so how ?
what would make it lose mass?

sounds fishy to me so I thought I'd check it out.

2007-07-25 12:40:56 · 7 answers · asked by Anonymous in Astronomy & Space

This one has lost me

2007-07-25 12:40:35 · 3 answers · asked by abercrombi_4_me 1 in Mathematics

2007-07-25 12:38:30 · 7 answers · asked by Anonymous in Mathematics

Something about a^3 + b^3 factors into something else...

2007-07-25 12:35:26 · 6 answers · asked by Like Woah 3 in Mathematics

I need to think of some really good ideas for this years math fair project. If you give me any ideas make sure it is something that can be explained. Any help anyone can give me will be thanked. And if i win with one of your answers i will make sure you know aboout it through Yahoo. Thanks for any answers givin.
Lilveedubgirl

2007-07-25 12:32:58 · 7 answers · asked by Andrea B 2 in Mathematics

I heard a guy in my astronomy class say .. if a star is 100 times the distance , it takes 100 years for that stars light to reach us .

did I get it right ?
.. I want to learn that , what's that called and how do you go about figuring it out?

It's so KEWL !!

2007-07-25 12:31:56 · 9 answers · asked by Anonymous in Astronomy & Space

what are the results (PH acid is used in most soft drinks)

2007-07-25 12:30:07 · 4 answers · asked by Anonymous in Chemistry

2007-07-25 12:28:19 · 9 answers · asked by peaches 1 in Mathematics

I personally think that this bear would mop the floor with any large constrictor that exists on the planet. But some nut cases in youtube are trying to say that a python or anaconda could kill a Kodiak Bear. I totally disagree! Large mammals like Tigers and Bears would pose a serious problem in the way of leverage for the snake. 90 psi or crushing force does the snake no good if it cannot coil around its victim. And it is impossible for it to coil around a large Bear or Tiger. They are not gonna simply sit there and allow the snake to throw coils around it. A bear would cut the snake into peices. A large Tiger would be able to bite the snake in half or cause some serious wounds that would force the snake to retreat. Tigers kill and eat large pythons all the time. No Python has ever killed a fully grown tiger. A cub was documented but never an adult. Whats with all these snake myths?

2007-07-25 12:26:37 · 2 answers · asked by Anonymous in Zoology

x - 1
------ ≥ 0
x + 2

Thanks...and the greater than or equal to symbol code is
& g e ;
with no spaces.

2007-07-25 12:23:53 · 2 answers · asked by jaz 5 in Mathematics

Ok, i know this is kinda a dumb question, but what is the purpose of water towers? do they actually hold water? if so, y do they have to be in the air? if they don't hold water, then what is in them? yes, this is a random and stupid question, but i've always wondered.

2007-07-25 12:21:42 · 6 answers · asked by southerngirldalejrfan 2 in Other - Science

Can someone show me how to find the integral of:
sin(sqrt(x)) dx.
Thanks!

2007-07-25 12:21:37 · 3 answers · asked by Anonymous in Mathematics

Factor the quadratic expression:

w^2 + 8w +16

Thanks for the help!!

2007-07-25 12:21:30 · 8 answers · asked by Anonymous in Mathematics

I am currently doing limiting reagent and excess part of it, and i have trouble, with calculating here is the question

N2 + 3H2 ---> 2NH3
How many grams of NH3 can be produced from the reaction of 28g N2 and 25g of H2?

I did 25g divide 2g = 12.5mols then divide by 3= 4.17mols
28g divide by 28g = 1 mol then divde by 1= 1 mol
so 1 mol is limiting and the 4.17 is excess
i use 1 mol times 2NH3 divide by 1 N2 = 2 mols x 17g = 34g of NH3
then the second part asks How much of the excess reagent in problem 1 is left over?
im assuming thats the 4.17mols, and i cannot find how to figure it out, becuase my answers does not match the answer on back of book..so please someone help, thanks

2007-07-25 12:17:41 · 2 answers · asked by playpwnsu 2 in Chemistry