Science & Mathematics - 22 September 2007

I'm doing a cell project for biology and I need some thing in california that I can say would be like a cell wall. I thought about the border but it's not really a wall, Is It?

2007-09-22 11:24:49 · 4 answers · asked by locachicablanca 1 in Biology

If a sample of the compound C 3H 2Cl 6 contains 21 moles of C atoms identify how many moles of Cl atoms it contains.

help plz.

2007-09-22 11:20:34 · 2 answers · asked by Anonymous in Chemistry

2007-09-22 11:19:51 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Ok, first off, this is for biology class...not chemistry...which is kind of weird to begin with (I thought it fit better in the chem category). I have to create a 3-D Bohr model of the atom carbon. One of the requirements is that protons, neutrons, and electrons are proportional. I thought that electrons were just a cloud/shells anyway, but I guess not according to this teacher...should I make the protons, neutrons, and electrons the same size, or different sizes? I have only seen them the same size...but I am only in high school...btw, this teacher is really...*cough* annoying, unreliable, confusing, dyslexic (no offense...) *cough* so I have trouble with her instructions sometimes...if they are the same size, please just say so. If not, say what sizes they should be, please! Thanks. (Sorry about the lengthy details.)

2007-09-22 11:19:27 · 6 answers · asked by mlygsby 3 in Chemistry

√25
------ the whole problem is under the square root
128




2√20+ 8√45 - √80

(how would i combine and simplify this.)

and
(3√y)^2

2007-09-22 11:17:31 · 1 answers · asked by yoshi_gurl08 1 in Mathematics

The gravitational potentials due to the spherical mass are all negative values. However, when the spherical mass is electrically charged, explain why the electrical potentials can be positive values with reference to the defintition of potentials.

2007-09-22 11:15:46 · 4 answers · asked by Anonymous in Physics

please help, i am so lost on this lab I am doing.

2007-09-22 11:13:37 · 2 answers · asked by chemistryishard 2 in Chemistry

2007-09-22 11:08:11 · 4 answers · asked by Anonymous in Mathematics

Ok I posted a question on whether or not people had seen that pink dolphin. I remarked that I hoped SeaWorld would not try to capture the youngster and make him do tricks. And I got a reply that I should not stereotype Sea World, and that they did not capture Dolphins but had breeding programs. So I added that I stood corrected.
But then I got curious and googled Orcas and found two really great websites.
orcanetwork.org/news
and worldanimalfoundation.com
Sea World with holds food to force the animals to perform, they also isolate them.
Male orcas live between 50 and sixty years, and female orcas live between 80 and 90 years. the ones at sea world rarely survive to age 11 years. Then I read the Killing Tanks by Gary Hanauere.
It seems two orcas became so stressed that they repeatedly dragged trainer Jonathan Smith to the bottom of the tank in an apparent attempt to drown him.
Then I read about Lolita, an orca that people are trying to free.
So is Lolita free now.

2007-09-22 11:04:35 · 4 answers · asked by Anne2 7 in Zoology

A certain ball has the property that each time it falls from a height 'h' onto a hard, level surface, it rebounds to a height 'rh', where 0 < r < 1. Suppose that the ball is dropped from an initial height of 'H' meters.

a) Assuming that the ball continues to bounce indefinitely, find the total distance that it travels. (Use the fact that the ball falls 1/2gt^2 meters in 't' seconds)

b) calculate the total time that the ball travels.

c) suppose that each time the ball strikes the surface with velocity 'v' it rebounds with velocity '-kv', where 0 < k < 1. How long will it take for the ball to come to rest?

explanation/steps plz..thanks :)

2007-09-22 11:00:38 · 1 answers · asked by Anonymous in Mathematics

The molecular formula for the compound CH 3COOH indicates there is a 1:3 molar ratio between the compound and the hydrogen atoms in that compound.

is it true or false?

help plz?

2007-09-22 10:57:39 · 4 answers · asked by Anonymous in Chemistry

i need to figure out which environment they thrive in.

2007-09-22 10:56:14 · 3 answers · asked by :] 2 in Botany

Does T in the equations means time?

2007-09-22 10:50:24 · 7 answers · asked by Anonymous in Mathematics

2007-09-22 10:50:20 · 5 answers · asked by Anonymous in Mathematics

Q: C6H5-NH2 + C6H5-OH <-----> C6H5-NH3(+) + C6H5-O(-)

pka of C6H5-OH = 10
pka of C6H5-NH3(+) = 4.6

A: I have determined that the answer is No (a reaction will not take place).. However, I have no clue why...Can someone explain it to me. Thanks!

2007-09-22 10:47:44 · 1 answers · asked by Jimmy 3 in Chemistry

which organic compound would you most likely need more of: carbohydrate, nucleic acid, lipid, protein

a: dry and brittle hair: my guess protein
b: tired all the time: carbs? proteins?
c: fingernails break and are soft: proteins?
d: cold easily: protein?
e: body growing rapidly: don't know

there can be more than one answer for each of the situations
please tell me if im right thanks

2007-09-22 10:47:14 · 2 answers · asked by Anonymous 2 in Biology

solve by elimination please

2007-09-22 10:44:13 · 7 answers · asked by Anonymous in Mathematics

2007-09-22 10:43:13 · 10 answers · asked by Anonymous in Engineering

I know that the half life of Carbon-14 is 5730 years,
but what would be the age of a fossil containing 1/16 the amount of Carbon-14?
Im puzzled...
any help would be appreciated

2007-09-22 10:42:47 · 1 answers · asked by Anonymous in Biology

Where in a molecule is energy stored?
How does your body get energy out of the food you eat? (Is it basically like your body breaks down the food into simpler molecules that it can use? I don't know of it that's right but my guess)
Why does living organisms release energy gradually?
Is it true that enzymes must be constantly synthesized by the body since they are used up in a reaction? (I thought that enzymes don't react so you don't need more right? I'm not sure. by the way what does synthesize mean?)
where in a cell would you look for dna?
what bases do dna and rna have in common
is dna or rna longer


thanks

2007-09-22 10:40:55 · 1 answers · asked by Anonymous 2 in Biology

i've never actually sucked the helium out of a balloon but my old science teacher told me that i've you take to much you could die

is that true?

2007-09-22 10:40:38 · 13 answers · asked by Anonymous in Other - Science

6
------
√2-√3

2007-09-22 10:39:39 · 8 answers · asked by hola_kity2008 1 in Mathematics

How do you wirte electonic configuration, how? method please for example NA, is 1s2 2s2 2p6 3s1 , (another think i dont get is 2s2)

2007-09-22 10:38:31 · 3 answers · asked by nothingspecial 1 in Chemistry

determine whether the series is convergent or divergent using either the integral test or the comparison test:

1) summation notation symbol (with n=1 on bottom and infinity on top) of (ne)^-n

2) summation notation symbol (with n=1 on bottom and infinity on top) of ((cos^2)n)/(n^2 + 1)

3) summation notation symbol (with n=1 on bottom and infinity on top) of 1/ sqrt of (n^2 + 1)

show work/explanation so i know how u got the answer..thanks

2007-09-22 10:35:47 · 1 answers · asked by Anonymous in Mathematics

So light travels at the speeds a few of you have given, thanks for that. So the fact is that we exist in present TIME but live in the PAST according to the speed of light. Everything we see is actually delayed by a fraction of time. Am I Right?

2007-09-22 10:35:25 · 19 answers · asked by susan j 1 in Astronomy & Space

What is the volume

2007-09-22 10:34:47 · 2 answers · asked by Anonymous in Mathematics

2007-09-22 10:31:56 · 1 answers · asked by Anonymous in Mathematics

1 )A jet plane is cruising at 300 m/s when suddenly the pilot turns the engines up to full throttle. After traveling 4.0 km, the jet is moving with a speed of 400 m/s. What is the jet's acceleration, assuming it to be a constant acceleration?

2)A plane accelerates from rest at a constant rate of 5.00 along a runway that is 1800 long. Assume that the plane reaches the required takeoff velocity at the end of the runway. What is the time needed to take off?

2007-09-22 10:31:52 · 4 answers · asked by Anonymous in Physics

decreasing according to the equation P = Qe^(-kt), where t represents time in hours. If 10% of the pollution is removed in the first five hours:
(a) What percentage of the pollution is left after 15 hours?
(b) How long will it take before the pollution is reduced to 10%?

2007-09-22 10:30:28 · 1 answers · asked by simonkf2002 1 in Physics

2007-09-22 10:29:11 · 3 answers · asked by Anonymous in Earth Sciences & Geology