Science & Mathematics - 31 July 2007

I have noticed alot of photos of my male relatives young and old, and now that they are old their temple regions (above ear and near eyes) have gotten wider a bit. Basically there faces look more mature and older. Is this widening process possible. And non of them are bald, so it can't be because of baldness. They still have all the hair they had in their 20's still in their 40's. So can the skull change dimension as we age to give a slightly different and more mature look?

2007-07-31 13:26:11 · 2 answers · asked by easy s 1 in Other - Science

The density of pure aluminium calculated from crystallographic data is expected to be 2.6995g/cm³. (can consider density only)

Design an aluminium alloy that has a density of 2.6450g/cm³

and antoher aluminium alloy that has density of 2.7450g/cm³

I'm sort of lost with this question, if someone can help me with the first one and maybe put me on the right track with some formulas or links or what ever. Am i going to have to use trial and error or is there an exact way to do this. Any idea;s would be great!

2007-07-31 13:24:02 · 2 answers · asked by chinsta... 2 in Chemistry

i am 16 and i live in somerset nj i want to do a cpr training program so i can do emt.

how long is the course of emt and how does it help?

for me to do emt i need a cpr course done but i dont know where to do it. they have it at robert wood johnson hospital new brunswick nj but i cant find the form online.

if someone can find it it would be nice.

any other information of emt/cpr for teens is needed.

thanks!!!!

2007-07-31 13:20:20 · 2 answers · asked by Kesha 1 in Medicine

2007-07-31 13:16:23 · 8 answers · asked by Anonymous in Biology

A 2.0kg mass is traveling at 5.0 m/s on a smooth horizontal surface when it collides with and sticks to a stationary 6.0 kg mass. The larger mass is attached to a light spring of force constant 150 N/m. Find (a) the amplitude of the resulting oscillations of this system (b) the frequency and (c) the period of the oscillations.

This is the exact question that I have, there was no drawing formulas or other info provide to answer this question. Please help I need to know how to answer this question because it will be on a Exam.

2007-07-31 13:09:37 · 3 answers · asked by ~~052702~~ 3 in Physics

a^2 - 64 = 0

2007-07-31 13:04:56 · 11 answers · asked by Anonymous in Mathematics

So when you want to graph something on this calculator you have to put in the equation, then press graph, but when I press it, it says "ERR: INVALID DIM"

2007-07-31 12:59:35 · 4 answers · asked by Anonymous in Mathematics

2007-07-31 12:36:05 · 2 answers · asked by BenL 2 in Chemistry

I would think that a search for meaning (ie. how human consciousness relates to the Universe as a whole) and ideas relating to a unified theory would apply to all and thus negating political, cultural, economic, and gender differences. When females do appear in the sciences, they are examples of extremely intelligent, highly motivated, and intensely focused individuals (ie. exceptional acheivers of scientific endeavor) while it appears that any mediocre male can get a backstage pass to the cosmic theatre. Is this gender bias ingrained at a young age? I don't remember an astronaut Barbie ever been issued. Perhaps it is taboo or shameful for a young woman to have interests in the very big or very small. Energy in all of its tranformations and manifestations should apply to man and woman alike.

2007-07-31 12:35:35 · 13 answers · asked by darrr 1 in Astronomy & Space

Biology, biosphere, global warming

2007-07-31 12:35:19 · 4 answers · asked by Gangi S 2 in Weather

What is the hydroxide ion concentration in an aqueous solution if the hydronium ion concentration is 1 x 10^-5 mole per liter? What is the pH of the solution?

Any help would be greatly appreciated

2007-07-31 12:32:15 · 5 answers · asked by Michael S 1 in Chemistry

2007-07-31 12:25:19 · 3 answers · asked by BenL 2 in Physics

I am in charge of reporting the level of certain minerals as well oil and grease in the wastewater of one of the shops my employer owns. I also have to report the PH. level. It has to be between 6 and 9. Why?

2007-07-31 12:21:46 · 5 answers · asked by Laura R 2 in Other - Science

My son asked this question. What would happen if 2 hurricanes collided? Let out that it probably couldn't happen and work in the hypothetical.

2007-07-31 12:20:06 · 3 answers · asked by Mr. Cellophane 6 in Weather

2007-07-31 12:19:54 · 11 answers · asked by Link 5 in Physics

How many atoms are there in 56 grams of Nitrogen?

2007-07-31 12:11:28 · 2 answers · asked by zade 1 in Chemistry

I drove into something and this morning I found my tire had a hole and it was all mushy. Was this an acid or what? Or did I piss off an alien?

2007-07-31 12:10:54 · 3 answers · asked by Anonymous in Chemistry

2007-07-31 12:07:55 · 3 answers · asked by beachbummer26 1 in Earth Sciences & Geology

Just curious. : )

2007-07-31 11:58:55 · 9 answers · asked by Lexi L. 2 in Other - Science

2007-07-31 11:49:55 · 16 answers · asked by rigo 1 in Astronomy & Space

how do you change pounds into stone???

2007-07-31 11:48:54 · 5 answers · asked by Anonymous in Mathematics

OK. So the earth is a perfect sphere and there are no issues with molten heat and such - this is all taken care of with very good insulation.

There is an open tube extending through the earth from the North Pole to the South Pole. Since the tube is through the axis of rotation - we can ignore any corriolis/centripital effects.

You drop an apple - or a billiard ball - into the tube - straight down so that it does not touch the sides - so we can dispense with any friction issues. And the tube is maintained at a vacuum - so we can dispense with any air resistance issues.

So, now that we have that down - we drop the ball into the tube - what happens? How does the ball behave as it falls toward the center of the earth, past the center of the earth, and beyond the center of the earth? How would it behave if we took air resistance into effect?

Enjoy!!!

2007-07-31 11:45:31 · 10 answers · asked by Anonymous in Physics

I know Pluto isn't a planet,but what is it?

2007-07-31 11:40:42 · 29 answers · asked by Lexi L. 2 in Astronomy & Space

2007-07-31 11:40:35 · 2 answers · asked by will 1 in Weather

moles reacted in the reaction Zn + CuSO4 *5H2O

i don't really know which info to use, so here's all of it!

total amount of heat produced: 4.37x10^3 kj

undissolved metal: 0.10 mol. heat absorbed by undissolved metal: 24.75 kj
change in temperature: 9.9 degrees Celcius.

How do i do this? Do i need more information?

2007-07-31 11:37:27 · 1 answers · asked by Anonymous in Chemistry

I used formula a/b - c/d = (a-c)/(b+d):
8/6 - 2/3 = (8-2)/(6+3) = 6/9,
but the book says the answer is 2/3.
What did I do wrong?

2007-07-31 11:30:46 · 11 answers · asked by Alexander 6 in Mathematics

2007-07-31 11:28:59 · 2 answers · asked by Melanie B 1 in Weather

2007-07-31 11:26:47 · 7 answers · asked by BenL 2 in Mathematics

As I understand it, matter and energy can't be created or destroyed, only transferred or dissipated. So what scientific theory explains the origin of matter?

2007-07-31 11:15:27 · 13 answers · asked by Anonymous in Astronomy & Space

I have a nest in my roof of insects that reminds me of yellow jackets, but are larger. They have two back legs that hang much lower than other bees/jackets. (Almost like a wasp) Black and yellow markings. Can anyone help and provide a picture/web link for me to verify? Thanks!

2007-07-31 11:10:59 · 12 answers · asked by stardust12081 3 in Zoology