Science & Mathematics - 1 November 2007

2007-11-01 06:54:42 · 1 answers · asked by jnester0289 1 in Chemistry

Given the definition of a powerful number (a number where, for every prime factor p, p^2 is also a factor), I would think all powerful numbers would be of the form m = (ab)^2 where a and b are integers and at least one is a prime number. However, every definition I have seen for powerful numbers states the form as m = (a^2)(b^3). Why?

2007-11-01 06:52:49 · 3 answers · asked by Winkerbean 2 in Mathematics

Question: How many legs are there in the bus?

You are looking for a number, not words! It's not a trick question...

Can you figure this one out...

- There are 7 girls on a bus

- Each girl has 7 backpacks

- In each backpack, there are 7 big cats

- For every big cat there are 7 little cats

How many legs are there in the bus?

2007-11-01 06:51:25 · 2 answers · asked by RC 1 in Mathematics

i need to know how to do it soon as possible

2007-11-01 06:49:25 · 6 answers · asked by Anonymous in Mathematics

Why is it that when a storm can possibly produce a tornado the sky and clouds turn green or green looking? what makes it do that?

2007-11-01 06:48:59 · 4 answers · asked by lrdnitecon 4 in Weather

in the fraction of glucose (C6H12O6) with oxygen (O2) to produce carbon dioxide (CO2) and (H2O), you need a ratio of molecules equal to: 1 glucose, 6 oxygen: 6 carbon dioxide: 6 water

-how many moles of oxygen would you need?
-how many moles of carbon dioxide and water would you produce
-how many grams of carbon dioxide and water would you produce?

please explain calculations. Sorry if this is too much to ask.

2007-11-01 06:48:33 · 1 answers · asked by the common cold 4 in Chemistry

2007-11-01 06:48:15 · 23 answers · asked by Puma (Juan) 2 in Astronomy & Space

please help me. i don't understand this at all.

a sample of nickle has 2.5 times the mass of a sample of calcium with 203 x 10^23 molecules. what is the mass of the nickle?

atomic mass of nickle: 58.6934
calcium: 40.078

avagadro's number: 6.022 x 10^23

2007-11-01 06:41:35 · 4 answers · asked by the common cold 4 in Chemistry

Does anyone can tell me an answer? I cannot solve it!

2007-11-01 06:41:24 · 6 answers · asked by Anonymous in Mathematics

z=(3+i)^3
I can't find any examples of this variety of problem in this format, where the second number is an irrational/complex number. Can anyone explain the steps in solving a problem like this please?

2007-11-01 06:41:08 · 3 answers · asked by Anonymous in Mathematics

I realize it goes out to sea , but how far ?

Does it form sandbars relatively close to shore ?

Or does it go to the very depths of the ocean ?

2007-11-01 06:40:47 · 8 answers · asked by Anonymous in Earth Sciences & Geology

y=-4y
3x+2y=20

2007-11-01 06:40:42 · 7 answers · asked by butterflt 1 in Mathematics

We now 3 dimensions right? I heard on TV that there could be up to 18 more, plz enlighten me of what they could be

2007-11-01 06:38:18 · 4 answers · asked by Anonymous in Physics

maths

2007-11-01 06:34:42 · 5 answers · asked by Anonymous in Mathematics

i need to do an essay

2007-11-01 06:33:09 · 1 answers · asked by greg_mrcs 1 in Physics

1. What is the equation for the parabola whose vertex is (3,-6) and focus is (4,-6)?

2007-11-01 06:31:37 · 1 answers · asked by Anonymous in Mathematics

Please give me answers in ways it possibly can be destroyed.

2007-11-01 06:30:00 · 6 answers · asked by Anonymous in Physics

Heres what I said
2sinxcosx=sin2x isn't that a rule?
then y=sin2x
then the derivative of that is
2cos2x
right
or do u have to do it as a product?

2007-11-01 06:24:22 · 5 answers · asked by limallama 4 in Mathematics

I'm going in to have my wisdom teeth removed,they are soooo pesky. I'm gonna be a little groggy from the anesthesia, so how much should tip? I wanna have it ready when i get there so I don't have to count it. And should I give it to him before, or let my dad give it to him right after?

2007-11-01 06:22:04 · 21 answers · asked by Anonymous in Medicine

2007-11-01 06:22:02 · 3 answers · asked by Anonymous in Engineering

1) Why is water a versitle solvent?
2) What maerials will not disolve in water
3) Why does water have a specific heat
4) Why does water have a relativly high heat of vaporization?
5) What is the biological importance of water's high heat of vaporization?
6) At equilibrium in pure water 25 degrees celcius:
a)how does the (H+) compare to the (OH)?
b)what s the (H+)

2007-11-01 06:20:39 · 4 answers · asked by Anonymous in Chemistry

I am considering taking a college geometry course. I am a little concerned because I haven't had very much high school geometry(probably 2 months worth). I wanted to know if anyone has taken college geometry and whta their thought on it are? Would someone like me be able to handle it?

2007-11-01 06:20:10 · 3 answers · asked by aba 2 in Mathematics

a. How many atoms are present if the substance is lead metal, Pb?

b. How many molecules are present if the substance is sucrose, C12H22O11?

c. How many formula units are present if the substance is calcium carbonate, CaCO3?



This is a question I have to turn in tommorow at school. I've looked in my book, but it doesn't explain how I answer this question. Please help! I'll choose the best answer quickly, I promise!

2007-11-01 06:16:41 · 2 answers · asked by Anonymous in Chemistry

I am writing a lesson on the unit circle and I understand its various properties concerning the trigonometric functions (ie. the sin of an angle is equal to the y coordinate of the point at which the terminal side of the angle intersects with the circle). However what other unique features does the unit circle exhibit? How else can it be used in a lesson? Where is the usefullness of the unit circle applied in practical applications?
Thank You for all your help in advance!

2007-11-01 06:15:48 · 2 answers · asked by Joseph P 4 in Mathematics

What would be you're expected success rate? Would it be something other than 1 in 3?

2007-11-01 06:13:16 · 9 answers · asked by Justin H 7 in Mathematics

Click the link to see the question and the multiple choice answers. First person to answer with the right answer will get 5 stars?





http://tinypic.com/view.php?pic=6b9pnck&s=1

2007-11-01 06:10:02 · 1 answers · asked by Anonymous in Mathematics

We're supposed to find how many moles and atoms/molecules in each compound/element. I am almost completely lost... I know theres something to do with taking the mass and dividing it by the formula weight and multiplying it by 6.02 x 10^23, but i don't know if that's just for moles or if its molecules/atoms... or both? I'm about to rip my hair out Can someone PLEASE PLEASE PLEASE help? (i.e. Calcium Chloride, CaCl2 2H2O, 14.439 g of it.)

2007-11-01 06:08:10 · 3 answers · asked by NoID 2 in Chemistry

There is 36.50 cm cubed of liquid. Which apparatus is the most accurate to measure its volume: A burette or a pipette

2007-11-01 06:02:14 · 6 answers · asked by kewl_something 1 in Chemistry

Let x equal the # of them who score perfect on sat.
What is p(x) for x =0,1,2,3?

2007-11-01 06:01:25 · 1 answers · asked by Anonymous in Mathematics

2007-11-01 05:59:09 · 6 answers · asked by vegesna 1 in Astronomy & Space