Science & Mathematics - 15 October 2007

2007-10-15 16:22:41 · 4 answers · asked by Terri L 2 in Biology

We have to write our own procedure for how to identify an unknown hydrated salt, but I have no clue how. HELP!!!!!!!

2007-10-15 16:20:08 · 1 answers · asked by Adz 2 in Chemistry

We had a Nomenclature WS in chemistry today converting the name to the chemical formula, simple stuff, and I'm just wondering if someone will Check some of my answers. Best answer goes to the one who gets the most right when i get my paper back. Thank you! :
1)magnesium oxide my answer: Mg20
2)calcium nitride my answer: Ca2N3
3)potassium iodide my answer: KI(capital i)
4)strontium chloride my answer: Sr2Cl
5)aluminum nitride my answer: AlN

2007-10-15 16:17:32 · 4 answers · asked by RLB 2 in Chemistry

What is the equation to get the sum of the first "n" powers of 2?

2007-10-15 16:16:55 · 1 answers · asked by Nesting 2 in Mathematics

At a price of $p the demand x per month (in multiples of 100) for a new piece of software is given by x^2 + 2xp + 7p^2 = 1000.

Because of its popularity, the manufacturer is increasing the price at a rate of 20 cents per month. Find the corresponding rate of decrease in demand for the software when the software costs $10.

I am pretty sure the x variable is 10, like p. I used the quadratic formula to get this. I think i'm confusing some step in the middle where you need to use the product rule.

2007-10-15 16:14:27 · 2 answers · asked by wicky034 2 in Mathematics

Help with math problem?..?
Complete the table and find the balance. A if $3500 is invested at an annual percentage rate of 3% for 10 years and compounded n times a year.
n=1,2,4,12,365
A=
*SO, the formula I think is A=p(1+r/n)nt

$3500 (1+.03-12) to the power of 10*12?...

2007-10-15 16:12:27 · 1 answers · asked by Cherryberry 1 in Mathematics

100 x N =50

2007-10-15 16:07:24 · 6 answers · asked by ANGELEYEZZ 1 in Mathematics

2007-10-15 16:04:58 · 2 answers · asked by ? 3 in Biology

I LUV U!

2007-10-15 15:59:39 · 4 answers · asked by Anonymous in Geography

2007-10-15 15:59:28 · 17 answers · asked by Anonymous in Weather

Which of the following statements about the days experienced by imaginary observers living on Uranus is FALSE?

a) Observers near one of the poles could experience continuous darkness for about 40 Earth years.

b) For observers at moderate latitudes, the Sun rises and sets about every 17 hrs throughout the year.

C) The Sun can sometimes move in a circumpolar fashion for observers quite far from the pole.

d) Observers on the equator would see the Sun pass through their zenith twice every Uranian year.

e) The duration of daylight for near equatorial observers varies enormously at different times of the Uranian year.

2007-10-15 15:59:27 · 3 answers · asked by jason y 2 in Astronomy & Space

what if there were no sources to help u? (like the internet)

2007-10-15 15:56:16 · 6 answers · asked by Anonymous in Physics

If you are in a pool and all of a sudden you see this really hot girl and you get hard. Would the pool level rise or not? THINK ABOUT IT!

2007-10-15 15:56:02 · 13 answers · asked by Kavin 2 in Biology

Vector A points in the negative y direction and has a magnitude of 7 units. Vector B has twice the magnitude and points in the positive x direction. Find the direction and magnitude of the following vectors.

(a) A + B
___________
___________ ° (counterclockwise from the +x-axis)

(b) A - B
_________
_________° (counterclockwise from the +x-axis)

(c) B - A
___________
___________° (counterclockwise from the +x-axis)

2007-10-15 15:55:42 · 1 answers · asked by shamsan_415 1 in Physics

Does any one know the difference between a relief globe and the earth? What is a relief globe? Thank you :)

2007-10-15 15:53:09 · 1 answers · asked by athletegirl08 1 in Earth Sciences & Geology

2007-10-15 15:50:53 · 13 answers · asked by Alan B 1 in Mathematics

HELP HOW DO WE DO THIS??

2007-10-15 15:48:42 · 1 answers · asked by ANGELEYEZZ 1 in Mathematics

2007-10-15 15:45:50 · 3 answers · asked by Rob 1 in Mathematics

Does anyone know when the best time to see Saturn is with a not-so-expensive telescope? I'm in Jacksonville, FL.

Thanks!

2007-10-15 15:43:57 · 4 answers · asked by Boomer 5 in Astronomy & Space

please help

2007-10-15 15:42:53 · 7 answers · asked by hunedip22 1 in Mathematics

whats the answer to this?

2007-10-15 15:36:52 · 10 answers · asked by Billy H 1 in Mathematics

i knwo this is a simple question but for some reason i cant get my head around it..grrr

a ten kilogram block of metal measuring 12 cm x 10cm x10cm is suspened from a scale and immersed in water. the 12 cm dimension is vertical and the top of the block is 5 cm bekiw the surface of the water.
a)what are the forces acting on the top and bottom of the block? (use po of 1.0130x10^5N/m^2

b)what is the reading of the spring scale?

c)show that the buoyant force equals the difference between the forces at the top and the bottom of hte block.

thanx for ur help

2007-10-15 15:35:22 · 2 answers · asked by two_quic 1 in Physics

What is the scientific notation?! Also, please solve this problem if you can:
Write the number in scientific notation:
643,000

2007-10-15 15:33:59 · 5 answers · asked by HanaHope 2 in Mathematics

2007-10-15 15:33:36 · 7 answers · asked by curious 1 in Medicine

A superball of mass m is dropped vertically from a height, h. If the impact time with the floor is {delta}t, what is the average force on the ball? (Assume that the superball bounces back to the same height.)

I think the answer is :

(m*(gh)^0.5)/(2*{delta}t)

is this right? if not, what part is wrong?

2007-10-15 15:32:23 · 1 answers · asked by beer drinkers 2 in Physics

When 4.47 g of compound A (molar mass = 120.0 g) reacts with a few grams of compound B (molar mass unknown), 6.21 g of product C is produced. Analysis shows that C is actually a simple addition compound (that is, AB) and that the yield of product was 84.1% based on A. If A is the limiting reagent, what is the least amount of B that must be used to prepare the maximum amount of C obtainable from 4.47 g of compound A?

2007-10-15 15:29:44 · 2 answers · asked by Anonymous in Chemistry

reconstruct a sequence of events?
I need help please!

2007-10-15 15:28:46 · 1 answers · asked by AlyThePunk 1 in Earth Sciences & Geology

2007-10-15 15:28:12 · 1 answers · asked by lisa 1 in Chemistry

2007-10-15 15:28:11 · 4 answers · asked by Nirav P 1 in Earth Sciences & Geology

I just got a new telescope and I can't see anything out of them!
Also I never used one before!
I tried to see the stars today, but all I can see is a blurr.
The type of telescope I got is:
Edu Science
Astrolon Telescope
525 Power
Includes: 4mm, 9mm, 12.5mm, and 20mm eye piece.
1x and 3x Barlow lens
Red dot finder (I don't know what that is at all!)
Is this a bad telescope I got?
If it is bad, which telescope is good to use?
I really hope somebody has an answer to this question..
Thank You !

2007-10-15 15:27:22 · 14 answers · asked by lena(: 2 in Astronomy & Space