Science & Mathematics - 24 July 2006

2006-07-24 16:43:15 · 5 answers · asked by Anonymous in Biology

2006-07-24 16:42:14 · 7 answers · asked by Anonymous in Geography

2006-07-24 16:41:05 · 3 answers · asked by fireblazer911 1 in Chemistry

2006-07-24 16:40:49 · 31 answers · asked by Anonymous in Mathematics

Find the dimensions of a rectangle with area 1000 m whos perimeter is as small as possible. I try 1000 = xy and p = 2(x+y) so 1000 = (x-p/2)(y-p/2). what am i doing wrong?

2006-07-24 16:40:16 · 3 answers · asked by Anonymous in Mathematics

2006-07-24 16:40:10 · 2 answers · asked by Anonymous in Mathematics

2006-07-24 16:39:52 · 8 answers · asked by Anonymous in Mathematics

for example: if you took the head of a pen and moved it exactly half distance to a piece of paper everytime you moved the pen, would that pen head eventually hit that paper?

2006-07-24 16:37:21 · 19 answers · asked by Jeffrey C 1 in Mathematics

Sometimes when I look at the sky I swear I can see us moving but I'm not sure if it's just the clouds that are moving or if it is the Earth... maybe both? Which is it?

2006-07-24 16:32:28 · 11 answers · asked by Anonymous in Astronomy & Space

2006-07-24 16:26:33 · 7 answers · asked by Anonymous in Astronomy & Space

The half-life of radioactive potassium is 1.3 billion years. If 10 grams is present now, how much will be present in 100 years? 1000 years?

2006-07-24 16:23:18 · 7 answers · asked by Monica S 2 in Mathematics

N (t) = 1000e0.01t. After how many hours will the population equal 1500? 2000?

Also, if Iodine 131 is a radioactive material that decays according to the function
A(t) = A0 e-0.0244t where A0 is the initial amount present and A is the amount present at the time t (in days).
a)What is the half-life of iodine 131?



b) Determine how long it takes for 100 grams of iodine 131 to decay to 10 grams.

I REALLY NEED HELP WITH LOGS. I don't understand them at all.

2006-07-24 16:22:37 · 2 answers · asked by Monica S 2 in Mathematics

Hey everyone!...I need to do a physics project relevant to physics on either kinematics, force and acceleration, work, energy, or momentum. I am thinking about doing it on something car-crash related, but I don't know what direction to take it in. If you can give me any ideas on where to take this idea, it would be much appreciated. If you have something different than my car-crashing idea that relates to at least one of these contents, it would be acceptable as well. Thank you!

2006-07-24 16:17:27 · 8 answers · asked by Sparkles 3 in Physics

2006-07-24 16:16:07 · 13 answers · asked by Ulrika E 1 in Weather

where 2 buy phenol??

2006-07-24 16:15:37 · 8 answers · asked by dick 2 in Chemistry

wat r the chemicals found in car batteries

2006-07-24 16:14:32 · 6 answers · asked by dick 2 in Chemistry

2006-07-24 16:14:31 · 3 answers · asked by Vector_The Positivism 2 in Biology

If acid deposition (rain, snow, fog) a problem for soil as it is for feshwater ecosystems.

2006-07-24 16:01:37 · 3 answers · asked by dadyslilgirl5377 2 in Biology

I'm stumped on these, I've been able to do some, but the exponent on the outside of the square root is really throwing me off, any help is greatly appriciated. I hope it's readable, typing it out online is rough :), I've included answers for the ones that I was able to work through, although not all of them are complete.

√ = Square Root
^ = Exponent
/ = Numerator/Demoninator

Simplify. Assume that variables can represent any real number.

1) ^3√-8 / x^12
A) -2 / x^3

2) ^5√x^7y^2

3) √25x^6 / 16y^2
A) 5x^3 / 4y

4) (^3√6x)(^3√2y)
A) 2√x/

5) ^5√x^6y^4 / ^5√x^2y^3

6) (^4√xy^2)(√xy)

7) ^5√a^3 / ^4√a^2

8) 7√2 - 3√2
A) 4√2

9) (3 + √x)(7 - 5√x)

10) (√-4)(√-81)
A) 18

11) √48
A) √4√8

12) √36a^2
A) 6a

13) √x^2 - 12x + 36
A) | x - 6 |

14) Rewrite using radical notation: (2ab)^4/5
A) (^5√2ab)^4

15) Rewrite using exponential notation: √6x^2y

16) f(x) = √12 - 3x, determine the domain of f.

17) f(x) = x^2, find f(2 + √6)

18) Rationalize the denominator: √6 / 5 - √5

2006-07-24 15:56:27 · 4 answers · asked by Kevin B 1 in Mathematics

pls explain further why?

2006-07-24 15:56:22 · 6 answers · asked by froigajudo 1 in Engineering

2006-07-24 15:55:39 · 9 answers · asked by dadyslilgirl5377 2 in Biology

I will study electrical engineering but I want to know if I can do a concentration in communications,power distribution,controls and robotics and software or if I have to concentrate only in one area???????????I have to take 9 electives class but I want to take 15,I can do that and finish later???????????

2006-07-24 15:52:31 · 3 answers · asked by The Apostle 2 in Engineering

2006-07-24 15:51:55 · 3 answers · asked by dadyslilgirl5377 2 in Biology

2006-07-24 15:51:33 · 10 answers · asked by tamah 3 in Biology

let x=y
then x*x=x*y (multiply both sides by y)
then x*x-y*y=x*y-y*y (subtract y*y from each side)
then (x-y)(x+y)=y(x-y) (factor)
then x+y=y (divide both sides by x-y )
then y+y=y (since x=y)
then 2y=y (add like terms)
then 2=1 (divide both sides by y)

2006-07-24 15:50:17 · 14 answers · asked by rst_ca 1 in Mathematics

2006-07-24 15:50:01 · 4 answers · asked by ace50421 2 in Other - Science

2006-07-24 15:49:10 · 6 answers · asked by dadyslilgirl5377 2 in Earth Sciences & Geology

Im studying for a college compass test and have been out of school for a while, i need to brush up on mathematics and writing. Any suggestions on lit to study or tutor sites ecspecially for algebra

2006-07-24 15:48:52 · 6 answers · asked by jnnfr_dnns 1 in Mathematics

I like Spring the best.
Summer has been too hot this year.

2006-07-24 15:47:07 · 19 answers · asked by MaryBeth 7 in Weather

2006-07-24 15:47:06 · 7 answers · asked by Anonymous in Mathematics