Science & Mathematics - 20 September 2006

2006-09-20 14:37:14 · 20 answers · asked by Linda M 1 in Geography

I had a lab where we heated sand in a testube on an alcohol burner and after it cooled we put water in it and it became hot. Why does this happen? What's in the sand that causes it?

2006-09-20 14:34:54 · 3 answers · asked by kitsuby 1 in Earth Sciences & Geology

2006-09-20 14:33:10 · 4 answers · asked by Anonymous in Mathematics

2006-09-20 14:31:34 · 13 answers · asked by graciousghazal 1 in Astronomy & Space

2006-09-20 14:29:13 · 7 answers · asked by elise-marie 1 in Biology

A father and son eat meals together. If the son eats twice as fast as the father and the father eats a meal in 45 minutes, how many meals can the son eatin 3 hours?

2006-09-20 14:28:45 · 12 answers · asked by Sasha 2 in Mathematics

2006-09-20 14:26:36 · 9 answers · asked by Anonymous in Chemistry

microbiology

2006-09-20 14:25:34 · 2 answers · asked by Katrina 1 in Biology

No idea even how to start this

2006-09-20 14:25:03 · 1 answers · asked by Adam B 1 in Mathematics

I need to focus on an animal thats interesting or exotic; it would be helpful if it had qqualities that help humans (for arguing for its survival). There are so many!

2006-09-20 14:23:42 · 10 answers · asked by ChaChaChingThing 2 in Biology

2006-09-20 14:22:35 · 11 answers · asked by Anonymous in Engineering

2006-09-20 14:21:24 · 6 answers · asked by yunzi0612 2 in Chemistry

I just learning about this stuff so I need some help please.

Given f(x) = x^2 and x>0 then prove

f[SQRT(x) + SQRT(f(x))]
/ (aka divided by)
f(x+1) - f(x-1)

is a constant. (I think this means it does not depend on x.

An explaination would be very helpful, thank you very much.

2006-09-20 14:21:12 · 2 answers · asked by Ms. Curiosity 1 in Mathematics

what is the relationship among cells,tissue,and organs

2006-09-20 14:17:52 · 6 answers · asked by Anonymous in Biology

2006-09-20 14:16:36 · 6 answers · asked by Anonymous in Botany

I did a science lab where we took a constant velocity car and recorded its position every two seconds. I did the experiment in two parts of data, one going in a positive direction and the other in negative.

How do I determine the relationship between its position and its time?

2006-09-20 14:15:55 · 6 answers · asked by Anonymous in Physics

2006-09-20 14:13:22 · 13 answers · asked by Bob Bob2 1 in Physics

which 2 element do not exist by themselves in nature?

2006-09-20 14:07:58 · 7 answers · asked by Anonymous in Biology

2006-09-20 14:07:47 · 5 answers · asked by Anonymous in Botany

No further details needed ..

2006-09-20 14:07:15 · 13 answers · asked by David A 1 in Astronomy & Space

Ok, this might seem easy...but I really need the answer fast!!!

what is the limit of f(x) as x approaches 0 of sin^3(2X)/(X^3)?

2006-09-20 14:05:16 · 6 answers · asked by Aurora 1 in Mathematics

It is important to health and homeostasis.

2006-09-20 14:04:07 · 2 answers · asked by Art 3 in Biology

In my calculous class this equation was presented to the calss:
x*x = x + x + x + ... + x (x times)
d/dx (x*x) = d/dx ( x + x + x + ... + x )
d/dx (x*x) = d/dx (x) + d/dx (x) + ... d/dx (x)
2x = 1 + 1 + ... + 1
2x = x
2 = 1

I do not understand why this works. If possible coul you pleasse explain why it works. In addition to why it techiquenly does not.

2006-09-20 14:03:06 · 10 answers · asked by firerosethorn 1 in Mathematics

2006-09-20 13:55:19 · 12 answers · asked by Nessa 1 in Physics

2006-09-20 13:54:47 · 6 answers · asked by Nessa 1 in Physics

if you can cut 6 cards from an 8 1/2 x 11 sheet of paper, how many sheets of that paper will be required to fill an order for 2000 cards?

2006-09-20 13:54:13 · 7 answers · asked by Anonymous in Mathematics

2006-09-20 13:52:29 · 5 answers · asked by Anonymous in Mathematics

How long does it takes for the population to go down to 500 million.
Assume
Current population -1500 million
birthrate-13.14 births / 1,000 population
Death rate:
6.94 deaths / 1,000 population
I not sure if I provide sufficient information.

2006-09-20 13:51:57 · 6 answers · asked by joy_chia 1 in Mathematics

Just asking

2006-09-20 13:51:26 · 7 answers · asked by Brianna... 3 in Other - Science

what are some characteristics of the endoplasmic reticulum

2006-09-20 13:50:21 · 7 answers · asked by fillojeta a 1 in Biology