Science & Mathematics - 30 December 2007

its for my science project

2007-12-30 07:43:37 · 1 answers · asked by Anonymous in Engineering

2007-12-30 07:40:21 · 10 answers · asked by carla 4 in Mathematics

what formula do i use and how do i do it?

y=x^2-8x+7

2007-12-30 07:36:23 · 10 answers · asked by Anonymous in Mathematics

Okay this is my math extra credit and please no stupid answers like I don't want to do your homework or I will report you.
Okay 10 points to the best answer lets begin!
1)You have a bucket that holds 4 gallons or water and a second bucket the holds 7 gallon of water. The buckets have no markings. How can you go to the well and bring back exactly 5 gallons of water?
2)Okay this one involces a picture I will describe it best I can. It is a picture of 3 dots evenly placed out and a line under it and 3 foot steps under the line. Suppose you are a detective and found these tracks on some damp ground. Do you have any ideas how they were made?
3) Why are 1980 pennies worth almost 20$? (I don't think the answer is obvious as it look and maybe involves what the value of pennies in 1980 was.)
4) Another picture but very simple. 3 blank boxes plus another 3 blank boxes equal 3 blank boxes. Place the digits 1 through 9 in the nine squares to form a correct addition. Is there other ways todoit

2007-12-30 07:34:51 · 4 answers · asked by hi123456789 3 in Mathematics

2007-12-30 07:33:53 · 7 answers · asked by Anonymous in Mathematics

2007-12-30 07:33:32 · 13 answers · asked by luck12 1 in Astronomy & Space

A. Coal
B. Wind farms
C. Solar Cells
D. Nuclear power

2007-12-30 07:31:02 · 4 answers · asked by mona S 1 in Earth Sciences & Geology

"A student asked, "since electric potential is always proportional to potential energy, why bother with the concept of potential at all?"How would you respond."

This is how the question asked in my book [UNIVERSITY PHYSICS].So how do you respond to this question?

2007-12-30 07:29:11 · 5 answers · asked by Anonymous in Physics

How to solve?

2007-12-30 07:25:20 · 10 answers · asked by KateMcKenzie. 2 in Mathematics

2007-12-30 07:22:06 · 6 answers · asked by Love...love....love... 3 in Earth Sciences & Geology

1) Five times the first of three consecutive even integers is fourteen more than three times the second. What is the third consecutive integer?
2) Martha and Sally had lunch together on Tuesday. Sally paid $2 more than Martha. If the total bill was $5.64. How much did Sally pay for her lunch?

2007-12-30 07:21:37 · 7 answers · asked by Anonymous in Mathematics

in chem. lab we scratched dents in the edge of a penny with a file and left it in hydrochloric acid overnight. the zinc reacted and left just the copper shell.
i think it's chemical but i need to explain more.

2007-12-30 07:21:00 · 2 answers · asked by kryzzal5 2 in Chemistry

Prove this:
(tan A + sec A - 1) / (tan A + sec A + 1) = (1 + sin A) / cos A

2007-12-30 07:19:58 · 11 answers · asked by Chump 1 in Mathematics

Find a polynomial with real coefficients and least degree having the given zeroes:

-2 + radical 5, -2- radical 5, -2, 1

I'm trying to finish my math review for finals and we haven't learned this yet. So frustrating, please help!

2007-12-30 07:18:10 · 2 answers · asked by ? 2 in Mathematics

Man I suck at these. Thanks for any help!!!! <3333333

1. Joe is 5 years older than Sally. In 15 years Joe will be 3 times as old as Sally is now. How old is Sally now

2. The length of a rectangle is 3 more than twice its width. The perimeter is 48 feet. Find the width.

3. Fifteen more than four times a number is 6 more than five times the number. Find the number

2007-12-30 07:15:25 · 12 answers · asked by Anonymous in Mathematics

i am trying to make steam using a car cig lighter. the water is in a 8x3x2 plastic container that is hand held with a hole at one end.i am looking for something to put inside the plastic container to heat the water and turn it into steam,the steam will come out of the hole.something that will turn the water to steam very fast.can you hepl now?

2007-12-30 07:14:44 · 7 answers · asked by bchaf 1 in Engineering

I'm doing a lab write up. The lab was about convection and we put cold water in a small vial and placed that in a big beaker of hot water and then the opposite. We have to write a conclusion about what we learned and my teacher is very picky. has anyone ever done this lab or one similar and can help?

2007-12-30 07:12:39 · 1 answers · asked by Joanna H 1 in Earth Sciences & Geology

The problem is (2+3x)-6(x^2-x). The ^ indicates to the power of. Thanks a lot!

2007-12-30 07:12:23 · 5 answers · asked by Little Dreams 2 in Mathematics

will the galaxy collapse into itself?

2007-12-30 07:10:48 · 23 answers · asked by Anonymous in Astronomy & Space

The thermite reaction, used for welding iron, is the reaction of Fe3O4 with Al.

8Al (s) + 3Fe3O4 (s) = 4Al2O3 (s) + 9Fe (s)
H = -3350jk/mol

Because this large amount of heat cannot be rapidly dissipated to the surroundings, the reacting mass may reach temperatures near 3000C. How much heat is released by the reaction of 23g of Al with 57.6g of Fe3O4.


Im lost here. I was told i needed to find the limiting reactant? why? overall im totally lost here.

thank you.

2007-12-30 07:09:56 · 2 answers · asked by senseless.student 1 in Chemistry

2007-12-30 07:07:04 · 3 answers · asked by Love...love....love... 3 in Earth Sciences & Geology

2007-12-30 07:03:57 · 16 answers · asked by Anonymous in Chemistry

If the line y = 4x + 3 is tangent to the curve y = x^2 + c, then c is...
A) 2
B) 4
C) 7
D) 11
E) 15
me and my friend got 7 and i think that's the right answer, but i don't really understand how i came to that conclusion. :/ can someone explain to me why it's C [7]?
and i do know tangent lines, so no need for any explanations about what a tangent line is. i just don't understand how c = 7 in the equation. :/
thanks!

2007-12-30 07:03:17 · 6 answers · asked by sooper mouse! 2 in Mathematics

2007-12-30 07:02:53 · 1 answers · asked by i'm a miracle 2 in Biology

2007-12-30 07:02:16 · 4 answers · asked by Anonymous in Weather

The ^ indicates "to the power of".

2007-12-30 07:01:50 · 8 answers · asked by Little Dreams 2 in Mathematics

2007-12-30 06:59:34 · 1 answers · asked by jumpy789 1 in Earth Sciences & Geology

Can LOGIC ever be objective in it's nature?

2007-12-30 06:52:33 · 7 answers · asked by Anonymous in Physics

Is it usually y=mx+c or y=mx+b?
I've seen people use both but which one are you supposed to use? Explain please.

2007-12-30 06:51:28 · 10 answers · asked by curiosium 1 in Mathematics

AZ 1300 hrs, 11/12/07..I-10 between 81/69 offramps/crystal clear weather very light traffic./west bound. Suddenly a strange out of this world craft appeared ahead of me crossing right to left as if on final approach. It crossed ahead of me about 250 yards, and on the other side of the freeway it rapidly accelerated and then just within 5 seconds it was out of sight and disappeared. It was about the size of a Cessna their was no propeller, no wings, no portholes, no exhaust no visible heat or method of propulsion. I am now a believer.

2007-12-30 06:50:09 · 10 answers · asked by ronq77 1 in Astronomy & Space