Science & Mathematics - 26 September 2007

2007-09-26 08:52:50 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-26 08:51:52 · 12 answers · asked by Anonymous in Other - Science

I know the difference between a constant value and a variable value. A constant takes a fixed value and doesn't change. A variable value may take multiple values. But I don't understand the difference between a variable and a parameter. I'm thinking that they are somehow related though...

2007-09-26 08:51:46 · 5 answers · asked by the redcuber 6 in Mathematics

2007-09-26 08:46:47 · 3 answers · asked by antm071993 1 in Mathematics

2007-09-26 08:46:11 · 4 answers · asked by Anonymous in Physics

how would I solve:

(2x^2)+x=30

I got this far, is it right?

x(2x+1)-30=0

How would I solve it?

2007-09-26 08:45:52 · 7 answers · asked by Kaz Wilkosz 2 in Mathematics

I have horrible heartburn.. What food might i have lying around that contains a base to neutralize this?

2007-09-26 08:44:05 · 5 answers · asked by Anonymous in Chemistry

The amount of gas that a helicopter uses varies directly as the number of hours spent flying. The helicopter flies for 2 hours and uses 30 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 6 hours.

a. 90 gallons
b. 12 gallons
c. 105 gallons
d. 96 gallons

2007-09-26 08:43:05 · 5 answers · asked by . 1 in Mathematics

im building a bottle rocket for science, is there a good way to figure out how long my string should be for my parachute?

2007-09-26 08:41:32 · 1 answers · asked by Anonymous in Physics

please, any suggestions?
mucho gracias=]

2007-09-26 08:38:36 · 5 answers · asked by ... 2 in Mathematics

Please help me answer this? anyone?

2007-09-26 08:37:40 · 2 answers · asked by Anonymous in Biology

You notice that when water boils over it causes of the gas burner to turn bright orange. How would you explain the appearance of a color in the flame?

2007-09-26 08:37:39 · 5 answers · asked by student00 2 in Chemistry

2007-09-26 08:36:43 · 2 answers · asked by antm071993 1 in Mathematics

Are than any steps or shortcuts which will help me get the answer easier other than multipying it over and over again.

2007-09-26 08:35:24 · 7 answers · asked by Anonymous in Mathematics

2007-09-26 08:34:26 · 5 answers · asked by antm071993 1 in Mathematics

I need help drawing the contours of f(z)=1/z. I've found Re f =u(x,y) = x/(x^2+y^2) and Im f = v(x,y) = -y/(x^2+y^2). Now what do I do?
Please include an explanation. Thanks...

2007-09-26 08:34:19 · 1 answers · asked by linzaroo06 1 in Mathematics

2007-09-26 08:33:38 · 6 answers · asked by JAMES 4 in Engineering

So I know that an octopus can camouflage itself using pigment sacs in its skin where different colored sacs can be displayed using tiny muscles in the skin. But how does the octopus know what sacs to present (or what color to become) if it cannot see in color?

2007-09-26 08:32:10 · 6 answers · asked by Alex 1 in Zoology

posted this once before but forgot to note that a and b are POSITIVE. need to prove that if 0 or < im assuming[>] ) 1/b.

so if a 1/b.

2007-09-26 08:31:55 · 3 answers · asked by Anonymous in Mathematics

Vector b is subtracted from vector a where ax=3 ay=2 bx=(-3) by=2. What is the x-component of the resulting vector c. What is the y component of the resulting vector c?

2007-09-26 08:30:25 · 4 answers · asked by Andy D 3 in Mathematics

Question line.
Please? =(

2007-09-26 08:29:30 · 4 answers · asked by adriana_00000 2 in Mathematics

I understand the concept of a singularity: an infinitesimally small and dense piece of matter with zero dimension.

Let's use an example of a black hole that started as a star, then collapsed into a black hole upon burning all of its hydrogen/helium. Obviously, this object contained a large number of particles to begin with. My question is, what becomes of all the particles after it has collapsed (and theoretically continues to collapse into a smaller and smaller space forever)? Do the particles themselves continue to shrink, or does the black hole transform into pure energy?

I thought that the consensus was that nothing could be smaller than the Planck length. If this is true, then how could the black hole continue to shrink forever?

Thanks.

2007-09-26 08:28:45 · 4 answers · asked by Karl B 2 in Astronomy & Space

What is the symbol for carbon monoixide, and what reacts to make it? Also is anything else made by the reaction?

2007-09-26 08:27:09 · 14 answers · asked by night rider 2 in Chemistry

Round to the nearest hundredth percent!

2007-09-26 08:25:59 · 3 answers · asked by Anonymous in Mathematics

I take pride in figuring out problems by myself, but these two darned questions have me stuck.

I know that sin 2x = 2sinxcosx and the basics, but I can't seem to reduce these problems in the right way:

sin2x/sinx - cos2x/cosx = secx

sin (x+y) cos (x-y) + cos (x+y) sin (x-y) = sin2x

please show how you got these, in case I run into similar ones. thanks tons!

2007-09-26 08:24:40 · 5 answers · asked by Fundamenta- list Militant Atheist 5 in Mathematics

Ok I am trying to figure out this question about perimeter and area but I need some help.Here is one that I dont get.

*Area of rectangle=42 in sq, width = 3 in.,length =________

Can you please explain to me how to get this?

2007-09-26 08:23:31 · 9 answers · asked by Hannah S 1 in Mathematics

2007-09-26 08:23:25 · 4 answers · asked by Lady M 6 in Zoology

2007-09-26 08:21:47 · 3 answers · asked by Anonymous in Mathematics

1. Key in the first three digits of your phone number (NOT the Area code...)
2. Multiply by 80
3. Add 1
4. Multiply by 250
5. Add to this the last 4 digits of your phone number
6. Add to this the last 4 digits of your phone number again.
7. Subtract 250
8. Divide number by 2

Do you recognize the answer ??

2007-09-26 08:19:08 · 9 answers · asked by TD 3 in Mathematics

A jet plane is flying at a constant altitude. At time t1 = 0 it has
components of velocity v{x} = 88 m/s, v{y} = 111 m/s.
At time t2 = 29.0 s the components are v{x} = 175 m/s, v{y} = 45 m/s.

For this time interval calculate the average acceleration.
Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures.

Find the magnitude of the average acceleration.

Find the direction of the average acceleration (let the direction be the angle that the vector makes with the +x-axis, measured counterclockwise).

2007-09-26 08:04:37 · 3 answers · asked by Anonymous in Mathematics