Science & Mathematics - 16 August 2007

1.) 5x + 7 = 3x + 21

2.) 3x - 2(5 - x) = -3(x - 10) + 3x

3.) 5(x + 1) = 3(2x + 3) + 5

2007-08-16 17:43:00 · 8 answers · asked by Anonymous in Mathematics

Why not use the Grand Canyon as a massive garbage dump? Use the section that no longer has the river running through it or dam/divert the river from another section. It will take thousands of years before it gets filled up.

2007-08-16 17:32:38 · 8 answers · asked by Anonymous in Earth Sciences & Geology

I mean, why haven't we figured out what gravity is yet?

2007-08-16 17:24:13 · 5 answers · asked by Atlas 6 in Physics

please explain

2007-08-16 17:22:02 · 5 answers · asked by jannel s 1 in Mathematics

2007-08-16 17:21:57 · 6 answers · asked by Francine M 4 in Weather

when one says the design of the structure complies with the seismic Zone 4, what does it mean? what is the equivalent of Zone 4 under richter scale?

appreciate any feedback..

2007-08-16 17:18:20 · 3 answers · asked by jaz 1 in Earth Sciences & Geology

Okay so the problem is: A 8.746 gram mixture of calcium hydroxide and potassium hydroxide is exposed to an atmosphere of pure CO2. The mass of solid increases to a final value of 14.472 grams. Calculate the percentages of the individual solids in the original mixture, given that the following reactions occur.

Ca(OH)2 (s) + CO2 (g) ==> CaCO3 (s) + H2O (g)
KOH (s) + CO2 (g) ==> KHCO3 (s)


Thanks so much. I dont really need you to show me every detail of how to do it, but just the start of a basic idea of what I'm supposed to do would do fine. thanks again!

2007-08-16 17:18:06 · 3 answers · asked by Melody 2 in Chemistry

2007-08-16 17:16:16 · 7 answers · asked by Anonymous in Chemistry

you know the ones from those garden solar lights i would like to know how many watts the pannel on that puts out

2007-08-16 17:10:46 · 8 answers · asked by DEWEY 2 in Engineering

2007-08-16 17:08:47 · 6 answers · asked by JAMES 4 in Astronomy & Space

Why is that in the Atlantic they call it a Hurricane, but in the Pacific they call it a Typhoon? I know they're the same thing and such but was there any specific meaning behind it?

2007-08-16 17:06:29 · 9 answers · asked by Abby = 2 in Weather

How do I prove this?

2007-08-16 17:03:47 · 3 answers · asked by TAS B 1 in Physics

The maximum amount of N2H4 (hydrazine) that can be prepared from 14 grams of nitrogen and 28 grams of hydrogen by the reaction N2 + 2 H2 = N2H4 is ?
a) 16 grams
b) 28 grams
c) 32 grams
d) 42 grams
e) none of these values

2007-08-16 17:01:49 · 6 answers · asked by Pam 1 in Chemistry

Is there a program or website that has an online astronomical starfinder?

I used StarryNight's apple widget the other day and it was an excellent little program to help find things - is there any simple starfinder type program availible anywhere on the internet that can show you what stars are up in the sky at a specific time like this widget for us Vista users?

2007-08-16 16:58:55 · 4 answers · asked by nindash 1 in Astronomy & Space

haha i promise its not hard, im really tired right now. and dont feel like it. its that easy beginning of the year stuff.

all i need to know is
volume- its definition basic unit- and the tool used
mass-definition-basic unit-tool used
and thats it
(there was more but that was just temperature and length i got that coverd!)

2007-08-16 16:53:56 · 3 answers · asked by *_!PEACE!_* 2 in Other - Science

In one mole of C6H14O6 there are approximately how many grams of oxygen ?
a) 66
b) 96
c) 180
d) 36 x 1023
e) none of these values

2007-08-16 16:49:59 · 4 answers · asked by Anonymous in Chemistry

Its been said that nothing can escape from Black holes ,not even light ! but on contrary we also say what black holes cant consume buldges out in form of white super hot X Ray. Can someone clear this out Pls

2007-08-16 16:48:11 · 8 answers · asked by siddharth b 1 in Astronomy & Space

Show me the steps? thanks
4/7 = 6/c-6 - 8/c-2
Would I start out by finding a common denominator? Would the common denominator be c-42, is c-42 the same as -42c?
Oooooh I am confused.

2007-08-16 16:47:00 · 5 answers · asked by Boo Radley 4 in Mathematics

if the sped of light in the sunout to the suface is about as fast as my nails grow what suddenly propells it to the real speed of light when it reaches the suface? Why does it not gain speed gradually as it eascapes the suns gravity?

2007-08-16 16:46:39 · 5 answers · asked by ? 3 in Astronomy & Space

2007-08-16 16:45:59 · 9 answers · asked by phoenixfighter00 2 in Mathematics

Kalpana Chawla (indian-american astronaut ) was killed 4 years ago. And I look up to her for who she was. I know she's in a good place. I have made a video in her memory for school. Do you think she's proud of me for making the video? She's alive in my heart. I had a dream that she told me to walk in her shoes. Does she want me to be an astronaut? or work for NASA?

2007-08-16 16:42:11 · 3 answers · asked by ? 5 in Astronomy & Space

Does anyone out there genuinely believe in spirits/ghosts etc. and not actually had an experience with it to make them think that way?
Do people have experiences and still say that they dont believe it?

2007-08-16 16:41:24 · 20 answers · asked by Anonymous in Paranormal Phenomena

2007-08-16 16:35:25 · 1 answers · asked by ram_ 1 in Biology

A brewery uses compressed air for its production processes. It employs a compressor driven by an AC motor to produce the required volume and pressure during production days (Monday to Friday). The power consumed by the compressor is just alright during peak load or high plant air demand. Now, during lean days (Saturday and Sunday) only about 20% of the total compressor capacity could be utilized by the plant with the same and only one high power compressor motor. The management wants to cut down operational expenses.

2007-08-16 16:31:52 · 6 answers · asked by Jules G 1 in Engineering

Is there any part of your country where it doesn't rain much?
when does it rain most in your hometown?
is it ever affect transprotation?

(^_^) thankyou,

2007-08-16 16:31:40 · 11 answers · asked by Accc 1 in Weather

If so could someone describe and name them for me. Also how thick are these layers and is that what the heat shields on the space shuttle for?

2007-08-16 16:26:34 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I really nee dhelp with these few questions. i will really appreciate the help.

1. 120 is what percent of 80?

2. If the sum of two numbers is 20 and one of these numbers is twice the other, then the smaller number is ?

a. -20
b. 5
c. 7
d. 20/3
e. 40/3

Thank you.

2007-08-16 16:19:38 · 11 answers · asked by Anonymous in Mathematics

Do you think you can help me on my physics homework? I got stuck on number two and the problem reads: The period of a simple pendulum, defined as the time for one complete oscillation, is measured in time units and given by T equals two pi square root of l over g where l is the lenghth of the pendulum and g is the acceleration due to gravity, in units of lenght divided by time squared. Show that this equation is dimensionally consistent.

2007-08-16 16:16:20 · 2 answers · asked by Anonymous in Physics

In regards to the earth?

2007-08-16 16:15:13 · 5 answers · asked by JJ O 1 in Geography

How would i know if my brother is abusing his allergy medicine. Because he's gone through two subscriptions pretty quick and there's no good reason why

2007-08-16 16:14:13 · 2 answers · asked by SG22 3 in Medicine