Science & Mathematics - 1 December 2007

There is an orphanage back home in Zimbabwe that is trying to set up a solar system for their previously electric 30-meter-deep borehole (electricity is now scarce there) ... how do I even begin to know what I'm looking for? What questions do I need to ask about the borehole there? What should I look for on the solar panels? Besides solar panels, what else do I need to set this up? Shipping is no problem, there is a huge crate being sent over there soon that can take them. I'd really appreciate the help!

2007-12-01 11:09:44 · 7 answers · asked by rapunzeltd 1 in Agriculture

cube,then radical sign,then under radical sign put24x^5y^7

2007-12-01 11:03:09 · 4 answers · asked by Rhonda H 1 in Mathematics

1. involves reduction, which is a loss of electrons.

2. converts chemical energy to electrical energy

3. converts electrical energy to chemical energy

4. involves electrolysis reactions which always produce a gas at at least one electrode.

5. involves oxidation, which is a gain of electrons.



Another question::
A copper wire dipped in a solution containing Ag(CN)2^- ions acquires a silver coating because:

1. Ag+ oxidizes Cu to Cu^2+ in a spontaneous process until silver metal completely covers the Cu.

2. Cu^2+ is stronger ox agent tahn Ag^+

3. H^+ reduced by Cu to H2, & Ag^+ ions are reduced by H2 to metallic silver.

4. Ag is a stronger reducing agent than Cu.

2007-12-01 10:58:24 · 2 answers · asked by LovelyLady 3 in Chemistry

it is based on power station engineering

2007-12-01 10:58:03 · 1 answers · asked by Anonymous in Engineering

x^2/5 divide by x^7/5

2007-12-01 10:57:46 · 10 answers · asked by Rhonda H 1 in Mathematics

2007-12-01 10:55:45 · 3 answers · asked by Anonymous in Biology

What is the area of 5cm, 6cm,10cm, and 3cm. And How do you find it????
this is the shape:
5cm
____
l l _____
l__________l3cm
10 cm

The 6cm goes on the left side!( the one that is below the 5 cm and above the 10 cm)
The one that has ll_____ is supposed to be shifted over a bit so it lines up with the 5cm line and the 3 cm line!!
Thanks for your help!!!!

Alaskan_Alli

2007-12-01 10:55:03 · 4 answers · asked by Alli L 1 in Mathematics

how would you write this as a fraction a / b , where a and b are intergers but b "=/=" 0


a) .75

b) .39 ( there is a line over 9)

2007-12-01 10:54:35 · 6 answers · asked by Anonymous in Mathematics

The radius of the moon's orbit is about ________ times larger than the radius of Earth.
5. 2.9 x 107 is the same as (if written out)

2007-12-01 10:54:29 · 3 answers · asked by sweetnovember4 2 in Astronomy & Space

Melting temperature for steel = 1532 C, but temperature for any
fuel air fire whose only source of oxygen is open air = 233 to 250 C.

Videos & photos of Molten Metal on 9/11 - impossible to create from an air fire!
http://www.youtube.com/watch?v=JithuVAIb7Y

Controlled demolitions of 3 WTC buildings:
http://www.youtube.com/watch?v=Qa7PN-8T2VY

Building 7 was not hit by any plane or seriously damaged:

http://www.youtube.com/watch?v=EZ9BofDUXv0
http://video.google.com/videoplay?docid=2073592843640256739

Flight 93 - where is the wreckage and debris? :
http://www.youtube.com/watch?v=-59kouBgO_s&NR=1

Pentagon - where is the 80 tonnes of jet plane debris? :
http://www.youtube.com/watch?v=Rgyq2H7PpO0
http://www.youtube.com/watch?v=lSeaZLYViwU

Detailed scientific analysis of what happened on 9/11:

http://truth911.net
http://seeloosechange.com
http://911weknow.com
http://belowgroundsurface.org

Architects & Engineers for 9/11 truth

http://ae911truth.org

2007-12-01 10:50:25 · 4 answers · asked by Anonymous in Engineering

2007-12-01 10:49:46 · 11 answers · asked by Nani Girl 3 in Zoology

2007-12-01 10:48:48 · 4 answers · asked by Anonymous in Engineering

To dislodge ketchup from the bottom of a ketchup bottle, the bottle is often turned upside down, thrust downward at a high speed and then abruptly halted, and I know that's got to do with Newton's First Law.

But how would I describe how it is? I don't know how to explain it.

2007-12-01 10:48:25 · 6 answers · asked by Anonymous in Physics

??????? help

2007-12-01 10:45:12 · 7 answers · asked by MCRmy soldier 2 in Mathematics

1) A stick of length L = 2.0 m oscillates as a physical pendulum. (a) What value of distance x between the stick's center of mass and its pivot point O gives the least period? (b) What is that least period?

2007-12-01 10:43:23 · 1 answers · asked by Anonymous in Physics

a spring has a spring constant of k=55.0 N/m. The spring is compressed a distance of 3.50 cm. What is the potential energy start in the spring?

2007-12-01 10:40:23 · 2 answers · asked by 832 1 in Physics

2007-12-01 10:39:10 · 11 answers · asked by Anonymous in Mathematics

2007-12-01 10:36:25 · 5 answers · asked by Nani Girl 3 in Zoology

Solve for x

sinxtan3x=0 [-π,0]


The answer is supposed to be x = 0, -π, 3π/4, -3π/4 but I have no clue how to simplify the above equation. Please show steps.

2007-12-01 10:34:45 · 6 answers · asked by Dave H 2 in Mathematics

In the following exercise, test for symmetry and then graph the polar equation.

r = sin0(theta) + cos 0(theta)

2007-12-01 10:33:36 · 1 answers · asked by ambriz_jesus16 1 in Mathematics

2007-12-01 10:31:43 · 2 answers · asked by fidencia p 1 in Earth Sciences & Geology

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.
(a) zero degrees (b) +5.3° (c) –9.6°(d) –84°(e) +90°

L= .035 H
V = 60 Hz
R = 150 ohms
C = 1.75 x 10^-6 F

Ive been trying to figure it out for an hour, the answer is -84 degrees but i dont understand how to get that.

2007-12-01 10:28:25 · 3 answers · asked by Abc 3 in Physics

What is the biological method of shearing in Australia??

2007-12-01 10:27:41 · 2 answers · asked by Anonymous in Biology

...in particular a three dimensional circle,as 1 radial degree holding (diagramatically of course) numerals, functions, and results, another degree holding numerals, a different function than function A, and results, etc, my very very real question is how do I incorporate the numerous states(degrees of) positive/negative value, as like an x/y graph, without it becoming a mess, ps. the actual length of the numerical lines are irrelevant, they can be 1 to 100 or a google per line, or abstract function values.

2007-12-01 10:18:51 · 1 answers · asked by Book of Changes 3 in Engineering

I have:
hydrogen .5atm
iodine 1atm
hydrogen iodide 5.2 atm
in a 1 Liter container at 273 degrees K

I need to find the equilibrium constant:
in order to do that..i have to find the number of moles of each gas, but i'm not sure how to do that...using PV=nrT on each gas doesnt seem to give the right answer because 1 liter is my COMBINED volume ..not the volume of each gas...HELP!

How do i find the moles of each gas so that i can plug it into the formula for the constant?

2007-12-01 10:15:21 · 1 answers · asked by mikala m 2 in Chemistry

2007-12-01 10:15:02 · 2 answers · asked by nick s 1 in Geography

ok so you've heard the saying every snowflake is different right? how do you know that? was it really proven or is it just a saying? how would you prove something like that?

2007-12-01 10:14:23 · 4 answers · asked by Anonymous in Weather

i am curious

2007-12-01 10:13:54 · 26 answers · asked by Ranger 3 in Astronomy & Space

2007-12-01 10:12:53 · 3 answers · asked by Anonymous in Mathematics

thank you!

2007-12-01 10:12:17 · 5 answers · asked by Robert 1 in Mathematics