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Science & Mathematics - 15 October 2006

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Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

2006-10-15 18:53:42 · 19 answers · asked by Brian A 1 in Physics

Let A be and m x n matrix.

A. If B is a nonsingular m x m matrix, show that BA and A have the same nullspace.

B. If C is a nonsingular n x n matrix, show that AC and A have the same rank

2006-10-15 18:50:32 · 2 answers · asked by Sean H 2 in Mathematics

I need help balancing this equation:

aluminum sulfate + calcium hydroxide = aluminum hydroxide + calcium sulfate

Al2(SO4)3 + Ca(OH)2 --> 2Al(OH)3 + 6CaSO4

i need to know what the coefficients are.

please answer seriously!
thank you.

2006-10-15 18:48:02 · 1 answers · asked by Anonymous in Chemistry

For example 113 not by calculator.

2006-10-15 18:41:39 · 9 answers · asked by horse 2 in Mathematics

2006-10-15 18:34:05 · 9 answers · asked by Anonymous in Biology

2006-10-15 18:33:10 · 8 answers · asked by vijapefi 1 in Mathematics

One of the neighbors to my place of business wants us to put up a fence because he says the wind only blows from the west and our debris is getting in his yard. His construction debris is getting on our landscaping. He says thats impossible because, again, the wind only blows west. Someone tell me this guy is full of it.

2006-10-15 18:32:07 · 19 answers · asked by Jacqueline S 1 in Weather

Can anybody figure out how many times harder you would have to hit a 12'' softball to travel the same distance as a 9" baseball. All conditions, wind, humidity, altitude, and temperature are the same.

2006-10-15 18:29:18 · 3 answers · asked by darrin2121 2 in Physics

I have googled, only recognize they r different by picture..

wikipedia nothin about difference...
other sites useless..

2006-10-15 18:25:17 · 1 answers · asked by top_ace_striker 2 in Biology

2006-10-15 18:22:55 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-15 18:22:42 · 6 answers · asked by veebee73 1 in Earth Sciences & Geology

What do you think causes ice ages? Most of you will probably say the tilt of the Earth on it's axis, I think that that is the reason also. As the Earth tilts one way, we move closer to the Sun, which is the process we are in right now, which is why I don't believe in Global Warming (LET ALONE AL GORE). And then every million, or 10,000 years, or whatever it is, we move farther away from the Sun. That is what I think cause ICE AGES.
This is a very real subject, what do you think will happen in the next few hundred years?

2006-10-15 18:21:38 · 10 answers · asked by Lawton 3 in Earth Sciences & Geology

Where it snows, they have 'snow days'....there's too much snow. I think we need 'heat days'...where if it's too hot, then it's treated as a snow day--no school. Ugh, I remember PE in the heat here in AZ...it sucked rocks! Those who have high heat/high humidity know what I'm talking about!!!! What do you think? LOL!

2006-10-15 18:20:01 · 3 answers · asked by Jen-Jen 6 in Weather

vaccum atmospere without the air,andthe kodak film will melt in that hot,and how can he take the photos clearly and accuratley by keeping on his chest and many more questions i have

2006-10-15 18:14:01 · 17 answers · asked by abdul 1 in Astronomy & Space

How to convert guage(thickness) to merter or milimeter ?

2006-10-15 18:11:56 · 2 answers · asked by priyesh 1 in Engineering

What makes each planet rotate around the axis with different time?
The Earth (or other planets) revolves around the Sun, this makes sense. But why it has to rotate around its axis?

To rotate around the axis each takes:-
Mercury: 58 days 14 hours
Venus: 243 days 5 hours
Earth: 23 hours 56 minutes (1 day)
Mars: 24 hours 37 minutes
Jupiter: 9 hours 50 minutes:
Saturn: 10 hours 14 minutes
Urenus: 17 hours 14 minutes
Neptune: 16 hours 7 minutes
*** Pluto: 6 days 9 hours

2006-10-15 18:11:45 · 16 answers · asked by Anonymous in Astronomy & Space

If I had one solar pannel connected to a battery, it's outputting X units of power.
A) What is that output power measured in? Volts? Watts? Other?
B) If I connect a second, identical pannel to the same battery, would I necessarily be getting 2X units of power?
C) What would the difference be if those two pannels were connected to the battery in series or in parallel?

2006-10-15 18:11:17 · 4 answers · asked by alphacheez 2 in Physics

I opened a can of coke and took a drink, then sat down the can. About 2 minutes later the soda started fizzing out the top of the can. By the time it quit fizzing about 3-5 minutes later, it was completely flat.

2006-10-15 18:08:53 · 8 answers · asked by Dani C 1 in Chemistry

A body seems to look black when it absorbs all the wavelengths reflacts none.So why it is a colour.How a colour is possible witout wavelength.

2006-10-15 18:06:15 · 26 answers · asked by gobul 4 in Physics

when conducting an experiment of falling bodies why is the distance of the steel ball measured from the bottom of the ball rather than the center of the steel?

2006-10-15 18:04:49 · 7 answers · asked by 3ajeeba_q8 2 in Physics

The current in the electron beam of a computer monitor is 340 µA. How many electrons per second hit the screen?
electrons/s

2006-10-15 18:04:13 · 6 answers · asked by Anonymous in Physics

should I use Kepler's 3rd law and how?

2006-10-15 18:00:54 · 5 answers · asked by Anonymous in Astronomy & Space

0

convert 50mA to Amperes

2006-10-15 17:55:23 · 6 answers · asked by Anonymous in Physics

The micro organisms had something to do with the crashing coputers. I need to how and why the crashed the computers.

2006-10-15 17:55:08 · 3 answers · asked by kittykatgirlmeowmeow 1 in Earth Sciences & Geology

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