Science & Mathematics - 7 July 2006

A rancher friend of mine asked me this question today and I thought it was too complex for me to answer as I am a carpenter and this does not come up in my line of work:
If a water supply containing 10 acre ft of water is 100 feet above the land to be irrigated and has a slope of 45 degrees, a regulated 12 in pipe is inserted at the bottom of the reservoir as the pipe gets smaller the pressure becomes greater but the volume gets smaller. The question is what is the greatest size pipe at the bottom of the grade that will give 125 psi. the slope is 300 feet long and at the bottom the pipe will be attached to a sprinkler system the pressure cannot exceed 125 psi.

2006-07-07 12:00:42 · 6 answers · asked by Anonymous in Mathematics

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Earth and Space?

Whats an example of how gravity is used in creation AND destruction of celestial objects?

2006-07-07 11:56:52 · 4 answers · asked by MANY 1 in Astronomy & Space

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Is it true that there are more stars in space then there are grain's of sand on earth?

2006-07-07 11:55:57 · 25 answers · asked by tony f 1 in Earth Sciences & Geology

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Earth & SPACE?

Whats an example of how gravity is used in creation AND destruction of celestial objects?

2006-07-07 11:52:15 · 4 answers · asked by MANY 1 in Earth Sciences & Geology

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If there is no air in space, how does the sun burn?

Ok, so I've asked this question to just about every teacher I've ever had, and they all give me the same answer: The sun doesn't so much "burn," but rather "explodes" contintuously. As far as I understand, these are hydrogen explosions. This all sounds logical to me and, having a basic understanding of science, it makes sense. But it still bothers me! If there are any serious scientists out there, please put my mind at ease!

2006-07-07 11:50:42 · 13 answers · asked by Anonymous in Astronomy & Space

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Has anyone ever come up with a mathematical formula for solving arguments?

2006-07-07 11:50:22 · 7 answers · asked by banarger 1 in Mathematics

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What is the correct statistical sample size for 500000 database records and how did you determine it?

I have a formula, n>= (Np(1-p))/(N-1)*D + p(1-p); D = ((magin of error)^2)/((z-alpha)/2)^2. However, I don't understand how z-alpha is calculated.

My goal is the following: I have converted 500000 database records from my old legacy system to my new system. I don't want to validate all 500000 records. Instead, I would like to validate some sample of the data. How many records should I investigate if I want a 1% or 3% or 5% margin of error?

2006-07-07 11:46:53 · 3 answers · asked by Justin S 1 in Mathematics

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What is one another way besides low tempurature that hydrogen and helium can remain on a planet?

2006-07-07 11:43:22 · 4 answers · asked by computerbum 2 in Astronomy & Space

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Would you trust yourself with the power of God?

If you created a device that could be implanted into the brain, enabling one to 100% brain functionality, would they then hold the power of God? If this was possible, would you then trust yourself to have this device implanted into your own brain without harming everyone around you that you care about? Or would you trust another to implant it within his/her self knowing that there would be no stopping or controlling that person?

2006-07-07 11:40:15 · 12 answers · asked by Bryan 1 in Other - Science

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what do whales eat.?

2006-07-07 11:33:34 · 33 answers · asked by Anonymous in Biology

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What is electromagnetics and why can't we use it as a power source?

2006-07-07 11:32:46 · 4 answers · asked by J.D. 1 in Physics

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Can the world produce "Food Replicators" like on Star Trek?

Are we any nearer to this Sci-fi becoming a reality and if so, who is leading the R&D?

2006-07-07 11:30:54 · 8 answers · asked by G G 2 in Engineering

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Engineering as a career, have I gone wrong (please help)?

I'm studying mechanical engineering because it seemed so cool to me. Currently, I am an intern for a company and have been viewing the engineers closely. This company does mostly large scale projects for other companies. The engineers I have seen in the field are always moving from city to city, working out of little trailers staring at drawings all day cursing the people who created them and requesting more information to relay to the workers. The engineers that I've seen in the corporate offices, usually because they have been with the company longer, also stare at drawings all day, estimating materials and searching for problems.The engineers who have been with the company for a very long time have nice offices and look at everyone elses drawings to make sure they didnt screw up. When I joined began my study of engineering, I had dreams of staying stable in a city(not moving from place to place) running cool experiments and solving unique problems. Was I in denial this whole time?

2006-07-07 11:27:17 · 9 answers · asked by to the beat in my head 3 in Engineering

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can i connect two electric scooter batterys together to make go faster?

or will it just stay charged for longer

2006-07-07 11:26:44 · 11 answers · asked by dagit66 1 in Engineering