December 3
Cultivation Theory
"television reality, heave/light viewers, mean world syndrome, mainstreaming, and double dose effect" I know what they mean, but just need to find out George Gerbner himself's definitions for them. Thank you a lot!
(edited to fix screen stretch by froth )
chemical bonding
Dear Sir/Madame,
Could you please clarify the following - Why is the H-N-H bond-angle in ammonia molecule (NH3) greater than the H-As-H bond-angle in arsine (AsH3)?
-Sruthi.
Electrical interference
I hope I'm asking this in the right place. My friend and I are working on a home recording project, and we've encountered an electrical mystery. We've got (a) a mixing board, which is plugged in, (b) powered speakers that are connected to the mixer and plugged in on their own and (c) a laptop, connected to inputs and outputs on the mixer via a RCA-USB hub device, and often also plugged in to the house's AC power supply. Here's the mystery: when the laptop is plugged in, the speakers hum. It's a pretty irritating and inconstant crackly hum. If we unplug the computer, or disconnect it from the mixer, the hum stops. If we move the computer across the room and plug it in far away from the speakers, the hum gets quieter, but we can't get it to go away without disconnecting something.
What in the devil is that hum, and is there some easy trick involving grounding something or breaking a loop somewhere that would make it go away? -GTBacchus (talk) 03:43, 3 December 2006 (UTC)
\ | / | | | \ | / or | | | \|/ | | | GND ------------- GNDDoes the problem go away if all electrical components are plugged into the same outlet or outlet strip? That may be more important from a hum point of view than the overall ground impedance to an earth ground. If components are plugged in to outlets in different places, the impedance between the ground connections can set up a ground loop such that a small amount of current carried over the ground sheath of the audio cables induces hum. I once corrected a hum problem in a commercial editing studio by getting them to connect all power cables to the same source. Edison 20:50, 3 December 2006 (UTC)
Looking for an article
There's an article which addresses the mathematics and probability of humanity going extinct. More specifically, it looks at what percentage of humans who will ever exist have existed. I've seen it before, but I can't find a link to it either at End of civilization or Human extinction. Thanks. --The Radio Star 04:01, 3 December 2006 (UTC)
Tuning fork
Why does it need two prongs not one? 8-)--Light current 05:00, 3 December 2006 (UTC)
3D Molecules
Are there any good free programs (Windows or Linux) for drawing molecules in 3D? ChemSketch is the de facto 2D program here, but it doesn't do 3D. At least not that I'm aware of. Please don't direct me to the computing desk. They already sent me here. --Russoc4 05:38, 3 December 2006 (UTC)
Durability of bleach
Chemical bleaches work in one of two ways:
(a) An oxidizing bleach works by breaking the chemical bonds that make up the chromophore.
(b) A reducing bleach works by converting double bonds in the chromophore into single bonds.
Which of the above gives more durable bleaching effects?
Thanks very much indeed for advice.
nitric oxide
Dear Wikipedia
please can you forward this enquiry to the correct department / person who can answer my important enquiry regarding NO supplements. its regarding Nitric Oxide supplements with regards to penile erections. viagra works by increasing the amounts of NO so will NO supplements work the same way in dilating your vessels? what is the difference? I read several articles on it in your enclopedia but still confused.
looking forward to your prompt reply
kind regards
Nixon Chan.
I am curious, since nitric oxide is a gas, what the enquirer was referring to as "supplements"? alteripse 14:28, 3 December 2006 (UTC)
-deltaG and positive reduction potential
How does -deltaG correlate with electron movement toward more positive reduction potential? (as in Electron Transport Chain)
chrome exploration?
How does one discover chrome? Is it a mineable iron substance? How is chrome discovered? How does one expore for chrome and where is it found? Is it a bi-product of what???someother mineral? Does it have to be drilled or is it a surface observation? Where are chrome desposit found? Is it like ore? Does it have magnetic qualities? Can it be detected from aerial surveilance? Where are the world's deposits of chrome. Is it a covering for knives and forks only? Where it used in the world? What are its main contributions to the world economy? Is it of any value in a global sense? How can it best be used?
The word chrome usually means chromium plating, which was once common for car grills, among other things. StuRat 09:16, 4 December 2006 (UTC)
Conductivity Data
What are the conductivities of pure silicon and phosphorous doped silicon, can some please provide some sources for this information. Philc T E C I 14:36, 3 December 2006 (UTC)
building a spaceship from scratch
Using the concepts of cost and price analysis to build a spaceship from scratch. What to look for from the viewpoint of a government agency and as a contracting officer for the government.
The first thing is you need to know what the payload will be. That is, what are you transporting and to where ? The next thing to decide is the type of spaceship. A traditional liquid fuel rocket is probably the cheapest. Then decide who will launch it for you. Then pick subcontractors to build the components. StuRat 15:02, 3 December 2006 (UTC)
- I'm not sure this is a homework question, so I'll assume good faith and have a stab at answering, although if the asker is a 'government contracting officer' then I have to admit I'm a bit surprised that the Wikipedia Science Reference Desk is now an approved source of advice - maybe we should be flattered ;-). Anyway, StuRat is correct that the first thing you'll need to know, at least vaguely, are the approximate mass of the payload to be launched and where in space you want to get it to. If by 'spaceship' you mean a human-qualified vehicle then the cost is likely to be orders of magnitude greater than for an 'expendable' science payload, and recommended reading for starters would be Pranke & Larson's Human Spaceflight: Mission Analysis and Design. That book includes some basic information on parametric cost estimation, which is the first stage in approximating the cost of your mission. Some useful parametric estimators can be found at Johnson Space Centre's Cost Models. The cheapest launch route, at least for scientific payloads, is likely to be an existing launcher such as ESA's Ariane V. If you want to go somewhere other than a 'conventional' low-earth, geostationary, geosynchronous or Molniya orbit (or even for one of these depending on the launcher used and the size of the payload), you may need to use upper stages which will need their costs estimated separately. When estimating the cost of a spacecraft, you'll need to know not just the 'cost per unit' but also the development cost, which is likely to be very high for 'scratch' projects, and which will need to be amortised over the production run. Then there are the costs of things like software (either COTS or bespoke) and mission operations. I would advise some in-depth background reading if you're new to the subject, before you even embark on basic estimates, as you'll need to know whether your project lies within the limits of applicability of whatever parametric model you're using. Another good book for starting out is SMAD3. If you're working for a government agency then the best option would probably be to seek advice from your country's national space agency if it has one, or from spacecraft mission design experts at academic institutions. Good luck =) --YFB ¿ 04:03, 4 December 2006 (UTC)
Mineral Water / Cola Sales
I was wondering recently - which has sold more: any form of mineral water or any form of cola? I imagine that mineral water hasn't been widely available as long as cola has been, since the benifits of mineral water as opposed to tap water were discovered fairly recently (as far as I know). RevenDS 15:38, 3 December 2006 (UTC)
Carbonated water freezes
My fridge is broken. It's at -0 something Celsius. Just now, I took out a bottle of carbonated (fizzly) water, and as soon as I opened it, it began to froze, seemingly from the top to the bottom. Is there any explanation to this..? 81.93.
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