6 posts tagged with physics and power. (View popular tags)
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# Help me help some kids approximate the work done to move air through a tube

I need to approximate, very simply and avoiding any mention of fluid dynamics because this is for schoolkids aged 14-16, the forces acting on a volume of air that is being pulled through a tube by a fan. My physics is failing me. Help!
posted by dowcrag on Mar 9, 2012 - 6 answers

# How do I stand up a utility pole with no heavy machinery?

I have a 30' utility pole that I need to stand upright in a 6' deep hole. Complicating factor: the location is set back in the woods, so using heavy machinery or vehicles of any kind is not an option.
posted by tr0ubley on Aug 13, 2010 - 26 answers

# Drill It Into My Head

Help me understand electricity and physics and how they apply to motors. I have my head around electricity basics and electromagnetism, but I have a few unanswered questions about the more subtle aspects.
posted by kaizen on Jun 22, 2008 - 11 answers

# Is there a minimum amount of power required to sustain a given bandwidth?

What, if any, is the relationship between bandwidth and power?
posted by odinsdream on Nov 19, 2007 - 14 answers

# Hydroelectricity times N

Power generation: Let's say we have a hydroelectric dam. My understanding is that water turns a dynamo, which provides electricty. It seems like there would be a way to use the same water flow more than once. Could we make raceways of some indeterminate length to get the water back up to speed with sufficient force to turn a second dynamo? Could this be repeated so that a single water flow powers some n dynamos? What kind of constraints keep dams all over the world from doing this sort of thing?