Recent content by ZeroNine8

Z
Power regulation for solar+laptop

Find a relatively inexpensive DC/DC converter that takes unregulated DC input and regulates it to whatever voltage your laptop requires. I found some of these on google that have an output that you can plug a cigarette lighter adapter for your laptop into for ~$70.
- ZeroNine8
- Post #2
- Apr 9, 2007
- Forum: Ask a Technical Professional
Z
Physics Teacher From Hell!!

the simplest way I would do this would be using an energy method - potential energy converted to kinetic energy (mgh = 1/2 I omega^2). Without numbers, you'll just end up with answers in terms of the mass and length of the rod as well as some constants. Just because you don't understand the...
- ZeroNine8
- Post #10
- Mar 10, 2007
- Forum: Ask a Technical Professional
Z
Help me understand what voltage is.

Imagine you have 2 buckets of water, one on your roof and one on the ground. If they are connected by a pipe, then current would be the amount of water flow through the pipe and voltage could be thought of as the difference in height of the two buckets. (potential energy converted to pressure...
- ZeroNine8
- Post #3
- Nov 5, 2006
- Forum: Ask a Technical Professional
Z
Why do we like reading fiction?

fiction is just an alternate reality's non-fiction. :)
- ZeroNine8
- Post #11
- May 7, 2006
- Forum: Ask a Technical Professional
Z
Building a bridge...sorta.

You said your constraint is a 1" square or 1.1" diameter circle on either end...what about the middle? The closer you make this to a triangle, the better off you are. If there is no limit to your dimensions mid-span, make a 1" wide sheet metal strip to be the base from one side to the...
- ZeroNine8
- Post #2
- Oct 16, 2005
- Forum: Ask a Technical Professional
Z
video capturing problem

i lose at posting :(
- ZeroNine8
- Post #4
- Oct 1, 2005
- Forum: Ask a Technical Professional
Z
Can commercial airplanes 'dump fuel'?

it's quite easy to run a pipe from the fuel tanks to wherever a safe release location might be, whether at the wingtips or at the rear of the plane, etc. The only thing you've got to make sure of is that you don't release it in front of some ignition source, which is pretty easy to do at 300+ mph.
- ZeroNine8
- Post #2
- Sep 21, 2005
- Forum: Ask a Technical Professional
Z
Which animals are capable of perspiring?

Mice have sweat glands (google "mouse sweat glands" and see all the scientific article summaries that pop up). Coyotes, just like all dogs, have sweat glands almost exclusively on their paws. Both of these animals might sweat considerably less than humans, but they can and do sweat.
- ZeroNine8
- Post #17
- Sep 20, 2005
- Forum: Ask a Technical Professional
Z
Which animals are capable of perspiring?

yep, even aquatic ones.
- ZeroNine8
- Post #10
- Sep 18, 2005
- Forum: Ask a Technical Professional
Z
Which animals are capable of perspiring?

wikipedia says that *all* mammals have sweat glands in the skin and have the ability to perspire. The majority of mammals, however, don't have that many glands and don't use this as the primary means of keeping cool. Maybe that's why there's a lot of panting going on in the animal kingdom.
- ZeroNine8
- Post #7
- Sep 18, 2005
- Forum: Ask a Technical Professional
Z
Idea to save (rebuild) the polar ice caps

The calculations are just to show what kind of energy transfer is going on. There's a lot of stuff neglected, such as the existing ice cooling the air back down and warming up by a lesser amount, etc. etc. When fractions of a degree are significant in terms of global warming, if the proposal...
- ZeroNine8
- Post #28
- Sep 18, 2005
- Forum: Ask a Technical Professional
Z
Idea to save (rebuild) the polar ice caps

There's no free lunch, and heat transfer / thermodynamics is no different. The short term result is that you would increase the amount of ice while increasing the overall temperature of the polar regions. specific heat of air at polar temperatures (250K) is 1.006 kJ/kg*K with a density of...
- ZeroNine8
- Post #26
- Sep 17, 2005
- Forum: Ask a Technical Professional
Z
phase change cooler

First, your typical water cooling setup is not designed to handle vapor, so you would have to run some pretty significant mods to get it to work. Many solvents (acetone, heptane, etc.) and some alcohols will function well as they hover around the liquid/vapor line at room/CPU heat sink temps...
- ZeroNine8
- Post #8
- Jun 26, 2005
- Forum: Ask a Technical Professional
Z
Misquito in car situation...

50mph relative to what?
- ZeroNine8
- Post #2
- Jun 22, 2005
- Forum: Ask a Technical Professional
Z
math experts needed on this problem

This sounds like something analogous to a parametric equation. If you consider your 'movements' along a number line to be the variable and your resulting equation values to be your absolute position on the number line, you could arrive at a similar situation. In this way of thinking, we can...
- ZeroNine8
- Post #11
- May 29, 2005
- Forum: Ask a Technical Professional

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