Re: Inertial-dampening systems

From: Gregory L. Hansen (glhansen_at_steel.ucs.indiana.edu)
Date: 02/05/05 

Date: Sat, 5 Feb 2005 02:04:35 +0000 (UTC)

In article <1107556776.915200.135960@c13g2000cwb.googlegroups.com>,
 <msadkins04@yahoo.com> wrote:
>
>Gregory L. Hansen wrote:
>> In article <1107471820.508546.211180@g14g2000cwa.googlegroups.com>,
>> <msadkins04@yahoo.com> wrote:
>> >
>> >Gregory L. Hansen wrote:

>The balloon is lighter than air. The human integument is not an
>eggshell, and does not share the crush resistant properties derived
>from its shape and substance. What happens to the inside of the egg?
>Scrambled eggs. The hypothetical oxygenated fluid must transfer the

Why don't you try it and find out? Shake a raw egg as hard as you can,
until your arm is tired. Then carefully crack it open and see if the yoke
is still intact.

>> Good gravy, man, throw some numbers at it!
>
>This reminds me of a Dilbert cartoon. "The only way to make decisions
>is to pull numbers out of the air, call them assumptions, calculate the
>net present value. Of course, you have to choose the right discount
>rate, otherwise it's all nonsense."

Throw your own numbers at it then.

>
>> And I'm getting around ten millivolts in the frog if a 16 tesla field
>
>> turns on in one second.
>
>Why one second? Didn't you know that magnetic fields propagate with
>the speed of light? A frog starts out in an environment with an

Because the time it takes for the current in that magnet to get up to its
operating level is greater than zero. There's a helluva lot of energy in
the field of a 16 tesla magnet; turning it on or off is not like switching
a flashlight. I thought I was being generous by letting it energize in
one second, I'd expect closer to a minute depending on the inductance and
the power supply.

The speed of propagation of the field is fast enough that it's
quasi-stationary. Otherwise you'd have seen me throw a wave equation at
the problem.

>magnetic field to travel the length of the frog's body. At the speed
>of light, that's considerably less than 1 second. Now throw your
>numbers again, and explain why the frog isn't electrocuted. (Hint: the
>circulation of currents in the frog depend upon the magnetizability of
>the frog, and M = kB, where k is very small. The induced magnetic
>field in the frog is about 2 gauss. The current circulating is about 2
>amps. But the current is circular, atomic, and non-dissipative. See
>my previous comments.

I wasn't talking about an effective surface currect due to electrons
orbiting their nuclei. I was talking about the bulk motion of electrons
through a conducting medium. I don't know the electrical conductivity of
a human or a frog, but I thought the voltages induced told the story well
enough on their own. 

-- 
"Not that there's anything wrong with just lying around on your back.  In 
its way, rotting is interesing too... It's just that there are other ways 
to spend your time as a cadaver."  -- Mary Roach, "Stiff", 2003.

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