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Mailing List Logs for ShadowRN

Message no. 1
From: dbuehrer@****.org (David Buehrer)
Subject: Movement Power in General
Date: Tue, 30 Jan 1996 14:54:58 -0700 (MST)
After reading the Movement power I find myself wondering if it can affect
anything that is moving through the terrain of the spirit/elemental. If
there's a hurrican can a Storm Spirit affect the wind? If you drop a marble
off a tall building can a force 10 air elemental increase it's terminal
velocity from 200 to 2000 miles per hour? Can the movement power be used on
projectiles to speed them up or slow them down? Or, can the power only be
used on living subjects/victims?

The rules aren't very clear (as far as I can tell :) and I would appreciate
any input.

-David

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David Buehrer
mailto:dbuehrer@****.org
http://www.geocities.com/TimesSquare/1068/homepage.html
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Message no. 2
From: t_little@**********.utas.edu.au (Timothy Little)
Subject: Re: Movement Power in General
Date: Wed, 31 Jan 1996 23:26:50 +1100
>After reading the Movement power I find myself wondering if it can affect
>anything that is moving through the terrain of the spirit/elemental. If
>there's a hurrican can a Storm Spirit affect the wind? If you drop a marble
>off a tall building can a force 10 air elemental increase it's terminal
>velocity from 200 to 2000 miles per hour?

Well, a marble probably has a terminal velocity more on the order of 30
miles an hour, and it would take about 40 km for anything to reach 2000
miles per hour.

But following the spirit (8-)) of your question, I'd say yes.

> Can the movement power be used on
>projectiles to speed them up or slow them down?

If you could get an air elemental to time the application of its power to a
projectile in flight, I'd say yes.

--
Tim Little
Message no. 3
From: neon@******.backbone.olemiss.edu (Mike Broadwater)
Subject: Re: Movement Power in General
Date: Wed, 31 Jan 1996 16:00:25 -0600
>Well, a marble probably has a terminal velocity more on the order of 30
>miles an hour,
>Tim Little
That's incorrect. I marble would most likely have a higher terminal v as it
has a smaller cross sectional area than a human, who's terminal v is roughly
120 miles an hour. Remember, mass doesn't matter when figuring the force of
gravity upon an object.

Mike Broadwater
http://www.olemiss.edu/~neon
"You only need two things in this world. WD40 to make things go, and
duct tape to make them stop."
Message no. 4
From: t_little@**********.utas.edu.au (Timothy Little)
Subject: Re: Movement Power in General
Date: Fri, 2 Feb 1996 17:05:41 +1100
>>Well, a marble probably has a terminal velocity more on the order of 30
>>miles an hour,
>>Tim Little
>That's incorrect. I marble would most likely have a higher terminal v as it
>has a smaller cross sectional area than a human, who's terminal v is roughly
>120 miles an hour. Remember, mass doesn't matter when figuring the force of
>gravity upon an object.

Mass doesn't matter when you're figuring the *acceleration* of gravity on an
object.

Mass does matter if you're comparing the gravitational *force* to the air
friction force.

Gravitational force: Fg = mass * g.
Air friction: Ff = 1/2 * air_density * frontal_area * airspeed^2. (for a
sphere under turbulent friction)

Setting the forces equal for terminal speed (Fg = Ff) and rearranging:
airspeed = sqrt( (mass * g) / (.5 * air_density * frontal_area))

Using mass = 0.0084 kg, g = 9.8 m/s^2, air_density = 1.2 kg/m^3, and
frontal_area = 0.00031 m^2, I get
airspeed ~= 21 m/s ~= 47 miles/hour. Smaller for smaller marbles,
larger for larger ones.

--
Tim Little

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