In article <
[email protected]>,
Joshua Steinberg <
[email protected]> wrote:
>
>Well if you'll settle for unproven formulas, I can
>make one up.
>
>Your level of training, your natural talent, your
>cardiovascular physiology, all give you the ability to pour
>out a certain amount of energy per second, minute, hour,
>etc., which is approximately the definition of power
>(energy per unit time). Careful, I'm straying from
>physiology which I know into physics which I've forgotten!
>But follow along...
That is the definition of power. Nothing approximate about
it. So far, so good.
>
>That amount of energy you can deliver for propulsion won't
>really change if you are carrying extra pounds, whether
>they are rainsoaked clothes when running during a downpour
>or 5 extra pounds of mocha-frosted chocolate brownies (back
>to the icing theme again, why miss an opportunity).
>
>Energy is proportional to mass x (velocity-squared).
>
>Increase your mass by 10%, the velocity-squared must go
>down proportionally, and the square root would give you the
>new slower velocity.
>
>What do you more sophisticated physics and athletic-
>performance types think?
>
There's some truth to it, but the effect is worse than
the energy cost of a single acceleration up to speed.
Those fat-encased body parts have to be re-accelerated on
every stride.
Also, all that adipose tissue sloshing around introduces
additional viscous drag and the layer of insulation
decreases the efficiency of the engine.
P.S. Did you do the ambulance chase (5K) today? If I may
brag, my 48 year old wife came in third -- overall. She
thought the course was short.
--
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Terry R. McConnell Mathematics/215 Carnegie/Syracuse, N.Y.
13244-1150
[email protected] 229B Physics Bldg
http://barnyard.syr.edu/~tmc
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