Re: [Phys-L] effective teaching of scaling/ratio use

["Richard Heckathorn" <geepaw@wowway.com>]

Thanks much

Dick

Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn  14665 Pawnee Trail  Middleburg Hts, OH  44130  440-710-4941
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Retired Physics Teacher - Wharton, Midpark, Cuyahoga  Valley Christian High
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                                       Baldwin Wallace Univ and Merchant
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-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of Bernard
Cleyet
Sent: Sunday, December 21, 2014 6:55 PM
To: Phys-L@Phys-L.org
Cc: Watkins, Ann E
Subject: Re: [Phys-L] effective teaching of scaling/ratio use


On 2014, Dec 20, , at 10:15, Richard Heckathorn <geepaw@wowway.com> wrote:

> Greetings, I have been told that a two-year-old, when an adult, has
increased by an approximate scale value of two.  If one takes this as a
starting point, then all areas increase by two squared or four times, and
all volumes and weight increases by two cubed or eight times.
> Have a Great Day
>
> Website rheckathorn.weebly.com


This explains why one (who?) has recommended the BMI is inaccurate, because
its scale is square instead of cube.

bc has too large a BMI.  


Note: The SI BMI is only mass * height^2.  (kg*m^2)  

p.s.  I suggest this formula:   mass /  height^3   times a factor that
results with the ideal weight (mass) being 1 (kg/m^2)    

A stats? exercise:  Does this formula work for all peoples' ages?  

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