Re: some calculations

[Alexei M Voloshin <Alexei.M.Voloshin-1@tc.umn.edu>]

On Tue, 13 Aug 1996, Withu Ruksvanichpongs wrote:

> > Hmm, lets count the units on the left side of the equation:
> > 
> > power:  work/time = mass * length * length / time / time
> > 
> > the right side:
> > 
> > Cd = no units
> > Area = length * length
> > V = length /time
> > 
> > Cd * Area * V * V * V = length * length * length *length * length / time
> > /time /time
> > 
> > The units on the right side don't match the units on the left side!!!!
> > Either your equation is invalid or you're not telling the whole story??!!!
> > 
> > Alex	The left side units should be.
> 	P=mass*length*length/time/time/time
> 	P=W/t =FV 
> 	;F=ma
> 	;a=s/t^2
> 	;v=s/t
> 	
>   OK,the article explain 8.702E-6 as a correction factor for air density
> ,gravity,rolling resisteance,etc. it may have unit,but they didn't write
> about it.
> 

Have you tried it??

Also, you mentioned that V is in MPH, what are units of frontal area?
Also does the article mention in what range of speed and power is the 
fromula most accurate??

Alex