Re: impulse/momentum

[Chuck Britton <britton@NCSSM.EDU>]

and it's a fine method/approximation for understanding 'thrust
reversers' used on many airplanes these days.



At 6:50 AM -0600 12/12/03,  Brian Whatcott wrote:
>  >"speed of the water is v, both before and after"  Wow. Very strange water.
> > Jim Green
>
>
> Jim notwithstanding, if we accept speed as a scalar and velocity as a vector,
> which (despite list misgivings) is often  allowed to take negative values in
> one dimension, then specifying an eastward speed 'x' as a velocity of x1
> and a westward speed of 'x' as a velocity of -x1  leads to a change
> of velocity
>   given by the difference of the velocities, or  x - -x = 2x
>
> This does not seem to be specially controversial.
>
>
> Brian Whatcott    Altus OK    Eureka!


--
Chuck Britton                                   Education is what is left when
britton@ncssm.edu                       you have forgotten everything
North Carolina School of Science & Math         you learned in school.
(919) 416-2762                                  Albert Einstein,        1936