[SGVLUG] OT: Hybrid efficiency (was:New Linux Lug)

[Dustin Laurence]

On Mon, Feb 20, 2006 at 08:00:35PM -0800, Dustin Laurence wrote:

> No, quite the opposite, and one derivation is a simple but somewhat
> tedious high-school level exercise.  For simplicity consider driving at
> each of two velocities u and v for a distance s and compare it with
> driving at the average speed w for a distance 2s.  We want to take the
> same time to go the total distance 2s in each case, so we have uv 2s/w =
> s/u + s/v --> 1/u + 1/v = 2/w or w = 2 ----- v + u

I don't know what happened there.  It should read

                                                uv
s/u + s/v = 2s/w --> 1/u + 1/v = 2/w <--> w = 2 ---
                                                v+u

Dustin