Re: List Reborn

From: <Christopher>
Date: Thu Oct 20 2005 - 00:09:00 EDT

On Oct 19, 2005, at 10:14 PM, <Mechproj@xtra.co.nz> wrote:

> your comments treat speed the same as velocity. Velocity has a
> magnitude and a direction. If you change the direction, you change the
> velocity, but not necessarily the speed.
Presumably you're referring to speed as the magnitude of the velocity vector. The relationship and the underlying physics still holds. The change in momentum doesn't equal the change in energy, as we agreed, because momentum can't equal energy. But the change in speed (or mass) which causes a change in momentum also causes the kinetic energy to change. That's because kinetic energy equals half the momentum times the speed. If you change the momentum the kinetic energy inescapably changes.
Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=39cxYT9VxQU-zRPM7ihK_E47l2rpaKFpKiSz3CrAC_Vrw_AJKqxjROOMH9GqpIpqaL2JFuPKPX9sldz7DA">chrisw@skypoint.com</a> | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania

1864)
<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a> Received on Thu Oct 20 00:09:00 2005