From: utzoo!decvax!cca!hplabs!hao!menlo70!sytek!zehntel!beta!berry@sri-unix Newsgroups: net.physics Title: Re: one little gripe - (nf) Article-I.D.: zehntel.408 Posted: Tue Sep 7 13:21:34 1982 Received: Thu Sep 16 02:26:19 1982 #R:unc:-386000:beta:11600001:000:220 beta!berry Sep 1 09:35:00 1982 My physics text says that "rest mass" is the apparent mass of an object at rest with respect to the observer. It's that simple