In reply to David Roberson's message of Tue, 15 Mar 2016 11:19:13 -0400: Hi, [snip] >When might somehow be important but if you take the process to the extreme you >get a result that doesn't make any sense. For example, if the spaceship >continues to use up its mass in a constant acceleration process that requires >power and thus energy to be expended for the drive, then eventually there will >be no mass left at all. All of the original mass is lost if this takes place. > That does not make sense.
The process stops, when all the mass has been converted into kinetic energy. The only thing I know of that only has kinetic energy and no mass is EM radiation. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html