> You attach the object to a spring that has another mass at the > other end and you exicte a harmonic oscillation in the system. > One period is enough to find out what you want to know. > > Peter So that's similar to perturbations you'd observe between stellar objects -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body