On Fri, 3 Jul 2009, Stephen A. Lawrence wrote: > No, the force should have been the same in each trial. Think about what > you've got. > > If each layer is behaving elastically, then the question you need to ask > is, what force is needed to compress 1 layer to 1/2 its thickness? Call > that force "F".
Nah, the stuff is really rigid, and the stack visibly remains flat when squeezed. (That's probably a good clue that there were no air layers in the first place!) It's probably the plastic case connected to the micrometer jaw that's flexing, see http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47257 Wow, they're down to $10 each! They originally were $50 a few years back. They have a serial port under a little door, but it's not a listed feature, so it might not be alive. (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) William J. Beaty SCIENCE HOBBYIST website billb at amasci com http://amasci.com EE/programmer/sci-exhibits amateur science, hobby projects, sci fair Seattle, WA 206-762-3818 unusual phenomena, tesla coils, weird sci
