On Jun 8, 3:42 pm, 1treePetrifiedForestLane <Space...@hotmail.com> wrote: > the funny thing is that > you seem to have applied the property > of the photoelectrical effect to gross masses, > with the idea that there is a certain size > of bullet, before it will transfer energy > to the target, which is manifestly untrue > in the everyday world of stuff.
1tree: Give up on impacts between objects! There are too many variables. However, I successfully impacted a 3/8" diameter clevis pin, head-to-head with a 5/8" diameter clevis pin suspended in a rubber ring that was supported by two, small elongation springs. My KE = a/g (m) + v / 32.174 gives the velocity (and thus the height of drop) to cause the KE of the smaller pin to match the INERTIA of the larger pin. To verify that that condition has been met, I recorded the sound of the impact on voice analysis software. The small pin will make a "clunk" sound when the conditions are met, because the two pins compress together long enough to dampen the high pitched ringing sound at both slower and faster velocities. At slower velocities the inertia of the big pin rules, and the small pin bounces away quickly enough so that the ringing isn't dampened. At faster speeds, the KE of the small pin pushes the larger pin away fast enough so that the ringing isn't dampened. But at exactly the predicted velocity, the two objects remain in contact longer than the frequency of the ringing tone... which then becomes just a clunk. Since that cluck occurred at the exact height predicted by my KE equation, such is conformed by the experiment. ? NoEinstein ?
