Re: [Phys-l] The "why" questions

[Bernard Cleyet <bernardcleyet@redshift.com>]

I think we don't need the strain gauges --    A hammer blow at the end produces an impulse which on reflection results in a perceived tone when coupled to ones ear.  (assuming correct length, modulus and specific mass).

I think the continuing force at the first end is equivalent to a beam clamped at that end.

bc

On 2010, Dec 06, , at 09:58, brian whatcott wrote:

> But since you postulate a force on a mass with some spatial extension, 
> opposed by an equal force; then I must consider the transmission time of 
> that force through the mass until an unyielding
> force opposing this transmitted force appears:  after which event, a 
> force is transmitted back to the originating force.
> The initial unbalanced force gives some compression, the opposing force 
> appears after some delta t transmission time, and the initial force is 
> in turn balanced after a further delta t for the return traversal.
>
> This does not appear entirely  fanciful. One can propose instrumenting a 
> rod with a strain gage at each end.
> The experiment avoids  easy conclusions involving  the CofM concept, as 
> it seems to me.