Re: Transfering an Electrical Concept

[Bob Sciamanda <trebor@VELOCITY.NET>]

Good shot, Chuck!
Exactly this approach is exploited in standard texts on "Acoustics" (eg:
Kinsler & Frey).

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor

----- Original Message -----
From: "Chuck Britton" <britton@NCSSM.EDU>
To: <PHYS-L@lists.nau.edu>
Sent: Monday, December 18, 2000 05:44 PM
Subject: Re: Transfering an Electrical Concept


> At 10:51 AM -0600 12/17/00, brian whatcott,  you wrote about
> Transfering an Electrical Concept - matching mechanical:
>
>
> > The maximum power theorem is well known to electrical engineers.
> > It may be expressed like this:
> > Maximal power is transfered when the source impedance equals
> > the characteristic impedance of the output.
> >
> >
> > What is a reasonable explanation for the need to choose an optimal
> >  bolt mass in a crossbow for best range?
> > Impulse? Change of momentum?
>
> I had thought a bit along these lines several years ago when some
> students were designing a trebouchet but did not finalize anything.
>
> Using the analogy to the electrical case where P = IV , mechanics has
> P = F x v (velocity)
>
> Electrical impedance is V/I so I suggest that mechanical 'impedance'
> is F / v = m (a/v).
>
> I dunno if this has ANY validity, but since nobody else dove in, I
> decided to speak up.
>
> further comments would be MOST welcome.
>
>    -.     .-.     .-.     .-.     .-.     .-.     .-.     .-.     .-.
.-
>      \   /   \   /   \ N /   \ C /   \ S /   \ S /   \ M /   \   /   \
/
>       `-'     `-'     `-'     `-'     `-'     `-'     `-'     `-'
`-'
> Chuck Britton                                   Education is what is
left when
> britton@ncssm.edu                               you have forgotten
everything
> North Carolina School of Science & Math         you learned in school.
> (919) 286-3366  x224                            Albert Einstein,
1936