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At 10:51 AM -0600 12/17/00, brian whatcott, you wrote
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.
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).
Chuck Britton