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Date: Sat, 29 Nov 1997 09:50:56 -0600
From: brian whatcott <inet@intellisys.net>
Subject: Re: A maximum possible acceleration ?
There is an answer as to a limiting value of x'' which you will find
disappointing:
for people exploring the possibility of storing energy in flywheels,
it is convenient to refer to a figure of merit which is applicable
to a particular material; this figure capsulates the maximal rotational
rate before a given wheel mass explosively comes apart, a specific
energy-density, so to speak. This is a 'strength of materials' issue,
and motivates the choice of wrapped carbon-fiber rather than steel.
Is there a formal limit for the second derivative of position with
respect of time somewhere ? (in general relativity? in QCD? ...).