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RE: Propellant fluid dynamics at zero-g

> I don't believe in centripetal or centrifugal force.  Any 
> good Physics text will
> give the arguments more clearly than I intend to here.  To 
> prove it one way or
> the other try this experiment:  While whirling a ball (or 
> other small mass) on a
> string around you.  Let go of the string.  Which way does the 
> ball go?  Don't do
> this in a china shop!

Centripetal force is you holding the string. :-) That's the only real force
in this scenario.  And as you have proven, without centripetal force, the
ball flies off in a straight line at the tangential velocity (of the moment
the string was let go).
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