Re: squash ball question

["Bernard G. Cleyet & Nancy Ann Seese" <georgeann@REDSHIFT.COM>]

I'm surprised no one has mentioned the Firestone tyres.  According to my
memory.  The SUV's are unstable (roll-over) when using fully inflated tyres (30
psi).  So Ford (or who ever) recommended using sl. lower p.  This caused
overheating (see below) and resulted in the scab "glued" camel backing
separating from the casing.  Resulting in some roll overs (law of unintended
consequences, irony)  -- (another one: scab labor = shoddy product)

bc

P.s.  Some rubbers contract and have greater modulus (counter intuitive) when
heated - H.S. expts.  find spring constant of rubber band at various temp.
(indirect method: freq. of spring oscillator)

P.p.s. It was fun for this labor guy to read about two ceo types duking it up
over this.

cliff parker wrote:

> I have a different take on this one.
>
> Once again neglecting any changes in the rubber, the lower the
> temperature, the lower the pressure in the ball, and correspondingly,
> the larger the distortion of the ball on bouncing.  The larger the
> distortion, the larger the dissipation in the rubber.  I agree there
> should be no dissipation of energy in the gas.  Thus, the lower the
> temperature, the larger the dissipation in the ball on bouncing.
> That is the long and short of it, more or less.
>
> Sorry, It is past my bedtime and I couldn't resist.
>
> Cliff
>
> Leigh Palmer wrote:
>
> > Qualitatively:
> >
> > Neglecting any changes in the rubber, the higher the temperature,
> > the higher the pressure in the ball, and correspondingly, the
> > smaller the distortion of the ball on bouncing. The smaller the
> > distortion, the smaller the dissipation in the rubber. There
> > should be no dissipation of energy in the gas. Thus, the higher
> > the temperature, the smaller the dissipation in the ball on
> > bouncing.
> >
> > Leigh
>
> --
> Cliff Parker
>
> Never express yourself more clearly than you can think.  --  Niels
> Bohr