[time-nuts] FW: Pendulums & Atomic Clocks & Gravity

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed May 30 09:52:34 EDT 2007


Bill Beam wrote:
> It helps if this problem is solved in a proper (Earth based) inertial frame
> and to consider the total energy (kinetic plus potential) of the test masses.
>   

But there are no strictly inertial frames based on the Earth.
The earth rotates around its axis (neglecting precession, nutation etc), 
it also orbits the sun which in turn ...
An actual test of these predictions would be somewhat expensive to carry 
out.
The damping due to the air in the shuttle or ISS (as well as a host of 
other small effects) would tend to damp out such motion.
The question is how quickly?
> Clearly a satellite based frame is non inertial and therefore Newtons laws
> of motion are not valid.
>
> Gentlemen:  Those of you who have never taken a university physics course
> are excused for confusion over centripital/centrifugal/psudo forces.  Some of
> you who did take a university physics class spent too much time asleep in
> class.
>
> Regards,
>
> Bill Beam
> NL7F
>   





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