[time-nuts] gravity controlled pendulumn clock?
magnus at rubidium.dyndns.org
Mon Dec 12 17:19:31 EST 2011
On 12/12/2011 01:37 AM, Jim Lux wrote:
> On 12/11/11 4:04 PM, Tom Van Baak wrote:
>> GCPC -- gravity controlled pendulum clock (elevation)
> intriguing. From your parenthetical remark, I'm assuming you move the
> whole assembly up and down to adjust the speed?
> I was thinking about a huge mass that moves around?
> let's see.. period is proportional to sqrt(1/g)
> g is proportional to 1/r^2, so period is proportional to r.
> Earth is roughly 7000 km radius, so moving it 1 meter higher or lower
> changes the period by 1part in 7million... interesting.
Hmm... how does the near-field gravitational pull behave?
The far-field is surely r^-2, but wonder about the near-field effect.
Need to grab some paper and pen and convince myself.
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