On 12/12/2011 1:19:31 PM, Magnus Danielson ([email protected]) wrote: > 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.
For a spherical homogenious mass of radius R; g goes as r^+1 for r<R and as r^-2 for r>R. (This is a freshman undergraduate Physics problem.) Bill > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time- > nuts > and follow the instructions there. Bill Beam NL7F _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
