Re: [math-fun] 11,373,076:1 gear train
On 2015-07-07 14:26, Richard Fateman wrote:
There is a gear train in the SF exploratorium with a motor going 200rpm on one end and the far end has a gear embedded in concrete. The last gear will rotate once in, what, a trillion years... RJF How many megatons if it actually stored all the energy from that motor?
http://www.exploratorium.edu/arts/works/machine-concrete emanating from http://www.chadweisshaar.com/blog/2013/03/26/trip-to-boston/ --rwg
Suppose a polynomial P_g(x,y,z) in the x, y, z coordinates of 3-space is such that the locus Z(P_g) := {(x,y,z) in R^3 | P_g(x,y,z) = 0} is topologically the compact surface of genus g. PUZZLE: ------- What is the lowest possible degree D(g) of P_g ??? Give an example. —Dan
Or, more likely, the teeth will be stripped off the final gears. -- Gene From: rwg <rwg@sdf.org> To: Richard Fateman <fateman@berkeley.edu> Cc: math-fun@mailman.xmission.com Sent: Tuesday, July 7, 2015 4:25 PM Subject: Re: [math-fun] 11,373,076:1 gear train On 2015-07-07 14:26, Richard Fateman wrote:
There is a gear train in the SF exploratorium with a motor going 200rpm on one end and the far end has a gear embedded in concrete. The last gear will rotate once in, what, a trillion years... RJF How many megatons if it actually stored all the energy from that motor?
http://www.exploratorium.edu/arts/works/machine-concrete emanating from http://www.chadweisshaar.com/blog/2013/03/26/trip-to-boston/ --rwg
participants (3)
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Dan Asimov -
Eugene Salamin -
rwg