[opendtv] Re: Mag-lev

  • From: Morris Jones <mojo@xxxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Tue, 31 Oct 2006 09:25:42 -0800

Tom Barry wrote:

The solution my dad always wanted was to put the maglev's in u shaped tunnels and operate them like roller coasters. They would gradually fall down the tunnel and then coast mostly up the other side, slowing as they arrived. Motors would only be used to compensate for friction or differences in altitude.

I recall a school physics puzzle in which we were asked to prove that if you drilled a straight line through the earth between any two points, you could operate a frictionless train using only gravity. The tunnels wouldn't actually be U-shaped, but straight lines bypassing the spherical surface geometry. Cute thought.

My intuition also tells me that the trip time for such a train would be identical between any origin and destination. But I've not done the math.

Morris Jones
Monrovia, CA
Old Town Astronomers http://www.otastro.org

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