"Doug Wedel" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
Let's assume you wanted the kinetic energy, and there was no sort
of temperature change you were interested in too:
KE = 1/2 * m * v^2
KE = 0.5 ( volume_of_tunnel * density ) * velocity^2
Get volume in m^3, density is usually something like 1.295 kg/m^3
at STP, and once you tell me what "200 km" is, I might be able to
help with getting a velocity in meter / sec. Note that you could
end up with units of energy per meter of tunnel length, if you
Energy is units of joules typically. Could do something like
foot pounds if you were of a mind to.