Invisible <voi### [at] devnull> wrote:
> Helicopters hover by expending vast amounts of energy per second. This 
> levitating magnet appears to expend no energy at all.

  In the same way as an object on a table seems to be "expending no energy
at all" to stop it from falling through the table, or a boat on water seems
to likewise be "expending no energy at all" to stop it from sinking to the
bottom.

  The four fundamental interactions work like that.

-- 
                                                          - Warp

Post a reply to this message