question about the mechanism of energy conservation in free fall
From: alistair (alistair_at_goforit64.fsnet.co.uk)
Date: 06/29/04
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Date: Tue, 29 Jun 2004 21:31:26 +0000 (UTC)
TESSEL@TUM.BOT wrote:
On Mon, 14 Jun 2004, Jim Jastrzebski claimed (in s.a.r.):
> For a long time I wanted to know what is a mechanism of energy
> conservation in a free fall. It seemed that the simplest way of finding
> an answer was to ask someone on sci.physics.research but when I did by
> posting a question "where the kinetic energy of a falling brick is
> coming from", I was told by several serious scientists (I presume) that
> energy is not conserved in gravity, which I had a hard time to believe.
ALISTAIR writes:
I have a hard time believing energy isn't conserved in gravity too.
Over small time scales energy is not conserved in quantum mechanics
e.g the appearance and rapid disappearance of vacuum particles, and in
general relativity it seems energy isn't conserved over large time
scales e.g redshifted photons from galaxies.Considering theorists
are trying to unite general relativity and quantum mechanics this
mismatch between timescales in the context of the lack of energy
conservation seems odd!
[Moderator's note: Energy is conserved in quantum mechanics.
http://math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html
-TB]
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