In article , (Gregory L. Hansen) writes:
In article ,
David M. Palmer wrote:
In article , Steve Harris
wrote:

Come on. You're like the guy who says: when I heat up an
object, its weight doesn't change (to first order).
Therefore the equivalence of mass and energy is violated.
Duh.

There is no energy cost to move the stationary sail *to
first order.* Carnot's law is broken to exactly the degree
that you simplify the problem with approximation. But don't
confuse your approximation with violation of physical law.

There is no energy cost to move the stationary sail to first order.
There is no change in photon energy to first order

There is an energy cost to move the stationary sail to second order.
There is an equal change in photon energy to second order.

There is no breaking of Carnot's law to any order.

And yet, there is an energy cost to move a stationary sail, and there is a
change in photon energy. And no matter what thermodynamics arguments are
brought up, light pressure has been used to orient satellites, there's
nothing controversial about it. Looks like someone is going to have to
figure out where their analysis went wrong.

Whose analysis? The standard one is OK. If you mena Gold's, then
figuring what went wrong is a matter for psychiatry, not physics.

Mati Meron | "When you argue with a fool,
| chances are he is doing just the same"