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From: bertietaylor@myyahoo.com (bertietaylor)
Newsgroups: sci.physics.relativity
Subject: Re: On Arindam Banerjee's recoil-less rail gun and Newton's 3rd Law
 violations in electrodynamics
Date: Tue, 7 May 2024 00:04:12 +0000
Organization: novaBBS
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J. J. Lodder wrote:

> Aether Regained <AetherRegaind@invalid.com> wrote:

>> bertietaylor wrote:
>> >
>> >> Volney wrote:
>> >>
>> >> Even solar sails use that effect (momentum of sunlight).
>> >
>> > No that is a heat engine. Temperature differences on either side cause
>> > the motion. Radiant heat is em waves raising the temperature on one side,
>> > that facing the sun.
>> >
>> 
>> @bertietaylor a.k.a @ArindamBanerjee,
>> 
>> You are confusing the action of the Crookes' radiometer with Nichols'
>> radiometer.
>> 
>> https://en.wikipedia.org/wiki/Crookes_radiometer
>> 
>> Crookes' radiometer is a heat engine that uses a light source as the
>> source of (radiant) heat, and a working substance, air.
>> 
>> https://en.wikipedia.org/wiki/Nichols_radiometer
>> 
>> Nichols' radiometer measures radiation pressure caused by light
>> momentum. The concept of photons are not required to explain this
>> momentum, Maxwell's wave theory is sufficient.
>> 
>> https://en.wikipedia.org/wiki/Radiation_pressure

> Nichols' radiometer is a heat engine too.
> Its heatsink is either the walls of the room,
> or ultimately, if you go outside,
> the cosmic background radiation,

> Jan

The CBR is the radiation from all the stars and galaxies. Radiation provides no monentum for radiation has no mass. Momentum is mass multiplied by velocity. No mass, no momentum. But there us APPEARANCE of momentum with solar sails in sunlight.

bt