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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.research
Subject: Re: Equivalence principle
Date: 10 Jun 2024 11:46:37 GMT
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On 2024-06-08 17:40:15 +0000, Luigi Fortunati said:

> In the video https://www.youtube.com/watch?v=R3LjJeeae68 at minute 6:56
> it states that there is no measurement that can be made to distinguish
> whether you’re being accelerated or whether you are sitting still on the
> surface of a planet.
>
> So, I ask: what stops us from measuring the presence (or absence) of
> tidal forces? If tidal forces are there, then we are stationary on the
> surface of a planet, if they are not there, we are experiencing a
> non-gravitational acceleration.

Consider a situation where you are not sitting on a surface of a planet
but acclerated by a real non-gravitational interaction; and this happens
near a planet or a star: you can measure a tidal force (if your instruments
are big and sensitive enough).

-- 
Mikko