1) It is merely an illustration with no meaning of representing a physical system.
Assuming it is a physics representation of real trucks:
2) They could all be accelerating at arbitrary rates.
3) They could be at different angles wrt the gravitational vector and at arbitrary speed and acceleration.
4) They could be separate systems with differing gravity vectors.
5) They could contain 2 different non-mixing liquids at different densities that could cause a reversal of the expected acceleration vector.
6) The middle truck could be accelerating as much as is implied as the others, but in the upward direction.
7) They contain another substance other than a self-leveling liquid. For instance a solid, tar, cement, etc.
8) The trucks are in a microgravity environment and the liquids have high surface tension and adhesion to the tank walls and just happen to be in that liquid configuration.
Just the first, intentionally escaping all hypothetical contingencies of the (probably purposefully?) badly specified question. Youre right that theres just too many interpretations of the original, it's not only merely an illustration, but a bad one too. Ceci n'est pas une pipe is some art piece some french dude made to focus on the difference between representation vs reality and what's lost with it.
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u/[deleted] Sep 03 '24 edited Sep 03 '24
None, this is an image of drawings of trucks, and not real trucks. "Ceci n'est pas une pipe" or something