Physicist Richard Feynman wondered what would happen if an S-shaped lawn sprinkler, which rotates as water squirts out, were placed underwater and had its flow direction reversed, so that it sucked water in. Which direction would it rotate? Experiments have given conflicting answers, but now researchers have provided what appears to be a definitive resolution. When sucking water in, the sprinkler reverses its rotational direction, and the motion is unsteady and much slower. The explanation involves the details of fluid flow in the sprinkler geometry. ... read full post

cross-posted from: https://mander.xyz/post/9079658
Sauce: https://mastodon.social/@gutenberg_org/111845638304911489
Is it possible to determine the percentage of the gravitational force at a specified distance using only the geometry of the planet?
Example: The ISS at ~420km altitude "weighs" about 90% of what it would on the Earth's surface.
Is there an equation using only geometrical values that would give you this info?
cross-posted from: https://slrpnk.net/post/5710029 ... read full post
A proposed model unites quantum theory with classical gravity by assuming that states evolve in a probabilistic way, like a game of chance.