Tag

Angular Momentum

All articles tagged with #angular momentum

science27 days ago•51 min saved

Seven quirky sprinklers upend Feynman and Mach on reverse sprayers

New York University researchers tested seven deliberately odd “silly” sprinkler designs to pit Mach’s angular-momentum idea against Feynman’s suction-based theory. Across all designs, rotation depended on the sprinkler’s central hub where the arms meet, not on how water carried momentum inside the arms or on nozzle geometry. The results debunk both classical explanations and suggest a unified view: the hub’s dynamics govern the spin. This insight could inform engineering designs that convert fluid flow into rotation, with potential applications for turbines and energy-harvesting devices.

via Yahoo|

#angular-momentum #ernst-mach #feynman

space2 months ago•11 min saved

Moon's Gentle Tug Lengthens Earth's Day, Not a Heist

Earth’s rotation is slowing due to tidal interactions with the Moon, lengthening the day while the Moon slowly drifts outward at about 3.8 cm per year. The transfer conserves angular momentum, so nothing is stolen—past days were shorter, with a lengthy pause around 19 hours for roughly a billion years before the gradual increase resumed. The present rate and historical timeline vary with continental configurations and tidal dynamics.

via Space Daily|

#angular-momentum #earth #lunar-recession

science3 months ago•7 min saved

Crystal Lattice Spins Backward: Quantum Angular Momentum Reversal Revealed

Researchers used terahertz laser pulses to drive circular lattice vibrations in a crystal and tracked how angular momentum transfers between vibrational modes; during the transfer the rotation can flip direction due to the lattice’s rotational symmetry, offering a direct quantum signature of angular momentum conservation with potential implications for magnetism and ultrafast control of quantum materials.

via SciTechDaily|

#angular-momentum #crystal-symmetry #lattice-vibrations

astronomy6 months ago•6 min saved

Giant Rotating Cosmic Filament Rewrites How Galaxies Get Their Spin

An Oxford-led team identifies a giant, razor-thin cosmic filament about 140 million light-years away that is rotating with galaxies aligned to its spin, offering new insights into how galaxies acquire angular momentum and evolve. The finding, enabled by MeerKAT’s MIGHTEE survey and complemented by DESI and SDSS data, challenges existing models of galaxy formation within the cosmic web.

via The Daily Galaxy|

#angular-momentum #astronomy #cosmic-filaments

science1 year ago•3 min saved

Scientists Confirm Fundamental Quantum Rule for the First Time

Researchers have experimentally confirmed that angular momentum is conserved when a single photon splits into a pair, validating a fundamental quantum principle and paving the way for advanced quantum states useful in computing and communication.

via ScienceDaily|

#angular-momentum #photon-entanglement #quantum-computing

physics2 years ago•4 min saved

"Chiral Electron Paths: A Twist in Physics Revolutionizing Technology"

Researchers in Germany have successfully sent single electrons along structured chiral paths, achieving chirality in electron matter waves without angular momentum. This work, which parallels earlier research with photons, could have significant applications in electron microscopy and the study of magnetic materials. However, some scientists are skeptical about the claim of chirality without angular momentum and the lack of citation of previous related work.

via physicsworld.com|

#angular-momentum #chirality #electron-microscopy