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#physics

59 posts53 participants7 posts today
Public
The Kid Should See This 🌈🪐✨

💁🏻‍♀️ ICYMI: Mathematician Hannah Fry's performs a #physics demonstration with thread and bricks! This elegant experiment shows how the same number of threads can either fail catastrophically or support heavy loads, depending on one simple factor. The #video explains the #engineering that keeps elevators safely suspended and bridges standing. 🧵🧱

👉 Learn more: thekidshouldseethis.com/post/h

A woman with red hair holds strands of rope during a physics demonstration exploring the strength of twisted threads.
#science#STEM#tksst
Public
franco_vazza

It's the time of the year in which I challenge my students of #physics in engineering in producing a "tomato battery", i.e. to reproduce on stage the basic functioning principle of a galvanic cell: a pair of suitable metals, an acid solution, and some connecting wires.

"one tomato" battery is not enough to generate the 1.5V tension needed for the small digital clock, so they have to realise a serie of two tomato batteries is needed.

#astrodon#astronomy#science
Public
Rxiv mechanobio

📰 "The role of hydrodynamics in the synchronisation of {\it Chlamydomonas} flagella"
arxiv.org/abs/2504.02680 #Physics.Bio-Ph #Mechanical #Q-Bio.Cb #Cell

arXiv logo
arXiv.orgThe role of hydrodynamics in the synchronisation of {\it Chlamydomonas} flagellaWhile hydrodynamic coupling has long been considered essential for synchronisation of eukaryotic flagella, recent experiments on the unicellular biflagellate model organism {\it Chlamydomonas} demonstrate that -- at the single cell level -- intracellular mechanical coupling is necessary for coordination. It is therefore unclear what role, if any, hydrodynamic forces actually play in the synchronisation of multiple flagella within individual cells, arguably the building block of large scale coordination. Here we address this question experimentally by transiently blocking hydrodynamic coupling between the two flagella of single {\it Chlamydomonas}. Our results reveal that in wild type cells intracellularly-mediated forces are necessary and sufficient for flagellar synchronisation, with hydrodynamic coupling causing minimal changes in flagellar dynamics. However, fluid-mediated ciliary coupling is responsible for the extended periods of anti-phase synchronisation observed in a mutant with weaker intracellular coupling. At the single-cell level, therefore, flagellar coordination depends on a subtle balance between intracellular and extracellular forces.
Public
The Kid Should See This 🌈🪐✨

Mathematician Hannah Fry's performs a #physics demonstration with thread and bricks! This elegant experiment shows how the same number of threads can either fail catastrophically or support heavy loads, depending on one simple factor. The #video explains the #engineering that keeps elevators safely suspended and bridges standing. 🧵🧱

👉 Learn more: thekidshouldseethis.com/post/h

Alt text: A woman with red hair holds strands of rope during a physics demonstration exploring the strength of twisted threads.
#science#STEM#tksst
Public *
🇨🇦 Michael Porter 🇨🇦

Mastodon! I'm delivering a talk to a couple of grade 9 classes in a month on the use of space (mainly satellites, but probes to other planets, comets, etc., will be included).

How does your work benefit from satellites?

I'm thinking of a direct use of the data, as opposed to stuff like “internet access” or “my bank relies on satellites to transfer my grant money from one account to another” 😄

Anecdotes, rants, personal stories are all fair game 😊
(To the inevitable suggestion that I just Google this, yes, I can, and have, but I want the human element - I want to be able to say "someone I ‘know’ uses satellites for their job, and this is what they like about the tech”)

Hashtag suggestions are welcome.
(Also - question: Does Mastodon discriminate hashtags with different capitalization? Are #Astronomy and #astronomy functionally different? We *really* need some kind of ISO standard 😉)

#Archaeology #Physics #SolarActivity #Geology #SevereWeather #Climate #ClimateChange
#Satellite #Satellites #Agriculture #oceanography

Public
Mikko Tuomi

An interdisciplinary team of researchers has proposed nothing less than a new law of #nature, according to which the #complexity of entities in the #universe increases over time with an inexorability comparable to the second law of #thermodynamics — the law that dictates an inevitable rise in entropy, a measure of disorder.

If they’re right, complex and intelligent #life should be widespread.

#astrobiology #physics
quantamagazine.org/why-everyth

Quanta Magazine · Why Everything in the Universe Turns More Complex | Quanta MagazineA new suggestion that complexity increases over time, not just in living organisms but in the nonliving world, promises to rewrite notions of time and evolution.
Public
NinjaZ

Scientists discover a new phase of matter that's 'half ice, half fire'

infosec.pub/post/25998815

infosec.pubScientists discover a new phase of matter that's 'half ice, half fire' - Infosec.PubPhysicists have discovered a new phase of matter, dubbed “half ice, half fire,” that could open the door to new advancements in fields such as quantum computing. The new phase combines a number of “up” spins of electrons within an atom, which are highly ordered and referred to as cold cycles, with a number of “down” spins, which are highly disordered and referred to as hot cycles — lending the phase its nickname, “half ice, half fire.” “Half ice, half fire” is a significant discovery not only because of its novelty but also because it can produce sharp switching between phases at reasonable temperatures. It’s the twin of the “half fire, half ice” state first observed by the same team at Brookhaven National Laboratory — physicists Weiguo Yin and Alexei Tsvelik, alongside their then intern, Christopher Roth — back in 2016. These discoveries provide insight into some of the central questions in physics and the materials sciences, according to the team, as well as advance the ability to identify new states of matter with exotic properties and manipulate the transition between those states.
#physics
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