Physics
- Automatic Balancing Ballsimgur.com Balance Balls
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I learned this week that many high speed CD-ROM drives used balancing balls on the spindle to stop discs from vibrating at 10Krpm.
Between the platter that supports the CD and the motor there is a puck with a toroidal void containing a few ball bearings. When an out of balance CD is spun up the spindle and disc together rotate around their common center of mass, some point between the spindle and the edge of the disk. This means that the void containing the balls no longer rotates around it's center, it spins like a hula-hoop around the spindle/DC center of mass. With the "lighter" side of the system being farther from the center of rotation the balls roll 'down hill' towards the side of the void that is experiencing more centrifugal force. Eventually enough balls will collect on the light side to perfectly cancel out the heavy side. If there are too many balls they will distribute themselves inside the void until they cancel out each other's weight!
The link leads to a scaled up demo of this using an empty water bottle and steel BBs.
- Where do particles come from? - Sixty Symbols
I must admit that the details of how the fields are coupled went over my head, but I found the rest of the video quite accessible. Professor Copeland is a joy to listen to, and Brady asks great questions as usual.
I also learned that "inflation" and "the big bang" are not synonymous, and inflation occurred first.
- The Physics of Breakdancing, a New Olympic Sportwww.scientificamerican.com The Physics of Breakdancing, a New Olympic Sport
Breakdancing will hit the global stage at the 2024 Summer Olympic Games in Paris, and this physicist is excited to break down the science
- Reflecting on a Pivotal Physics Calculationwww.caltech.edu Reflecting on a Pivotal Physics Calculation
A Q&A with physicist David Politzer about solving the mystery of the strong force more than 50 years ago.
- A question for the Physics communities
I think I need to rephrase the question. I'll post again in a few days.
The replies so far have generally been very polite, given the subject. I was nervous about that. Thanks everyone!
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... Hear me out, okay?
Back in 2000 I took my first solo, out of state trip, to meet an online friend. When I got off the bus, she greeted me, and let me know that we had to go stop by her friends house on the way back.
She was Wiccan and needed some Spiritual guidance because the night before she saw a black portal open up in the corner of her room that was giving her really bad vibes.
It wasn't my thing, but I never discounted it. Maybe it was real, and if nothing else it's just how her mind is rationalizing things.
But I guess my question is: Does the Scientific Method rule out the possibility that a "real" portal appeared in her room?
Taking wave function probability into account and the absense of data from the room, is it fair to say that the scientific method doesn't rule out the black portal being real?
Looking for black and white answers if possible, but I'd also love to hear your reasoning~
- Physicists Observe Rare Nuclear Decay of Potassium Isotope | Sci.Newswww.sci.news Physicists Observe Rare Nuclear Decay of Potassium Isotope | Sci.News
Physicists with the Potassium Decay (KDK) Collaboration have made the first direct observations of a very rare but critical decay path of potassium-40 to argon-40.
- Why You Can Hear the Temperature of Waterwww.nytimes.com Why You Can Hear the Temperature of Water
A science video maker in China couldn’t find a good explanation for why hot and cold water sound different, so he did his own research and published it.
- DIY Paul Ion (Particle) Trap [oc]
The two hemispheres are electrically connected to each other and to an AC power supply, the ring is connected to the same AC supply but 180 degrees out of phase. Particles are charged and then injected into the trap, they are then alternately attracted to the ring and hemispheres causing them to oscillate and become trapped! As the voltage is increased lighter particles pick up more speed until they are finally thrown free from the trap. In ideal conditions ions are all charged the same amount allowing the trap to sort the ions from lightest to heaviest, allowing you to determine the atoms that make up a particular substance.
In this model I can not control the charge on the particles but it is possible to roughly sort them from smallest to largest.
Notes: This trap is scaled WAY up, the ring had a diameter of about 24mm. I'm trapping non-dairy creamer not individual ions. The frequency this trap runs at is WAY lower frequency than that of a real ion trap. This trap runs at a much higher voltage than a real trap. Otherwise them mechanism of operation is identical to the real thing.
- Single atoms captured morphing into quantum waves in startling imagewww.newscientist.com Single atoms captured morphing into quantum waves in startling image
In the 1920s, Erwin Schrödinger wrote an equation that predicts how particles-turned-waves should behave. Now, researchers are perfectly recreating those predictions in the lab
- Does light itself truly have an infinite lifetime?bigthink.com Does light itself truly have an infinite lifetime?
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
- Do particles get mass from the higgs field by moving through a higher dimension?
So, I watched The Higgs Field, explained - Don Lincoln and there it explains that particles are massless and it is only through their interaction with the Higg's field that they gain mass. However, how are they "moving" through the Higg's field? Is it through a movement in the 3rd dimension or a dimension above?
And related, does the movement through the Higg's field generate gravitons that affect particles they interact with by "pulling" them in the opposite direction of which they were traveling?
- Peter Higgs, physicist who theorised Higgs boson, dies aged 94www.bbc.com Peter Higgs, physicist who theorised Higgs boson, dies aged 94
The renowned scientist won the Nobel Prize for Physics in 2013.
- Quantum Weirdness in New Strange Metals Bends the Rules of Physicswww.scientificamerican.com Quantum Weirdness in New Strange Metals Bends the Rules of Physics
Electrons swarm in a soup of quantum entanglement in a new class of materials called strange metals
- Swirling Forces, Crushing Pressures Measured in the Proton | Quanta Magazinewww.quantamagazine.org Swirling Forces, Crushing Pressures Measured in the Proton | Quanta Magazine
Long-anticipated experiments that use light to mimic gravity are revealing the distribution of energies, forces and pressures inside a subatomic particle for the first time.
- When Bose wrote to Einstein: the power of diverse thinking – Physics Worldphysicsworld.com When Bose wrote to Einstein: the power of diverse thinking – Physics World
Robert P Crease and Gino Elia celebrate the centenary of the prediction of Bose–Einstein condensation
- A Short Note on the Double-Slit Experiment and Other Quantum Interference Effects in the Wolfram Model—Wolfram Physics Bulletinswww.wolframphysics.org A Short Note on the Double-Slit Experiment and Other Quantum Interference Effects in the Wolfram Model—Wolfram Physics Bulletins
New discoveries in livestreams and working sessions from Stephen Wolfram's project to discover the fundamental theory of physics.
- Room-temperature quantum optomechanics using an ultralow noise cavity - Naturewww.nature.com Room-temperature quantum optomechanics using an ultralow noise cavity - Nature
A room-temperature demonstration of optomechanical squeezing of light and measurement of mechanical motion approaching the Heisenberg limit using a phononic-engineered membrane-in-the-middle cavity with ultralow noise.
- A Quantum Trick Implied Eternal Stability. Now It’s Falling Apart. | Quanta Magazinewww.quantamagazine.org A Quantum Trick Implied Eternal Stability. Now It’s Falling Apart. | Quanta Magazine
A series of advances seemed to promise the impossible: the existence of quantum states that would never, ever fall into disarray. But physicists are now discovering that the pull of disorder may not be so easily overcome.
- ‘Entropy Bagels’ and Other Complex Structures Emerge From Simple Rules | Quanta Magazinewww.quantamagazine.org ‘Entropy Bagels’ and Other Complex Structures Emerge From Simple Rules | Quanta Magazine
Simple rules in simple settings continue to puzzle mathematicians, even as they devise intricate tools to analyze them.
- The Wild Story Of David Hahn, The 'Radioactive Boy Scout' Who Tried To Build A Nuclear Reactor In His Backyardallthatsinteresting.com The Wild Story Of David Hahn, The 'Radioactive Boy Scout' Who Tried To Build A Nuclear Reactor In His Backyard
He had a fascination with science from a young age — but he took it too far when he tried to earn his Atomic Energy badge.
- SETI, artificial intelligence, and existential projectionpubs.aip.org SETI, artificial intelligence, and existential projection
SETI’s birth during the Cold War may have prompted consideration of existential threats to humanity and proposals for using nuclear bombs to communicate with ex
- Indigenous women find their stride in physics | Los Alamos National Laboratorydiscover.lanl.gov Page Not Found | Los Alamos National Laboratory
Explore everything Los Alamos is doing
- Energy based on power of stars is step closer after nuclear fusion heat recordwww.theguardian.com Energy based on power of stars is step closer after nuclear fusion heat record
Feat by scientists at Oxfordshire facility described as ‘fitting swansong’ for pioneering project as reactor is decommissioned
- Huge atom-smasher bid to find missing 95% of Universewww.bbc.co.uk Huge atom-smasher bid to find missing 95% of Universe
Researchers want a new, much bigger supercollider but is it worth us paying the £12bn price tag?
- Nuclear fusion reaction releases almost twice the energy put inwww.newscientist.com Nuclear fusion reaction releases almost twice the energy put in
The US National Ignition Facility has achieved even higher energy yields since breaking even for the first time in 2022, but a practical fusion reactor is still a long way off
- Feynman’s Reversed Sprinkler Puzzle Solved
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.
- 1939 Map of Physics by Frank Jacobs
cross-posted from: https://mander.xyz/post/9079658
> Sauce: https://mastodon.social/@gutenberg_org/111845638304911489
- CERN celebrates 70 years of particle physics researchwww.swissinfo.ch CERN celebrates 70 years of particle physics research
The European Organization for Nuclear Research (CERN) is organising numerous public events and activities this year to mark its 70th anniversary.
- Scientists trap krypton atoms to form one-dimensional gasphys.org Scientists trap krypton atoms to form one-dimensional gas
For the first time, scientists have successfully trapped atoms of krypton (Kr), a noble gas, inside a carbon nanotube to form a one-dimensional gas.
- A question about gravity
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?
