Twists, turns, thrills and spills: the physics of rollercoasters
Aug 14, 2021 · A unit that might make purists wince, the G-force is the difference between the acceleration, a, that you experience as a rider and the acceleration due to gravity, g, (9.8 m/s 2) divided by g and expressed per unit mass: (a–g)/g.This force comes into play thanks to the movement you undergo on the ride– you experience a “positive” G-force when the train is at the bottom of a hill, and ...
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The Turing Test 2.0 – Physics World
Taken from the May 2021 issue of Physics World. When Alan Turing devised his famous test to see if machines could think, computers were slow, primitive objects that filled entire rooms. Juanita Bawagan discovers how modern algorithms have transformed our understanding of the “Turing Test” and what it means for artificial intelligence.
The physics of blood spatter – Physics World
17 Oct 2019. Taken from the October 2019 issue of Physics World. Analysing the blood stains following a shooting can be key to finding the perpetrator, but it’s a field of forensics that is being called into question. Sidney Perkowitz explains how understanding the physics behind the blood distribution could help uncover the truth.
Graphene at 20: why the ‘wonder material’ is finally coming good ...
Apr 30, 2024 · The report estimates that the graphene market was worth about $100m in 2022 and is rising at a compound annual growth rate of 20–30%. The biggest potential applications, the authors reckon, lie in graphene electronics, where the market could be worth up to $1bn in the next few years. Growth rates of up to 40% are predicted – and potentially ...
The spin of a proton - Physics World
Jun 4, 2015 · At stake is the intrinsic angular momentum, or “spin”, of a proton. Spin is a quantum-mechanical property, akin to the angular momentum of a classical sphere rotating on its axis, except it comes in discrete units of integer or half-integer multiples of ħ. The proton, like the electron and neutron, has a spin of ħ /2, or “spin-1/2”.
Lithium-ion batteries break energy density record - Physics World
Apr 21, 2023 · Lithium-ion batteries recharge in the cold. The researchers, who report their work in Chinese Physics Letters, explain that a trade-off always exists between the energy density, cycle performance, rate capability and safety of lithium-ion batteries.Safety is a primary requirement, but elevated energy density will increase the risks during battery operation, they say.
Stephen Hawking’s scientific legacy – Physics World
May 1, 2018 · Congratulations to Seth Lloyd, whose article “Stephen Hawking’s scientific legacy“ has been picked as one of Physics World‘s five favourite features of 2018.The article is taken from the May 2018 issue of Physics World.. The late Stephen Hawking is an icon of modern physics. As well as inspiring generations of scientists, his contributions have …
Brilliant polymath, troubled person: how John von Neumann …
Dec 18, 2021 · Visionary thinker John von Neumann (right) received the Medal of Freedom from President Dwight Eisenhower in 1956. (Courtesy: Byron Rollins/ AP/ Shutterstock) Few mathematicians during the last century – perhaps only Bertrand Russell and Alan Turing – were as successfully polymathic as John von Neumann, the subject of the biography The Man from the Future: the Visionary Life of John von ...
Paul Dirac: the purest soul in physics – Physics World
Feb 1, 1998 · Paul Dirac: the purest soul in physics. 01 Feb 1998. Paul Dirac published the first of his papers on “The Quantum Theory of the Electron” seventy years ago this month. The Dirac equation, derived in those papers, is one of the most important equations in physics, says Michael Berry. Genius at work.