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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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 ...
James Clerk Maxwell: a force for physics – Physics World
Dec 1, 2006 · Born 175 years ago, James Clerk Maxwell carried out the first profound unification of nature’s forces. Francis Everitt examines the immense contributions of the greatest mathematical physicist since Newton. Deserving recognition. Unless one is a poet, a war hero or a rock star, it is a mistake to die young. James Clerk Maxwell – unlike ...
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.
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 …
Max Planck: the reluctant revolutionary – Physics World
Dec 1, 2000 · Planck initially believed that he had justified the irreversibility of radiation processes through the lack of time symmetry in Maxwell’s equations – i.e. that the laws of electrodynamics distinguish between past and present, between forward-going and backward-going time. However, in 1897 Boltzmann demolished this argument.
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.
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.
‘Great observatories’ – the next generation of NASA’s space …
Nov 22, 2022 · Working alongside each other to study the universe, these telescopes have spearheaded NASA’s astrophysics research for decades. The reuse of this phrase “great observatories” in the new decadal survey is deliberate, says the survey’s co-chair, Fiona Harrison of the California Institute of Technology.. “It’s to get across the point that panchromatic observations, from X-rays to ...