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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 …
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 …
Paul Dirac: the purest soul in physics – Physics World
Feb 1, 1998 · Paul Dirac was born at 15 Monk Road in Bishopston, Bristol, on 8 August 1902, and educated at the nearby Bishop Road Primary School. The family later moved to Cotham Road, near the University of Bristol, and in 1914 the young Dirac joined Cotham Grammar School, formerly the Merchant Venturers. Dirac was a student at Bristol University between ...
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.
The double-slit experiment - Physics World
Sep 1, 2002 · This article is an extended version of the article “The double-slit experiment” that appeared in the September 2002 issue of Physics World (p15). It has been further extended to include three letters about the history of the double-slit experiment with single electrons that were published in the May 2003 issue of the magazine.
Cecilia Payne-Gaposchkin: the woman who found hydrogen in the …
Taken from the March 2022 issue of Physics World, where it appeared under the headline "The woman who found hydrogen in the stars". Sidney Perkowitz delves into the work and life of Cecilia Payne-Gaposchkin, from her stellar astronomical findings to a career-long struggle with bias against women in the early 20th century.
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 ...
Knowledge grows step-by-step despite the exponential growth of …
Sep 27, 2024 · Defining knowledge is complex, but it can be thought of as a network of interconnected beliefs and information. To measure it, the authors previously created a knowledge quantification index (KQI). This tool uses various scientific impact metrics to examine the network structures created by publications and their citations and quantifies how well publications …
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 …