Twists, turns, thrills and spills: the physics of rollercoasters
网页2021年8月14日 · 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 ...
Home – Physics World
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Brilliant polymath, troubled person: how John von Neumann …
网页2021年12月18日 · 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 ...
The physics of blood spatter – Physics World
网页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.
Research update Archives – Physics World
网页Metasurface makes thermal sources emit laser-like light. Pillar-studded surface just hundreds of nanometres thick allows researchers to control direction, polarization and phase of thermal radiation. Radiotherapy. Research update.
The enduring mystery of the solar corona – Physics World
网页2021年9月16日 · It’s the solar corona – a hot plasma that extends millions of kilometres out into space. This region is a million times dimmer than the solar surface beneath, yet, strangely, it’s at least 1 million kelvin hotter. Seven decades after the unexpected observation was first made, it’s still one of the biggest mysteries in astronomy.
The double-slit experiment – Physics World
网页2002年9月1日 · 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.
F = ma – Physics World
网页2006年3月1日 · The equation F = ma, shorthand for Newton’s second law of motion, is the 1 + 1 = 2 of classical mechanics. The equation seems obvious and straightforward. It appears simply to translate an ordinary experience into measurable terms: push something and it moves. Yet like 1 + 1 = 2, F = ma grows mysterious when looked at closely.
How flowing galaxies revealed the immensity of the Laniakea ...
网页2015年8月13日 · How flowing galaxies revealed the immensity of the Laniakea Supercluster. In this 2D slice of the supergalactic equatorial plane, the boundary of Laniakea is the closed orange curve. The white lines are velocity-flow curves where red denotes areas of high density and blue shows low density. The Milky Way is the black dot on the right-hand side ...
What is time? – Physics World
网页What is time? 24 Oct 2013. Taken from the 25th anniversary issue of Physics World, this article examines one of the five biggest unanswered questions in physics as selected by the magazine’s editors. Scientists and philosophers have been debating the nature of time for centuries, and despite some progress, Adam Frank believes that this is one ...
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