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网页Are you an IOP member? Create a Physics World account to get access to all available digital issues of the monthly magazine. Your Physics World account is separate to any IOP accounts you may have.. Note: The verification e-mail to complete your account registration should arrive immediately. However, in some cases it takes longer. Don't forget to check …
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 …
Cecilia Payne-Gaposchkin: the woman who found hydrogen in the …
网页08 Mar 2022. 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.
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 …
New definition of the kilogram comes into force - Physics World
网页2019年5月17日 · SI gets a makeover. The ampere, meanwhile, will now be set by the elementary electrical charge, e, which is given as 1.602,176,634 × 10-19 when expressed in coulombs. The kelvin is defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380,649 × 10-23 when expressed in the unit J K-1.Finally, the mole is …
Do atoms going through a double slit ‘know’ if they are being …
网页2015年5月26日 · In the famous double-slit experiment, single particles, such as photons, pass one at a time through a screen containing two slits. If either path is monitored, a photon seemingly passes through one slit or the other, and no interference will be seen. Conversely, if neither is checked, a photon will appear to have passed through both slits ...
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网页Are you an IOP member? Create a Physics World account to get access to all available digital issues of the monthly magazine. Your Physics World account is separate to any IOP accounts you may have.. Note: The verification e-mail to complete your account registration should arrive immediately. However, in some cases it takes longer. Don't forget to check …
Paul Dirac: the purest soul in physics – Physics World
网页1998年2月1日 · 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 …
Sunflowers ‘dance’ together to share sunlight – Physics World
网页2024年8月27日 · Sunflowers ‘dance’ together to share sunlight. Dancing in the sunlight: Yasmine Meroz inspects a sunflower plant. (Courtesy: Tel Aviv University) Sunflowers in a field can co-ordinate the circular motions of their growing stems to minimize the amount of shade each plant experiences – a study done in the US and Israel has revealed.
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.