Derek McKenzie @PhysicsFootnote
Physics Footnotes is a project dedicated to helping STEM teachers bring physics to life, one footnote at a time https://t.co/LOugb2VCO5 Joined June 2016-
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90% of emails I get begin with "I am not a physicists, but..."
If you are familiar with terms like "isomorphism", "homeomorphism", "diffeomorphism", etc. you'll be able to relate to this Poincare quip from an article he wrote entitled "The Future of Mathematics".
This photo was taken by someone currently driving in the Atlas mountains, Morocco. The crisps were bought at 1050m altitude, while the picture was taken at 2200m. Crisp Roulette. When will they pop? [Photo submitted by a member of facebook.com/groups/Physics…]
Relationship between force F, torque τ, linear momentum p, and angular momentum L in a system which has rotation constrained to only one plane (forces and moments due to gravity and friction not considered). [Src: Wikipedia/Torque]
The derivative of volume (4/3)(pi)r^3 of a sphere with respect to r is its surface area 4(pi)r^2. The derivative of area (pi)r^2 of a circle wrt r is its circumference 2(pi)r. It's not a coincidence so why is this? You can find out about it and more at sunglee.us/mathphysarchiv…
A pile driver is a device which converts the gravitational potential energy of a raised weight to kinetic energy, to do the work necessary to drive poles into soil. Usually the weight is raised using hydraulics, steam, or diesel, but not always... youtu.be/eixxHgYXnP8
The International Astronomical Union has voted to recommend changing the name of the law describing cosmic expansion from Hubble’s law to the Hubble-Lemaître law, honoring the contributions of Belgian astronomer Georges Lemaître: astronomynow.com/2018/10/29/iau…
Stigler's Law of Eponymy is named after University of Chicago statistics professor Stephen Stigler, based on his 1980 publication "Stigler’s law of eponymy", although Stigler himself credits sociologist Robert K. Merton as its true discoverer.
Physics Footnoters is a free new group of over 1,000 science teachers and communicators with a particular enthusiasm for bringing textbook physics to life in the classroom. Request to Join Here: facebook.com/groups/Physics…
Today's paper answers a simple question: Why some things are darker when wet? You just need some basic knowledge about elementary optics to understand it. Paper here: fermatslibrary.com/s/why-some-thi…
As a jet lands on an aircraft carrier a tailhook snags one of several cables spanning the landing strip. The cables are attached to hydro pneumatic cylinders, which absorb the jet's kinetic energy. An arresting system can bring a 25t jet from 240km/h to rest over 100m in just 2s!
Sir Anthony Leggett (born 26 March 1938), has been a professor of physics at the University of Illinois since 1983. He is widely recognized as a world leader in the theory of low-temperature physics, and his pioneering work on superfluids won him the 2003 Nobel Prize in Physics.
The International Space Station follows an (almost) circular path around the Earth. When you unfold that 3-dimensional circular path into a 2-dimensional Mercator map it appears like a sinusoidal wave. Here is an interesting visualization of this phenomenon.
Physicist Dan Russell fills a tank with sugar water solution to create an index of refraction that varies with depth. Because of the large density gradient near the bottom, light bends instead of traveling in a straight line youtu.be/1hEtysJN0gs

Rhett Allain @rjallain
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iilyak @iilya_k
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Fermat's Library @fermatslibrary
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