Veritasium: The Big Misconception About Electricity. (YouTube, 14:47min) “The misconception is that electrons carry potential energy around a complete conducting loop, transferring their energy to the load.”
Category Archives: Physics
From cubic equations to the Schrödinger equation
Veritasium: This Problem Broke Math (and led to quantum physics). (YouTube, 23:28min) “A general solution to the cubic equation was long considered impossible, until we gave up the requirement that math reflect reality”. The video description contains uselful links to cubic equations and their solutions.
The Hubble Sphere, the Cosmic Event Horizon and the Observable Universe
Physics Girl: These Move Faster than the Speed of Light. (YouTube, 11:52min) “How is it possible for galaxies and objects in space to move away from us faster than the speed of light? Will we ever see those objects?”
The chances are about 1 in 100 billion per year
NPR: A meteorite crashes through a home in Canada, barely missing a woman’s head. “It turns out that the 2.8-pound space rock, about the size of a small cabbage, was part of a meteor shower identified by Alan Hildebrand, a planetary scientist in the Department of Geoscience at the University of Calgary, and his colleagues. The group said the trajectory of the meteorite that hit Hamilton’s house would have made it visible throughout southeastern British Columbia and central and southern Alberta.”
Victoria News: B.C. woman awakes to a hole in her roof and a space rock on her pillow.
Second link via MetaFilter.
More than you ever thought you wanted to know about submarines
Smarter Every Day: Nuclear Submarine Deep Dive is a series of nine videos that Destin Sandlin filmed while aboard a US Navy Nuclear Submarine in the Arctic (ICEX 2020) and released over the course of a year. The last one came out yesterday. They’re all worth watching!
Here are the episodes:
- How I Boarded a US Navy Nuclear Submarine in the Arctic (ICEX 2020) (Episode 237, 34:39min, June 14, 2020)
- Boarding a US Navy Nuclear Submarine in the Arctic – Smarter Every Day 240 (Episode 240, 29:24min, July 26 , 2020)
- Crawling Down A Torpedo Tube -US Navy Nuclear Submarine (Episode 241, 20:32min, August 16, 2020)
- How to Fight Fire or Flooding on a Nuclear Submarine (Episode 244, 27:00min, October 4, 2020)
- How to Make Pizza on a Submarine (Episode 246, 16:28min, November 1, 2020)
- How Sonar Works (Submarine Shadow Zone) (Episode 249, 26:41min, December 26, 2020)
- How Do Nuclear Submarines Make Oxygen? (Episode 251, 29:33min, February 21, 2021)
- How to Poop on a Nuclear Submarine (Episode 256, 23:24min, May 9, 2021)
- How to Surface a Submarine in the Arctic Ocean (Episode 260, 42:01min, July 30, 2021)