Rhett Allain
Physics professor and writer translating everyday physics, instrumentation, and problem‑solving; frequent course/playlist resources.
NASA Artemis Video Sparks In-Depth Physics Breakdown
When @nasa posts a cool #artemis video, I have to do a #physics analysis (extra homework included) https://rjallain.medium.com/the-physics-of-artemis-ii-video-analysis-of-the-orion-esm-separation-3307efb06139?sk=80caf4cceae9940c0f835d2cb3da1e04
Driving Faster Saves Time, Costs More Gas
Here’s a real world application of physics. How much time do you save by driving faster and how much more do you spend in gas?
Comprehensive Star Wars Physics Archive—Update Requests Welcome
Here is my giant list of #starwars #physics posts for #starwarsday. Some of these are old and decayed. If you see one you really want fixed, let me know. https://rhettallain.com/2017/03/19/science-fiction-physics/
University Refuses Retirement Bonus, Citing Cheaper Low Salary
HR at my university sometimes sends out retirement incentive plans. The one they sent me basically says "you make less than the average starting salary for an assistant professor, so we won't give you a package - it would...
Orbiting Needs Speed, Not Height: Artemis II Curve Explained
Why does the @nasa Artemis II curve so much on launch? Getting into orbit is more about going fast than going up. For low Earth orbit, it's over 80 percent kinetic energy. https://www.instagram.com/p/DXMmMxrAOtJ/?img_index=1
People Question Need for AI-Generated Artemis Images
I don't understand why there are AI photos from Artemis. I mean, the real pictures are super awesome - there's just no reason for fake. Is there?
Jules Verne's Moon‑Earth Neutral Point: Surprisingly Accurate?
In the book From the Earth to the Moon, Jules Verne calculates the "neutral point" of gravity based on the density of Earth and Moon. His location was 47/60th the way there. Was he right? https://www.instagram.com/p/DWpIDBgAJuq/
University Forces Safety Quiz, Denies Ergonomic Upgrades
University required quarterly safety training: be careful when using a computer. If you don't have a proper desk, you will hurt yourself. Click this quiz to acknowledge. me: Oh, I need a better desk and chair to improve ergonomics. University:...
ISS Sections Experience Varying Accelerations Despite Uniform Weightlessness
My first answer is no. It’s different weightless at Lagrange point and orbit - but you would never feel the difference. In orbit, different parts of ISS have different orbits technically and thus different acceleration. Same is tru near L1,...
Understanding EM Wave Reflection, Refraction, and Brewster’s Angle
New #electrodynamics #physics video - looking at reflection and transmission of electromagnetic waves. Snell's law and Brewster's angle. https://youtu.be/_dFKj6OE05I