In my Dec 3 facebook post of me next to the Pluto-discovering telescope at Lowell Observatory, I hashtagged #PlutoCharonForBinaryPlanet. While facebook finds no other instances of that exact hashtag, the concept isn’t new.
Some time ago, I tried coming up with my own water-drop/ripple simulation for making a small animated-gif background (akin to the moving backgrounds, like clouds, ocean breakers, etc, that are so popular as church lyric-projector backgrounds right now). Basically, I had a sinusoidish curve, decaying with radius and time; I simulated a dozen or so of these drips, usually centered off-picture, and added the curves; it made for some nice randomish moving water-surface. (Sorry, I cannot find where I put it for now.)
So, as my daughter dropped her spoon at a meal yesterday, my son suggested we get her an anti-gravity spoon. I am a blessed man. 🙂
I started thinking about the fact that people rarely think through the implications of suddenly defeating gravity’s pull on a single object. Namely, that it’s gravity that’s providing the centripetal force to keep it moving with the planet.
So a radio host’s silly quiz game had the failing caller “fall into a bottomless chasm” or some such phrasing. That got me thinking: it’s bottomless, so there is nothing downwards from it; but if it’s truly bottomless, you’d go through the center of the earth, at which point you could hit a “ceiling” at a rather high speed, since you’d be going upwards at this point. But if there were no ceiling, that would be like ultimate bungee! Continue reading bottomless pit: ultimate bungee
I drive a Mazda RX-8, and ever since I heard about the RX-8 Hydrogen RE, I’ve wished it had made it into production in the United States. Every once in a while, I’ve googled to see if there’s anybody who converts RX-8’s to dual-fuel hydrogen, but I’ve not found any yet.
Ever since high school, when I first learned to derive the gravity of a sphere, I’ve wondered what gravity on a torus (donut) would be like. Continue reading gravity of a torus