Computing

Category archives for Computing

The Sound of Simulated Bombs

So, last week I idly wondered about the canonical falling-bomb whistle. The was originally intended to be a very short post just asking the question, but I got caught up in thinking about it, and it ended up being more substantial. And leaving room for further investigation in the form of, you guessed it, VPython…

Computers and Shades

In comments to the post on computer display colors, Will Slaton notes that Mac displays emit polarized light. And, indeed, this is an inherent part of the backlit LCD technology– the individual pixels are bits of liquid crystal between two polarizers, and an applied voltage causes the liquid crystal molecules to flip between a state…

On Computer Color

This year’s “Flame Challenge” is to explain color in terms an 11-year-old can follow. I have opinions on this subject, a background in AMO physics, and access to scientific equipment, so I’m putting something together. In the course of this, though, it occurred to me to wonder how my different portable computing devices process color.…

Follow the Bouncing Ball

Last week, Rhett did a post on animating a bouncing ball in VPython. This was mostly making a point about the distinction between real simulation and animation, along the lines of yesterday’s post on social construction of videogame reality. But, of course, my immediate reaction was, “That’s not how a bouncing ball looks…” This is…

Video Editing Software?

Both SteelyKid’s kindergarten and the snow-day day-care program that the kids go to were closed today, which kind of threw a wrench in things. But it’s also kind of fun, as I got to spend some time playing outside with SteelyKid on her play set in the snow. The “featured image” above is a cell-phone…

Sticky Tape: The Final Chapter

I realize people are getting sick of reading me talk about this charged-tape business, which has run to one, two, three, four posts at this point. Truth be told, I’m losing enthusiasm for it myself. So this will be the final post, at least for now… As I mentioned on Twitter, as I type this…

In the previous post about simulating the attraction between sticky tapes using VPython, I ended with a teaser mentioning that there was a discrepancy between the simulation and the theoretical solution from directly solving the equations. The problem is kind of subtle, but clearly visible in this graph from that post: In this, we see…

Simulated Tape and Universal Behavior

Having spent a lot of time solving equations related to sticky tape models, including trying to work solutions in my head while driving to Grandma and Grandpa’s with the kids, and making some measurements of real tapes, there was only one thing left to do: try simulating this problem in VPython. Because I’m a physics…

We cleared a bunch of space in our deep storage area over the summer, and one of the things we found was a box full of old student theses from the 1950’s and 1960’s. The library already had copies of them, but I thought it was sort of cool to have a look into the…

Fun With Simulated Scattering

Two chapters of the book-in-progress will be devoted to the development of the modern understanding of the atom. One of these is about the Bohr model, which turned 100 this year, but Bohr’s model would not have been possible without an earlier experiment. The actual experiment was done by Ernest Marsden and Hans Geiger, but…