This Harvard physics apparatus uses a series of pendulums of varying lengths, swinging together, to make a mesmerizing dance:
The period of one complete cycle of the dance is 60 seconds. The length of the longest pendulum has been adjusted so that it executes 51 oscillations in this 60 second period. The length of each successive shorter pendulum is carefully adjusted so that it executes one additional oscillation in this period. Thus, the 15th pendulum (shortest) undergoes 65 oscillations.
Our apparatus was built from a design published by Richard Berg [Am J Phys 59(2), 186-187 (1991)] at the University of Maryland. The particular apparatus shown here was built by our own Nils Sorensen.
The bad news is that, due to the sheer tininess of certain components, iPhones are particularly vulnerable to going haywire in the presence of helium. The good news is that helium just isn’t a problem you run into often. Sure enough, Apple’s user guide for the iPhone and Apple watch admits this is a problem: […]
A single smut-addicted official at the US Geological Survey led to an IT crisis there, according to an official report, with visits to more than 9000 porny URLs resulting in a malware infestation. The recommendations? Filter the web, and plug those damned USB ports. Correction: More than 9000 sites, not 9000 infections.
The key to learning any new language is feedback. When you’re immersed in conversation, it’s easy to pick up key phrases and pronunciation, but not all of us have the means to jet off to Spain, France or wherever we can learn to speak like a local. The next best thing: The Mondly app. Mondly […]
Got a gadget-minded geek on your holiday list this year? Don’t wait for Black Friday. The prices are already dropping on some quality tech toys, and we’ve got a roundup of some of our favorites. Force Flyers DIY Building Block Drone MSRP: $49.99 | Normally: $42.99 | Price Drop: $39.99 (20% Off) Compatible with everybody’s […]
Ever wondered what it takes to make the transition from amateur photography to a full career? If you answered “a better camera,” you’re half right. Before you get the equipment, get the know-how to use it with the Hollywood Art Institute Photography Course & Certification. Taught by experienced pros, this course is geared towards shutterbugs […]