### ScotBlogs Network

#### Academic

Global SE

Libraries@Wooster

Wooster Geologists

Wooster Physicists

The Wooster Forum#### Administrative

Emergency Campus Updates

On Purpose: Strategic Planning @ Wooster

Sustainability @ Wooster#### Office

Center for Diversity & Global Engagement

Under The Kilt

Web Communication @ Wooster#### Program

2014 Hales Expedition to Japan

Discovery of India

Hales Expedition 2018 – Australia

Hales Fund – China Trip

Hales Fund – Iceland

Hales Group 2017 – London

Incidents of Travel in Yucatan

Jenny Investment Club

Jordan and Jerusalem: A Hales Group Expedition

Music Camp

OISA Intercultural Partner Program#### Student

Alex@Wooster

Bastiaan@Wooster

Cabbage and Caviar

Cheers!

For the Love of Plaid

In The Garden

Morgan@Wooster

Tales of the Russian North

# Author Archives: John F. Lindner

## Norton’s Dome

The Shape In dimensionless coordinates, with the [latex]z[/latex]-axis pointing down, Norton’s dome has the shape [latex display=”true”] z = \frac{2}{3}s^{3/2},[/latex] where [latex]s[/latex] is the arc length along the dome. If [latex]ds^2 = dx^2 + dz^2[/latex], then [latex display=”true”] x = \int dx … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Norton’s Dome

## Dancing on Mars

I ran up the stairs to the Studio Art Crit space. Justine was already rolling out the treadmill, so I climbed to the old running track and let down both ends of the steel cable, one end connected to the … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Dancing on Mars

## On Mercury One Day Lasts Two Years

Mercury has the most noncircular or eccentric orbit of any non-dwarf planet in the solar system. This eccentricity may have trapped Mercury in a 3:2 spin-orbit resonance, where it rotates three times for every two revolutions. When nearest Sol at … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on On Mercury One Day Lasts Two Years

## Dynamo

Stationary electric charges generate radial electric fields, and electric fields push positive charges (and pull negative charges). Moving charges also generate circulating magnetic fields, and magnetic fields deflect moving charges perpendicular to both the fields and their motions. All of electromagnetism follows. In … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Dynamo

## Falcon Heavy

I was supervising Jr IS, but as I circulated around the lab, I watched the clock. Everyone was working quietly. Just before launch, I snuck back to my office and closed the door. The SpaceX Falcon Heavy was surrounded by … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Falcon Heavy

## The Impossible Problem

In 1969, Hans Freudenthal posed a puzzle that Martin Gardner would later call “The Impossible Problem”. Below is a 2000 version due to Erich Friedman. I have secretly chosen two nonzero digits and have separately told their sum to Sam … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on The Impossible Problem

## Electronic Kilogram

The kilogram is the only metric unit still defined by an artifact. The International Prototype Kilogram, IPK or “Le Grand K”, is a golf-ball-sized platinum-iridium cylinder in a vault outside Paris. This year I expect the General Conference on Weights … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Electronic Kilogram

## Taylor Bowl

On Wednesday, September 13, 1989, I met with newly elected Physics Club officers Tom Taczak ’91, Dennis Kuhl ’90, Doug Halverson ’91, and Karen McEwen ’90 in Westminister House. I wrote in my diary, “first phys club meeting w. officers goes well”. That year … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Taylor Bowl

## Newton’s Can(n)on

One of my favorite illustrations is the cannon thought experiment from volume three of Isaac Newton‘s Principia Mathematica. Johannes Kepler argued that planets orbit elliptically with Sol at one focus. Galileo Galilei argued that terrestrial bodies fall parabolically in space … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on Newton’s Can(n)on

## ein Stein

I’ve been fascinated by aperiodic tilings of the plane since Martin Gardner first wrote about them in Scientific American. In the 1960s, Robert Berger discovered a set of 20 426 prototiles or tile-types that can tile the plane but only with no … Continue reading →

Continue reading

Posted in ScotBlogs Contributed
Comments Off on ein Stein