Cover Collection •  Archives 2006 | 2005 | 2003 & 2002
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This month’s cover is Craig Bohren’s paper, beginning on p. 522 of this issue, discusses the factors that affect the freezing of streams and ponds.


This month’s cover is a portrait of Robert Jemison “Tee” Van de Graaff, along with images of his legacy. This fall marks the 75th anniversary of his invention, which paved the way for advances in nuclear and particle physics, and is used in medicine to treat cancer and in industry for materials analysis. However, it is physics teachers who use it most, and we are directly responsible for making Van de Graaff’s name so famous. His brother’s daughter, Pat Hanson, commissioned the portrait, painted by Viktor Korotayev, and this is the first time the foundation overseeing his original home has permitted this picture, as well as Fig. 1 in the paper (beginning on p. 463), to be published. Permission granted only to The Physics Teacher. ©2004 Jemison-Van de Graaff Mansion Foundation Inc.


This month’s cover shows the photo, by Carrie Dawson of Warren Hills High School, in Washington, NJ, won first place in the Natural Category of the 2004 AAPT High School Physics Photo Contest. As the girl rides down the slide, her clothes rub against the thick plastic, causing her to become charged. Since her hairs all have net charge of the same sign, they repel each other and stand on end, as shown.


This month’s cover shows the coefficient of restitution for a collision between a baseball and a bat depends on the conditions under which the ball was stored prior to play. The paper by David Kagan and David Atkinson, beginning on p. 330, describes experiments to determine how this coefficient depends on the relative humidity.


This month’s cover shows a pair of tulips and their image in a ‘double mirror.’ The unusual orientation of the image is discussed in DeWeerd and Hill’s paper on the handedness of images beginning on p. 275 in this issue.


This month’s cover is an artist’s concept of a planet, at least four times the mass of Jupiter, in orbit only 8 million miles from the star Tau Bootis. As discussed in this month’s paper by LoPresto and McKay (pp. 208-211), discovery of so-called "exoplanets" has been accomplished, not by imaging these planets, but by detecting the gravitational influence on their parent stars. © David A. Hardy/


This month’s cover shows color patterns obtained inside a simple color mixing apparatus. Gorazd Planinsic describes how to construct the device out of LEDs and a Ping-Pong ball in his paper beginning on p. 138 of this month’s issue.


This month’s cover is a physics student in East Timor creates a sine wave by swinging a bottle filled with water that is escaping through a small hole in the base. Curt Gabrielson’s paper beginning on p. 98, "Physics in East Timor," describes a number of interesting activities that can be performed using simple materials.


This month’s cover shows Frank DeLarzelere, of BikerFox in Tulsa, Okla. William Wehrbein’s paper on " wheelies" and "headers," beginning on p. 27, discusses how to keep both wheels on the ground. (Photo by Jim Danforth & Chandra Hall)

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