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June 2017 Issue, Volume 85 No. 6

AAPT announces that Richard Price, Massachusetts Institute of Technology, will assume the position of Editor for the  American Journal of Physics in September 2017, following the term of David P. Jackson.
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June 2017 Issue, Volume 85, No. 6

A quantitative analysis of the chain fountain by J. Pantaleone.  DOI: 10.1119/1.4980071

When a chain flows up over the edge of a container and then falls to the ground below, it is observed that the top of the chain rises up above the container's edge. This is called a “chain fountain,” and is an entertaining and counterintuitive phenomenon. In this paper, the steady-state motion of the fountain is analyzed experimentally and theoretically. Measurements are given for the speeds and heights for three different chains and three different distances from the container to the floor. It is shown that the distance the chain rises above the container is proportional to the force from the container on the chain. A simple model is developed for how the chain interacts with the container, and shows that a link lifts-off from the container after rotating by a relatively small angle. The model's predictions agree very well with the measurements for the two ball-chains.

Letters to the Editor

An Apology from the Former Associate Editor by Daniel V. Schroeder.  DOI: 10.1119/1.4981790


2017 AAPT Award Citations at the Winter Meeting, New Orleans, LA by Mary Mogge. DOI: 10.1119/1.4979867

2017 Oersted Medal Presentation: The changing face of physics and the students who take physics by Jan Tobochnik. DOI: 10.1119/1.4980008


A quantitative analysis of the chain fountain by J. Pantaleone.  DOI: 10.1119/1.4980071

Motion of a falling object retarded by magnetic impulses by Yasuyuki Nogi, Masayuki Watanabe, Kiyomitsu Suzuki, and Yasunori Ohkuma. DOI: 10.1119/1.4979655

Measuring the spatial resolution of an optical system in an undergraduate optics laboratory by Calvin Leung, and T. D. Donnelly. DOI: 10.1119/1.4979539

One-way invisibility in isotropic dielectric optical media by S. A. R. Horsley, and S. Longhi. DOI: 10.1119/1.4979342

Rotating and rolling rigid bodies and the “hairy ball” theorem by Edward Bormashenko, and Alexander Kazachkov. DOI: 10.1119/1.4979343

On the origin of energy: Metaphors and manifestations as resources for conceptualizing and measuring the invisible, imponderable by Benedikt W. Harrer. DOI: 10.1119/1.4979538


Epistemic beliefs of non-STEM majors regarding the nature of science: Where they are and what we can do by Shannon D. Willoughby, and Keith Johnson. DOI: 10.1119/1.4979654


A smooth trip to Alpha Centauri: Comment on “The least uncomfortable journey from A to B” [Am. J. Phys. 84(9) 690–695] by Riccardo Antonelli, and Alexander R. Klotz. DOI: 10.1119/1.4981789


Wiedemann-Franz law demonstration in a student practicum by V. N. Glazkov, L. Ginzburg, and A. Orlov. DOI: 10.1119/1.4982787


Deconstructing Cosmology by Harry Nussbaumer. DOI: 10.1119/1.4975074


American Journal of Physics 85, 479 (2017); DOI: 10.1119/1.4982781

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