Physics Challenge Dec14

Physics Challenge for Teachers and StudentsBoris Korsunsky

Citation: The Physics Teacher 52, 572 (2014); doi: 10.1119/1.4902213 View online: http://dx.doi.org/10.1119/1.4902213 View Table of Contents: http://scitation.aip.org/content/aapt/journal/tpt/52/9?ver=pdfcov Published by the American Association of Physics Teachers

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After I gave students their prior knowledge Preservice teachers conceptions of student prior knowledge AIP Conf. Proc. 720, 141 (2004); 10.1063/1.1807274

This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:222.164.139.131 On: Sat, 29 Nov 2014 19:30:44

Daniel Mixson (Naval Academy Preparatory School, Newport, RI)

Carl E. Mungan (U. S. Naval Academy, Annapolis, MD)

Pascal Renault (John Tyler Community College, Midlothian, VA)

Joseph Rizcallah (Sagesse High School, Ain Saadeh, Lebanon)

Ryan Yancey (Lancaster High School, Lancaster, CA)

Guidelines for contributors: We ask that all solutions, preferably in Word format, be

submitted to the dedicated email address [email protected]. Each message will receive an automatic acknowledgment.

The subject line of each message should be the same as the name of the solution file (see the instructions below).

The deadline for submitting the solutions is the last day of the corresponding month.

Each month, a representative selection of the success-ful solvers names will be published in print and on the web.

If your name isfor instanceStephen Colbert, please name the file Dec14Colbert (do not include your first initial) when submitting the December solution.

If you have a message for the Column Editor, you may contact him at [email protected]; however, please do not send your solutions to this address.

As always, we look forward to your contributions and hope that they will include not only solutions but also your own Challenges that you wish to submit for the column. Many thanks to all contributors and we hope to hear from many more of you in the future! Boris Korsunsky, Column Editor

w Defying gravity in a cavityA small disc of mass m is held at rest at the edge of a hemi-spherical cavity made in a solid block of mass 3m. The block is placed on a horizontal surface. The disc is released and slides downward along the surface of the cavity. Find the normal force acting on the block from the floor at the moment the disc is at the bottom of the cavity. Neglect fric-tion between all surfaces.

We received many solutions to our September Challenge, The Second Half of the Flight. Unfortunately, very few of them came from students. We hope that our readers will keep encouraging their students to participate.

We are pleased to recognize the following contributors: Salvatore Basile (Universit degli Studi di Palermo,

Palermo, Italy)Philip Blanco (Grossmont College, El Cajon, CA)Don Easton (Lacombe, Alberta, Canada)Gerald E. Hite (TAMUG, Galveston, TX)Art Hovey (Galvanized Jazz Band, Milford, CT)David Jones (Florida International University, Miami, FL)Jos Ignacio iguez de la Torre (Universidad de

Salamanca, Salamanca, Spain)Jarrett L. Lancaster (University of North Carolina at

Greensboro, Greensboro, NC)John Mallinckrodt (Cal Poly Pomona, Pomona, CA)Matthew W. Milligan (Farragut High School, Knoxville,

TN)

Physics Challenge for Teachers and Students

Boris Korsunsky, Column EditorWeston High School, Weston, MA 02493 [email protected]

m

3m

572 The Physics Teacher Vol. 52, December 2014 DOI: 10.1119/1.4901626 This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:

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Physics Challenge Dec14

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