Author
David Kagan
Bio: David Kagan is an academic researcher from California State University, Chico. The author has contributed to research in topics: Baseball bat & Conservation law. The author has an hindex of 8, co-authored 30 publications receiving 138 citations.
Papers
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TL;DR: In this paper, the authors report on their measurements of the coefficient of restitution of baseballs as a function of the humidity at which they have been stored and report that long flies hit with balls stored under conditions of extreme humidity could be expected to fall as much as 30 feet short of the distance expected for normal balls.
Abstract: The only published scientific data on the effect of humidity on baseballs known to the authors is contained in Robert Adair's book The Physics of Baseball: “long flies hit with balls stored under conditions of extreme humidity could be expected to fall as much as 30 feet short of the distance expected for normal balls.”1 In this paper we report on our measurements of the coefficient of restitution of baseballs as a function of the humidity at which they have been stored.
18 citations
TL;DR: The classic experiment to measure the drag coefficient involves dropping coffee filters as discussed by the authors, but it is more fun to try something different, and it is conducted nearly 4000 times a day during the baseball season and free access to this PITCHf/x data.
Abstract: The classic experiment to measure the drag coefficient involves dropping coffee filters.1 Wouldn't it be more fun to try something different? In fact, an experiment on the drag force is conducted nearly 4000 times a day during the baseball season and you have free access to this PITCHf/x data!2
16 citations
14 citations
TL;DR: In this paper, a simple method for measuring both the change in potential energy and kinetic energy in the Gauss accelerator has been presented, which can be made with rulers, strings, and weights.
Abstract: James Rabchuk's recent paper1 describes a method for measuring the kinetic energy changes in the Gauss accelerator, as well as a calculation of the change in potential energy. In this paper, a simple method for measuring both the change in potential energy and the change in kinetic energy will be presented. The measurements can be made with rulers, strings, and weights. In the process, your students will learn about the relationship between work and potential energy as well as the law of conservation of energy. Issues associated with the law of conservation of momentum in the accelerator will also be addressed.
13 citations
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31 Oct 2001
TL;DR: The American Society for Testing and Materials (ASTM) as mentioned in this paper is an independent organization devoted to the development of standards for testing and materials, and is a member of IEEE 802.11.
Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.
3,792 citations
TL;DR: In this article, an analysis and numerical integration of the equations of motion for an experimental stemless top that includes gyroscopic precession around the local magnetic field lines predict that the top will be supported stably up to spin speeds of about 3065 rpm.
Abstract: The stability of the Levitron® cannot be explained if the top’s axis has a fixed direction in space. Stability against flipping is not enough. Gyroscopic precession around the local magnetic field direction is necessary. An analysis and numerical integration of the equations of motion for an experimental stemless top that includes gyroscopic precession around the local magnetic field lines predict that the top will be supported stably up to spin speeds of about 3065 rpm. An upper spin limit of 2779 rpm for this top is observed experimentally and explained as an adiabatic condition. Spin stabilized magnetic levitation is a macroscopic analog of magnetic gradient traps used to confine particles with a quantum magnetic moment.
109 citations
TL;DR: In this paper, an improved model for the pitch, batting, and post-impact flight phases of a baseball is used in an optimal control context to find bat swing parameters that produce maximum range.
Abstract: ~Received 12 June 2002; accepted 3 July 2003! Improved models for the pitch, batting, and post-impact flight phases of a baseball are used in an optimal control context to find bat swing parameters that produce maximum range. The improved batted flight model incorporates experimental lift and drag profiles ~including the drag crisis! .A n improved model for bat‐ball impact includes the dependence of the coefficient of restitution on the approach relative velocity and the dependence of the incoming pitched ball angle on speed. The undercut distance and bat swing angle are chosen to maximize the range of the batted ball. The sensitivity of the maximum range is calculated for all model parameters including bat and ball speed, bat and ball spin, and wind speed. Post-impact conditions are found to be independent of the ball‐bat coefficient of friction. The lift is enhanced by backspin produced by undercutting the ball during batting. An optimally hit curve ball will travel farther than an optimally hit fastball or knuckleball due to increased lift during flight. © 2003 American Association of Physics Teachers.
101 citations
Book•
01 Jan 2004
TL;DR: In this paper, the physics of baseball e-books are available for download for free and can be found in various data types and media, such as word, ppt, txt, pdf, word, rar, zip, as well as kindle.
Abstract: Are you looking to uncover the physics of baseball Digitalbook. Correct here it is possible to locate as well as download the physics of baseball Book. We've got ebooks for every single topic the physics of baseball accessible for download cost-free. Search the site also as find Jean Campbell eBook in layout. We also have a fantastic collection of information connected to this Digitalbook for you. As well because the best part is you could assessment as well as download for the physics of baseball eBook Need a fantastic e-book? the physics of baseball by , the very best one! Wan na get it? Discover this excellent e-book by right here currently. Download or check out online is available. Why we are the best website for downloading this the physics of baseball Naturally, you can select guide in various data types and media. Try to find ppt, txt, pdf, word, rar, zip, as well as kindle? Why not? Get them here, now! Have leisure times? Read the physics of baseball writer by Why? A best seller publication on the planet with fantastic value and also content is combined with intriguing words. Where? Just here, in this website you could read online. Want download? Of course offered, download them additionally below. Readily available data are as word, ppt, txt, kindle, pdf, rar, and zip. GO TO THE TECHNICAL WRITING FOR AN EXPANDED TYPE OF THIS THE PHYSICS OF BASEBALL, ALONG WITH A CORRECTLY FORMATTED VERSION OF THE INSTANCE MANUAL PAGE ABOVE.
94 citations
TL;DR: An introductory physics course that meets the needs of biology students must recognize that the two disciplines see the world differently.
Abstract: An introductory physics course that meets the needs of biology students must recognize that the two disciplines see the world differently.
58 citations