美国物理教师协会
期刊
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图书
作者:Edward Bormashenko
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.447-453AAPT
摘要:Rotating and rolling rigid bodies exemplify a fascinating theorem of topology, jokingly called the “hairy ball” theorem, which demands that any continuous tangent vector field on the sphere has at least one point where the field is zero. We demonstrate via a gedanken experim...
作者:Harry Nussbaumer
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.478-479AAPT
作者:Shannon D. Willoughby , Keith Johnson
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.461-468AAPT
摘要:Students enrolled in introductory astronomy at a mid-sized land grant institution were surveyed at the start and end of each semester for three years regarding their epistemic beliefs about the physical sciences. After collecting data for two years in the control (baseline) cours...
作者:Calvin Leung , T. D. Donnelly
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.429-438AAPT
摘要:Two methods of quantifying the spatial resolution of a camera are described, performed, and compared, with the objective of designing an imaging-system experiment for students in an undergraduate optics laboratory. With the goal of characterizing the resolution of a typical digit...
作者:J. Pantaleone
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.414-421AAPT
摘要: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 ...
作者:V. N. Glazkov
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.473-477AAPT
摘要:The Wiedemann-Franz law, a prediction of the electronic theory of electrical and thermal conduction in metals, states that the Lorenz number L = κ / σT , where κ , σ , and T are the thermal conductivity, electrical conductivity, and absolute temperature, respectively, is a u...
作者:Benedikt W. Harrer
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.454-460AAPT
摘要:This article explores the origins of metaphorical language to describe energy by reviewing the historical development of the concept by physicists since the early 19th century. In addition to examples of historical and contemporary use of metaphors in academic writing, obser...
作者:Riccardo Antonelli
来源:[J].American Journal of Physics(IF 0.782), 2017, Vol.85 (6), pp.469-472AAPT
摘要:We consider the relativistic generalization of the problem of the “least uncomfortable” linear trajectory from point A to point B. The traditional problem minimizes the time-integrated squared acceleration (termed the “discomfort”), and there is a universal solution for...

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