ISSN:0002-9505    

DOI:10.1119/1.18762

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18766

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18769

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18768

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18767

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

摘要:

I’ll propose a physicist’s answer to Stanley Fish’s impudent question, and offer some thoughts about the role of text(book)s in the teaching and learning process. Also—with a view to offending as many listeners as possible—I will indulge in some gratuitous curmudgeonly remarks about the reform movement in physics education.

ISSN:0002-9505    

DOI:10.1119/1.18777

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

摘要:

The initial energy of a pendulum weakly coupled to a stretched string of infinite length dissipates into waves traveling away along the string. The frequency spectrum of this process emerges from a simple algebraic procedure resting on its key features. Confining the string to a long but finite length revives the pendular motion periodically. This model illustrates basic aspects of dissipation, providing material for exercises on physicomathematical techniques.

ISSN:0002-9505    

DOI:10.1119/1.18752

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

摘要:

The equations of motion that describe a skier descending a speed-skiing hill are solved both analytically and numerically. The model is shown to agree well with actual official results but only when the hill profile is considered. A sensitivity analysis reveals which parameters most affect the skier’s exit speed. Other factors, such as scaling effects and wind gusts, are included to determine whether these need to be considered in official results. One surprising result is that, under certain conditions and hill profiles, maximum skier speed is attained prior to entry into the timing zone—thus bringing into question the optimum placement of the timing gates.

ISSN:0002-9505    

DOI:10.1119/1.18753

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

摘要:

A path integral formalism is used to describe the propagation of photons through a transparent medium. It is shown that the reduced phase velocity of light can be understood quantitatively by taking into account the contribution of all the possible classical paths the photon could have taken in order to reach a detector. These paths include all the multiple scattering processes by the atoms in the medium.

ISSN:0002-9505    

DOI:10.1119/1.18754

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP

摘要:

The electric and magnetic forces acting on an ion in uniform crossed fields are shown to add to give a centripetal force of constant magnitude, moving with the ion in a cycloid trajectory. A comparison is made with the analogous forces in the classical brachistrochrone case of a bead sliding down a frictionless cycloid-shaped wire.

ISSN:0002-9505    

DOI:10.1119/1.18755

出版商:American Association of Physics Teachers    

年代:1997

数据来源: AIP