摘要:

A uniform rectangular plate is arranged so that it oscillates in its own plane around either one of two axes, one at the center of each edge. The analysis shows that there is a particular ratio of the lengths of the two sides (in addition to unity) for which the two periods are equal, and still another ratio giving the minimum period. These computations check satisfactorily by experiment.

ISSN:0002-9505    

DOI:10.1119/1.1933666

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

The usual expressions for the vector sum, scalar product, and vector product of two vectors are derived from postulated properties having direct physical significance.

ISSN:0002-9505    

DOI:10.1119/1.1933667

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933668

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

After a brief account of the development of special courses in physics for premedical and predental and for other nonengineering groups of students, and of the growing need for such courses, suggestions are made as to the types of students to be admitted, suitable textbooks, and sources of illustrative material. The relatively minor changes needed in the laboratory work are pointed out. Evidence that medical schools strongly endorse such courses is included.

ISSN:0002-9505    

DOI:10.1119/1.1933669

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

The specification of the state of polarization of beams of radiation by Stokes parameters is discussed. Mueller's method of regarding the Stokes parameters as column matrices and optical devices as represented by 4×4 matrices is described and examples of the procedure are given. The relation of the Stokes parameters to the Poincaré sphere representation is shown.

ISSN:0002-9505    

DOI:10.1119/1.1933670

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933671

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

An experimental arrangement for balancing a ball upon a jet of steam is described in the treatise onPneumaticswritten by Heron of Alexandria probably in the first century A.D. It is here reproduced.

ISSN:0002-9505    

DOI:10.1119/1.1933672

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

The Michelson Museum, located in the Michelson Laboratory, U. S. Naval Ordnance Test Station, Inyokern, China Lake, California, contains Michelson's early research apparatus, original manuscripts and research notes, reprints of published research papers, photographs, the Michelson medals, and the parchment announcing the late Dr. A. A. Michelson as the recipient of the 1907 Nobel Award in Physics. This paper contains a brief description of the items on display, one of Michelson's favorite portraits, and photographs of the Michelson medal case and the Museum.

ISSN:0002-9505    

DOI:10.1119/1.1933673

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

The theorem of Carathéodory is proved by showing that the necessary and sufficient condition for the existence of points neighboring to an arbitrary point which are inaccessible from the latter along solution curves of a linear total differential equation is that the conditions of integrability of the equation be satisfied.

ISSN:0002-9505    

DOI:10.1119/1.1933675

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

A survey of 35 companies employing physicists shows that the majority is willing to employ women on equal terms with men. The major objection voiced is that their professional career is, in general, for a much shorter period than that of men in equivalent positions.

ISSN:0002-9505    

DOI:10.1119/1.1933676

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP