摘要:

An experiment is described which studies the dynamical behavior of a soft spring. This experiment has proved valuable as a project in a junior or senior physics laboratory. The results demonstrate the inadequacy of both the elementary formula for the period and the modified formula containing a correction term for the mass of the spring. A simple theoretical model is presented which yields results in agreement with experiment. The analysis uses mathematics that the students have been learning in parallel courses. The simplicity of the experiment serves to highlight the interplay of physics and mathematics. Most physics departments already have the elementary equipment needed.

ISSN:0002-9505    

DOI:10.1119/1.10956

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

摘要:

An elementary discussion of the gyroscope is presented. It is based on convservation of angular momentum and energy and does not require calculus. The results are identical with those obtained with the usual Lagrangian–Euler angle treatment. The motion is then analyzed graphically, and conditions under which the top falls are considered.

ISSN:0002-9505    

DOI:10.1119/1.10957

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

摘要:

By explicitly solving the Schrödinger equation for a particle encountering a linear potential hill (V = 0,x < 0;V = V0x/a, 0 < x < a;V = V0,x ≳ a), we obtain corrections to the quantum (a → 0) and classical (a → ∞) limits for the transmission coefficient, demonstrating the influence of the rangeaover which the potential rises.

ISSN:0002-9505    

DOI:10.1119/1.10958

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

摘要:

The advantages of using a d’Arsonval galvanometer to demonstrate forced, damped simple harmonic motion in a laboratory course are greatly enhanced if the deflection of the galvanometer can be recorded as a function of time. This is easily accomplished by modulating the radial magnetic field in which the galvanometer coil moves at a frequency too high to produce a response in the galvanometer. A signal proportional to the angular deflection of the coil is then induced in the coil, and may be amplified, rectified, and recorded. A few sample results obtained in this way are given.

ISSN:0002-9505    

DOI:10.1119/1.10959

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.10960

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.10961

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.10972

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.10705

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

摘要:

It is demonstrated that the halflife of232Th can be determined by dissolving a known amount of Th(NO3)4⋅4H2O in a liquid scintillator and using a difference method to obtain the counting rate due to and particles.(AIP)

ISSN:0002-9505    

DOI:10.1119/1.10706

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.10707

出版商:American Association of Physics Teachers    

年代:1977

数据来源: AIP