Provides analytical and experimental comparisons of calculations in which the vertical trajectory of a model rocket is determined. (CP)

Reports on a method of determining the coefficient of friction of an object through the use of a record turntable. (CP)

Describes the experimental procedure used in determining the lifetime of tantalum-181. (CP)

Discusses recent advances in polarization techniques, specifically those dealing with polarization of atomic nuclei, and how polarized beams and targets are produced. These techniques have greatly increased the scope of possible studies, and provided the tools for testing fundamental symmetries and the spin dependence of nuclear forces. (GA)

Explains the principle behind a novel wind-driven water craft and shows that the basic laws of mass, energy and momentum conservation apply to it. An expression for calculating the final speed of the craft is given (GA)

Describes a simple recursive method for calculating the partition function and average energy of a system consisting of N electrons and L energy levels. Also, presents an efficient APL computer program to utilize the recursion relation. (Author/GA)

Shows that when positions annihilate in solid materials the energy distribution of the annihilation gamma rays is much broader than that of a 0.511-Mev gamma peak. This broadening is caused by the momentum distribution of the electrons in the material. (Author/GA)

Experiments to measure range, range straggling, stopping power, and energy straggling of alpha particles are discussed in this article. Commercially available equipment with simple modifications is used for these measurements. (Author/GA)

The energy levels of the free field, Coulomb potential, and the three-dimensional harmonic oscillator are found using the Dirac operator formalism by the construction of suitable ladder operators. The degeneracy of each level is also discussed. (Author/GA)

Describes the construction of an apparatus for demonstrating the center of percussion and pivot point of a ball being struck. (MLH)

Proposes practical problems involving the dynamics of rocket and orbital problems for the secondary level physics class. (SL)

Describes experiments in the measurement of resonances in a nuclear reaction and the measurement of elastic scattering cross section. (SL)

Advocates changing the role of secondary school science from one of theory verification and problem solving to the formulation and acceptance of hypotheses for observed phenomena. Provides an example of the procedure using Hooke's Law. (CP)

Reviews the fundamentals of the equation of motion for the bicycle. (SL)

Describes apparatus for demonstrating magnetic lines of force, plastic discharge tubes, minimum angle of deviation of light passing through a prism, light scattering, and measuring high voltage. (SL)