Explains using exponential mathematics, the effect of growth on rate of consuming energy resources. Concludes that we are running out of energy resources at a greater rate than many people think. Lists few options left such as conservation by stopping growth of consumption, recycling, and research to develop alternate sources. (GA)

Derives a formula for the number of years a given resource will last as a function of constant yearly growth rates in the resource usage. Suggests such a calculation to account for environmental problems. (CC)

The diffraction bands caused by a thin transparent plate of glass inserted over half the field in a spectrometer are discussed. (TS)

Describes an experiment to measure the effect of air resistance on falling balls suitable for use in undergraduate physics courses. (PR)

Reviews perspectives on student resources for learning with an emphasis on the practical benefits to be gained for instruction. Explains that physics education research has focused almost exclusively on student difficulties and misconceptions. This work is limited in what it can tell about student knowledge and learning. (Author/MM)

This sport can be usefully examined in an introductory mechanics course. The concepts of energy, momentum, acceleration, velocity, torque, and power are all involved in the analysis of the problem. High interest among the students usually results in increased understanding of the physical principles involved. (Author/DF)