Refutes the Doppler effect as the explanation of large red shifts in the spectra of distant galaxies and explains the relativistic effects in which the light sources approach the observer obliquely. Provides several diagrams and graphs. (YP)

Demonstrates a method of measuring the acceleration due to gravity. Provides an illustration of the apparatus and the data analysis. Suggests four different variations of this experiment. (YP)

Reviews the computer software, "Science Toolkit," made by Broderbund Software. The software covers experiments on light, temperature, timing, motion, speed, and frequency by using interfacing equipment. Provides an evaluation and four typical monitor displays. Concludes that it is an excellent software package. (YP)

Presented is a simple demonstration of siphon action by using straws without sucking, or filling and closing one end. Includes the method, figures of the demonstration, and four questions for students on the demonstration. (YP)

Presents an apparatus, a solid-state sound generator in a plastic ball. Includes pictures of the ball and a diagram of the piezo horn. (YP)

Shows how a baseball having a built-in clock can be used for measuring ceiling height. Suggests other questions to investigate. (YP)

Outlines a method to write multiple (four) versions of each examination. Reviews some advantages and disadvantages of multiple-choice and open-ended problems. Considers the writing and grading techniques used. Reports that the examination met the consistency requirement and received a good evaluation from students. (YP)

Reports carbon dioxide and other trace gases can be the cause of the Greenhouse Effect. Discusses some effects of the temperature change and suggests some solutions. Included are several diagrams, graphs, and a table. (YP)

Develops a pair of equations for calculating the elevation and azimuth angles for the various satellites. Uses 3-dimensional vector difference calculations. Provides a practical example, figures, and table. (YP)

Describes a strategy for using computer technology to save time when checking the data and calculations of students. Provides information regarding software and hardware used. (YP)

Should a prism be centered to measure the apex angle and refraction index? Concludes that centering the prism is not critical, and that there is an interval for which the prism can be displaced. (YP)

Describes a circuit by which capacitance and the dielectric constant can be measured. Shows the circuit diagram and the method to calculate these constants. (YP)

Described is a microcomputer with two detection systems to enable three variables of the puck's motion to be recorded simultaneously: speed, radius of the orbit, and the ongoing time of measurement. Presented are the experimental setup, a discussion of the computer program, and results. (YP)

Introduces a bubble-making method for discussion about surface tension and thin film interference. Provides some pictures and list of materials for the apparatus. (YP)

Examines preconceptions regarding several implicit vector characteristics that 15- to 17-year-old students possess just before taking their first physics course. Shows seven vector characteristics and three tasks for interviewing students. Presents the most common student preconceptions regarding each of the implicit vector characteristics. (YP)