The mechanics portion of the PSSC course is taught using man-sized" carts and equipment. The students ride and propel the equipment themselves thereby experiencing the forces and acceleration involved. The experiments are carried out in the school gymnasium. (TS)

Cohesion and gravitational force are given as the mechanisms by which the siphon works. Hydrostatic theories and experimental results are given to support this conclusion. (TS)

Proposes a method of collecting solar energy by using available plastics for Fresnel lenses to focus heat onto a converter where thermal dissociation of water would produce hydrogen. The hydrogen would be used as an efficient non-polluting fuel. Cost estimates are included. (AL)

Reports the instructor's experiences with open-end introductory physics laboratories. Students' reactions to the course are summarized. Organizational details and changes in the organization made for 1969-70 are also included. Bibliography. (LC)

Describes how the Joule-Thomson porous plug experiment may be used to illustrate the usefulness of the enthalpy function, irreversibility, steady-state ideas, and a relativity principle inherent in Newtonian mechanics. Bibliography. (LC)

A discussion of the possible existence of tachyons, particles that travel faster than light, and their theoretical properties. Suggests that if tachyons were found, the consequences for relativity theory, quantum mechanics and the concept of casuality would be far-reaching. Concludes that the final answer rests with the experimentalist.…