What is the generic name for a cyclical device that transforms heat energy into work?.

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

The material that keeps its new shape after it is stretched is called?

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.