What explains the fact that no machine is 100 percent efficient? a. friction transforms mechanical energy into thermal energy. b. thermal energy is transformed into mechanical energy by friction. c. potential energy can be transformed into kinetic energy. d. kinetic energy can be converted into mechanical energy.

Movement that is like a t a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. transfers energy from one location to another a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave