Abody completes 20 revolution in 5sec calculate time period and frequency.

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.