An open system starts with 52 J of mechanical energy. The energy changes to 45 J of mechanical energy and 2 J of thermal energy. What is the final total energy of the system? A. 9J B. 50 J C. 47 J D. 54 J

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?

J. j. thomson’s experiment disproved the theory that an atom

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?