Which of the following statements most accurately differentiates potential and kinetic energy? a. any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy. b. any object that has motion has potential energy, while any object not in motion but with the potential to do work has kinetic energy. c. gravitational potential energy is a form of mechanical energy, while kinetic energy is not. d. kinetic energy is a form of mechanical energy, while gravitational potential energy is not.

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

The motion of water in a dam serves human beings by generating electricity as it is a controlled motion. give one example for an uncontrolled motion. what effects could it cause