Consider a system to be two train cars traveling toward each other. What is the total momentum of the system before the train cars collide?

What properties of a moving object are used in determining the object's energy of motion

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)