HELP What is the consequence of atoms being a singular closed system?

Atoms of a certain element contain a fixed amount of energy.

Atoms of a certain element can’t be altered by outside forces.

Atoms don’t interact with each other in any way.

Atoms decompose slowly over time as they lose energy.

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)

Calculate the velocity of a car traveling in a straight path due east with a distance of 16 meters in 2 seconds. question 1 options: a)32 m/s b)32 m/s e c) 8 m/s e d) 8 m/s

What are the dimensions of the cross section that passes through the points a, f, g, and d?