In order for work to be done, what must happen?
A. The object must have potential energy, but it
does not need to move.
B. The mass of the object must be too great for
the force to be able to move it.
C. The force must move the object a distance.
D. The weight of the object must be too heavy for
an opposing force to move it.
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Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.