An 90 g aluminum calorimeter contains 390 g of water at an equilibrium temperature of 200C. A 160 g piece of metal, intially at 3050 C, is added to the calorimeter. The final temperature at equilibrium is 320 C. Assume there is no external heat exchange. The specific heat capacities of aluminum and water are 910 and 4190 J/kg. K, respectively. The specific heat capacity of the metal is closest to:

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.