During each cycle of operation a refrigerator absorbs 56 cal from the freezer compartment and expels 81 cal tothe room. if one cycle occurs every 10 s, how many minutes will it take to freeze 570 g of water, initially at 0°c? (lv = 80 cal/g

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.