A 5-m·diameter spherical tank is filled with liquid oxygen (p = 1141 kg/m cp =1.71 kJ/kg-°C) at - 184°C. It is observed that the temperature of oxygen increases to – 183°C in a 144–hour period. The average rate of heat transfer to the tank is (a) 124W (b) 185 W (c) 246 W (d) 348 W (e) 421 W

1 kg of oxygen is heated from 20 to 120°C. Determine the amount of heat transfer required when this is done during a (a) constant-volume process and (b) isobaric process.

A piston-cylinder device initially contains 1.4 kg sat- urated liquid water at 200°C. Now heat is transferred to the water until the volume quadruples and the cylinder contains saturated vapor only. Determine (a) the volume of the cylin- der, (b) the final temperature and pressure, and (c) the internal energy change of the water. Water 1.4 kg 200°C

Determine the specific volume of R-134a at 50°C and 1000 kPa in m3/kg.  Include 4 significant figures (5 decimal places) in your answer.