A 140litre container is to be used to store heat for a domesticheating system. There are two options for the storage material,lead blocks or clay bricks. Using the data provided determine whichis the best option for thesystem.                                                       Â
Lead: specific heat 130J/kgK, density 11340kg/m3
Brick: specific heat 840kJ/kgK, density 2000kg/m3
2. A container holds 0.25m3 of compressed airat 900kPa and 20°C. This is expanded polytropically via a processwith n=1.3 to a pressure of 150kPa. Determine;       Â
(2 marks each)
- The mass of air
- The final air temperature
- The work transfer, stating if it is input or output work
- The change in internal energy
- The heat transfer , stating if this is heat input oroutput
please answer both the questions/
