A closed, rigid tank fitted with a paddle wheel contains 0.1kgof air, initially at 300 K, 0.1MPa. The paddle wheel stirs the air for 20 minutes, with the power input varying with time according to W = -10t, where W is in watts and t is time, in minutes. The final temperature of the air is 1060K. Assuming ideal gas behaviour and no change in kinetic or potential energy, determine for the air
a) the final pressure, in MPa
b) the work, in kJ
c) the heat transfer, in kJ