A closed system consisting of 10 pound-mass of air undergoes a polytropic process from 65 psi and 4 cubic feet per pound-mass to a final state where 20 psi and 11 cubic feet per pound-mass. Determine the boundary work in Btu

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.