What is the work of a polytropic (n = 1.21) compression of air (cp/cv = 1.40) in a system with moving boundary from p1 = 15 psia, v1 = 1.0 ft³ to p2 = 150 psia, v2 = 0.15 ft³?
a) 135.5 ft-lbf
b) 201.4 ft-lbf
c) 312.6 ft-lbf
d) 428.3 ft-lbf