$4-$ The engine operating at the condition in problem $3$ is square, Calculate:

a$)$ Specific power ia $k\frac{W}{c}{m}^2.$

b$)$ Output per displacement in $k\frac{W}{c}{m}^3.$

c$)$ Specific volume $c\frac{m^3}{k}W.$

d$)$ Power lost to friction in $kW.$