$9\mathrm{.}2$ Solve Problem $9\mathrm{.}1$ on a cold air$-$standard basis with specific

heats evaluated at $300$ K $.$

$($a$)$ the net work, in kJ per kg of air.

$($b$)$ the thermal efficiency of the cycle.

$($c$)$ the mean effective pressure, in kPa $.$

$($d$)$ the maximum temperature in the cycle, in K $.$