$19\mathrm{.}1$ An air$-$standard Otto cycle has a compression ratio of $9.$ At

the beginning of compression, $p_1=100$kPa and $T_1=300K.$

The heat addition per unit mass of air is $1350k\frac{J}{k}g.$

$9\mathrm{.}2$ 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.

Solve $9\mathrm{.}2$ only,

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

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

not $9\mathrm{.}1!$

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