Note: $($ PLEASE USE SPECIFIC HEATS$)***********$

An engine executing a dual cycle has a compression ratio of $18$ and a cut$-$off ratio

of $1\mathrm{.}1.$ The pressure ratio during constant$-$volume heat addition process is $1\mathrm{.}1.$ At

the beginning of the compression, $P_1=90$kPa,$T_1=17C,$ and $V_1=0\mathrm{.}003m^3.$

Determine the net power produced by this engine using variable specific heats.