The following four $(4)$ problems apply to a four$-$stroke, six$-$cylinder spark ignition engine being modeled as an

ideal Otto Cycle. The properties at the four state points in the cycle corresponding to the P$-$v diagram are shown

below. The engine operates at $3000$rpm$.$ Furthermore, each cylinder contains $0\mathrm{.}0015$lbm of air.

Please solve skills $50$ and $51.$

Skill $50$: Calculate the net thermal efficiency of this engine for the conditions given in the problem.

Skill $51$: Calculate the net power output $[$hp$]$ of this engine for the conditions given in the problem.