$7-105.$ Steam at $1\mathrm{.}4$MPa,$350C$ enters a turbine operating at steady state with a

mass flow rate of $0\mathrm{.}12k\frac{g}{s}$ and exits at $100$kPa,$115C.$ Stray heat transfer and the

effects of motion and gravity can be ignored. Let $T_0=20C,p_0=100$kPa.

Determine for the turbine $($a$)$ the power developed and the rate of exergy destruction,

each in $k\frac{J}{s}$ and $($b$)$ the isentropic and the exergetic turbine efficiencies.