$7-40$ Refrigerant$-134$a is expanded isentropically from $600$ kPa and $70C$ at the inlet of a steady$-$flow turbine to $100$ kPa at the outlet. The outlet area is $1m^2,$ and the inlet area is $0\mathrm{.}5m^2.$ Calculate the inlet and outlet velocities when the mass flow rate is $0\mathrm{.}75k\frac{g}{s}.$ Answers: $0\mathrm{.}0646\frac{m}{s},0\mathrm{.}171\frac{m}{s}$