Question $2(25$ points$)$

Refrigerant $134$ a enters a horizontal pipe operating at steady state at $40C,300$kPa, and a mass flow rate of $0\mathrm{.}6k\frac{g}{s}.$ At the exit, the temperature is $50C$ and the pressure is $240$ kPa $.$ The pipe diameter is $0\mathrm{.}04$ m $.$ Determine $($a$)$ the velocities at the inlet and exit, in $\frac{m}{s},$ and $($b$)$ the rate of heat transfer between the pipe and its surroundings, in kW $.$