please answer the three questions provided.

Steam enters a 4.4-cm-diameter pipe at 80 bar and 600∘600^{\circ}600∘C
with a velocity of 150 m/s. Determine the mass flow rate, in kg/s.
refrigerator 134a enters the evaporator of a refrigerator at a steady state at -16 deg C and quality of 20% at 8m /sec. the evaporator flow channel has a constant diameter of 1.7 cm. Determine the mass flow rate of refrigerator in Kg/sec.
The application of the first law and the mass-balance equation to this problem proceeds in almost exactly the same way as in the first problem. The only difference is...