Carbon dioxide flows in a 50-mm-diameter pipe at a velocity of 1.5 m/s, temperature 66 C, and absolute pressure 50 kPa. (a) Is the flow laminar or turbulent? (b) If the temperature is lowered to 30 C, what is the flow regime? (c) If the pressure is reduced to 20 kPa, what is the flow regime? Assume the viscosity of CO₂ is constant, 1.4710^-5 kg/ms. (d) Explain the differences in answers in terms of the physical mechanisms involved