Air at 18C flows isothermally through a 300-mm-diameter pipe at a flow rate of 0.450 kN/s. The pipe is “smooth.” If the pressure at one section is 550 kPa, find the pressure at a section 200 m downstream. At one point on a streamline in an isentropic airflow, the velocity, pressure, and unit weight are 30.5 m/s, 350 kPa (absolute), and 0.028 kN/m 3 , respectively. Find the pressure at a second point on the streamline, where the velocity is 150 m/s.
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