Air flows steadily through a long straight section of pipe with circular cross section and constant diameter of 6 cm. At the inlet, the temperature is 410 K the pressure is 240 kPa and the mass flow rate is 0.35 kg/s. At the outlet, the temperature is 235 K and the pressure is 80 kPa. (a) Calculate the inlet and outlet velocities. (b) Find the total frictional force (N) exerted by the pipe wall on the flow.

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