Two water reservoirs A and B are connected to each other through a 39-m-long, 2-cm-diameter cast iron pipe with a sharp-edged entrance. The pipe also involves a swing check valve and a fully open gate valve. The water level in both reservoirs is the same, but reservoir A is pressurized by compressed air while reservoir B is open to the atmosphere at 95 kPa. If the initial flow rate through the pipe is 1.5 L/s, determine the absolute air pressure on top of reservoir A. Take the water temperature to be 10°C. The density and dynamic viscosity of water at 10°C are rho = 999.7 kg/m3 and μ = 1.307 × 10–3 kg/m·s. The loss coefficient is KL = 0.5 for a sharp-edged entrance, KL = 2 for a swing check valve, KL = 0.2 for the fully open gate valve, and KL = 1 for the exit. The roughness of a cast iron pipe is ε = 0.00026 m.