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Water at 20°C flows through the elbow (see figure below) and exits to the atmosphere. The pipe diameter is D1 = 10 cm, while D2 = 3 cm. At a weight flow rate of 150 N/s, the pressure p1 = 2.3 atm (gage). Neglecting the weight of water and elbow, estimate the force on the flange bolts at section 1.
Please explain clearly and don't skip steps, thank you very much.