Ch6_Momentum Principle

# The discharge in the jet is 04 m 3 s the pressure in

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plate that is normal to the axis of the jet. The discharge in the jet is 0.4 m 3 /s. The pressure in the tank at point A is 75 kPa. Find: Horizontal force to hold plate in position . T=15 o C Q=0.4 m 3 /s p A =75 kPa B

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7 Problem 6.09 70

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9 Example: Like Textbook Problem 6.17 Determine the external reactions in the x and y directions needed to hold this fixed vane, which turns the oil jet in a horizontal plane. Here, v 1 = 28 m/s, v 2 = 27 m/s, and Q = 0.20 m 3 /s.

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10 Example: Like Textbook Problem 6.34 Given: The pipe has a 180 o horizontal bend in it as shown, and D = 30 cm. The discharge of water in the pipe and bend = 0.60 m 3 /s, and the pressure in the pipe and bend= 100 kPa gage. The bend volume = 0.10 m 3 and the bend itself weighs 500 N. Find: Force applied to flanges to hold pipe in place D=30 cm Q=0.60 m 3 /s P=100 kPa, gage Vol=0.10 m 3 W=500 N p 1 A 1 p 2 A 2 V 1 V 2 F x F y W b +W f x y
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12 Example: Textbook Problem 6.57 Given: This spray head discharges water at a rate of 3 ft3/s. The efflux speed = 65 ft/s in the free jet. The flow is irrotational. Find : Force acting through the bolts of the flange needed to keep the spray head on the 6 inch pipe. Neglect gravitational forces.
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14 Sluice Gate Find: Force due to pressure on face of gate Assume: v 1 and v 2 are uniform (pressure is hydrostatic)
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