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Unformatted text preview: 4 Forces on Plane Submerged Objects 9/2/2010 5 9/2/2010 6 Where does the force act? The moment of the resultant force must be equal to the moment of the distributed force 9/2/2010 7 Second moment of areas for shapes are given in handbooks but they are given about the centroid so we need to reexpress in terms of the centroid using the parallel axis theorem. 9/2/2010 8 Example Gate is 5ft wide, rectangular cross section Back of gate is open to atmosphere Find F r Force of wall on gate Resultant force on hinge 9/2/2010 9 15 ft g=64 lbf/ft 3 10 ft 6 ft P 9/2/2010 10 9/2/2010 11 Example A rectangular gate is 1.8m wide and 2.0m long. Neglecting the friction in the hinge find the weight of the gate required to keep the gate close if the water reaches 2.0 m above the hinge. 9/2/2010 12 water 2m 2.0m 4 3 hinge 9/2/2010 13 9/2/2010 14 9/2/2010 15...
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This note was uploaded on 09/30/2010 for the course FLUIDS ES 340 taught by Professor Bohl during the Fall '10 term at Clarkson University .
 Fall '10
 Bohl

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