A 4-m-long quarter-circlular heavy gate of radius 3 m is hinged about its upper edge A, as shown in the figure. The gate controls the flow of water over the ledge at B. Determine a) the hydrostatic force FR on the gate and b) the minimum weight of the gate required to keep the gate closed when the water level is at the upper edge of the gate, A. You may assume the gate has a zero thickness when calculating the moment. Given g = 9.8 m/s². Recall the hydrostatic forces and center of pressure are given by

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
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Chapter8: Centroids And Distributed Loads
Section: Chapter Questions
Problem 8.122P: The 12-ft wide quarter-circular gate AB is hinged at A. Determine the contact force between the gate...
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A 4-m-long quarter-circlular heavy gate of radius 3 m is hinged about its upper edge A,
as shown in the figure. The gate controls the flow of water over the ledge at B. Determine a) the
hydrostatic force FR on the gate and b) the minimum weight of the gate required to keep the
gate closed when the water level is at the upper edge of the gate, A. You may assume the gate
has a zero thickness when calculating the moment. Given g = 9.8 m/s². Recall the hydrostatic
forces and center of pressure are given by
uit JuIuLt unu uit ui cu n vi uR JuIIut unu 13 a u w
FR = (Po+ pghc)A = PcA = PaveA
| 3 m
ab12
Yp = s ++
2 (s + b/2 + PoMpg sin 0)]ab
4m
B
62
2 12(s + b/2 + PoMeg sin 0)]
The moment of a force F about A is equal to F
times the distance from A to the line of action of F. Also,
recall that the hydrostatic force passes thru the center of the
circle.
DI
Transcribed Image Text:A 4-m-long quarter-circlular heavy gate of radius 3 m is hinged about its upper edge A, as shown in the figure. The gate controls the flow of water over the ledge at B. Determine a) the hydrostatic force FR on the gate and b) the minimum weight of the gate required to keep the gate closed when the water level is at the upper edge of the gate, A. You may assume the gate has a zero thickness when calculating the moment. Given g = 9.8 m/s². Recall the hydrostatic forces and center of pressure are given by uit JuIuLt unu uit ui cu n vi uR JuIIut unu 13 a u w FR = (Po+ pghc)A = PcA = PaveA | 3 m ab12 Yp = s ++ 2 (s + b/2 + PoMpg sin 0)]ab 4m B 62 2 12(s + b/2 + PoMeg sin 0)] The moment of a force F about A is equal to F times the distance from A to the line of action of F. Also, recall that the hydrostatic force passes thru the center of the circle. DI
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