Chapter 9, Problem 101P

A tank partially filled with water and pressurized to 6.8 psig has a circular gate in the side, 0.6 ft in diameter with an area of 0.283 ft2, hinged at the top. The top of the gate is 0.6 ft from the surface of the water. The center of pressure is 0.2 in below the centroid. The magnitude of the hydrostatic resultant force on the gate is 15.9 lbf. Local atmospheric pressure on the outside of the tank is 14.5 psia. What torque in ft-lbf is required at the hinge to keep the gate closed?

8.122 The 12-ft wide quarter-circular gate AB is hinged at A. Determine the contact force between the gate and the smooth surface at B due to water pressure acting on the gate. Use y- 62.4 Ibvn for water.

A cylindrical tank of 1.5 m diameter and height 0,75 m has a hemispherical dome. The tank contains oil of relative density 0.84. The dame is joined to cylinder position by four equally spaced bolts. If pressure gauge at point M, 0.3 m above base of tank read 50 kPa. Determine force each bolt.