A long, solid cylinder of radius 2 ft hinged at point A is used as an automatic gate, as shown
in the figure. When the water level reaches 15 ft, the cylindrical gate opens by turning about the
hinge at point A. Determine
(a) The hydrostatic force, in lbf, acting on the cylinder and its line of action when the gate
opens and
(b) The weight, in lbf, of the cylinder per ft length of the cylinder.
radius of sphere is =2 ft, Water level=15 ft, density= 62.4 lbs/ft3
Horizontal force= lb-ft/s²
Now, vertical force = lb-ft/s2
Net force on sphere= lb-ft/s2
(b) Weight of fluid=mg=
Weight = 1726.58 lbf
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