Water stands at a depth h behind the vertical face of a dam. If exerts a resultant horizontal force on the dam tending to slide it along its foundation and a torque tending to overturn the dam about the point O. Find :
(a) horizontal force,
(b) torque about O,
(c) the height at which the resultant force would have to act to produce the same torque, l = cross-sectional length and ρ = density of water.
