# Torque on a Dam

Water exerts a force on the dam. It also exerts a torque about the axis passing through O in the figure. The net force the water exerts on the dam can be modeled to act at a height $$\frac{a}{b}H$$ above O (So the torque exerted by the water is $$\frac{a}{b}FH$$). What is $$a+b$$?

You can neglect the atmospheric pressure as it acts on both sides of the dam

This Problem is taken from Physics for Scientists and Engineers with Modern Physics

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