Problem $9\mathrm{.}122$

The concrete "gravity" dam is held in place by its own weight $($Figure $1).$ The density of concrete is ${}_c=2\mathrm{.}5M\frac{g}{m^3},$ and water has a density of ${}_w=1\mathrm{.}0M\frac{g}{m^3}.$ Suppose that $a=2m,h=5m.$

Part A

Determine the smallest dimension $d$ that will prevent the dam from overturning about its end $A.$

Express your answer to three significant figures and include the appropriate units.

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$1$ of $1$

Third time posting same question, answer is not $2\mathrm{.}46$m$.$ Please solve correctly!