[Sigma]wy dA tan [theta]·y = w tan [theta] [Sigma] y² dA
= w tan [theta]·Ak² ft. tons, (4)
w denoting the density of water in tons/ft.³, and W = wV, for a
displacement of V ft.³
This couple, combined with the original buoyancy W through B, is
equivalent to the new buoyancy through B, so that