$17\mathrm{.}26$ A small, fast boat has a specific resistance ratio of $0\mathrm{.}06($see Table $17\mathrm{.}2)$ and displaces $125$ long tons. Compute the total ship resistance and the power required to overcome drag when it is moving at $50f\frac{t}{s}$ in seawater at $77\_$F$.$

$\frac{p_1}{}+\frac{v_1^2}{2g}=\frac{p_5}{}$

Solving for $p_s,$ we get

$p_3=p_1+\frac{v_1^2}{2}g$

Because $=\frac{}{g},$ we have

$p_s=p_1+\frac{v_1^2}{2}$

FIGURE $17\mathrm{.}2$ Sphere in a fluid stream showing the stagnation point on the front surface and the turbulent wake behind.