Problem $2\mathrm{.}3\mathrm{.}17$

$($a$)$ Determine the chnee in hydrostatic pressure in a giraffe's head as it lowers its head from eating leaves $6m$ above the ground to getting a drink of water at ground level as shown in Fig. P$2\mathrm{.}3\mathrm{.}17.$ Assume the specific gravity of blood is $SG=1.($b$)$ Compare the pressure change calculated in part $($a$)$ to the normal $120mm$ of mercury pressure in a human's heart.