$($a$)$ Calculate the absolute pressure at the bottom of a fresh$-$water lake at a depth of $25\mathrm{.}8$ m $.$ Assume the density of the water is $1\mathrm{.}00{10}^{3}k\frac{g}{m^3}$ and the air above is at a pressure of $101\mathrm{.}3$ kPa $.$

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$($b$)$ What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of $34\mathrm{.}0$ cm $?$

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