Problem $4$

$3\mathrm{.}28$ A $40-mph$ wind blowing past your house speeds up as

it flows up and over the roof. If elevation effects are negligible,

determine $($a$)$ the pressure at the point on the roof where the

speed is $60$ mph if the pressure in the free stream blowing to$-$

ward your house is $14\mathrm{.}7$ psia $.$ Would this effect tend to push

the roof down against the house, or would it tend to lift the

roof? $($b$)$ Determine the pressure on a window facing the wind

if the window is assumed to be a stagnation point.

The Bernoulli equation gives