1.A hurricane wind blows across a 7.8 m x 12 m flat roof at a speed of 180 km/hr. What is the pressure difference? How much force is exerted on the roof? 2. Relevant equations P= p_atmos + pgd P=F/A 3. The attempt at a solution p = 101300Pa - (1.3)(9.8m/s^2)(93.6m^2) p = 100107.5Pa 100107.5Pa = F/(93.6m^2)^2 F = 8.8 * 10^8 N I know this is wrong, how do I go about solving this problem?