1. The problem statement, all variables and given/known data A house has a roof with an area of 220 m2. Wind blows over the top with a speed of 10 m/s. The density of air is 1.29 kg/m2. The air inside the house is stagnant. Point A is just inside the roof, and point B is outside the roof at the same height. (a) What is the difference in pressure (PA - PB) between points A and B? (b) What force is applied to the roof by the inside air? 2. Relevant equations This is where I'm stuck at 3. The attempt at a solution I don't know what equations to apply here, they all involve mass, but that's not a given.