Prairie dogs are burrowing rodents. they do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. the animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air (rho = 1.29 kg/m^3) blows past the openings at different speeds, as the drawing indicates. (va = 7.2 m/s, and vb = 1.3 m/s.)

required:
assuming that the openings are at the same vertical level, find the difference in air pressure between the openings and indicate which way the air circulates.