Air discharges downward in a pipe and then outward between the parallel disks. Assuming negligible density change in the air, derive a formula for the acceleration of air at point A, which is a distance r from the center of the disks. Express the acceleration in terms of the constant air discharge Q, the radial distance r, and the disk spacing h. If D= 10 cm, h=.6 cm and Q=0.380 m^3/s, what are the velocity In the pipe and the acceleration at point A where r =20 cm?