The experimental ground$-$effect machine has a total mass of $2\mathrm{.}2$ Mg $.$ It pumps air at atmospheric pressure through the circular intake duct B of $1$ m radius, and discharges horizontally below the skirt C of radius $3$ m $.$ For an intake velocity of $45\frac{m}{s},$ calculate the average air pressure $p$ under the $6$ m diameter machine. Density of air is $1\mathrm{.}206k\frac{g}{m^3}$ Ans: $p=1034\mathrm{.}68\frac{N}{m^2}$