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A cylindrical air duct in an air conditioning system has a lengthof 5.5 m and a radius of 7.2 x 10^-2 m. A fan forces air ( n = 1.8x 10^-5 Pa·s) through the duct, such that the air in a room(volume = 280 m^3) is replenished every ten minutes. Determine the difference in pressure between the ends of the air duct.
a. 14 Pa
b. 1.1 Pa
c. 0.023 Pa
d. 4.4 Pa
e. 0.47 Pa

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