9) A 15-cm radius air duct is used to replenish the air of a room 9.2 m x 5.0 m
ID: 1285778 • Letter: 9
Question
9) A 15-cm radius air duct is used to replenish the air of a room 9.2 m x 5.0 m x 4.5 m every 16 minutes. How fast does air flow in the duct?
10) Water moves through a constricted pipe in steady, ideal flow. At the lower point shown below, the pressure P1 = 1.75 x 104 Pa and the pipe diameter is 6.00 cm. At another point 0.250 m higher, the pressure is P2 = 1.20 x 104 Pa and the pipe diameter is 3.00 cm. Find the speed of flow (a) in the lower section and (b) in the upper section. (c) Find the volume flow rate through the pipe.
Explanation / Answer
9.
Area of duct = (pi R^2), = .15m.^2 x pi, = .0707m^2.
Volume of room = (9.2 x 5 x 4.5) = 207m^2.
Volume of air to enter via duct in 1 sec. = (207/(16 x 60), = .215625m^3.
(.215625/ .0707) = 3.05m/sec.
which is the velocity of the air.
in 300 points i can do 1st part.....also question no.10 does not contain diagram.
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