2. Air flows from left to right through a duct with a constriction in the middle as shown below. Here the cross-sectional area of the duct A1 = 0.05 m², the cross-sectional area of the constriction A2...

Extracted text: 2. Air flows from left to right through a duct with a constriction in the middle as shown below. Here the cross-sectional area of the duct A1 = 0.05 m², the cross-sectional area of the constriction A2 = 0.5A1, the air velocity V1 = 20 m s-1 and the density of air is 1.2 kg m-3. Point #1 Point #2 Point #3 A1 A2 A1 Determine the mass flow rate of air at Points #2 and #3 and the velocity at Point #2.