physics
posted by Sean .
1. Air flowing through a vent pipe of crosssectional area 21[m^2] is traveling 0.89[ms^1].
What is the flowrate?
[18.7 m3s1]
Answer with three significant figures (don't forget to round!) or N/A if there is not enough information to answer the question.
2. Before the vent pipe (in problem 1) ejects the air, the pipe becomes smaller in crosssectional area. The new crosssectional area is 17[m2]. What is the new velocity?
[ms1]
Answer with three significant figures (don't forget to round!) or N/A if there is not enough information to answer the question.
I don't understand number 2

physics 
Elena
1.
Flowrate=A•v=21•0.89 = 18.69 m³/s
2.
A₁v₁=A₂v₂
v₂=A₁v₁/A₂=21•0.89/17=1.1 m/s
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