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Question: Water is flowing through a tube of non uniform cross section. If the radii of the tube at the entran...

Water is flowing through a tube of non uniform cross section. If the radii of the tube at the entrance and exit are in the ratio 3 : 2, then the ratio of velocity of liquid entering and leaving the tube is-

A

1 : 1

B

4 : 9

C

9 : 4

D

8 : 27

Answer

4 : 9

Explanation

Solution

By equation of continuity

A1v1 = A2v2 ̃ =

̃ 49\frac { 4 } { 9 }