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Question: Water is flowing in a tube of non-uniform radius. The ratio of the radii at entrance and exit ends o...

Water is flowing in a tube of non-uniform radius. The ratio of the radii at entrance and exit ends of the tube is 3:2. The ratio of the velocities of water entering in and exiting from the tube will be –

A

8 : 27

B

4 : 9

C

1:1

D

3 : 2

Answer

4 : 9

Explanation

Solution

a1 v1 = a2 v2

(p r12\mathrm { r } _ { 1 } ^ { 2 }) v1 = (p ) v2

r22r12\frac { \mathrm { r } _ { 2 } ^ { 2 } } { \mathrm { r } _ { 1 } ^ { 2 } } = 49\frac { 4 } { 9 }